IAEA inspections apply only to non-nuclear weapons states. China is an acknowledged nuclear weapons state under the NPT and any monitoring it submits to is entirely voluntary. It can "national security" any nuclear installation and the IAEA will never see it again.Aren't these civilian reactors monitored by the IAEA and thus can't contribute their fissile material towards China's nuclear arms stockpile?
Furthermore, these PWRs are lousy for weapons grade fissile material because they use LEU and the plutonium they produce as waste is contaminated with isotopes that make it unsuitable for weapons. This monitoring/not monitoring issue applies to fast reactors like the CFR-600 coming online this year.