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東海再処理施設の安全性確認に係る基本データの確認

Review of design data for safety assessment of Tokai reprocessing plant

大森 栄一; 須藤 俊幸; 清水 武彦; 駿河谷 直樹; 高谷 暁和; 中村 博文; 槇 彰

not registered; not registered; not registered; not registered; not registered; not registered; Maki, Akira

アスファルト固化処理施設火災・爆発事故の原因究明活動の結果、過去の施設についても最新の知見を取り入れて火災爆発等に対する安全性を確保すべきとの反省点が摘出された。そこで東海再処理施設について最新の知見やこれまでに蓄積した運転経験等を基に、火災爆発を中心とした施設の安全性を確認した。本報告書は、上記の安全性確認に使用した基本データの確認についてまとめたものである。設計基準燃料、放射能収支、機器内臓放射能量、実効線量当量の計算方法などについて、最新のコードやこれまでに得られた実データなどを使用して整理し、公衆の被ばく評価上重要な機器を洗い出した。また、整理されたデータを使用して放射線分解発生水素の検討を行い、火災爆発防止に係る改善項目を摘出し設備改善や運転要領書の改訂などの対応をとることとした。

Through the investigation of the cause of the fire and explosion incident at Bituminization Demonstration Facility of JNC Tokai Works, the lesson learned is that the safety assessment is necessary even for the licensed facilities by recent knowledge. The safety assessment has been conducted for the facilities in Tokai Reprocessing Plant by recent knowledge and operational experience. This report describes the review of the design data for safety assessment of Tokai Reprocessing Plant. The spent fuel inventory, the radio activity balance in the processes, the inventory contained in each equipment, and the evaluation method of public dose were evaluated with the recent data, the new calculation method and the data obtained through the plant operation. The important equipments were selected for safety assessment as for the public dose. The hydrogen generation from radiolysis of solution was also evaluated, and the hydrogen concentration in each equipment was kept lower than the flammable limit except several equipments that are to be improved.

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