The Japanese government said Tuesday that the country's plutonium stockpile rose about 2.9 tons to 47.1 tons as of the end of last year, according to local media.

The newly added 2.9 tons included 2.3 tons generated through the spent fuel reprocessing outsourced to Britain and the controversial 640 kg that Japan possessed but not reported, said Japan's Kyodo News.

Reports in June exposed that Japan failed to include the 640 kg of unused plutonium in its annual report to the International Atomic Energy Agency in 2012 and 2013, raising concerns over that Japan's potential to develop nuclear weapons as the stockpile are allegedly weapons grade.

Of the 47 tons of plutonium Japan possesses, about 10.8 tons have been stored in the country and the rest portion kept in Britain and France, where spent nuclear fuel from Japanese power plants has been reprocessed, according to the report. Endi

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