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ROSA/LSTF蒸気発生器伝熱管破断実験データに基づくRELAP5コード感度解析

Sensitivity analysis with RELAP5 code using ROSA/LSTF test data on steam generator tube rupture

竹田 武司 ; 大津 巌 

Takeda, Takeshi; Otsu, Iwao

PWR蒸気発生器(SG)伝熱管破断を模擬したROSA/LSTF実験のRELAP5/MOD3.3コードによる事後解析により、ループ間で異なる自然循環等主要現象は予測できたが、健全ループSG減圧後の破断ループSG二次側圧力等の予測に課題があることが分かった。また、感度解析を通じて、SG伝熱管ギロチン破断の本数や非常用炉心冷却系の高圧注入系の作動条件等が一次・二次圧力等に与える影響を明らかにした。

Post-test analysis with RELAP5/MOD3.3 code was performed for ROSA/LSTF test on PWR steam generator (SG) tube rupture. The code predicted such main phenomena as different natural circulation between two loops, while it indicated remaining problems in the predictions of broken SG secondary pressure after intact SG depressurization. The sensitivity analysis results found the number of SG tubes with double-ended guillotine break and actuation of high-pressure injection system of emergency core cooling system affect primary and secondary pressures and so forth.

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