Chernobyl

defunct Chernobyl power plant, but the UN’s atomic watchdog said the
spent nuclear fuel stored there had cooled down sufficiently for it not to
be an imminent safety concern. Ukraine’s nuclear regulator said the power
supply to the Chernobyl plant failed on Wednesday morning, and the national
power company Ukrenergo said it was impossible to restore the power lines
because of fighting in the surrounding areas. The nuclear energy company
Energoatom said in a post on the Telegram messaging app: “Emergency
diesel generators are switched on at the site to supply power to
safety-critical systems. In case of trouble-free operation, the stock of
diesel fuel on diesel generators will be enough for 48 hours.”
Ukraine’s foreign minister, Dmytro Kuleba, said that after the 48 hours
were up, “cooling systems of the storage facility for spent nuclear fuel
will stop, making radiation leaks imminent.” However, the International
Atomic Energy Agency (IAEA) said there was enough water in the spent fuel
pools for the fuel rods to cool sufficiently to avoid an accident. It
referred back to a statement the agency made on 3 March which said that due
to the amount of time since the Chernobyl disaster in 1986, the spent fuel
had cooled down enough that “the pool is sufficient to maintain effective
heat removal without the need for electrical supply”.

Guardian 9th March 2022 

https://www.theguardian.com/world/2022/mar/09/chernobyl-power-supply-cut-completely-after-russian-seizure-warns-ukaine