基于确定性现实混合方法的中国300MWe双环压水堆NPP LBLOCA分析

Yuhan Li, B. Kuang
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摘要

冷却剂损失事故是压水堆核电站重要的限制设计基础事故之一。在中国,300MWe双回路压水堆核电站虽然面临延寿的挑战,但其安全分析工具和方法仍较为保守。这是为了保证电厂在过去几年的安全运行有足够的余量,但却以牺牲电厂的经济性和运行灵活性为代价。为了更合理、更真实地评价安全裕度,本文将确定性现实混合法(DRHM)引入我国300MWe双环压水堆核电站LBLOCA分析中,采用保守评价模型加最佳估计分析工具,量化电厂重要状态参数不确定性的影响。本文在对300MWe双环压水堆核电站双端断头台冷腿断口造成的LBLOCA的DRHM分析中,建立并验证了评估模型RELAP5- apk(保守的附录K物理模型加最佳估计系统分析代码RELAP5/MOD3)。在LBLOCA情景的暂态分析中,通过统计抽样和相应的计算,量化了电厂重要状态参数影响的不确定性。以包层峰值温度(PCT)指数为论证,衡量安全裕度,得到了包含95% PCT的抽样总体单侧置信度上限,置信度为95%。结果表明,与原始FSAR相比,实现了更大的PCT余量。这为延长机组寿命或提高机组功率提供了进一步的信心。
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A Chinese 300MWe Two-Loop PWR NPP LBLOCA Analysis Based on the Deterministic Realistic Hybrid Methodology
Loss of coolant accident (LOCA) is among the important limiting design basis accidents for a PWR nuclear power plant (NPP). In China, a 300MWe two-loop PWR NPP, although facing the challenge of life extension, still adopted rather conservative tools and methods for safety analysis. This is supposed to have guaranteed sufficient margin for safe operation of the plant during the past years, yet, at the expense of plant economy and operation flexibility. To evaluate the safety margin more reasonably and realistically, the mixed methodology of DRHM (deterministic realistic hybrid methodology) is introduced for LBLOCA analysis of the Chinese 300MWe two-loop PWR NPP in the paper, with which conservative evaluation model plus best estimation analysis tool is applied, and effects of uncertainty of important plant state parameters are quantified. In the DRHM analysis of postulated LBLOCA caused by double ended-guillotine-cold-leg break for the 300MWe two-loop PWR NPP in this paper, the evaluation model RELAP5-APK (the conservative Appendix K physical models plus best-estimate system analysis code RELAP5/MOD3) is developed and verified. And during the transient analysis of the LBLOCA scenario, uncertainty of the effects of important plant state parameters are quantified through statistical sampling and corresponding calculation. Taking the cladding peak temperature (PCT) index for demonstration to measure the safety margin, the single-sided confidence upper limit including 95% PCT of the sampling population with 95% confidence level is acquired. The resultant shows that a greater PCT margin is achieved compared with that in the original FSAR. This provide a further confidence for life extension or power uprate of the plant.
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