The nightmare of PLA and CPC a nuclear Japanese state. Japan already has the tech for missiles and nuclear technology
Let us do some maths. Assume the Japanese plant, i.e. Rokkasho, is running at full capacity and some half a metric ton of plutonium is diverted or lost. Out of 500 kgs plutonium one can make some 27 bombs of size similar to one in Nagasaki. And if 10 of these are converted to primaries in thermo nuclear bombs then for 10 mega cities on mainland PRC and Taiwan, things will get very very hot. But compare the size of this arsenal with the known size of PRC's arsenal. Hysteria is a word which props up in the mind.“Japan has stockpiled large volumes of sensitive nuclear materials, including not only plutonium but also uranium, and that’s far exceeding its normal needs,” Chinese Foreign Ministry spokesman Qin Gang told reporters on March 11.
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“The Chinese have said they saw Japan plutonium as a weapons option and I think that many people in Japan do too,” said Frank von Hippel, a former White House national security adviser.
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Rokkasho is designed to separate as much as 8 tons of plutonium per year for reactor fuel. If diverted, that’s enough material to make hundreds of nuclear bombs like the one dropped over Nagasaki in 1945.
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About eight kilograms (18 pounds) of plutonium are needed for a single bomb.
Moreover Japan would have to build a bigger arsenal as compared to PRC due to the size of PRC. PRC need not build 100's of nuclear bombs as the target list is small w.r.t Japan. On the other hand Japan would have to build hundreds of bombs as the target size in PRC is massive.