压水堆核电厂自然循环对一回路卸压策略的影响

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Effect of Natural Circulation on RCS Depressurization Strategy in PWR NPP

School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240

摘要: 以我国秦山二期核电厂为研究对象,使用SCDAP/RELAP5程序建立了核电厂的自然循环模型。选取高压溶堆严重事故(TMLB’事故)为基准事故序列,分析了高压熔堆严重事故中自然循环的机理现象。通过计算在有无自然循环情况下一回路卸压措施的实施情况,对比分析了自然循环对一回路卸压策略的影响。结果表明,自然循环能有效延缓一回路卸压的启动时间和整体事故进程,但对一回路卸压的效果影响较小。
- 自然循环 /
- TMLB’事故 /
- 一回路卸压策略 /
- SCDAP/RELAP5程序
Abstract: The natural circulation model of Chinese Qinshan Nuclear Power Plant（NPP）Unit 2 is built using SCDAP/RELAP5 code.Selecting TMLB’ accident as the base sequence,this paper analyzes the natural circulation phenomena in high-pressure core melt severe accident.In order to study the effect of natural cir-culation on RCS depressurization strategy,the accident progressions of RCS depressurization with and with-out natural circulation are simulated,respectively.According to the results,the natural circulation can delay the initiation of RCS depressurization and the whole accident progression,but it does not evidently influence the results of RCS depressurization.
- Natural circulation /
- TMLB’ accident /
- Reactor Coolant System（RCS）depressurization strategy /
- SCDAP/RELAP5 code