华龙一号SGTR事故缓解措施及事故处理

Mitigation and Treatment of Accidents in HPR1000 SGTR

华龙一号从设计上提供了蒸汽发生器传热管破裂(SGTR)事故后果的缓解措施,通过降低安注泵关闭扬程、增加快速冷却功能、增加辅助给水系统自动隔离自动调节功能、增加排污系统事故后排放功能等措施防止蒸汽发生器满溢,缓解了SGTR事故后果。本文首先分析SGTR事故发生原因,并对华龙一号SGTR事故缓解措施进行分析,并描述事故处理过程,最终验证上述事故缓解措施对防止破损蒸汽发生器满溢的有效性,确保满足华龙一号事故放射性后果验收准则。

HPR1000 provides mitigation measures for accidents in SGTR in the design. It can prevent SG overfill and mitigate SGTR accident by many means, such as decreasing the shutoff head of the safety injection pump and providing functions of fast cooling, automatic isolation and automatic control of auxiliary feedwater, and post-accident discharge of the blowdown system. The origin and mitigation measures for HPR1000 SGTR accidents are analyzed, and the process of accident treatment is described. Effectiveness of the mitigation measures to prevent SG overfill is verified, to satisfy the acceptance criteria for the radiological consequence of HPR1000.