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非線形の温度フィードバック反応度に基づく臨界事故時の第1ピークエネルギーの近似式

Approximate expression of energy released at 1st power peak in a criticality accident based on non-linear temperature feedback reactivity

山根 祐一  

Yamane, Yuichi

瞬時の反応度添加による臨界事故が生じた場合に出力の第1ピークにおいて放出される核分裂エネルギーについて、温度フィードバック反応度の非線形な温度依存性を温度上昇の2次まで考慮した近似式を導出した。TRACY実験等で得られたデータに適用したところ、実験結果をよく再現することが明らかとなった。

For a criticality accident due to instantaneous insertion of reactivity, an approximate expression of the energy released during the 1st peak of the power profile was derived based on non-linear temperature feedback reactivity considering the 2nd order of temperature rise as an extension of Nordheim-Fuchs model. Its application to the data of TRACY experiment shows good agreement between the calculation and experiment.

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