核电站电气柜地震易损性分析的一般方法概述与相关问题讨论

General Method and Related Issues of Analysis on Seismic Fragility of Electronic Control Cabinet in Nuclear Power Plant

基于若干实际评估的经验,概述了核电站安全评估中对电气柜进行地震易损性分析的一般方法,包括获取分析的前提条件、对电气柜进行保守确定性分析以辨识其潜在失效模式、对最可能失效模式进行确定性分析以确定危险点、以及对各危险点进行不确定性失效分析以获得电气柜的地震易损度等。然后从评估经验的角度,介绍了评估分析中遇到的一些问题及其处理方法,包括对评估前提条件缺失的解决方法、对确定性和不确定性参数值的取定方法、以及对电气柜螺栓连接与焊接连接的比较。这些方法有助于评估分析人员更加容易地开展相关评估工作,并合理解决评估中可能出现的问题。

Based on practical assessments,the general method of analyses on seismic fragility of the electronic control cabinets were introduced which consist of getting the premise conditions of analysis,performing qualitatively determinacy analyses to realize the prospective failure modes,performing determinacy analyses to the most risk failure mode to determine the most risk part,and obtaining the seismic fragility degree of the most risk electronic control cabinet through the non-determinacy analysis.Then as experience,some encountered issues and related dealing methods were discussed,including how to replenish the lost premise conditions and choose values of the determinacy and non-determinacy parameters.Meanwhile,the differences between bolt connection and weld connection of the electronic control cabinets were compared in the assessment.These methods made the assessment easier to be carried out and related issues easier to be solved.