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Evaluation of curve for tritium release rate into primary coolant for research and testing reactors

試験研究炉の一次冷却水におけるトリチウム放出率曲線の評価

Kenzhina, I. E.*; 石塚 悦男; 奥村 啓介; 竹本 紀之; Mukanova, A.*; Chikhray, Y.*

Kenzhina, I. E.*; Ishitsuka, Etsuo; Okumura, Keisuke; Takemoto, Noriyuki; Mukanova, A.*; Chikhray, Y.*

試験研究炉の一次冷却水中トリチウム濃度の増加が報告されている。トリチウム放出源を明らかにするために、JMTRとJRR-3Mの一次冷却水中のトリチウム放出率曲線を評価した。この結果、トリチウム放出は$$^{9}$$Beの(n,$$alpha$$)反応によって生成される$$^{6}$$Liに関係し、トリチウム放出曲線の評価結果から主にJMTR及びJRR-3Mのベリリウムから放出されていることが明らかとなった。また、照射時間が長くなるとトリチウム放出データのばらつきが認められ、JRR-3MよりJMTRの方が早期にばらつくことが明らかとなった。

Increase of tritium concentration in the primary coolant for research and testing reactors during reactor operation had been reported. To clarify the tritium sources, a curve of tritium release rate into the primary coolant for the JMTR and JRR-3M are evaluated. As a result, the tritium release rate is related with produced $$^{6}$$Li by (n,$$alpha$$) reaction from $$^{9}$$Be, and evaluation results of tritium release curve are shown as the dominant source of tritium release into the primary coolant for the JMTR and JRR-3M are beryllium components. Scattering of the tritium release rate with irradiation time were observed, and this phenomena in the JMTR occurred in earlier time than that of the JRR-3M.

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