An operational event at Ling Ao Nuclear Power Station was reported today on the Daya Bay Nuclear Power Operations & Management Company website, the Security Bureau said.

On December 26, the No.2 reactor of Phase 1 of the power station was shut down for a planned refuelling outage. During refilling for the primary circuit, the concentration of moderator (boric acid solution) in the refill water was found to have slightly exceeded the relevant limit temporarily.

Station staff immediately rectified the situation. The event had no safety effect on the plant or its personnel. It was classified as a "Level 0" event on the International Nuclear Event Scale, which means it had no safety significance.

Details can be viewed in the "operational events" section on the "nuclear and radiation safety information" webpage of the company’s website.