Robert Windrem, “Japan Has Nuclear ‘Bomb in the Basement,’ and China Isn’t Happy,” 12 March 2014, NBC News

… But government officials and proliferation experts say Japan is happy to let neighbors like China and North Korea believe it is part of the nuclear club, because it has a “bomb in the basement” -– the material and the means to produce nuclear weapons within six months, according to some estimates. And with tensions rising in the region, China’s belief in the “bomb in the basement” is strong enough that it has demanded Japan get rid of its massive stockpile of plutonium and drop plans to open a new breeder reactor this fall. …

Japan now has 9 tons of plutonium stockpiled at several locations in Japan and another 35 tons stored in France and the U.K. The material is enough to create 5,000 nuclear bombs. The country also has 1.2 tons of enriched uranium. …

But pressure has been growing on Japan to dump some of the trappings of its deterrent regardless. The U.S. wants Japan to return 331 kilos of weapons grade plutonium – enough for between 40 and 50 weapons – that it supplied during the Cold War. Japan and the U.S. are expected to sign a deal for the return at a nuclear security summit next week in the Netherlands.

Yet Japan is sending mixed signals. It also has plans to open a new fast-breeder plutonium reactor in Rokkasho in October. The reactor would be able to produce 8 tons of plutonium a year, or enough for 1,000 Nagasaki-sized weapons. …

“I’ve had private discussions with China in which they ask, ‘Why does Japan have all this plutonium that they have no possible use for?’ I say they made have made a mistake and are left with a huge stockpile,” said Fetter, now a professor at the University of Maryland. “But if you were distrustful, then you see it through a different lens.” …

There are fears that if Japan opens the Rakkosho plant, it will encourage South Korea to go the same route as its neighbor. The U.S. and South Korea have been negotiating a new civilian nuclear cooperation pact. The South wants to reprocess plutonium, but the U.S. is resisting providing cooperation or U.S. nuclear materials. …

Still, even without a bomb, Japan has achieved a level of nuclear deterrence without building a bomb and suffering sanctions. That may be a more impressive achievement than actually building a bomb.

Read the full article here.