控制棒组件置换策略优化研究

Optimization of Shuffling Strategy for Rod Cluster Control Assemblies

目前国内在运核电厂控制棒组件并未考虑置换策略,控制棒组件在堆内位置固定,由于控制棒组件功能不同导致承受辐照不均匀,控制棒吸收体材料在辐照下发生肿胀及蠕变,影响电厂安全运行。使用控制棒组件工程分析评价程序CRABE V3.3对CPR1000核电机组控制棒组件设计寿命进行评价,通过对比分析控制棒组件置换策略对寿命的影响发现,若采用置换策略,功率调节棒组件设计寿命可显著提高至目前寿命的2倍以上,温度调节棒组件设计寿命也有明显提高。因此,在充分考虑电厂大修的实际情况下,通过优化控制棒组件在机组内置换策略,增加控制棒组件使用年限,从而提高机组安全性及经济性。

Shuffling strategy is not considered for the control rod assembly in the operating nuclear power plants in China at present. The position of Rod Cluster Control Assemblies(RCCAs) is fixed with fuel assembly in the core, resulting in inhomogeneous irradiation, which will affect the safe operation and economic benefits of NPPs. The paper describes the shuffling strategies with the application of CRABE V3.3 which is used in lifetime analysis of CPR1000. By comparing, if a shuffling strategy is used, the design lifetime of the power control RCCAs significantly increased to 200% and temperature control RCCAs are also improved. RCCAs can be optimized by shuffling strategy considering the situation during refueling outage. RCCAs lifetime can be optimized and the safety of NPPs can be improved in this way.