CPR1000机组LOCA事故后燃料棒结垢的风险与分析

摘要

本文分析CPR1000机组在发生大破口失水事故(LOCA)后,燃料棒结垢的风险.在极端条件下,针对AFA-3G燃料棒不同结垢厚度和导热系数,利用ANSYS有限元稳态热分析模块,分析结垢对燃料棒导热的影响.计算结果表明:在保守的热边界条件下,燃料棒包壳表面最大温度为305.02 ℃,低于426.7 ℃.说明燃料棒处于最苛刻的结垢状况,同时热边界条件处于再循环阶段极限工况,CPR1000机组燃料棒导热情况依然是可接受的.%The risks about oxide, crud and chemical precipitate around the fuel rod during the post-LOCA of CPR1000 were analyzed. In an extreme condition, by using the steady-state thermal analysis module of ANSYS, based on the different thickness and the thermal conductivity of the fuel rod as being surrounded by concentric layers of chemical precipitate of AFA-3 G fuel assembly to analyses the effect on heat transfer. Under the conservative boundary conditions, the calculation results had showed that the maximum temperature of the surface of fuel rod cladding was 305.02 ℃,less than 426.7 ℃.In the extreme conditions, fuel rod thermal situation was still acceptable during the post-LOCA of CPR1000.