Subsidizing weapons would be incidental - no need for 150 reactors. US/USSR had <20 production reactors to make pu239 for 1000s of nuclear weapons. IIRC think current US projections of PRC nuclear proliferation is 1000-1500 weapons by 2030s, based on production from a few plants dedicated to nuclear production (404 and 821). If PRC wanted 1000s of nukes, it would be much more economical to build a few dedicated weapons-grade plutonium reactors, which won't be subject to civil regulatory concerns, i.e. multi year pause due to Fukushima. Parsimonious incentive for building 150 civilian reactors is because it's economically feasible there.