UPDATE1: Japan, IAEA discussing large amount of unaccounted-for nuke materialsTOKYO, Dec. 15, Kyodo
Japan has started backstage talks with the International Atomic Energy Agency on the discovery of unaccounted-for or unreported enriched uranium and plutonium in large quantities of nuclear waste disposed of by Japanese facilities, hoping to ward off international criticism with an early report to the IAEA, senior government officials said Wednesday.
In October last year, nuclear substances, unaccounted for at that time, were found in waste at the Japan Atomic Energy Agency's Oarai Research and Development Center in Ibaraki Prefecture, the officials said.
The waste was disposed of before the 1977 effectuation of a safeguard agreement between Japan and the IAEA.
In a follow-up investigation, the government found some 2.8 kilograms of highly enriched uranium solidified with cement and a total of 636 grams of plutonium at the JAEA's Nuclear Science Research Institute in Tokaimura, Ibaraki.
The uranium is thought to have been imported from the United States as an experimental sample.
The science ministry, which oversees the JAEA, expanded the scope of investigation in August to about 250 facilities subject to the IAEA's safeguard program, finding unaccounted-for nuclear materials in waste at 14 facilities. Some 4 tons of low-enriched uranium at a private nuclear fuel company were among them.
The ministry also found radioactive substances in waste disposed of after the effectuation of the safeguard deal while looking into their possible presence at three electric power companies -- Chubu, Hokuriku and Chugoku -- as well as nuclear energy-related firms.
Under the IAEA's safeguards system, the international organization, tasked with promoting the peaceful use of nuclear energy, verifies the correctness and completeness of the declarations made by nations about their nuclear materials and activities. Nations are required to maintain accounting records on nuclear materials and report them to the IAEA to prevent them from being used in weapons.
Japan presented informal reports on investigation findings to the IAEA and started talks on them with the agency, the officials said, adding that 2.8 kg of highly enriched uranium and 4 tons of low-enriched uranium are seen as especially serious matters within the Japanese government.
Though the discovered nuclear materials will not directly pose a threat to international security through use in weapons or by terrorists, Japan may be criticized at the IAEA or other places if it fails to be fully accountable to international society, the officials said.
While Japan will present a safeguard report to the IAEA next year, the agency may not verify its declaration about nuclear materials and activities as correct and complete, they added.
==Kyodo
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