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クリプトン広帯域検出器による排気監視

Discharge Monitoring by the Wide Range Radioactive Krypton Detector

森田 卓; 谷澤 輝明*; 森藤 将之; 高崎 浩司; 鈴木 秀樹*; 鈴木 一教; 小林 博英

Suguru, Morita,; Tanizawa, Teruaki*; Masayuki, Morifuji,; Takasaki, Koji; Suzuki, Hideki*; Suzuki, Kazunori; Kobayashi, Hirohide

高レベル放射性物質研究施設(Chemical Processing Facility,以下「CPF」という。)では,施設設備の改造更新工事を終えて、平成14年12月から平成16年3月まで先進湿式再処理試験が実施された。試験では排気筒から85Krが放出され,クリプトン広帯域検出器を用いたガスモニタにより放出量の測定評価を実施した。CPF排気モニタのガスモニタは平成6年度にGM検出器からクリプトン広帯域検出器に更新され、今回の先進湿式再処理試験での排気監視がCPFのクリプトン広帯域検出器による更新後はじめての$$^{85}$$Krの実測となった。今回,従来のGM検出器の仮設ガスモニタを設置し,測定値及びインベントリの比較を実施した。本報告では,先進湿式再処理試験におけるクリプトン広帯域検出器による放出監視についてまとめた。GM検出器等との比較評価の結果、クリプトン広帯域検出器による排気監視結果は妥当であることを確認した。

In the Chemical Processing Facility (CPF), after reconstruction was completed, the examination for advanced hydrometallurgy reprocessing was carried out from December 2002 to March 2004. In this examination,$$^{85}$$Kr were discharged from the stack. Discharge of$$^{85}$$Kr was measured and estimated by the wide range radioactive Krypton detector.GM Gas monitor of the CPF stack monitor was exchanged for the wide range radioactive Krypton detector in fiscal 1994. In discharge monitoring of this examination for advanced hydrometallurgy reprocessing,$$^{85}$$Kr gas were detected for the first time by the wide range radioactive Krypton detector of CPF. In this examination, the temporary gas monitor of the conventional GM detector was installed, and the result of measurement and inventory were compared.In this report the discharge of$$^{85}$$Kr is indicated by the wide range radioactive Krypton detector. As a result of comparative evaluation, it was confirmed that the discharge monitoring by the wide range radioactive Krypton detector was appropriate.

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