Probably on par with how the other safety stuff in the country is. Bad, not talked about, and actively suppressed if discovered.

I've got no reason to believe they're doing anything dangerous. I found this piece which indicates that they did a review in the wake of Fukushima. Sounds like things were adequate but they also found things to improve. Do you have reason to believe China is not taking safety seriously in there nuclear energy program?

Following Fukushima, however, Beijing immediately suspended approval of all new nuclear power projects while it undertook a comprehensive safety review of existing and under-construction nuclear power plants, as well as research reactors and fuel cycle facilities, and developed its Twelfth Five Year Plan for Nuclear Safety. In June 2012, after gaining approval of the State Council in principle, the National Nuclear Safety Administration released drafts of the Nuclear Safety Plan (Chinese here) and the “Report on Safety Inspection of National Civilian Nuclear Facilities” (Chinese here) for public comment.

As discussed in the Safety Inspection report, the safety inspection took over 9 months and covered 11 areas of safety, including site selection and external event evaluation; flood and earthquake resistance capacity; extreme natural disaster prevention and protection; electricity blackouts and emergency plans; severe accident prevention and mitigation; environmental monitoring systems; and emergency response system effectiveness.

The report concluded that operating reactors “basically fulfill” China’s nuclear safety laws and regulations and the International Atomic Energy Agency’s most recent standards, that they have the capacity to respond to design-basis accidents and severe accidents, and that safety risks are under control. However, in spite of these conclusions, the inspection report and nuclear safety plan also identified areas for improvement. In particular, the nuclear safety plan lays out short- (by the end of 2012), mid- (by the end of 2013) and long-term (by 2015) tasks to strengthen safety for operating and under-construction plants, research reactors and fuel cycle facilities.

China moves to strengthen nuclear safety standards and moderate the pace of its nuclear power development

The only reported incident has been from one of the European designed EPR reactors, which had a faulty fuel cladding that released some radioactive steam within the system.

Other than that, they've been pretty good. The main reason the reactors are safe is because we've designed them, especially with post-Fukushima improvements, to have a lot of passive safety built in by default.

Post-Fukushima improvements include, in addition to baseline passive nuclear safety, things like being able to take direct strikes from artillery without melting down. That's also in addition to the natural disaster proofing we've done for earthquakes, floods and tsunamis. We've generally done a good job of over-engineering our reactors so that we can minimize any potential disasters.