JT-60解体放射化物の収納保管管理; 保管容器等による放射化物の保管

Storage management of disassembled and radioactive components of JT-60 tokamak device; Storage of radioactive components by containers

西山 友和; 三代 康彦; 岡野 文範; 笹島 唯之; 市毛 尚志; 神永 敦嗣; 宮 直之; 助川 篤彦; 池田 佳隆; 逆井 章

Nishiyama, Tomokazu; Miyo, Yasuhiko; Okano, Fuminori; Sasajima, Tadayuki; Ichige, Hisashi; Kaminaga, Atsushi; Miya, Naoyuki; Sukegawa, Atsuhiko; Ikeda, Yoshitaka; Sakasai, Akira

臨界プラズマ試験装置(JT-60)では、超伝導コイルを用いるJT-60SAに改修するため、JT-60本体装置及び周辺設備を解体した。JT-60の解体品のほとんどが放射化物であり、大型構造物を除いた約1,100トン、約11,500点の解体品については、輸送用コンテナを利用した保管容器及び密閉容器と呼ばれる専用容器に収納し放射化物保管設備に保管した。これらの放射化物の運搬及び保管においては、1点毎に放射線障害防止法に定められた測定や記録などの管理が必要である。約11,500点にも及ぶ大量の放射化物の管理を確実に実施し、効率よく保管容器等に収納保管するために、バーコードタグ等を用いた管理方法や収納作業手順等を構築し収納保管作業を実施した。本報告書では、放射化物としてJT-60解体品を保管容器及び密閉容器に収納し、放射化物保管設備に保管する、一連の収納保管管理作業について報告する。

JT-60 tokamak device and the peripheral equipment were disassembled so as to be upgraded to the superconducting tokamak JT-60SA. The disassembled components were stored into storage and airtight containers at the radioactive control area. The total weight and the total number of those components are about 1,100 tons and about 11,500 except for large components. Radiation measurements and records of the radioactive components were required one by one under the law of Act on Prevention of Radiation Disease Due to Radioisotopes, etc. for the control of transport and storage from the radioactive control area to the other area. The storage management of the radioactive components was implemented by establishing the work procedure and the component management system by barcode tags. The radioactive components as many as 11,500 were surely and effectively stored under the law. The report gives the outline of the storage of JT-60 radioactive components by the storage containers.