Study on Mitigating Capability of High-Pressure Safety Injection for Large Break LOCA in PWR
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摘要: 以西屋公司典型的三环路压水堆为参考对象,采用基于RELAP/SCDAPSIM程序开发的压水堆严重事故分析平台,对没有缓解措施的热段25 cm大破口失水事故进行了计算分析,详细研究了堆芯表面峰值温度分别达到1 100K、1 300 K和1 500 K时进行高压安全注射对大破口失水事故的缓解情况。结果显示,高压安全注射的时机对大破口失水事故的进程有着重要的影响,较早阶段的注水能够有效阻止堆芯熔化,较晚阶段的注水会恶化事故进程,加速堆芯熔化。Abstract: Talking a typical Westinghouse three-loop pressurized water reactor （PWR） as reference plant and using the PWR severe accident analysis platform based on RELAP/SCDAPSIM code, best estimate calculation of hot leg large break LOCA of 25 cm without mitigating measures is performed. The mitigating capability of high-pressure safety injection to the accident is studied when peak core temperature reaches 1 100 K, 1 300 K and 1 500 K respectively. The results show that the time of starting high-pressure safety injection plays an important role in the accident progression. Injection during early stage will prevent core from melting effectively. However, injection during later stage may deteriorate the progression of severe accident and result in accelerated melting.
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