The Zaporizhzhia nuclear power plant is the biggest in Europe.
Russian forces have occupied the site since early March, and Ukraine says the situation at the plant is “approaching critical”.
The UN’s nuclear watchdog has called for an immediate end to any military action near the plant,warning of a “very real risk of a nuclear disaster”.
The Russians have been urged to hand control of the plant back because of the dangers, and some staff there have told the BBC they’re “being kept at gunpoint”.
Nato is the latest international organisation to call for UN inspectors to be let into the plant, claiming its seizure posed a serious threat to Ukraine and neighbouring countries.
Officials say the plant could be cut off from power as Moscow tries to redirect electricity to Crimea, which it annexed eight years ago.
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