A report by China's Ministry of Environmental Protection acknowledged safety concerns in China's fleet of nuclear reactors, including potential complications from the sheer variety of reactors in operation.
The report, published on the ministry's website on Tuesday, acknowledged what nuclear experts have long argued: The relative variety of reactor models being used in China today makes nationwide safety standards and emergency-response mechanisms more complicated.
"The current safety situation isn't optimistic," the report said.
The Environment Ministry also said there were problems involved with uranium mining and that monitoring radiation was a challenge, though it didn't offer details.
In its report, the ministry recommended phasing out older nuclear reactors sooner, sharing and improving access to information, enhancing the research and development of nuclear safety and improving the handling of radioactive waste.