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リフラックス冷却条件下の窒素ガス挙動に関するROSA/LSTF実験とRELAP5解析

ROSA/LSTF test on nitrogen gas behavior during reflux cooling and RELAP5 analysis

竹田 武司 ; 大津 巌 

Takeda, Takeshi; Otsu, Iwao

PWR事故時に蓄圧注入系の隔離失敗により窒素ガスが一次系へ流入する際に一次系の冷却材量等が減圧阻害現象に与える影響を調べるため、ROSA/LSTFを用いて、低圧・リフラックス冷却条件下での窒素ガス挙動に着目した個別効果実験を実施した。一次系圧力や蒸気発生器(SG)伝熱管群の流動挙動は、蓄積したガス量に依存することを明らかにした。また、RELAP5/MOD3.3コードによる事後解析を通じて、窒素ガス流入後の一次系圧力やSG伝熱管流体温度の予測に課題があることが分かった。

The primary coolant inventory may affect degradation in the primary depressurization due to failure of accumulator system isolation in PWR accidents. A separate-effect experiment with the ROSA/LSTF was thus conducted focusing on nitrogen gas behavior under reflux cooling condition at low pressures. The test showed primary pressure and flow behavior in steam generator (SG) U-tubes were dependent on amount of the gas accumulated. In addition, RELAP5/MOD3.3 code indicated remaining problems in the predictions of the primary pressure and SG U-tube fluid temperature after the nitrogen gas inflow.

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