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基于100 MW级小型自然循环铅冷快堆(SNCLFR-100)建立一回路冷却系统模型,利用RELAP5程序进行初始稳态运行验证。对有/无保护超功率失热阱并发、有保护超功率失热阱并发事故进行瞬态安全分析。结果显示:在有保护超功率失热阱并发事故过程中,停堆保护作用使反应堆处于安全状态;而对于无保护情况,由于反应性负反馈作用,500 s内反应堆实现自动停堆,冷却剂、包壳及燃料芯块温度均低于安全限值。瞬态模拟验证了该新型反应堆良好的自然循环特性与固有安全性。
A primary cooling system model was established based on SNCLFR-100 for a 100 MW small natural circulation lead-cooled fast reactor. The initial steady-state operation was verified by RELAP5 program. With / without protection of super-power loss of heat trap concurrent, with protection of super-power loss of heat trap accidental transient safety analysis. The results show that the reactor is in a safe state during the accident with the protection of super power loss heat sink, and the reactor is automatically shut down within 500 s due to the reactive negative feedback. , Cladding and fuel pellet temperature are below the safety limit. Transient simulation validates the good natural circulation characteristics and intrinsic safety of the new reactor.