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事故容错燃料(ATF)系统旨在当反应堆失去冷却后,提高核燃料及包壳的安全特性,在正常工况下相比现在的UO_2-Zr系统更好。通过凭借先进材料的特性,ATF系统会明显延缓事故进程,为采取缓解措施提供更大的时间裕度。本文通过分析采用ATF的典型压水堆系统大破口事故(LBLOCA)设计基准事故以及叠加安注系统失效的极限严重事故,初步评估ATF在事故下的性能。分析结果表明,相比UO_2-Zr,ATF能降低大破口设计基准事故下的包壳峰值,延长严重事故下堆芯发生熔化的时间,具有更好的事故容错性。
The Accidental Fault Tolerant Fuel (ATF) system is designed to improve the safety features of nuclear fuel and cladding when the reactor loses cooling, and is better than current UO_2-Zr systems under normal operating conditions. By virtue of the advanced material features, the ATF system significantly delays the incident and provides greater time margin for mitigation. In this paper, ATF’s performance under accident is primarily evaluated by analyzing the LBLOCA design ATF ATF benchmarking accidents and the extreme serious failures of overriding safety injection systems. The results show that compared with UO_2-Zr, ATF can reduce the peak value of the cladding under the large-break design basis accident and prolong the melting time of the core under severe accident, which has better fault tolerance.