现象识别与分级表在高温气冷堆程序验证中的应用

Application of Phenomena Identification and Ranking Table in HTGR Code Validation

按照我国核安全法规的要求,应用于高温气冷堆(HTGR)事故分析的计算机程序,必须经充分验证。对于程序的验证,美国核管理委员会(NRC)在其发布的管理导则中推荐了一套通用的流程,该流程的一重要步骤就是现象识别与分级表(PIRT)的建立。本文回顾了PIRT方法的发展历程,介绍了NRC开发的九步法PIRT过程,对PIRT方法在HTGR程序验证中的应用进行了初步探讨。PIRT方法对程序的开发、评估和应用具有指导作用,因而是HTGR程序验证工作的前提步骤。九步法PIRT过程具有通用性和先进性,该方法完全适用于我国HTGR的PIRT工作。

According to the nuclear safety regulations of China, the computer codes used in the accident analysis of high temperature gas-cooled reactors （HTGRs） shall be ade- quately validated. Regarding the code validation, a general process was recommended in a regulatory guide issued by the U.S. Nuclear Regulatory Commission （NRC）. In that process, a cornerstone is the establishment of phenomena identification and ranking tables （PIRTs）. In this study, the PIRT development history was reviewed and the nine-step PIRT process developed by NRC was described. Additionally, the PIRT application in the HTGR code validation was preliminarily discussed. The PIRT method can guide the code＇s development, assessment and application, thus it is a prerequisite step of the HTGR code validation work. Since the nine-step PIRT is a general and advanced process, this process is completely applicable to the HTGR PIRT work of China.