In its official submission to IAEA, INFCIRC/549/Add.1/17, Japan reported its plutonium holdings as of December 31, 2013. The INFCIRC/549 submission is based on the more detailed internal annual plutonium management report, made public in September 2014.

According to the INFCIRC/549 report, at the end of 2013 Japan had 4.4 (4.4 in 2012) tonnes of separated unirradiated plutonium at the reprocessing facilities, 2.9 (2.9) tonnes in fuel manufacturing process, and 3.1 (1.6) tonnes in unirradiated MOX fuel. Additional 0.4 tonnes of unirradiated plutonium is "held elsewhere."

In addition, Japan reported having 36.3 (34.9) tonnes of unirradiated plutonium outside of its territory.

Japan also declared 134 (133) tonnes of plutonium contained in spent fuel held at reactors sites and 27 (26) tonnes - in spent fuel at reprocessing facilities. Some material, less than 500 kg, is declared as held at other sites.