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Replacement of the criticality accident alarm system in the Tokai reprocessing plant

東海再処理工場における臨界警報装置の更新

眞田 幸尚  ; 根本 誠*; 鈴木 敬*; 川井 啓一*; 百瀬 琢麿 

Sanada, Yukihisa; Nemoto, Makoto*; Suzuki, Kei*; Kawai, Keiichi*; Momose, Takumaro

東海再処理施設における臨界警報装置更新に際し、検出器の配置位置を再設計した。設計のための最小臨界事故時の線量評価の結果から、保守的な設計条件を設定した($$gamma$$線検出器; 機器からの距離10m以下、140cm以下のコンクリート遮へい; 中性子検出器; 機器からの距離15m以下、60cm以下のコンクリート及び鉄遮へい)結果的に検出器は7個所設置することとした。本設計を実際の更新工事に反映した。

The purpose of this study is to show the design principle and the determination procedures for the adequate relocation of the CADs in TRP. When the alarm trip point was 2.0 mGy/h, it is possible to detect a criticality accident even under conservative conditions (i.e. $$gamma$$: 10 m distances from the equipment to the CAD and 140 cm concrete shield between them; neutron: 15 m distances and both 60 cm concrete shield and 60 cm steel shield). Consequently, it was found the seven CADs at these locations could monitor PCDF adequately. This study was reflected in the determination of the new CAD location.

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