r/nuclear

With all the recent news and rumors about potential military strikes near Iran's Bushehr Nuclear Power Plant, I’m seeing a massive wave of apocalyptic maps and panic about "radioactive clouds" covering the Middle East, the Caucasus, and even parts of Europe.

My name is Siarhei Besarab, I am a scientist, radiation/nuclear safety researcher and a guest X-risk expert in GCRI. I am quite frankly exhausted by the amount of anti-scientific, alarmist nonsense being generated by "armchair geopolitical analysts." Let’s take a deep breath and look at the actual physics, reactor design, and Probabilistic Risk Assessment (PRA) reports.

>TL;DR: A Chernobyl-like disaster is physically impossible at Bushehr. The plant's architecture, its heavy concrete containment dome, and reactor thermodynamics strictly prevent massive stratospheric radioactive releases, even in the event of military strikes.

https://preview.redd.it/pnl5n98m8ltg1.jpg?width=900&format=pjpg&auto=webp&s=758e193b8dce7fa56ed90111548deaaabc929048

Here is why:

1. What exactly is built at Bushehr?

The operational Bushehr unit is built by Rosatom. Inside is a classic Russian VVER-1000 (modified version V-446, adapted for high seismicity and integrated into the legacy Siemens structures). It’s an analog to the heavily tested reactors operating at the Kalinin, Balakovo, Novovoronezh, and Volgodonsk NPPs. This is a well-known, mature technology relying on a "defense-in-depth" concept. It features 4 sequential, massive physical barriers preventing radiation from escaping into the environment. It has zero architectural similarities to the RBMK reactor that exploded at Chernobyl.

2. The myth of the "frail dome" falling to 155mm shells

Many pundits claim the containment structure is weak and vulnerable to standard artillery. This is entirely false. The VVER containment is a colossal structure made of pre-stressed, heavily reinforced concrete:

• The thickness of the main vertical load-bearing wall is 1.2 meters (approx. 4 feet).
• The thickness of the dome is 1.0 meter.
• The entire interior volume is lined with an 8 mm-thick steel alloy plate to guarantee leak-tightness.

A standard 150/155mm high-explosive artillery shell, designed for unarmored targets and trenches, cannot pierce concrete of this thickness and grade. Without specialized, heavy, aviation-dropped bunker-busting "penetrator" munitions, breaching a VVER-1000 containment dome is physically impossible. Furthermore, PRA stress-tests (Fragility Curves) show the dome has a median failure limit of roughly 0.85 MPa (about 8.5 atmospheres) of internal pressure. It's built like a bunker.

3. The myth of the reactor "shooting up" into the sky

People mistakenly associate an attack on a nuclear plant with a rapid, guaranteed ejection of the reactor and its fuel upward into the atmosphere (a so-called rocket-like vessel failure). Thermodynamics of pressurized water reactors (VVER/PWR) effectively rule this out. The configuration of the internal reactor structures physically prevents an "energetic steam explosion" capable of rupturing the bottom head in a way that would turn the installation into a rocket.

>No powerful explosive ejection mechanism = no "fountain of nuclear fuel" shooting up to contaminate half a continent.

4. The worst-case scenario (Direct hit + Meltdown)

Let’s indulge the doomsday preppers and imagine the worst: a massive bunker-buster penetrates the roof, the plant suffers a total station blackout, coolant boils off, and an irreversible thermal core meltdown occurs with a breached containment dome. Does a deadly cloud of Strontium-90 and Cesium-137 float over the Caucasus and Europe?

>No. It does not.

Radionuclides don’t mostly leak as a "magic invisible gas." They exit the melted core in the form of refractory chemical compounds and heavy, wet radioactive aerosols.

Here, basic physics takes over:

• These heavy aerosols inevitably undergo rapid agglomeration and gravitational settling.
• The VVER dome is equipped with a sprinkler (containment spray) system. Even operating briefly or residually, this heavy moisture physically "washes down" the lion's share of Cesium, Iodine, and heavy isotopes onto the floor of the reactor hall (a well-known nuclear safety phenomenon called plate-out).
• Most importantly: There is no highly flammable reactor graphite in a VVER! Chernobyl burned for days because tens of thousands of tons of graphite ignited, creating a massive thermal updraft that lofted radioactive ash into the stratosphere. A VVER has nothing that burns like that.

Even with a hole in the roof, the breached containment behaves like a giant catching flask. The contamination is severely contained and deposited on the internal plant structures.

Conclusion:

A cinematic Hollywood-style nuclear apocalypse triggered by random shelling or missiles is a physical fantasy. The VVER-1000's structural architecture restricts the severe impact zone purely to the immediate industrial site. In the absolute worst-case scenario, we are looking at an evacuation radius of roughly 5 to 10 kilometers (3 to 6 miles).

You can close those terrifying "radioactive wind maps" circulating on X/Reddit. Trust physics, not hype.

I will gladly answer any technical questions in the comments!

***

FAQ/Best Questions from the Comments

• What happens if a targeted airstrike avoids the impenetrable dome and instead destroys all unprotected backup generators, power lines, and cooling water intakes, deliberately forcing a complete Station Blackout and core meltdown
• Nuclear-grade reinforced concrete I know and love
• Are spent fuel pools safe? (Protected by the containment dome)
• Could the cooling system leak radiation into the Persian Gulf?
• Will bunker-busters create radioactive dust clouds over Iran?
• Do all modern designs have the spent fuel pools in the containment building?
• What is "Plan B" if the government collapses, personnel flee, and the bombed-out plant is completely abandoned? Who stops the disaster?
• If the staff flees and the plant is only 400m from the sea, won't a meltdown physically flush radiation and poison the entire Persian Gulf?
• How much heat does a meltdown actually produce, and how long can a core catcher safely hold the lava (corium)?
• What about Israel's Dimona nuclear facility? Is it built and protected the exact same way as Bushehr?
• If containment is damaged: evacuation distance, spent fuel hazards, and seawater contamination risks for Qatar

📚 My early practical Radiation Protection Guides

With the FCD concrete pour on April 4th of Jinqimen 2, China officially has 38 reactors under construction and 62 in commercial or trial operation for a total of 100 units.

Jinqimen will also be first site to build the CNNC Hualong 2.0, pending approval later this year. The main feature of the Hualong 2 is an improvement of the passive containment design, eliminating the need for backup diesel generators.

The New York Times article argues that the current war involving Iran is reshaping how countries think about nuclear energy, turning it from a climate-focused option into a national security priority. The conflict has exposed how vulnerable global energy systems are to geopolitical shocks, especially with oil supply disruptions and threats to infrastructure like the Strait of Hormuz. As a result, governments are increasingly viewing nuclear power as a way to achieve energy independence and reduce reliance on volatile fossil fuel markets. The piece highlights that even countries previously hesitant about nuclear are reconsidering it, particularly newer technologies like small modular reactors, which are seen as faster to deploy and more flexible. At the same time, the war underscores the risks tied to nuclear facilities in conflict zones, with strikes near Iranian nuclear infrastructure raising fears of catastrophic accidents. Overall, the article frames nuclear energy as both more strategically important and more geopolitically sensitive in a world of rising conflict.

This allows construction of the unit building foundation. Each Stage of Construction is held until previous stage compliance is confirmed. Darlington already has 4 full sized CANDU reactor units producing 3.5GW.

I believe this will be the first commercial SMR to be built in North America, if not the world. FYI

Approval Letter.

>March 30, 2026

>Mr. Mark Knutsen
Senior Vice President, Enterprise Engineering and Chief Nuclear Engineer
Ontario Power Generation Inc.
1908 Colonel Sam Drive
Oshawa, Ontario  L1H 8W8

>Subject: DNNP LTC – Request for CNSC consent to remove the regulatory hold point prior to installation of reactor building foundation

>Dear Mr. Knutsen,

>The purpose of this letter is to respond to the Ontario Power Generation (OPG) submission [1], which requests removal of the first regulatory hold point (RHP-1) to allow construction associated with the installation of the Reactor Building (RB) foundation, and provides the associated completion assurance document as per the Ontario Power Generation – Canadian Nuclear Safety Commission (CNSC) Staff Protocol for the Management of Regulatory Hold Points (RHP) [2].

>The Canadian Nuclear Safety Commission (CNSC) staff assessment [3] of OPG’s submission, as well as all supporting documentation, concludes that OPG has met all the pre-requisites established by the Commission to remove RHP-1. Therefore, as the person authorized by the Commission and pursuant to Licence Condition 15.3 of the Darlington New Nuclear Power Reactor Construction Licence 32.01/2035, I consent to remove RHP-1. OPG may now allow construction associated with the installation of the RB foundation.

I saw a post somewhere here on Reddit that I can't seem to find anymore detailing potential jobs in RP. It said something about half a year of work for seventy grand.

I have contacted Westinghouse Nuclear and begun their online training course, being enrolled in RPFUN01, with subsequent testing for their online modules. However, I seem unable to get in contact with anybody from the company regarding an issue I am having: I was assigned the RPFUN01 course's seven tests six total times, many times with issues. After the very first round, where I got a ninety or higher on every test but one (In which I had a seventy percent score, roughly) I was assigned the tests again where I was unable to do one of the tests due to apparently receiving an invalid session link... Despite receiving an email for it and clicking directly on the email.

After completing them four times just to be safe, I was finally assigned RP02 tests, but I did not receive any additional learning material. Despite this, I got a fifty and thirty-three, but instead of being reassigned the RP02 tests, I was once again given the seven RPFUN01 tests.

And then, after completing them a few days ago... I was given them again.

I attempted contacting Westinghouse about this by calling a number listed online through a google search, but I could not get in touch with an actual human being. I was either routed through an automated system for customer issues or current employee standing, or the one singular extension that seemed to connect to a human being would not connect through. I also attempted to contact the company by sending emails to the recruitment email through which I first reached out for the training, as well as by emailing the person assigning me the tasks, Sharon Casey, via their Westinghouse email.

I am unsure what to do or how to proceed. I was really sold on the decent pay with a large amount of downtime where I would be able to either take a break or get another job, haha...