大亚湾核电站18个月换料非失水事故分析

大亚湾核电站由年换料改为18个月换料，燃料组件由AFA 2G改为AFA 3G，堆芯中子学参数发生了较大变化。因此，需要对许多事故重新进行分析。本文给出了大亚湾核电站18个月换料设计中非失水事故分析的主要假设和结果，并简要介绍了在18个月换料设计中应用的一些重要方法。分析结果表明，所有的事故均满足安全准则的要求。

GNPS 18-Months Fuel Cycles Non-LOCA Accident Analyses

The reload strategy is from 12 months to 18 month of GNPS,the fuel assembly changed from AFA 2G to AFA 3G and core nuclear data been changed,thus many accidents need to be reanalyzed. The Non-LOCA accidents are mainly including the main steam system depressurization,the steam system piping failure,loss of forced reactor coolant flow accident,reactor coolant pump shaft locked rotor,uncontrolled RCCA bank withdrawal from a subcritical condition,uncontrolled RCCA bank withdrawal at power,single RCCA withdrawal at power,rod drop,uncontrolled boron dilution and RCCA ejection.This report presents the main assumptions,analysis results and brief introduction of the main design method of non-LOCA accidents analysis in GNPS 18 months fuel cycles project. The analysis results demonstrate that all the criteria are respected.