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Decommissioning project feedback experience in the Japan Atomic Energy Research Institute

原所における廃止措置プロジェクトのフィードバック経験

柳原 敏; 立花 光夫; 宮島 和俊

Yanagihara, Satoshi; Tachibana, Mitsuo; Miyajima, Kazutoshi

日本原子力研究所では幾つかの原子力施設の廃止措置計画や関係する課題の検討が進んでいる。動力試験炉と再処理特別研究棟の廃止措置は将来の大型施設の廃止措置に向けた実証試験と位置づけられ、解体作業ではプロジェクトデータや知見の収集・整理が行われた。収集されたデータは、作業人工数,被ばく線量,廃棄物発生量に分類し、また、知見は安全性,廃棄物管理,作業性に分類して評価が行われた。これらのフィードバック経験は将来の廃止措置計画や規制にかかわる検討等廃止措置のさまざまな分野に反映されている。本報告書は原研における廃止措置作業の経験・知見をまとめたものである。

Several decommissioning projects are on going and studies on decommissioning issues are in progress in JAERI. The JPDR and JRTF decommissioning projects have been set up as demonstration programs for future decommissioning large nuclear facilities. Therefore, efforts have been made not only to dismantle the facilities but also to collect data and lessons learnt on dismantling activities. The data and lessons learnt have been analyzed to produce the database for future decommissioning projects by categorizing into manpower expenditure, radiation dose and waste generation in project data, and safety aspect, waste management, work efficiency considerations in lessons learnt. respectively. The feedback experience has been effectively contributed to various areas on decommissioning such as studies on regulatory systems and planning of other dismantling projects. This paper deals with decommissioning experience and lessons learned in JAERI.

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