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Simplified model for highest cladding temperature evaluation in wire-wrapped fuel rod bundle under natural circulation decay heat removal

ワイヤーラップ型燃料集合体の自然循環崩壊熱除去時被覆管最高温度評価用簡易モデル

堂田 哲広 ; 大島 宏之; 上出 英樹 ; 渡辺 収*

Doda, Norihiro; Ohshima, Hiroyuki; Kamide, Hideki; Watanabe, Osamu*

ワイヤーラップ型燃料集合体の自然循環崩壊熱除去時被覆管最高温度を評価するための簡易モデルを開発した。大型炉271本ピンバンドルの外部電源喪失時の評価へ適用し、サブチャンネル解析モデルの結果とよく一致することを確認した。集合体内出力分布や燃料ピン配列といった不確かさについては境界条件で考慮した。本モデルの計算負荷はサブチャンネル解析モデルを用いた場合の約1000分の1であることから、多数の過渡解析を必要とする統計的評価も現実的な計算負荷で実施可能となる。

We have developed a simplified model for Highest Cladding Temperature Evaluation in Wire-wrapped Fuel Rod Bundle under Natural Circulation Decay Heat Removal. We have demonstrated the case of 271-pin fuel assembly in the external power loss event with the simplified model, and the results were in good agreement with the results by using the subchannel analysis code. Some uncertainties in the fuel assembly, e.g. the variations of fuel pin power and fuel pin position, were considered by setting boundary conditions. The computational cost of the simplified model was about one-thousandth compared with the subchannel analysis model. The simplified model can be applied without unrealistic computational cost to the statistical evaluation of safety criterion under natural circulation decay heat removal, which requires a large number of transient analyses.

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