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高速実験炉「常陽」における放射性腐食生成物(CP)付着状況の測定; MK-III改造によるCP付着分布の変化

Measurement of corrosion products (CP) deposition in the experimental fast reactor Joyo; CP deposition distribution after MK-III modifications

伊藤 主税; 伊東 秀明; 石田 公一; 青山 卓史

Ito, Chikara; Ito, Hideaki; Ishida, Koichi; Aoyama, Takafumi

高速実験炉「常陽」1次冷却系機器・配管内の放射性腐食生成物(CP)の付着状況とその推移を把握するため、MK-III炉心への移行に伴う冷却系改造工事後のMK-III炉心第2サイクル運転終了後に、1次冷却系機器・配管表面の$$gamma$$線量率分布及び$$gamma$$線スペクトルを測定した。その結果、全体的なCP付着傾向はこれまでと大きく異なることはなく、運転時の温度が低下したコールドレグのうち主中間熱交換器から主循環ポンプまでの領域において若干付着しやすくなっている傾向が見られた。

In the experimental fast reactor Joyo, measurement for characterizing and predicting the deposition condition and the condition change of the corrosion product (CP) that is the major radiation source in equipments and piping of primary cooling system has been carried out regularly from early period of reactor operation. Cooling system modification work with the shift to the MK-III core was carried out after the last measurement that was carried out, and the main equipments such as intermediate heat exchangers were replaced. This measurement in this report was carried out at after the 2nd cycle operation of the MK-III core which started formal operation.

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