介绍了CPR1000电厂目前使用的三维功率能力验证方法,从输入假设和计算过程两个方面入手,详细说明论证方法存在的保守性,得出输入假设的不确定性需要重新进行确定,分析过程中可以去掉1.04的保守因子; 计算过程也需要考虑实际运行区域,减少不可能出现的工况,即缩小分析区域。当换料设计的计算结果超限时,或者堆芯偏离核态沸腾比裕量不足时,可以通过减小运行区域和修改焓升因子的计算假设来挖掘裕量以满足安全要求。

The core power capability verifications is an important part of the core design safety verifications. The method used in currently published papers is a synthesis method combining 1D and 2D computations, which is very conservative. Three-dimensional method for core power capability verification is still conservative as it can not tell how much margin there is. This paper introduces the methodology of the power capability verifications of the plants designed in CPR1000. The conservative of the methodology was demonstrated from the input assumptions and the calculation process, from this paper. It is suggested that the uncertainty should be reconsidered with a factor of 1.04 being removed for the input data. The operation domain should be decreased, and cases that would never occur could be deleted in the calculation. When the deviation value from nucleate boiling ratio exceeds the limit, the limits of operating domain and the uncertainty of hot channel factor for specific enthalpy rise could be reanalyzed to meet the safety requirements.