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Scene report from the Chernobyl Zone

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81–90 of 264 posts

Re: Scene report from the Chernobyl Zone

#81
post #79

> Standing in the bleachers, listening to the Pripyat municipal overture of resounding bird song, the only thing we could do was stare out at the trees and wonder "how long until New York looks like this?" I'm curious what the author meant by this. Does he mean how long would it take NYC to look like Chernobyl after a similar nuclear/natural accident happened? Or do they have a fatalistic outlook on the future due to…

> fatalistic

I do not think it means what you think it means.

Re: Scene report from the Chernobyl Zone

#82
post #52

Earlier quoted context omitted.

It's actually wrong on several levels. First of all, in the show the characters explicitly state that they are referring to a steam explosion. A steam explosion in the megaton range isn't just implausible, it's patently absurd. The upper bound on the real number is lower by 4-5 orders of magnitude. Don't get me wrong - it would still have been extremely disasterous and could have increased the total radionuclide emis…

In the context of a drama about the explosion and aftermath, I'd say it's quite reasonable to use an absurd number from one of the physicists involved. Perhaps it was indeed wrong, but it sounds like that might be actually what those involved believed at the time .

That is very unlikely, at least at the higher executive commitee level. It's impossible to exclude the possibility entirely, of course, but there is no surviving evidence of it and it certainly doesn't appear in Legasov's original report (or any subsequent study).

Re: Scene report from the Chernobyl Zone

#83
post #5

The pictures are lovely and the reflections profound. But much of the cited data here appears wrong. For instance, the article states (italicized): "six hundred helicopter pilots were killed" and yet it was only 600 helicopter pilots who _flew_ liquidator missions[1], two of which were killed in an piloting accident and none were registered killed from immediate radiation exposure[2], though at least one eventually d…

Exactly this, the numbers of casualties and description post disaster and the heroics during the disaster are not corroborated by the data. Given the secrecy of the old Soviet system about such "embarassing" events I doubt we'll ever know exactly how many people died but the massive casualty rates that get casually flicked around make for a good story but aren't supported by any external documents at all. Perhaps we'…

> Perhaps we'll find a mass grave somewhere full of radioactive bodies of dead workers but barring that, most data based consensus puts the total death toll from all radiation effects at less than 1,000 and usually less than 100.

The problem is that to this day we struggle to fully understand the effects of long-term low-level radiation exposure because figuring those out usually requires long-term epidemiological studies, which are expensive and complex [0]

[0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2757021/

Re: Scene report from the Chernobyl Zone

#84
post #34
post #5

The pictures are lovely and the reflections profound. But much of the cited data here appears wrong. For instance, the article states (italicized): "six hundred helicopter pilots were killed" and yet it was only 600 helicopter pilots who _flew_ liquidator missions[1], two of which were killed in an piloting accident and none were registered killed from immediate radiation exposure[2], though at least one eventually d…

You seem to have cherry picked sources that have a lower estimate for all these figures, i.e., "propaganda numbers". I think the best source for these numbers is the Wikipedia article "Deaths due to the Chernobyl disaster" [1]. From the article, Russia claims "estimates ranging from 4,000" while scientific and environmental organizations claim "no fewer than 93,000". It's clear that Russia wants to downplay the enorm…

You rejected a primary source and proposed a secondary source of amateur curation?

Re: Scene report from the Chernobyl Zone

#85
Can anyone comment on the validity of the 5 MT explosion when the core material hit water? This was also stated the the HBO show.

I don’t think 5 MT fission bombs are even possible, as they tend to blow themselves apart.

Re: Scene report from the Chernobyl Zone

#86

I found it very distracting that none of the ostensibly Russian or Ukrainian characters have an even remotely slavic accent.

Somebody, please explain me, why out of blue it became fashionable to put that native-sounding flavour of an accent in games and movies even when its story assumes almost every character in it is a native speaker?

I always find it disturbing. As every native Russian speaker, I tend to feel it perceive as beautiful and melodic. Just as any other Russian, Ukranian, Greek or whoever else. Sounds like a joke and not a good one. Makes me skip the whole title.

Why are they doing it? Does it really help anybody with immersion?

Re: Scene report from the Chernobyl Zone

#87

Earlier quoted context omitted.

I don't get the feeling it's very accurate, but it is very entertaining. EDIT: the accuracy I am referring to is about the actual sequence of events of the plot, which I understand to be simplified as people replying have pointed out :)

This Twitter thread speaks to this, (supposedly) from a Russian guy. He said that as far as Soviet life goes it's extremely accurate. https://twitter.com/SlavaMalamud/status/1132029943297265664

Yes. I lived in Soviet Ukraine at the time. While the British actors do take away some authenticity from it, the look and feel of 1980's Soviet Union is incredibly accurate. I showed a clip to my parents and they were like "wait, what, this is not a documentary?"

Re: Scene report from the Chernobyl Zone

#88

Earlier quoted context omitted.

Exactly this, the numbers of casualties and description post disaster and the heroics during the disaster are not corroborated by the data. Given the secrecy of the old Soviet system about such "embarassing" events I doubt we'll ever know exactly how many people died but the massive casualty rates that get casually flicked around make for a good story but aren't supported by any external documents at all. Perhaps we'…

> Perhaps we'll find a mass grave somewhere full of radioactive bodies of dead workers but barring that, most data based consensus puts the total death toll from all radiation effects at less than 1,000 and usually less than 100. The problem is that to this day we struggle to fully understand the effects of long-term low-level radiation exposure because figuring those out usually requires long-term epidemiological st…

Okay. I'm trying to understand the "low level radiation" part though. What is disappointing about the study you reference is that they don't characterize what the level of radiation is compared to normal background radiation, they don't account for changes in population or diet, and they don't account for changes in industry.

As the study itself states: "These conclusions are regrettable because low statistical significance only means that chance has not been excluded as an explanation, assuming no bias and no real effect. In more detail, p values -that is, the probabilities that observed effects may be due to chance - are affected by both the magnitude of the effect and the size of the study. This means the results of statistical tests must be interpreted with caution [26]."

Meta studies based on statistical analysis is inherently challenged. This one is no better (and no worse) than the others.

Re: Scene report from the Chernobyl Zone

#89
post #19

Earlier quoted context omitted.

I think there's a lot of uncertainty in talking about Chernobyl, since most of the information published by the Soviet authorities was intentionally incorrect or misleading, designed to downplay the significance of the accident. One thing I've found interesting in talking about Chernobyl is that advocates of nuclear power are often willing to accept the Soviet numbers as fact, since they confirm the idea that nuclear…

> One thing I've found interesting in talking about Chernobyl is that advocates of nuclear power are often willing to accept the Soviet numbers as fact, since they confirm the idea that nuclear power is still relatively "safe" even in case of disaster. I believe the IAEA report (which you can read yourself) put together by the United Nations and relevant affected governments in the mid-2000s. It shows that over the e…

Most of those 7.3 million deaths are from people burning local fuels (wood, trash, dung, etc.) for heating and cooking.

It's seems unfair to compare subsistence, low-tech energy (dung burning) to nuclear energy.

It makes a lot more sense to compare high-tech nuclear energy with high-tech renewables (with storage).

Re: Scene report from the Chernobyl Zone

#90
post #75

Earlier quoted context omitted.

It's actually wrong on several levels. First of all, in the show the characters explicitly state that they are referring to a steam explosion. A steam explosion in the megaton range isn't just implausible, it's patently absurd. The upper bound on the real number is lower by 4-5 orders of magnitude. Don't get me wrong - it would still have been extremely disasterous and could have increased the total radionuclide emis…

>That possibility was briefly considered and quickly dismissed as improbable in the extreme, which it was. A nuclear explosion would require Uranium enriched to at least 85%, whereas the fuel in RBMK reactors was only enriched to 2%. It's not just unlikely it's actually impossible.

That's not entirely correct. There is no specific level to which uranium (or any other fissile material) must be enriched before supercriticality may occur, the level of enrichment simply determines the critical mass required. For instance, the critical mass for pure U-235 is around 50kg, while for 20% enriched U-235 you'd need about half a ton or so. [1]

In the case of Chernobyl, the concern was that upon contact with water (which acts as a neutron moderator in these circumstances) and given the inevitable sequence of steam explosions that would follow, some regions of superheated corium might be forced into prompt criticality events. These would technically qualify as nuclear explosions, but the sequence of events required to get from this set of increasingly improbable assumptions to anything remotely close to a megaton range explosion is, as I said, improbable to the point of being trivially dismissable.

[1] EDIT: I realized I should probably point out for clarity that I'm referencing the traditional measures for a critical mass - the mass required for a homogenous sphere of a given material to go critical. Determining the critical mass for a highly inhomogenous material of complex geometry, highly varied temperature and potentially surrounded by neutron reflecting substances is not a trivial task.

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