ByFRANK JORDANS Associated Press
BERLIN — A Ukrainian nuclear power plant that has been surrounded by Russian forces lost power Wednesday morning when a Russian missile damaged a distant electrical substation, increasing the risk of radiation disaster, according to the plant’s operator.
Ukrainian authorities decided several weeks ago to power down the last reactor to reduce the risk of a catastrophe like the one at Chernobyl in 1986, where a reactor exploded and blew deadly radiation across a large vast area.
But the reactor core and used nuclear fuel must still be cooled for lengthy periods to prevent them overheating and triggering dangerous meltdowns like the ones that occurred in 2011 when a tsunami hit the Fukushima plant in Japan.
Some European countries are trying to prepare for the worst and started stockpiling iodine tablets to help protect their populations from possible radioactive fallout.
In the event of a disaster, the biggest risk outside Ukraine could be to Russia, “depending on which way the wind blows,” said Paul Dorfman, a nuclear expert at the University of Sussex in England.
“The main deposit is likely to be in Ukraine and or Russia, but there could be significant radiation pollution in Central Europe, which is why countries around Ukraine are now thinking very seriously about issuing stable potassium iodide tablets,” he said.
LIMITED POWER SUPPLY
The Zaporizhzhia plant has been receiving external power to ensure the important task of cooling the reactor and spent nuclear fuel can continue, but the connections are at constant risk of disruption due to the conflict.
As power lines and substations have been damaged in fighting, Ukraine’s nuclear operator Energoatom has been forced to repeatedly rely on diesel generators. These generators, which have enough fuel for at least 10 days, have kicked into action when external power has failed — but experts say their repeated use over a short period of time increases the risk of a disaster.
“There are several redundancies and the facilities are now repeatedly on the last one,” said Mareike Rueffer, head of the nuclear safety department at Germany’s Office for the Safety of Nuclear Waste Management.
Shutting down the plant’s last reactor several weeks ago significantly reduced the risk of a radiation disaster by gradually increasing the time it would take for a meltdown to occur. But if cooling fails due to a complete loss of power, meltdowns would still happen eventually, said Rueffer.
Dorfman said that in the worst case, Ukraine could see a situation similar to what happened in Fukushima.
“You’d see a heating of the high level spent fuel ponds. You’d see a hydrogen explosion, as we saw in Fukushima,” he told The Associated Press. “And then you’d see a significant radiation release.”