摘要
应用MELCOR1.8.6程序对严重事故试验PHEBUS-FPT1进行了模拟分析。通过对棒束毁损过程中涉及的燃料棒过热、锆水反应、裂变产物释放和迁移、燃料熔融坍塌等现象和机理的建模计算,得到的结果和趋势与试验测量值进行了比较分析。分析结果表明:计算得到的棒束失效过程中发生重要事件与试验值较吻合;表征严重事故过程的重要现象——锆水反应所产生的氢气趋势,计算值与试验值比较一致;棒束栅元单一控制体划分,会使得计算得到的燃料峰值温度等表征严重事故来临时间晚于试验值;用CORSOR-M模型预测得到的大部分裂变产物核素释放总量要低于试验测量值,并且该模型较高的估计了氧化热对Xe、CsI、、Te等易挥发核素释放的影响。
In this paper, simulation and analysis on FPT1 test of experiment facility PHEBUS is performed with application of MELCOR 1.8.6 code. In the simulation, severe accident phenomena such as fuel overheating, zircalloy-water reaction, release and migration of fission products, melting and relocation of failed fuel are modeled and predicted by the code. The results and trends from the calculation are compared with the test measurements. The analysis indicated that： major events from simulation during failure of bundle are generally consistent with corresponding test results; calculated and test results agree well for the hydrogen generation, which occurs in the severe accident progress as an important phenomenon. A simplified control volume nodalization of bundie, may lead to late coming of predicted peak fuel temperature compared to that of measured; The released masses of most fission products calculated by using CORSOR-M model are less than those of test measurements. According to the analysis, influence of oxidation heat on release of volatile elements, i.e. Xe, Cs, I , Te, is a bit overestimated in the code modeling.
出处
《核科学与工程》
CSCD
北大核心
2009年第3期253-259,共7页
Nuclear Science and Engineering
