“华龙一号”小破口事故充排研究  

Stduy on Feed and Bleed Based on SBLOCA of HPR1000

作　　者：詹经祥 郑云涛 黄树亮 杨长江 ZHAN Jingxiang;ZHENG Yuntao;HUANG Shuliang;YANG Changjiang(China Nuclear Power Engineering Co.,Ltd.,Beijing 100084,China)

机构地区：[1]中国核电工程有限公司,北京100084

出　　处：《核科学与工程》2024年第1期142-147,共6页Nuclear Science and Engineering

基　　金：风险指引的安全裕度特性分析技术研究,项目编号2018YFB1900300。

摘　　要：小破口叠加丧失辅助给水事故需要执行充排冷却措施以防止堆芯损伤。本文采用RELAP5程序建立了“华龙一号”分析模型,针对小破口叠加丧失辅助给水事故充排冷却进行计算分析。对影响充排冷却成功准则的一些关键因素,例如打开稳压器安全阀个数、辅助给水失效时间、安注流量等做了一系列敏感性分析。分析结果表明:为缓解该事故,操作员应及时打开三个稳压器安全阀执行充排冷却;辅助给水启动后30 min后丧失会大量增加充排冷却操作时间窗口;SG水装量、稳压器安全阀流量、中压安注流量等对充排冷却操作时间窗口影响较小。该分析结果能为风险指引的安全裕度分析方法研究提供参考。Small break LOCA with auxiliary feedwater failure needs to implement feed and bleed cooling measures to prevent core damage.In this paper,the RELAP5 is used to establish the analysis model of HPR1000,and analyze the feed and bleed cooling of small break LOCA with auxiliary feedwater failure.A series of sensitivity analysis on some key factors influencing the success criteria of feed and bleed cooling is carried out,such as the number of safety valves of pressurizer,the failure time of auxiliary feedwater,the safety injection flow rate,etc.The analysis results show that:in order to alleviate the small break LOCA with auxiliary feedwater failure,the operator should open three pressurizer safety valves in time to implement the feed and bleed cooling.When the auxiliary feedwater fails delay 30 minutes after start-up,the operation time window will be greatly increased.SG water inventory,pressurizer safety valve flow and medium pressure safety injection flow have little influence on the operation time window.The analysis results can provide a reference for the study of the risk informed safety margin analysis method.

关 键 词：“华龙一号” RELAP5程序 小破口事故 充排冷却 堆芯损伤 风险指引 

分 类 号：TL73[核科学技术—辐射防护及环境保护]