COMMEN程序燃料元件精细模型的开发和验证

Development and Validation of Detailed Pin Model in COMMEN Code

COMMEN程序是中国原子能科学研究院开发的钠冷快堆堆芯严重事故分析程序,包含了热工水力学模块、结构模块以及中子学模块。本文介绍COMMEN程序的燃料元件精细模型,该模型对燃料芯块内部节点进行划分,从而详细描述了燃料元件棒的径向温度分布。使用含有燃料元件精细模型的COMMEN程序从反应性反馈方面对中国实验快堆的UTOP(无保护超功率)事故进行计算分析,并将SAS4A程序和COMMEN程序的计算结果进行对比验证。结果显示,燃料元件精细模型计算的燃料温度与SAS4A程序的计算结果符合很好,开发的COMMEN程序适用于UTOP事故分析。

The COMMEN code was developed by China Institute of Atomic Energy for the analysis of core severe accident in sodium‐cooled fast reactor , w hich consists of thermal‐hydraulics module ,fuel pin and structure module and neutronics module .T he detailed pin model in COMMEN code was described in this paper .In order to get detailed description of radial temperature distribution in the fuel pellet ,the node inside the fuel pellet was divided .Besides ,UTOP （unprotected top of power） accident of China Experimental Fast Reactor （CEFR） was calculated and analyzed in terms of reac‐tivity feedback with COMMEN code which contains the detailed pin model ,and the calculation results were compared between SAS4A code and COMMEN code to test and verify the detailed pin model . T he results show that the results of fuel temperature using the detailed pin model are in good agreement with the results using SAS 4A code , and the developed COMMEN code is suitable for UTOP accident analysis .