论文部分内容阅读
钍基熔盐堆-固态燃料二号堆(Thorium Molten Salt Reactor-Solid Fuel 2,TMSR-SF2)是基于球床熔盐堆SF1(Solid Fuel 1)的小型模块化升级堆型,这种新概念堆结合了两者的诸多优点,目前已经完成了预概念设计,对其进行典型事故的分析与安全特性的评估成为当前重要研究内容。本文基于Relap5/MOD4.0程序,建立了反应堆事故模型,进行了全厂断电事故的模拟,分析了反应性、反应堆功率、冷却剂温度和燃料温度等关键参数的变化规律。结果表明,SF2在全厂断电事故中具备高度安全性,其中固有安全性发挥了重要作用。此外还进行了全厂断电事故伴生不同事件的后果比对以及不同温度反应性系数的敏感性分析,证明了直接反应堆辅助冷却系统(Direct Reactor Auxiliary Cooling System,DRACS)在事故前期余热排出能力的局限性,而依靠主泵可以最大限度利用熔盐堆的热惰性从而显著缓解熔盐堆堆芯过热。
Thorium-based Molten Salt Reactor-Solid Fuel 2 (TMSR-SF2) is a small modular upgrade reactor based on Solid Fuel 1 SF1. This new concept Heap combines the many advantages of the two, has now completed the pre-concept design, the analysis of the typical accident and the evaluation of safety features has become an important research content. Based on the Relap5 / MOD4.0 program, a reactor accident model was established and a simulation of a blackout across the whole plant was carried out. The variation of key parameters such as reactivity, reactor power, coolant temperature and fuel temperature were analyzed. The results show that SF2 has a high degree of safety in the whole plant blackout, of which intrinsic safety has played an important role. In addition, the comparison of the consequences of different events associated with the power failure of the whole plant and the sensitivity analysis of different temperature response coefficients were also carried out. The results show that the heat recovery capability of the DRAC system at the early stage of the accident However, relying on the main pump can make full use of the thermal inertia of the molten salt reactor and thus significantly reduce overheating of the molten salt reactor core.