Atomic energy specialist Professor Robin Grimes and former nuclear scientist Cheryl Rofer answer your questions about nuclear power stations in Ukraine after Russia attacked Zaporizhzhia
The giant protective dome built over the sarcophagus covering the destroyed fourth reactor of the Chernobyl Nuclear Power Plant (
Image: AFP via Getty Images)
The world looked on in shock as Russian troops rained bombs down on the Zaporizhzhia nuclear plant in Ukraine, EuropeтАЩs largest nuclear reactor.
But what could have happened, and is there a danger of a nuclear disaster?
Here, atomic energy specialist Professor Robin Grimes, who previously advised the UKтАЩs Ministry of Defence, and former nuclear scientist Cheryl Rofer, who worked for the US governmentтАЩs Los Alamos National Laboratory, and spent 35 years clearing up nuclear sites in the former Soviet Union, answer your questions.
How many nuclear power stations are there in Ukraine?
Four, as well as the now-retired Chernobyl : Zaporizhzhia; Khmelnytskyi Nuclear Power Plant in Netishyn and Rivne Nuclear Power Plant in Varash, both west Ukraine; and the South Ukraine Nuclear Power Plant in Yuzhnoukrainsk, south Ukraine.
They need that many because thatтАЩs how 51% of its power is generated. They are third most nuclear dependent nation, after France (70%) and Slovakia (53%).
Surveillance camera footage shows Zaporizhzhia nuclear power plant during shelling
(
Image:
Zaporizhzhya NPP via REUTERS)
How big are they?
Zaporizhzhia has six light water reactors. The other three have nine between them. Chernobyl had four.
If any of the reactors in the plants are hit by a rocket, could it cause a nuclear explosion?
Ms Rofer says: тАЬThe reactors all have outer concrete containment structures that can sustain a hit from a 20-tonne airplane.
There is no way to cause a nuclear explosion – like a nuclear bomb – with reactors.тАЭ
Smoke seen at the Zaporizhzhia nuclear power plant
(
Image:
via REUTERS)
Firefighters work at the entrance to the Zaporizhzhia nuclear power plant
(
Image:
via REUTERS)
What could happen?
Ms Rofer says: тАЬThe worst would be a fire in the spent fuel storage pools. This would release radioactive material into the atmosphere. The effects would be mostly local, within tens of miles. Some material might be carried on the winds, which, in that part of the world, are usually toward Russia.тАЭ
How would an explosion at Zaporizhzhia compare with Chernobyl?
Prof Grimes says: тАЬClaims it would be many times greater than Chernobyl are ridiculous. Zaporizhzhia has about the same amount of nuclear material as Chernobyl did.тАЭ
The attack on the Zaporizhzhia nuclear plant
(
Image:
Press Association Images)
WhatтАЩs the process of turning off the plants?
Ms Rofer says: тАЬI think all the reactors but one at Zaporizhzhia have been shut down but they still require cooling water. Shut down reactors are slightly less dangerous, but leaks and fires are still possible.тАЭ
Prof Grimes adds: тАЬThe way to be safe is to put all reactors into тАШcold shutdownтАЩ [when a coolant is added to keep it below 93C]. Then you can walk away for months.тАЭ
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