Exclusive: US assessing reported leak at Chinese nuclear power facility

The US government has spent the past week assessing a report of a leak at a Chinese nuclear power plant, after a French company that part owns and helps operate it warned of an "imminent radiological threat," according to US officials and documents reviewed by CNN.

The warning included an accusation that the Chinese safety authority was raising the acceptable limits for radiation detection outside the Taishan Nuclear Power Plant in Guangdong province in order to avoid having to shut it down, according to a letter from the French company to the US Department of Energy obtained by CNN. Despite the alarming notification from Framatome, the French company, the Biden administration believes the facility is not yet at a "crisis level," one of the sources said.