Chernobyl Accident - Simulation only (no talk)

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  • Опубликовано: 20 ноя 2024

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  • @Higgsinophysics
    @Higgsinophysics  Месяц назад +466

    Turn on caption or see: ruclips.net/video/P3oKNE72EzU/видео.html to understand this video.
    I don't use commercial sponsors. Let's keep it that way. Support here:
    Per video: www.patreon.com/Higgsino
    One time: ko-fi.com/higgsino

    • @Archangel657
      @Archangel657 Месяц назад +7

      Why don't you have the graphite moderator end caps on the underside of the control rods absence for most of the simulation?
      You should keep them on for the whole duration to make the simulation accurate while remaining simple.

    • @Chitose_
      @Chitose_ Месяц назад +1

      this simulation is plain awesome, even despite the tragedy responsible for the creation of this

    • @GrogorijF
      @GrogorijF Месяц назад

      Only Bruce Lee could solve this ping pong challenge.... Unfortunately he wasn't around....

    • @kiryukazuma6078
      @kiryukazuma6078 Месяц назад +2

      @@Archangel657 go make the video yourself then, stop complaining

    • @hansbrackhaus8017
      @hansbrackhaus8017 26 дней назад

      perhaps edit your subtitles to explain the lack of graphite rods at the beginning...

  • @ccrouzet
    @ccrouzet Месяц назад +12198

    2:40 : "the computer warns them to shut down immediatly, so they shut down the computer instead" 😭😭

    • @samuraijack6871
      @samuraijack6871 Месяц назад +1724

      Ain't no stupid ass computer telling me what to do 😂😂😂

    • @DonVigaDeFierro
      @DonVigaDeFierro Месяц назад +1212

      "warning!!! Shut down immediately!!!"
      "WHATEVER YOU SAY MR. COMPUTER!!!"

    • @DomTVdotTV
      @DomTVdotTV Месяц назад +331

      @@samuraijack6871"pfft that's for amateurs i know what i'm doin"

    • @ArtUniverse
      @ArtUniverse Месяц назад +508

      Soviet problem-solving at its finest.

    • @marshmallowbudgie
      @marshmallowbudgie Месяц назад +149

      Comrade Computer is your friend

  • @XD152awesomeness
    @XD152awesomeness Месяц назад +11298

    It really does demonstrate how quickly exponential functions get out of hand. It was all under control until it wasn’t

    • @Higgsinophysics
      @Higgsinophysics  Месяц назад +972

      You phrased that really well.. Yes it's so crazy!
      My computer agrees.
      Before the accident: 0.1 seconds render time per frame.
      During the accident: 10 minutes render time per frame lol.
      (My code is not the best, but still wow)

    • @jprobles4152
      @jprobles4152 Месяц назад +217

      only that they were never really in control. so much human error and violations with nuclear safety. the video also shows that the control rods are not used properly which is the biggest fcator of the failure.

    • @GustafUNL
      @GustafUNL Месяц назад +112

      @@jprobles4152 They were still in control, just not using their control wisely. And because they used their control foolishly, they lost their control.

    • @lambda653
      @lambda653 Месяц назад +67

      That reminds me of the common parable that's told about AGI safety. It's all under control because the AI is a lot more stupid than humans are, until it's not under control, and then you have an exponentially self improving intelligent agent that is fundamentally misaligned with humanity.

    • @huuuuuuuuuuuuuuuuuuuuuuuuuuuhn
      @huuuuuuuuuuuuuuuuuuuuuuuuuuuhn Месяц назад +28

      really terrifying if you think about how the entire planets fate depends on a couple of guys shoving or pulling regulation rods in and out of some reaction chamber

  • @sarahb.1602
    @sarahb.1602 Месяц назад +8599

    The last few seconds of this video are even more terrifying with no narration :D Wonderful.

    • @b.j.880
      @b.j.880 Месяц назад +225

      Holy crap yeah, the sudden cut off like a "you already know what happens next" type of deal.

    • @Legal_Sweetie333
      @Legal_Sweetie333 Месяц назад +14

      You people need to work on your vocabulary.

    • @Poloxamine-tg8dh
      @Poloxamine-tg8dh Месяц назад +136

      ​@@Legal_Sweetie333You know, not everyone on youtube isn't american.

    • @1080pol
      @1080pol Месяц назад +7

      It's like a fever dream

    • @quadro1493
      @quadro1493 Месяц назад +3

      It kinda sounds like a coffee machine, it's just a bit more dangerous and overkill to heat a cup of water

  • @StefanoMei
    @StefanoMei Месяц назад +4313

    The end actually freaked me out 😅

    • @ChaseThePinballWizard
      @ChaseThePinballWizard Месяц назад +66

      its so god damned loud thats why

    • @JackBond1234
      @JackBond1234 Месяц назад +129

      It's just the simulation. It was much more peaceful at the real power plant.

    • @ultimateearrapechannel31
      @ultimateearrapechannel31 Месяц назад +20

      @@JackBond1234 yeah sure...

    • @SeanVito
      @SeanVito Месяц назад +69

      ​@@JackBond1234yes radiation exposure is very peaceful until your body starts to just fall apart. Everyone was freaking out, they knew how horrifying this was.

    • @freakguitargod
      @freakguitargod Месяц назад +19

      5000+ rads will kill you in seconds, cant imagine how it would feel.

  • @MisterBigwolf
    @MisterBigwolf Месяц назад +6075

    After 3 minutes of exposure to the video, my face turned red and I started having headaches and vomiting.

    • @syrup_710
      @syrup_710 Месяц назад +241

      It's from the feed water I've seen worse you'll be fine

    • @jewiesnew3786
      @jewiesnew3786 Месяц назад +150

      Did you happen to taste metal?

    • @davidmendozamendez156
      @davidmendozamendez156 Месяц назад +58

      FALLOUT MENTIONED 🦅🦅🦅🦅🦅🦅🦅🦅🦅

    • @danielventura7310
      @danielventura7310 Месяц назад +30

      Dont worry. It means its time to go to bed

    • @ringspecies
      @ringspecies Месяц назад +90

      Three minutes? Not great, not terrible.

  • @r.b.ratieta6111
    @r.b.ratieta6111 Месяц назад +2542

    Aside from the ending, the part that really creeps me out is when all the control rods are pulled, because you can almost sense the engineers were kinda scratching their heads at that point like, "Hmmm. Why isn't it working as expected?" You can almost sense a debate going on between the engineers in the control room as the rods just linger there, with half of the group saying, "We need to stop NOW. This is NOT good. Sure, it doesn't look dangerous, yet, but who knows what will happen if we keep the reactor like this?" And the other half, or whoever was in charge (Dyatlov?), is basically saying, "It's not as bad as you think. Look, the reactor is still stable."
    Only when you start to see steam voids can you see the engineers saying, "Okay, okay, shut it down. Not worth it."
    They hit AZ-5, the control rods go down and -- wait they haven't gone all the way down. What is happeni--"
    *KABOOM!!*

    • @dstods
      @dstods Месяц назад +137

      There’s also the fact that the rods when fully withdrawn are not only less effective at neutron absorption but actually make the reactor more reactive at the beginning of being absorbed due to them displacing water on the way down.

    • @Maxikxng
      @Maxikxng Месяц назад +144

      ​@@dstodsnot only that in the end in the video, a few more moderator rods appeared,
      wich irl where about 2/3 of the controll rod lenght and attached below the controll rods for more efficency.
      but since they didnt reach the reactor bottom when the controll rods were fully pulled out, at the bottom a bunch of fast neutrons could accumilate and when the az-5 was pressed, the displacement moderator from the controll rods caused them all to slow down and rapidly react, creating tons of heat boiling ALL of the water in the reactor at once (wich was not boiling due to the running at low power as it was xenon poisones at the top) ,wich let to the multi ton reactor top being blown through the god darn roof . . .
      All in all the accident was caused, by the reactor design, and the issue with the controll rods/controll rod moderator displacer, wich they knew about but didnt tell the operators so there was no way for them to know that the az-5 could in some cases be a detnation button.
      Even with my previous statement the crew on shift at the time could have realised that the reactor was unspable due to being xenon poisoned and shut it down completely, wait 12 hours and then start it up slowly to prevent damage.
      Conclusion: chernobyls accident was caused by design flaws, keeping said flaws secret from operators and in the end Human error.
      And yes this is a very long text but ive always been facinated by the accident and nuclear stuff in general :)

    • @isaowater
      @isaowater Месяц назад +33

      Plenty of this has been disproven. The control staff was all pretty calm, yet tired. The decision to shut it down came when control shift chief, A.F. Akimov gave a simple shutdown order once turbine testing rounded up.
      Dyatlov had no real hold on reactor operation, he was more there on account of his position, he left all decisions to Akimov.

    • @mr.roboto209
      @mr.roboto209 Месяц назад

      One key thing to remember is this taking place in Communist Russia. If you don't meet your power quota, kiss your job/life goodbye

    • @christopherhoward8526
      @christopherhoward8526 Месяц назад

      @@isaowater And all operations were within the operational protocol! The RBMK design flaws were not known by any of the staff and mitigations were not in the operations manual. When things went tits up, the operators were blamed, not the government body responsible for developing operational protocols! This blame shift persisted into the HBO miniseries turning many of the good/innocent guys into victims and vice versa. All RMBK were bombs ready to go off given the right conditions until modified with upward control rods to prevent the bottom of the pile from going inadvertently critical! Dig in here www.youtube.com/@thatchernobylguy2915

  • @deitznuts7133
    @deitznuts7133 Месяц назад +4383

    "Hey, lets prank the guys on the reactor floor!"

    • @galactic-guy
      @galactic-guy Месяц назад +100

      It's just a prank bro

    • @HaSTaxHaX
      @HaSTaxHaX Месяц назад +140

      "you'll love their reaction"

    • @That_One_Guy...
      @That_One_Guy... Месяц назад +8

      More like trying to prank the world

    • @snakeplissken1933
      @snakeplissken1933 Месяц назад +3

      When the rods begin to move up and down like crazy in reactor room.

    • @kang6088
      @kang6088 Месяц назад +8

      PRANK EM JOHN

  • @Klonkus
    @Klonkus Месяц назад +1049

    Turning off the warning alarm instead of the exploding reactor is fantastic, what a real meeting of the minds over there.

    • @freshrockpapa-e7799
      @freshrockpapa-e7799 Месяц назад +13

      That's how things are done literally everywhere, maybe nowadays in some sectors it isn't.

    • @ultimateearrapechannel31
      @ultimateearrapechannel31 Месяц назад +93

      @@freshrockpapa-e7799 definitely not true safety wasnt nearly as much of a concern as it is nowadays. we have safety things everywhere now. they wouldnt even be able to lift the rods manually if this was after 2000

    • @ShuberFuber
      @ShuberFuber Месяц назад +18

      ​@@ultimateearrapechannel31also modern design placed more focus on not sending spurious alarm/warnings.
      So the moment an alarm actually went off everyone is on high alert.

    • @freshrockpapa-e7799
      @freshrockpapa-e7799 Месяц назад +1

      @@ultimateearrapechannel31 You literally just repeated what I said.

    • @Klonkus
      @Klonkus Месяц назад +28

      @@freshrockpapa-e7799 You said it with a smarmy attitude though so really I'd just prefer if you stopped responding entirely or removed your comment. You normies on the internet always having to be correct is annoying.

  • @senseii_philippines5353
    @senseii_philippines5353 Месяц назад +1514

    "The computer warns to shut down immedietly, instead they shut down the computer off" bro 😥

    • @isaowater
      @isaowater Месяц назад +90

      No such computer warnings happened, the SKALA system didn't make warnings. That bit of information came from Mr. Grigori Medvedev, a known liar in the Chernobyl field.

    • @PC-coolant-pipe-sucker
      @PC-coolant-pipe-sucker Месяц назад

      @@isaowater The computer DID warn them. I will give a source later.

    • @dyfrigshandy
      @dyfrigshandy Месяц назад

      ​@@isaowaterbla bla russian sympathizer bot
      You're the liar dyatlov boot licker

    • @andymarquez9902
      @andymarquez9902 29 дней назад +29

      Computer don't warned about it (that technology wasn't available at the time), the Nuclear Safety Regulation of the Soviet Union demanded that as mandatory in that situation: regulation was violated, including minimum of 30 control roads, 700 MWt and other important rules.

    • @stephenlafleur9028
      @stephenlafleur9028 14 дней назад +1

      >press any button to shutdown reactor
      >press the power button
      >computer turns off

  • @Mike_B-137
    @Mike_B-137 Месяц назад +1686

    3:29 rip headphones. And also rip to all people who died to Chernobyl NPP accident.

    • @nukegamereactor7750
      @nukegamereactor7750 Месяц назад +19

      And his Pc

    • @amramjose
      @amramjose Месяц назад +13

      There are two very well written books about it, one's title is Chernobyl: The History of a Nuclear Catastrophe. The other is Midnight at Chernobyl. I preferred the 1st title but both are outstanding.

    • @PsychoticDreams0
      @PsychoticDreams0 Месяц назад +5

      What like, 20 people?

    • @nonconnahordeath
      @nonconnahordeath Месяц назад +5

      @@PsychoticDreams0 ...yeah, bad news about that...

    • @PsychoticDreams0
      @PsychoticDreams0 Месяц назад +3

      @@nonconnahordeath More?.......25?

  • @straightpipediesel
    @straightpipediesel Месяц назад +3719

    Please keep the legend visible through all the events. 1 minute wasn't enough to memorize what everything was.

    • @Higgsinophysics
      @Higgsinophysics  Месяц назад +412

      Thanks for the suggestion. Too late to add now, but for everyone confused I would refer to the full video:
      ruclips.net/video/P3oKNE72EzU/видео.html

    • @neonatom8646
      @neonatom8646 Месяц назад +90

      good thing there's a 16 minute video explaining it..

    • @ermwhatdaheck
      @ermwhatdaheck Месяц назад +43

      you can just pause it man

    • @Sweetthang9
      @Sweetthang9 Месяц назад +210

      @@ermwhatdaheck They very politely requested something quite valid. Feedback isn't always negative and should be welcomed by content creators. Why do you feel the need to be snarky to them?

    • @TumbleTrashOfficial
      @TumbleTrashOfficial Месяц назад +12

      @@Sweetthang9 Its the truth though, that's one way to memorize it.

  • @c.lynnmiller5677
    @c.lynnmiller5677 Месяц назад +854

    “The chain of disaster is now complete.”

    • @adamhallgat3298
      @adamhallgat3298 Месяц назад +18

      Achievement unlocked

    • @albatross8
      @albatross8 26 дней назад

      THE CHAIN CANNOT BE BROKEN !! 🎉🥂🌊

  • @thedemolitionsexpertsledge5552
    @thedemolitionsexpertsledge5552 Месяц назад +1762

    Gordon! Get away from the-

    • @Arc_5
      @Arc_5 Месяц назад +122

      Shutting down! It's not-

    • @Aquatarkus96
      @Aquatarkus96 Месяц назад +49

      "let me see your passport"

    • @NikoPeludo
      @NikoPeludo Месяц назад +69

      “Prepare for unforeseen consequences.”

    • @spythere
      @spythere Месяц назад +7

      @@Aquatarkus96 Ah, fellow HLVRAI viewer

    • @SvendleBerries
      @SvendleBerries Месяц назад +47

      Gordon doesn't need to hear all of this, he is a highly trained professional.

  • @nolyspe
    @nolyspe Месяц назад +83

    I really hate it when my chernobyl accident simulations have people talking in them, so thanks for releasing the audio only version

  • @mr.voidout4739
    @mr.voidout4739 Месяц назад +371

    I'd like to see this kind of visualization in a horror game. A huge swath of buzzing particles rapidly escalating into an unbearable swarm, signifying a terrible fate.

    • @K._Oss
      @K._Oss 23 дня назад +8

      Chernobylite is pretty close!

    • @Lftarded
      @Lftarded 16 дней назад

      Build a reactor. You got a certain amount of funds, buy materials and make one... If it fails, delete system32

  • @TadyChick
    @TadyChick Месяц назад +269

    Well done and very informative. Puts a new perspective and better understanding of the biggest nuclear catastrophe of the last century.

    • @meowsqueak
      @meowsqueak Месяц назад +15

      Last century?

    • @simulify8726
      @simulify8726 Месяц назад +27

      The biggest nuclear catastrophe of the new century is Fukushima
      Chernobyl happened in 20th century

    • @aflac82
      @aflac82 Месяц назад +4

      ​@@simulify8726 Also, it wasn't even the worst. (looking at Mayak disaster in 1957)

    • @TadyChick
      @TadyChick Месяц назад

      @@meowsqueak Yes thanks for correcting me

    • @ethanblair981
      @ethanblair981 10 дней назад

      Which caused a greater loss of life, Chernobyl, or Hiroshima?
      Deliberate tragedies are still tragedies.

  • @JimOutofControl
    @JimOutofControl Месяц назад +209

    This video recommendation means I’ve levelled up. I think I’m now an adult.

  • @thelurker3795
    @thelurker3795 16 дней назад +17

    idk why this popped up in my feed, i am clueless when it comes to physics, and yet i am absolutely horrified.

  • @terrancestodolka4829
    @terrancestodolka4829 Месяц назад +211

    Have to admit at the 2:40 time point when the SAFETY COMPUTER tells them to shut it down... They acknowledge by going and turning off the computer! Amazing...!!!

  • @UnIimited_Power
    @UnIimited_Power Месяц назад +327

    As someone with zero knowledge of nuclear stuff, "wow so pretty when it starts changing colors!"

    • @MegaJani
      @MegaJani 26 дней назад +20

      "Hey, I'm blue now!"

    • @PKTraceur
      @PKTraceur 24 дня назад +30

      The fuel rods are constantly cooled with water, when heated up enough; they create steam, that steam rotated turbines just like any other power plant.
      The problem here is; without the control rods slowing down/stopping the fission, they got way too hot, and then completely out of control, Vaporising all water and melting everything around them.

    • @juanitobarragan9538
      @juanitobarragan9538 16 дней назад +4

      @@PKTraceurthx, now i can understand better

    • @artyom2801
      @artyom2801 14 дней назад +7

      The previous comment stated the steam engine principle, which is true but they neglected the entirety of this means.
      So from scratch I'll be brief as I can and as objectively correct as I can so sorry any nuclear physicist if I get something wrong.
      So to start, the Uranium is Fuel, when it fissions (as in it splits, it's the opposite of fusing), it creates fission products, AKA what is left of the uranium after being split apart and because the number of protons in a nucleus dictates what element of the periodic table is, you'll definitely get elements with a lower atomic number (IE the aforementioned number of protons) than Uranium. If you add them all up including the neutrons released, it adds up to the same sum of neutrons and protons (not gonna dip into radioactive decay of why sometimes there's one more and one less proton and neutron).
      Some of those products are so unstable that they are readily available receivers of neutrons, in the video there was Xenon, more specifically Xenon-135 as it's so unstable that ironically, getting another neutron (for reasons I won't get into) will make it a lot more stable. Basically what happened before removing the control rods was that the reactor got "Poisoned out" which isotopes like those are called reactor poisons. From my understanding, the engineers didn't know this was partially used fuel because of failure in the communication and were basically operating blind and shocked that it poisoned out.
      Here's more theory, so every fission in Uranium releases on average 2.3 something, can't remember, but it's a wildly varying variable but is frequently 2 to 3 neutrons. You will notice there's two types of neutrons. One of them is the fast neutrons, which are recently released fissioned while the other is thermal neutrons, whom have slowed down or "thermalized" releasing some energy as well. There's also delayed neutrons which is the fission products which unfortunately the video doesn't seemingly cover that but they basically just decay by neutron emission as opposed to the uranium fission.
      Finally there's the control rods and moderators you saw in the video. Control rods are the easiest, they basically just absorb the neutrons quite readily, like the poisons do, without the radioactive decay that is.
      Moderators are a slighty complicated because certain reactors use different ones but they just thermalize the fast neutrons, some are way better than others and others are a happy compromise.
      Water is an example, it's a moderator that doubles as coolant.
      RBMK (chernobyl model reactor and any russian reactor) didn't use water as a dedicated moderator, more so as a moderator by happenstance but a coolant first and using a different moderator.
      Here's a brief run down on the events.
      The reactor poisoned out while working at low power, with engineers deciding to pull the rods out (this has to be done slowly) and restarting the reactor.
      It works, but due to their ignorance cus they didn't get the memo, the slightly poisoned fuel was completely poisoned and was basically outputting power now because now the poisons serve as control rods and because poisons can be "burnt out" by having them capture neutrons, the reactor is on borrowed time.
      Finally, the power spikes and the engineers hit what is effectively the scram button where they drop the rods back in before things get much worse.
      One thing the video didn't communicate is that they jammed partway through and because they are graphite (another moderator but not intentional) "tipped", those tips just feed the reaction by slowing the neutrons more for reactions, which caused that huge fuckfest of a reaction of balls.

  • @faultyinterface
    @faultyinterface Месяц назад +119

    Worked on nuclear reactors for 5 years in the military, and the bad decisions in both design and operation of this reactor never ceases to amaze me.

    • @Anton43218
      @Anton43218 Месяц назад +10

      Mind explaining how the design of this reactor is bad?

    • @faultyinterface
      @faultyinterface Месяц назад

      @@Anton43218 The first thing that immediately comes to mind is the use of graphite tips on the control rods. They were used as a moderator, that is, they were used to reflect neutrons back into the core in order to generate more fission reactions. Water is used for the same things, but water flows and also acts as a coolant. Both have a negative temperature coefficient of reactivity, meaning that as temperature goes up, the ability to reflect neutrons goes down, which is good. Having graphite on the tips of the rods allowed for faster startups because at the same temperature, graphite is more reflective than water and therefore allows for a more rapid initial increase in power. This also leads to a problem with their design, where power spikes upwards when the rods are inserted from the fully withdrawn position because the more reflective graphite displaces the less reflective water. Part of the purpose of control rods is to displace the moderators with the neutron absorbent material of the control rod, but when the reactor was SCRAMed, the graphite tips shattered and spread the highly reflective moderator all over the inside, which led to the massive spike in power and was a large factor for the meltdown. To make matters worse, graphite is very flammable when heated enough and exposed to oxygen, which led to graphite fires and the further spread of radioactive material after the meltdown.

    • @faultyinterface
      @faultyinterface Месяц назад +62

      ​@@Anton43218 The first thing that immediately comes to mind is the use of graphite tips on the control rods. They were used as a moderator, that is, they were used to reflect neutrons back into the core in order to generate more fission reactions. Water is used for the same things, but water flows and also acts as a coolant. Both have a negative temperature coefficient of reactivity, meaning that as temperature goes up, the ability to reflect neutrons goes down, which is good. Having graphite on the tips of the rods allowed for faster startups because at the same temperature, graphite is more reflective than water and therefore allows for a more rapid initial increase in power. This also leads to a problem with their design, where power spikes upwards when the rods are inserted from the fully withdrawn position because the more reflective graphite displaces the less reflective water. Part of the purpose of control rods is to displace the moderators with the neutron absorbent material of the control rod, but when the reactor was SCRAMed, the graphite tips shattered and spread the highly reflective moderator all over the inside, which led to the massive spike in power and was a large factor for the meltdown. To make matters worse, graphite is very flammable when heated enough and exposed to oxygen, which led to graphite fires and the further spread of radioactive material after the meltdown.

    • @KNylen
      @KNylen Месяц назад +7

      @@faultyinterface Thanks for explaining!
      One question: maybe its a misunderstanding on my part, but you said the water is reflective/increase the fission reactions, when my understanding from the video explanation was it slowed it down?

    • @faultyinterface
      @faultyinterface Месяц назад +17

      @@KNylen It has to do with a few principals working together. The aforementioned temperature coefficient of reactivity and reactivity specifically. Having a negative coefficient means cooler water is more dense, and therefore is able to reflect more neutrons back into the core, while warm water is less dense and allows more neutrons to escape. In this way, a negative coefficient allows reactors to be semi-self regulating, as the hotter it gets, the more difficult it is to generate reactions. Another design flaw of the reactor was that when the water boiled, the steam voids had a positive coefficient. When they turned the pumps off and heat built up there was more steam, reactivity went up generating more neutrons, burning more xenon, allowing more fuel to be fissioned, generating more heat and steam, increasing reactivity, and so on. Burning the xenon was the intended goal, but doing it this way was foolish because reactivity was going up from both xenon burnout and steam buildup in the reactor, and these kinds of feedback loops tend to near instantly get out of control. For clarity, xenon-135 is a byproduct of fission and the decay of another fission byproduct, iodine-135, and has a very large cross section for absorbing neutrons. At lower powers for extended periods of time, xenon can build up quite a lot and reduce reactivity, but at higher powers, enough neutrons are generated to burn it off nearly instantly. Due to all these factors, they SHOULD have just increased power more slowly or just shut it off for 6 hours for the xenon to decay away naturally.

  • @kolomoetsan
    @kolomoetsan Месяц назад +251

    Я родился в 1981 году в СССР в городе Свердловск. Ныне Екатеринбург. Когда произошла эта авария, то шатало всю страну. Я был маленьким, но понимал, что произошла беда!
    А после вся страна работала на ликвидацию последствий чернобыльской катастрофы.
    Спасибо всем тем, кто боролся, страдал, отдал свою жизнь, но выстоял!
    А прошедшем летом я повез своих детей на Митинское кладбище, где похоронены под огромной бетонной плитой пожарники, которые отдали свою жизнь в Чернобыле. Без этого подвига мир не был бы прежним! Мы возложили цветы и поклонились.... Такой подвиг не должен быть забыт!

    • @ulanabdrakhmanov720
      @ulanabdrakhmanov720 Месяц назад +28

      В первую очередь не должна быть забыта ошибка

    • @Argentum46
      @Argentum46 Месяц назад +5

      Правильно - пожарные. Пожарники - это совсем другое

    • @kolomoetsan
      @kolomoetsan Месяц назад +8

      @@Argentum46, я с вами соглашусь. Но в данном случае эти нюансы из серии, корабли не плавают, а ходят - это не главное. Моё отношение к этому подвигу очень серьёзное.

    • @Argentum46
      @Argentum46 Месяц назад +2

      @@kolomoetsan да я не сомневаюсь, но пожарные могут очень резко негативно отреагировать на такое обращение, при мне в девяностых журналистам лица разбивали во время репортажа. Отец был пожарным, а друг его, который привёл в профессию - один из ликвидаторов. Обоих уже нет.

    • @MrScarabey
      @MrScarabey Месяц назад +4

      @@Argentum46вообще должно быть насрать, кто там на что в интернете обидится. Нормальные люди из-за сленговых разночтений лица не бьют. Распускаешь руки - в клетку, животное, к поехавшим вдвшникам, ходящим по воде морякам и прочим офанателым, подальше от журналистов и прочих мирных граждан.

  • @KNylen
    @KNylen Месяц назад +23

    Here’s my attempt at a very quick explanation (after watching the full video):
    neutrons= moving dots, subatomic particles with energy
    Uranium 🔵 Eject three neutrons when collision occurs
    Xenon ⚫️ when a Uranium atom “disappears”/decays, there is a chance it will appear. It absorbs neutrons, which causes it to disappear, so its overall effect on the system is a slowdown.
    Water [ ] slows down neutrons, but the more neutrons there are, the hotter it gets, until it evaporates (into a steam void)- which is like an immediate ‘off’ switch on its effect.
    control rod | An impenetrable wall that absorbs neutrons
    (Extra detail: moderators (white bars) cause the initially input neutrons (white moving dots), which move too fast to react, to slow down upon impact to a speed that will react (become black dots). Only adding this as a P.S. since it’s not completely required to understand the sim.)

    • @NotHughesy
      @NotHughesy 19 дней назад

      thank you, this helped me piece is together between the two videos.

    • @Sn0w424
      @Sn0w424 12 дней назад

      And the new moderator bars appearing at 3:20, those are at the tips of the control rods when the emergency stop button was pushed?

    • @KNylen
      @KNylen 12 дней назад

      @ Yes, in the full video he explains that he only decided to add them in at that point of the sim. I guess they were irrelevant before that point or something

  • @opalwinter6213
    @opalwinter6213 Месяц назад +30

    This was utterly riveting.
    I remember studying nuclear physics in highschool and became a bit obsessed with understanding precisely what happened in the Chernobyl event, among others nuclear accidents. A lot of the information was detailed and precise, but often felt a little distanced from what actually occurred.
    Seeing and hearing a model process the actual reaction connects me much more emotionally to the reality Chernobyl's techs would have experienced!
    Chilling 😱
    Thank you for the insight

  • @Kaldisti
    @Kaldisti Месяц назад +211

    "Not bad, not terrible"
    that good old Dyatlov

    • @enyaratna
      @enyaratna Месяц назад +6

      Not good not terrible

    • @eluberimabib4070
      @eluberimabib4070 Месяц назад +23

      @@enyaratna not GREAT, not terrible.

    • @enyaratna
      @enyaratna Месяц назад +3

      @@eluberimabib4070 da, you are the rightest, tovarisch

    • @agustinfrusto
      @agustinfrusto Месяц назад +1

      ​@@enyaratnaNah, that's actually what she said me last night

    • @maxd2215
      @maxd2215 Месяц назад +5

      You didn't see graphite on the rooftop ruble. You didnt. Because it's not there.

  • @Auroral_Anomaly
    @Auroral_Anomaly Месяц назад +87

    By the time they pressed AZ-5, the reactor was already so far into the runaway state that the control rods couldn’t get into the reactor, meaning that they got stuck in place and the reactor went out of control.

    • @isaowater
      @isaowater Месяц назад

      No runaway started until the displacers brought it on. You mention an outdated looking at the chain of events, it was disproven in 1992 with INSAG-7.

    • @MrRedeyedJedi
      @MrRedeyedJedi Месяц назад +11

      They were graphite tipped, as soon as they began lowering, it caused a massive spike

    • @Auroral_Anomaly
      @Auroral_Anomaly Месяц назад +3

      @@MrRedeyedJedi Actually, the graphite got stuck leading to the displacement of things that regulated the reaction.

    • @MrRedeyedJedi
      @MrRedeyedJedi Месяц назад +6

      @@Auroral_Anomaly yes, but the graphite itself caused the runaway to compound in the reaction, which is why they did away with it on control rods

    • @Auroral_Anomaly
      @Auroral_Anomaly Месяц назад +1

      @@MrRedeyedJedi No, they didn’t actually know that the reactor was stuck.

  • @nymalous3428
    @nymalous3428 Месяц назад +20

    With the captions, that was very informative for someone with little background knowledge of the subject.

    • @BryenRafael
      @BryenRafael 10 дней назад

      Are you an expert on nuclear bombs?

  • @amramjose
    @amramjose Месяц назад +8

    The RBMK were known, albeit not openly, to be dangerous and unstable at low power; Dyatlov ignored the test protocol and decide to bring the reactor down below the 700MW outlined in the test. Instead he brought it down below 200 and even lower when it was xenon poisoned. The rest is prolob.

  • @spywhere
    @spywhere Месяц назад +216

    The sound reminded me of Geiger Counter though. Not sure if that's actually what it does.

    • @Higgsinophysics
      @Higgsinophysics  Месяц назад +128

      It is!! Nicely spotted :D

    • @c64cosmin
      @c64cosmin Месяц назад +48

      Not a physicist but afaik, the way the Geinger Counter does make a bleep impulse sound when a particle collides with a detector, the particle has enough energy to activate and move some electricity to a speaker, we measure the amount of bleeps per minute I think to determine radioactivity in an area, might be very wrong, but that is my understanding of the whole process.

    • @codefeenix
      @codefeenix Месяц назад +3

      @@c64cosmin activate and move some electricity

    • @borincod
      @borincod 29 дней назад +4

      @c64cosmin particles do not have enough energy to move electricity to a speaker... Speaker works exclusively from the batteries. A particle should have enough energy just to ionize a single atom of gas in the tube. This causes avalanche ionization in the tube due to externally applied electric field. Thus, a particle role is comparable to a tiniest domino piece, which falls and causes other dominoes to fall afterwards

  • @Shadowwand
    @Shadowwand Месяц назад +103

    I think you need to keep the legend up, and maybe add counters to each one, so we can see numerically how much Xenon is poisoning the reactor. Etc.

  • @adamantiuscloudcat1799
    @adamantiuscloudcat1799 Месяц назад +29

    The fast development of events should remind us how fast things escalate out of control in life. It just takes a bad move.

    • @skruffytiger2002
      @skruffytiger2002 Месяц назад +9

      this was a sequence of carelessness that predated the event but normalized the behavior that caused it

    • @ramr7051
      @ramr7051 12 дней назад

      ​@@skruffytiger2002it's ok, blurting out platitudes is apparently cool on this website

    • @dougmasters4561
      @dougmasters4561 2 дня назад

      Wasnt this an entire series of bad moves? It seems rhe surge was sudden but the event itself was not.

  • @PH4RX
    @PH4RX Месяц назад +11

    When you say "only a minute after the test started" it makes it sound like the test was supposed to be longer.
    It was however only 45 seconds, to see if that gap could be bridged during a blackout.
    So the test was over and the reactor was meant to be shut down for maintenance via scram.

  • @R.M.S_Titanic1912
    @R.M.S_Titanic1912 Месяц назад +5

    I really enjoyed this video, great simulation, do you think you can make it public for people who want to play around with this, I know I do, and if so, can you add the ability to choose different types of reactors as well as make it available for mobile, if you can do this then i would love to play around with this, but if you can't, then I understand 👍, keep up the awesome work!

  • @zenout3463
    @zenout3463 6 дней назад +1

    also, the one line "the computer warns them to shut down immediately, so they shut down the computer instead" says SO much about the people employed to man all that power and protect thousands of lives. insane.

  • @joemash4193
    @joemash4193 Месяц назад +30

    Not exactly sure what I’m watching but I’m here for it

    • @Leon玲央
      @Leon玲央 28 дней назад +4

      You‘ve watched a simulation of the Chernobyl nuclear reactor and how the reactor went out of control.

    • @gir2005
      @gir2005 19 дней назад +4

      @@Leon玲央 clearly to everyone else it just looks like dots on a screen.

    • @dougmasters4561
      @dougmasters4561 2 дня назад

      This was an attempt to simulate several nations deciding the outcome of AI fought wars by various AIs playing a psycho game of breakout against each other Kinda like War Games with tic tac toe.
      At the end, the whole world is destroyed

    • @Leon玲央
      @Leon玲央 День назад

      @@gir2005 I was kidding, it is actualy a modern take on Pong.

  • @EnterpriseTNG
    @EnterpriseTNG Месяц назад +2

    Water = blue, Uranium = green metalic, Xenon = magenta, Non-Uranium = grey, thermal neutron = yellow, fast-neutron = orange, Moderator = pink, control-rod = red

  • @89TStefan
    @89TStefan Месяц назад +4

    I remember very well when we had this in high school in physics class.
    That was 20 years ago.
    And when you hear about it, it basically had to happen one day like that with this design and how they operated the reactor.
    In the end, the design traded safety for efficiency and they lost both with it...

  • @HelloThere-pf9sm
    @HelloThere-pf9sm День назад

    This is the loudest video I’ve heard on RUclips 😂
    Keep up the good work ❤

  • @Ogolero
    @Ogolero Месяц назад +269

    Also… when the system was powered down to 30% there was still latent Xenon build up that caused the failure process to begin. Had they powered down AND limited the water circulation by 20% would be be able to assume everything would’ve stayed stable?

    • @Higgsinophysics
      @Higgsinophysics  Месяц назад +244

      Tons of stupid things happened that day, and I think the total "system" (reactor and operator) is too complex to guess what would have happened if a few things changed.
      But experts have said it was a matter of time until the reactor would blow up, if not this day then another. Because of the unsafe reactor and unsafe culture

    • @deipalladium8362
      @deipalladium8362 Месяц назад +23

      Unsafe culture? Like in Threemile island and Fukushima?

    • @NotSure416
      @NotSure416 Месяц назад

      @@deipalladium8362 Tepco were actually good operators.

    • @W4lt3r89
      @W4lt3r89 Месяц назад +58

      @@deipalladium8362 Elaborate.
      How "unsafe culture" did Fukushima in? or Three-mile Island.

    • @Higgsinophysics
      @Higgsinophysics  Месяц назад +143

      @@deipalladium8362 No. There is no way you would be allowed and it's probably not even possible to turn off safety systems and its safety protocols. Only in USSR this flies

  • @skrafis
    @skrafis Месяц назад +48

    > the computer warns them to shut down immediately, so they turned off the computer instead
    This is a completely wrong statement. At least because such computer did not exist at all. There was kind of a statistical computer placed in a different room which gave out periodic non-critical information.
    The general reasons of the disaster are:
    1) miscalculated grid pitch of the reactor channels
    2) positive steam effect
    3) effect made by end parts of the rods
    Please also check INSAG-7 report for the correct reasons of the disaster. Here is a part of the report:
    The Chernobyl disaster was caused by the by the developers' choice of the RBMK-1000 reactor of a concept that, as it turned out, did not take safety issues into account sufficiently, resulting in physical and thermal-hydraulic characteristics of the reactor core that contradict the principles of creating dynamically stable safe systems. In accordance with the chosen concept, a reactor control and protection system was designed that did not meet safety goals. The physical and thermal-hydraulic characteristics of the reactor core, unsatisfactory from a safety point of view, were aggravated by errors made in the design of the control and protection system.
    The RBMK-1000 reactor, with its design characteristics and design features as of April 26, 1986, had such serious non-compliance with the requirements of safety standards and regulations that its operation was possible only in conditions of an insufficient level of safety culture in the country.
    The personnel actually committed violations of the regulations, and the Commission notes them in the report. Some of these violations did not affect the occurrence and development of the accident, and some allowed the creation of conditions for the implementation of negative design characteristics of the RBMK-1000. The violations committed are largely determined by the unsatisfactory quality of the operating documentation and its inconsistency, caused by the unsatisfactory quality of the RBMK-1000 design. The personnel did not know about some dangerous properties of the reactor and, therefore, did not understand the consequences of the violations committed. But this is precisely what testifies to the lack of safety culture not so much among the operating personnel, but among the reactor developer and the operating organization.

    • @tsergv
      @tsergv Месяц назад +5

      The point is not in the "culture", but in the fact that nuclear science is developing and not all the knowledge that we know now was known, modeled and tested in those years when those nuclear power plants were built. Each incident provided new knowledge, which was implemented in subsequent station projects. Unfortunately, a nuclear reaction cannot be carried out in a test tube. The nuclear reactor of the plant is the scientific test tube in which scientists study the physics of the reaction. The nuclear power plant of those years is not only a source of electricity, but also a scientific laboratory for scientists. Studying huge energies is always a possibility of incidents. Similarly, the history of aeronautics is a series of plane crashes.

    • @skrafis
      @skrafis Месяц назад +20

      ​@@tsergv This is yet another completely wrong statement. There were some reports and warnings from the engineers about dangerous processes and negative design features that were ignored by management in the period between 1975 (accident on LAES station) and 1986. Management knew about the problems and did nothing to prevent the negative consequences produced by them.

    • @ThatChildUnderYourBasment
      @ThatChildUnderYourBasment 23 дня назад

      Can I have your sources for this??

    • @fresh_dood
      @fresh_dood 16 дней назад +2

      @@tsergv effects of the Soviet bureaucracy were very much the cause, not the state of nuclear science. Chernobyl was very much a product of politics, not science. Case in point: the lack of any other reactors of its type in the world at the time. The very concept of a graphite moderated water-absorber reactor is inherently unsafe. It's well discussed and understood that Chernobyl was the final nail in the coffin for the USSR as much as it was its brainchild.

  • @EmanuelSN
    @EmanuelSN Месяц назад +18

    This really shows how the engineers really just didn't know how wrong things had gone
    It was all just so fast

    • @TheGologozo
      @TheGologozo Месяц назад +2

      Yes, they had no way of knowing, and no way of controlling it quickly enough and even the scram was basically faulty.

  • @Breashy_
    @Breashy_ 5 дней назад +1

    This is actually extremely unsettling. Very informative but thinking about this actually happening in the moment...

  • @Ogolero
    @Ogolero Месяц назад +36

    Great explanation. Everything makes sense but out of curiousity… why did the hydraulic system fail at the end to lower the rods? What was the system failure that prevented the rods from lowering as planned?

    • @Higgsinophysics
      @Higgsinophysics  Месяц назад +70

      No hydraulic fail.
      As far as I recall, the litterature debates if it's either cause by melted rods, or fractured rods blocking the path

    • @Ogolero
      @Ogolero Месяц назад +1

      @@Higgsinophysicsthank you

    • @deipalladium8362
      @deipalladium8362 Месяц назад +14

      Graphite channels deforming

    • @jimskywaker4345
      @jimskywaker4345 Месяц назад +11

      I'd heard that the fuel rods and steam channels started to expand and blocked the rods from moving in further.

    • @notme5844
      @notme5844 Месяц назад +6

      The graphite tips on the control rods caused a dramatic spike in reactivity, causing massive heating and damage to the rods, preventing them from inserting all the way.

  • @mkng2k
    @mkng2k 14 дней назад +1

    This no-talk simulation makes for a hell of an analogue horror video

  • @samelis6546
    @samelis6546 Месяц назад +6

    I don't know what I was looking at. I don't know what to expect. The end freaked me out better than most horror movie. What even happened.. Anyone want to just give a one liner for each of the legends' functions in the system?

    • @KNylen
      @KNylen Месяц назад +1

      I’ll try
      neutrons= moving dots, subatomic particles with energy
      Uranium 🔵 Eject three neutrons when collision occurs
      Xenon ⚫️ when a Uranium atom “disappears”/decays, there is a chance it will appear. It absorbs neutrons, which causes it to disappear, so its overall effect on the system is a slowdown.
      Water [ ] slows down neutrons, but the more neutrons there are, the hotter it gets, until it evaporates (into a steam void)- which is like an immediate ‘off’ switch on its effect.
      control rod | An impenetrable wall that absorbs neutrons
      (Extra detail: moderators (white bars) cause the initially input neutrons (white moving dots), which move too fast to react, to slow down upon impact to a speed that will react (become black dots). Only adding this as a P.S. since it’s not completely required to understand the sim.)

  • @TchaikovskyFDR
    @TchaikovskyFDR Месяц назад +2

    What I love is how you casually throw in what everyone generally talks about -- the Graphite Tipped Control Rods.
    "Like oh, this is the detonator we've created. Oh this is the detonate--"
    Really puts the point across how every RBMK Reactor was also therefore just casual bombs sitting in the Soviet Union suddenly. Lmfao.

  • @markrobertson6664
    @markrobertson6664 Месяц назад +85

    I heard comrade Diatlov was in the toilet

    • @n7346e
      @n7346e Месяц назад +7

      I doubt they had toilet technology

    • @Redstarka22
      @Redstarka22 Месяц назад +4

      Funnily enough, he was basically a fall guy. He was nominally in charge of the test by virtue of his position, but the actual lead engineer running the test and giving orders was A.F. Akimov; the guy who in the show asks Dyatlov to give his orders in writing.

  • @34silesia
    @34silesia 24 дня назад

    This one changed my life, thank you for your service

  • @Brian_Equator
    @Brian_Equator Месяц назад +9

    Hi, nice video, but factually not quite right if I may say so. The explosion was actually finally triggered by insertion of the control rods which interacted with water in the reactor, and the water acted as the moderator. This is the difference between designs that have positive and negative void coefficients. One gets colder as the water boils, the other gets hotter (like Chenobyl).
    Cheers,
    Brian.

  • @s.n.8128
    @s.n.8128 Месяц назад

    Hey dude, super fed channel. Så din 16 mins video inden, kanon forklaring på laymans terms.
    mere af det!

  • @Silanael
    @Silanael Месяц назад +146

    A nice animation, but you're further promoting the misconception that there was a power surge before EPS-5 was pressed. According to what we know, the reactor was stable prior to that, the insertion of the control rods triggering the event - though the operators unknowingly created the circumstances for that, a shutdown system should under no circumstances add reactivity.

    • @ericnewton5720
      @ericnewton5720 Месяц назад +31

      Kinda defies logic, saying the reactor was stable prior to the scram button being pressed. It may have seemed stable but any small deviation causes a runaway criticality event because there’s absolutely not enough control able to be asserted due to the boron parts of control rods being pulled.

    • @Silanael
      @Silanael Месяц назад +39

      @@ericnewton5720 The reactor was kept under control with the automatic regulator (AR) without any issues, but it was running with most of the manual rods pulled completely out of the core. This is by itself not bad; low ORM means that you can insert a lot of negative reactivity if need be. The thing with the boron followers was that they did not entirely cover the core, leaving a water column above and below them. Water in this case is primarily a neutron absorber while the graphite acts as a moderator. Due to this design flaw, when you insert a fully pulled rod, you get a reactivity increase. When the EPS-5 was pressed, it simultaneously inserted all the rods that were withdrawn, resulting in a spike in power at the lower part of the reactor that was enough to make it prompt-critical.

    • @BillyBob-bd1hj
      @BillyBob-bd1hj Месяц назад

      Exactly, if the reactor was totally stable, why hit the scram button?​@@ericnewton5720

    • @valentinaselektrikas
      @valentinaselektrikas Месяц назад +6

      "It has not been established why the scram button (EPS-5, also referred to as AZ-5) was pressed at 1:23:40. Annex I of the INSAG-7 report (see Reference 1 below), Report by a Commission to the USSR State Committee for the Supervision of Safety in Industry and Nuclear Power (SCSSINP), states: "Neither the reactor power nor the other parameters (pressure and water level in the steam separator drums, coolant and feedwater flow rates, etc.) required any intervention by the personnel or by the engineered safety features from the beginning of the tests until the EPS-5 button was pressed." The report adds: "The Commission was unable to establish why the button was pressed." However, according to Anatoly Diatlov, the plant's Deputy Chief Engineer at that time: "There was actually one reason for dropping the protection rods: a wish to shut down the reactor when work was finished" world-nuclear.org/information-library/appendices/chernobyl-accident-appendix-1-sequence-of-events

    • @nemo-x
      @nemo-x Месяц назад

      What. Most investigations and the controllers in the soviet investigation mentioned a surge before scram.

  • @koneeche
    @koneeche 16 дней назад +1

    Holy crap. Even if it's just a bunch of dots depicting a nuclear reactor, those last few seconds were jaw dropping.

  • @mikajlod25
    @mikajlod25 Месяц назад +5

    Thank you, this is amazing

  • @wlane55
    @wlane55 Месяц назад +1

    Outstanding explanation!! Thanks so much for this

  • @jayjaayjaaay94
    @jayjaayjaaay94 Месяц назад +6

    My feeling after watching last 5 seconds of the video : not great not terrible

  • @zenout3463
    @zenout3463 6 дней назад

    this was the entire story portrayed in a mere 3 minutes of little balls bouncing around the screen. omg when the balls sped up and there was no stopping it, the entire panic and explosion and death of what I imagine of the horrific event just flashed before my own eyes, my heart panicking. what an absolutely unique and interesting way to tell the Chernobyl story. my son introduced me to this simulation. very interesting! thank you

  • @Keru-5829
    @Keru-5829 Месяц назад +16

    I’m happy I was able to understand at least half of this video with my knowledge

  • @TheSAPGarden
    @TheSAPGarden 20 дней назад +1

    The end gave me anxiety! Nice simulation of a cascade of bad decisions.

  • @bsimic29
    @bsimic29 Месяц назад +4

    1:38 - I am puzzled by power drop to 1%, as a just scrammed reactor typically drops to 4 - 7% of nominal power, depending on fuel state: 4% when the fuel is fresh and 7% when fuel is at the end of life. As the unit 4 reactor was running at 50% up to that moment and the fuel was about to be replaced (end of life), it should have dropped to 3 - 4% of nominal power, not 1%.
    2:42 operators did not turn off the computer, it continued to operate to the very end. They simply ignored warnings (if there were any). They disconnected automatic control rod system and moved rods manually - and they did it an hour earlier - when power dropped to 1%.
    2:46 they agreed to raise the power to 200 MWt and start the test, as they were in a hurry to finish it. They could've reached more that 200 MWt, but they had to wait longer. 200 MWt was chosen as it was minimal power at which one turbine could operate.
    2:51 some pumps were turned off as they weren't needed for reactor running at half power. Water cooling wasn't slower because of that, actually running all pumps when reactor was at half/low power could trigger cavitation effect. Two pumps were turned back on as a part of the experiment, exaggerating the power drop issue.

    • @ThatChildUnderYourBasment
      @ThatChildUnderYourBasment 23 дня назад

      Can I have your sources? This correction sounds interesting but I don’t want to spread misinformation.

  • @Flw-uv2md
    @Flw-uv2md Месяц назад +1

    Love your video!
    1. What software are you using for the simulation?
    2. Also, what device is used?
    I had a simulation project but struggled to get good enough performance when it gets complex ;(

  • @WhiteDragon103
    @WhiteDragon103 Месяц назад +115

    thanks for the hearing damage

  • @blonkasnootch7850
    @blonkasnootch7850 19 дней назад +1

    Catastrophes like this are always made by choice, not a chain of choices, not by mistake only by one choice.

  • @guguigugu
    @guguigugu Месяц назад +14

    as I understand it, they reached the Xe pit because they tried to reach the low power state too quickly. a slower power down would have gradually burned most of the Xe by the time the reactor reached a low power level. this was the seminal error. then, trying to get out of the Xe pit too quickly again, they made the reactor unstable and it blew.

    • @isaowater
      @isaowater Месяц назад

      Increased water flow played a very heavy hand too, don't forget that.

    • @isaowater
      @isaowater Месяц назад +1

      Oh, I realized too late what you meant. The xenon from the power drop never burnt off, no power-spikes before AZ-5 was pressed. Remember the INSAG-7 chain of events.

    • @blockstacker5614
      @blockstacker5614 24 дня назад

      They were under tremendous pressure to get the test done as it had already been significantly delayed and the reactor was also needed for grid power. I suppose they were somewhat put into a position of either rushing the test, or expecting visitors from Moscow.

    • @isaowater
      @isaowater 24 дня назад +1

      @@blockstacker5614 the reactor wasn't being rushed back onto the grid, the tests (there were multiple) were selected to be done at the time they were because the reactor was being REMOVED from the grid for maintenance & repairs. This is typical for soviet power plants to do. Also the delay wasn't all that significant, it was just 12 hours, the only difference was that not all necessary personnel had appeared to conduct the tests and the control staff present weren't well versed in the details of the testing.

  • @haven9256
    @haven9256 10 дней назад

    That last part was straight up horror, I have never been more terrified by anything like this in such a while

  • @Risk437
    @Risk437 Месяц назад +17

    Do you taste metal?

    • @Davoodoox1
      @Davoodoox1 Месяц назад +9

      Impossible. Now go back to work.

  • @Chitose_
    @Chitose_ Месяц назад +1

    this simulation is plain awesome, even despite the tragedy responsible for the creation of this

  • @hotfightinghistory9224
    @hotfightinghistory9224 Месяц назад +9

    Thats some scary popcorn I tell ya...

  • @AntTheFanOfMurderDrones.
    @AntTheFanOfMurderDrones. Месяц назад +1

    Straight to the point, no useless yapping. i respect that 👍

  • @justcallmeavi3255
    @justcallmeavi3255 Месяц назад +11

    It's a cool simulation, it's wrong, but cool, Event 1: The power output was 75% not 50%, this was due to the intense energy demand for the local region, reactor 3 being closed for maintenance, Event 2: Power reduction was carried out incorrectly by a ill-informed crew, the night shift had little training in such scenarios, to reduce power a three man team carry out calculations with the SCALA computer systems and adjust the control rod, coolant flow and steam regulation from the core, they didn't do this, instead, Leonid Toptunov, a 25 year old nuclear control operator, missed a crucial step in the power regulation and the power plummeted, Event 3: Toptunov and Akimov attempted a "kick" power up procedure, this deviated from their training but feeling the pressure from deputy chief engineer Dyatlov they continued, they reduced the flow of coolant into the core and attempted the increase the steam by opening the steam valves all the way but it failed, Event 4, Dyatlov orders his men to retract the control rods and force the reactor into a "hot" state, safety systems were already disabled long before the test began, the SKALA computer could only report every 20 minutes, 1 minute before the test began it reported instability at the base of the core, the control rods that were retracted first were at the base of the core, here, a "hot spot" was generated, steam pockets pushed up through the moderator shafts to the top of the core giving a false reading that the core had reached 200MW, in reality the core was closer to 500MW, Event 5: The test begins, the power from the turbine is so low that the cooling pumps shut down as a precaution to prevent damage, coolant flow reduces to 30%, more steam is generated from less water, the steam separator drums are overloaded and pressure pushes back into the core, the sudden increase in pressure vaporises the water inside the core, to prevent the control rods, made from boron, from shattering within the intense heat and pressure of the core a "displacement rod" was at the end of each one, this was to push past the coolant and steam and allow the rods to slide in safely, these "displacement rods" were made from graphite not as a cost cutting measure but to act as a secondary moderator, to be used during a power up procedure, when the control room operators saw the power climb beyond 500MW they realised that a power surge was in progress and attempted a shut down by using the AZ-5 button or SCRAM, the control rods at the base of the core were inserted first, the "displacement rods" hit the hot spot no less than 1.7 seconds after the AZ-5 button was pushed, the power in the core increases hundreds of times a second, 2 seconds later a loud thunderous explosion is heard coming from underground, in this moment, the fuel rods rupture, spilling their contents into the channel, every molecule of liquid water vaporises, the sudden expansion shatters 50 moderator channels along with their respective control rods, 1.5 seconds later, inside the core, a mix of hydrogen, radioactive gases and pressure press against the 1000 ton upper biological shield, it gives way, like a can of beans blowing up over a fire, the shield smashes up against the wall of the refuelling hall, a massive volcanic eruption of radioactive debris blows the roof off reactor number 4 and the rest is history!

    • @ImpulseNOR
      @ImpulseNOR Месяц назад +2

      Fascinating. Use paragraphs and shorter sentences.

    • @justcallmeavi3255
      @justcallmeavi3255 Месяц назад

      @@ImpulseNOR no

    • @ГенкаСвист
      @ГенкаСвист Месяц назад

      "Oh my soy use reddit spacing because I cannot read with my tiktok attention span"

  • @InvictusEternal
    @InvictusEternal 25 дней назад

    Why was this terrifying? Really good visual!

  • @GregMatoga
    @GregMatoga Месяц назад +35

    What happened at 3:17? The "moderator" suddenly appearing under rods?

    • @juliuszkocinski7478
      @juliuszkocinski7478 Месяц назад +22

      IRL control rods had Graphite (moderator) tips. It was irrelevant up to this point, but they got stuck even more accelerating the reaction instead of controlling it

    • @dachhh
      @dachhh Месяц назад +17

      Dude just igored them, so the first 3 mins is incorrect. The reactor looked nothing like that. The simulation here also doesn't show the true cause, the graphite rods moved down into the lower core, displacing the water and increasing the reactivity there. This simply isnt shown. The video suggests the graphite rods getting stuck caused the runaway, but these rods were there the whole time. i think the "simulation" is not based on the actual reactor physics.

    • @camus83489
      @camus83489 Месяц назад +1

      i was wondering this too

    • @seeriktus
      @seeriktus Месяц назад

      Chernobyl's RMBK had graphite tips, which is bad design but cheap. They could have used another material, it's argued that this information was kept from the engineers and people running the reactor. So for the sake of money, the very SCRAM safety device that was meant to save them actually accelerated it and blew up the reactor.

    • @dachhh
      @dachhh Месяц назад +3

      @@seeriktus this was not kept from the engineers. The control rod was half graphite, the purpose was to accelerate the reaction as it entered the core, so the rod did double duty as brake and accelerator, increasing its effectiveness, and they knew all about that. You watch too much tv.

  • @TrueGamingVault
    @TrueGamingVault 28 дней назад +1

    Can someone tell me at what point there was still time to stop it and when it's too late? just curious.
    Great work H.
    Also is this in real time? as in, it really took only 3 minutes to destroy a whole reactor?

  • @ericnewton5720
    @ericnewton5720 Месяц назад +11

    Why were the pumps shut down as part of the test? I thought the whole point of the test was seeing if what was left of the steam reaction could keep the turbines generating enough power until the diesel generators could spin up and take over.

    • @Higgsinophysics
      @Higgsinophysics  Месяц назад +11

      Maybe shut down is an overstatement. But yea, you are correct. Test was trying to power the system by inertia of the turbines.. But what I wanted to capture in the simulation is this (from the wiki en.wikipedia.org/wiki/Chernobyl_disaster)
      "As the momentum of the turbine generator decreased, so did the power it produced for the pumps. The water flow rate decreased, leading to increased formation of steam voids in the coolant flowing up through the fuel pressure tubes"

    • @isaowater
      @isaowater Месяц назад +1

      @@Higgsinophysics Thank God we've had folks working to correct that wikipedia page, knowing that you're using it as a source.

  • @berserkedmaniac
    @berserkedmaniac Месяц назад +2

    I have no idea whats going on, but i love it fam

  • @SOU6900
    @SOU6900 Месяц назад +4

    The coolest game of Pong I've ever seen.😅

  • @spacecadet1968
    @spacecadet1968 Месяц назад

    That was the best explanation I've seen. Bravo!

  • @JusttKeridd
    @JusttKeridd 27 дней назад +4

    The SCRAM Part was absolutely horrifying knowing that people in the reactor has no escape from the radiation.

  • @yaelbj
    @yaelbj 8 дней назад

    After my usual boring go-to-sleep documentary ended here on RUclips, this video came up next, and it felt like I was dreaming, trapped in the Tesseract from Interstellar. I had to wake myself up just to find another video in my half-asleep state.

  • @QuantumRads
    @QuantumRads Месяц назад +3

    Didn't they shut all the control rods that cause the chain reaction with the graphite tips?

  • @joereedsmith1531
    @joereedsmith1531 Месяц назад

    Horrifyingly brilliant work.

  • @Etrehumain123
    @Etrehumain123 Месяц назад +2

    I know the reactor was bigger than the smiluation, but I just wondering if this matches somewhat reality about time event, or if chernobyl was like this, but in an instant

  • @dasunshine3204
    @dasunshine3204 Месяц назад +2

    Bro I was panicking what was wrong with my laptop then I noticed the sound was from the video at 3:30. This just gaved me heart attack.

  • @chevellechris1
    @chevellechris1 Месяц назад +4

    Now I need to go learn how moderators help fast neutrons slow down..

    • @iasimov5960
      @iasimov5960 Месяц назад +2

      A neutron collides with the nucleus of a moderator nucleus and imparts some of its energy to it. After several collisions the neutron has been slowed sufficiently to be absorbed into a uranium nucleus.

  • @Überflüssig-v7d
    @Überflüssig-v7d 18 дней назад

    the sound of the video is really nice to listen while falling asleep

  • @alperenerol1852
    @alperenerol1852 Месяц назад +20

    Not great not terrible

  • @SixOhFive
    @SixOhFive 23 дня назад +1

    I know very little about this subject, but from what I can understand, the people controlling the reactor were more worried about the reaction shutting down temporarily; than the reaction becoming uncontrollable and blowing up the reactor permanently. In my opinion this demonstrates a major lack of understanding and education.

  • @EngineeringScience015
    @EngineeringScience015 Месяц назад +7

    Some helpful tips: 1. Add the captions to your video. 2. Keep the legend up so people know what they are looking at. 3. Add the red square to the legend to let people know what it is. 4. Increase the tempo and suspense of your music as things go from good to worse.

  • @EEEEEEEEEEEEEEEE1
    @EEEEEEEEEEEEEEEE1 15 дней назад

    what i herd from one of Chernobyl powerplant engineers, is that it was a new safety protocol test for power outtages. The test was to check if powerplant was able to work of energy generated from it's turbine's inertia, which included lowering reactor output to dangerously low output. Workers were as always blamed by soviet union, but it was Soviet nuclear power authorities who were the main reason.

  • @derrickomlor7449
    @derrickomlor7449 Месяц назад +6

    Still not sure how Homer Simpson understands this but I don’t.

    • @Davoodoox1
      @Davoodoox1 Месяц назад +1

      In the newer episodes it is revealed his controls do nothing and he is really that stupid as everone thinks he is.

  • @thefourthdymensionmusic
    @thefourthdymensionmusic День назад

    actually pretty unsettling. especially in the end of the video when all of the mistakes and errors all start to stack up and cause the positive feedback loop, it starts to build up and then, boom.

  • @NunSuperior
    @NunSuperior Месяц назад +3

    Weird ASMR video, but I like it.

  • @reaganpm7968
    @reaganpm7968 Месяц назад

    ive never been terrified of bouncing dots so much, that evoked same feeling as the end of Insidious with the creepy mirror scene

  • @nowytoshiba
    @nowytoshiba Месяц назад +4

    3:17 Where do these lines suddenly come from? What kind of simulation is it when something appears in the middle of it like in Harry Potter?

  • @hitrapperandartistdababy
    @hitrapperandartistdababy 11 дней назад

    That ending actually was terrifying, knowing what it led too

  • @semibiotic
    @semibiotic Месяц назад +7

    Model is not illustrative:
    1. There are no somewhat clear visual signs of Xenon pit.
    2. Too many obscure "non uranium" cells magically become "uranium" ones.
    3. -Lack- -of- -proper- -"tip effect"- -illustration- Rod tips aren't visualized before the very final part, while control rods all the time had graphite tips.

  • @lllyd8706
    @lllyd8706 Месяц назад +1

    I've been in this job for 25 years and this video is wrong, raise the power.

  • @IgnorantBoot
    @IgnorantBoot Месяц назад +2

    Finally, some decent music

  • @Ycneuqerfesiar
    @Ycneuqerfesiar Месяц назад +9

    Best part: 3:00

    • @mcb9644
      @mcb9644 Месяц назад

      😂😂😂

  • @joyous-444
    @joyous-444 11 дней назад

    Jesus Christ, the sound in this really puts it into perspective for me