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Irradiation induced reactivity in Monju zero power operation

もんじゅ炉心確認試験における炉心反応度の照射依存性評価

高野 和也; 丸山 修平; 羽様 平; 宇佐美 晋

Takano, Kazuya; Maruyama, Shuhei; Hazama, Taira; Usami, Shin

2010年に実施した、もんじゅ炉心確認試験における炉心反応度の照射依存性について評価した。ゼロ出力で実施した炉心確認試験において、$$^{241}$$Puの崩壊に伴う反応度低下以外に、照射量増加に伴う正の反応度増加を確認した。照射依存の反応度増加は炉心確認試験開始から約1ヶ月($$sim$$10$$^{17}$$ fissions/cm$$^{3}$$)でほぼ飽和する。照射依存の反応度増加は、自己照射損傷に伴い蓄積した格子欠陥が炉心起動中の核分裂片照射により回復したことに起因すると仮定すると、運転前にMOX燃料に蓄積した自己照射損傷に伴う格子欠陥の約47%が回復したことに相当する。

Irradiation dependence of the core excess reactivity was investigated for the Monju system startup tests at zero-power carried out in 2010. The excess reactivity basically decreases with the $$beta$$ decay of $$^{241}$$Pu in zero-power operation. However, the excess reactivity little changed in the two month period of the startup tests, which suggests a positive reactivity insertion during the period. The investigated irradiation dependence shows that the positive reactivity increases with reactor operation and mostly saturates by the fission-dose attained during the Monju zero-power operation in a month ($$sim$$10$$^{17}$$ fissions/cm$$^{3}$$). The saturated positive reactivity is equivalent to approximately 47% of the initially accumulated self-irradiation damage recovery assuming the defects were recovered by the fission-fragment irradiation in the reactor operation.

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