600 MW 压水堆安注箱设计研究

摘要

In this paper ,the TRACE and SNAP were used to establish two‐loop PWR thermal hydraulic system analysis model . The different accumulator design schemes were calculated and analyzed under LBLOCA .The safety injection effect was accessed according to simulation results by comparing peak cladding temperature of each design under LBLOCA .In the end ,the possible way to optimize design was found through this study .The research results show that the upper plenum and downcomer injection at the same time is more effective than the cold leg injection or the downcomer injection ,and the proper selection of initial accumulator pressure can lower peak cladding temperature and increase LOCA safety margin .%本文用美国核管会热工水力程序 TRACE 和图形化建模软件 SNAP ，建立了600 MW 两环路压水堆一回路和二回路热工水力系统分析模型，并对安注箱的各设计方案进行大破口失水事故（LBLOCA）模拟计算，通过对比各设计方案在 LBLOCA 事故下计算出的峰值包壳温度，研究安注箱在大破口失水事故工况下的安注性能，最后给出了优化的设计方案，并提出了可行的设计改进建议。研究结果表明，上腔室和下降段同时注入的方式较冷段注入和下降段注入更有效，且恰当地选取初始安注箱压力，可有效降低峰值包壳温度，提高 LOCA 裕量。