基于失流事故的SCWR—M安全系统优化

Optimization of SCWR—M Safety System Based on LOFA

混合谱超临界水堆(SCWR—M)是一个一次流通的单回路系统,因此失流事故(LOFA)是非常重要的安全分析事故。其非能动安全系统包括余热排出系统(ICS)、蓄压安注(ACC)、重力驱动冷却系统(GDCS)以及自动泄压系统(ADS)。本文首先用ATHLET—SC软件对自然循环进行建模和计算,并与实验结果进行对比,以验证ATHLET—SC适用于非能动安全系统的分析。随后,通过计算证明了安全释放阀(SRV)对于安全系统的必要性。最后,本文对安全系统的重要参数如ICS换热管数、ICS换热管直径、ACC初始压力以及GDCS管径等进行了参数敏感性分析,得到了一组优化的参数。将SRV以及优化参数应用于SCWR—M的LOFA计算,并与原结果进行对比,证明了本文提出的优化模型是有效的。

Mixed spectrum supercritical water reactor(SCWR-M)is a once-through cooling system,so loss of flow accident(LOFA)is very important in the safety analysis.The passive safety system includes isolation cooling system(ICS),accumulator injection system(ACC),gravity driven cooling system(GDCS),and automatic depressurization system(ADS).In this paper,firstly,natural circulation is simulated using the code ATHLET-SC.And the results are compared with the experimental data to demonstrate that ATHLET-SC is suitable for the calculation of passive safety system.Then,necessity of safety relief valve(SRV)is proved through calculation.Finally,the sensitivity analysis about key design parameters like ICS tube number,ICS tube diameter,initial ACC pressure and GDCS tube diameter is performed,through which,optimization parameters are obtained.SRV and optimization parameters are applied to the LOFA calculation of SCWR-M,and results are compared with original design parameters,which proves the optimization method proposed in this paper is effective.