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核电厂严重事故工况下的仪表可用性评价一般采用曲线包络法。但由于曲线包络法存在一定的局限性,应用PSpice电路仿真方法对其进行补充,对电路仿真建模方案进行分析。根据严重事故工况环境现象及仪表失效相关数据库,结合核电厂仪表的特点,建立电路仿真模型,将仿真结果同三里岛事故仪表分析报告进行对比验证。结果表明,采用的建模方案具备合理性。
The assessment of instrument usability under serious accident conditions in nuclear power plants generally adopts the curve envelope method. However, due to the limitations of the curve envelope method, PSpice circuit simulation method is used to supplement it, and the circuit simulation modeling program is analyzed. According to the environmental conditions of severe accidents and instrument failure related database, combined with the characteristics of nuclear power plant instrumentation, the establishment of circuit simulation model, the simulation results with the Three Mile Island instrumentation analysis and comparison report. The results show that the modeling scheme adopted is reasonable.