Radioactive waste is stored at several locations. An interim storage facility for low- and intermediate-level waste and high-level waste has been in operation at Rokkasho-mura since 1992; spent fuel has also been stored there since 1999. Spent fuel is also stored at the reactor sites. A large-capacity storage facility for spent fuel is currently being constructed at Mutsu. Various research organisations also operate their own storage facilities for low- and intermediate-level waste. High-level waste is also stored at the research centre of JAEA (Japan Atomic Energy Agency) in Tokai.
A surface repository for low- and intermediate-level waste has been operating at Rokkasho-mura since 1992. Planning of an underground repository (around 100 metres deep) for decommissioning waste is currently underway. In 2008, the government assigned JAEA (Japan Atomic Energy Agency) the task of planning and implementing a surface repository for waste from medicine and research.
NUMO (Nuclear Waste Management Organization of Japan) is currently planning a geological repository for high-level waste. The aim is to select a site by 2025. Since April 2008, NUMO has also been responsible for the disposal of long-lived intermediate level waste (TRU waste) arising from reprocessing and from MOX fuel fabrication.
Rock laboratories in granite were operated in the former iron and copper mine at Kamaishi from 1988 to 1998 and the uranium mine at Tono from 1986 to 2003. New rock laboratories are now under construction at Horonobe (sediment) and Mizunami (crystalline).