FHR在全厂断电事故下对RVACS散热能力的要求

The requirement to the reactor vessel auxiliary cooling system of fluoride salt-cooled high-temperature reactors during station blackout

氟盐冷却高温堆(Fluoride salt-cooled High-temperature Reactor,FHR)是一种采用包覆颗粒燃料、高温熔融氟盐冷却剂的先进反应堆。部分FHR概念采用了反应堆容器辅助冷却系统(Reactor Vessel Auxiliary Cooling System,RVACS)导出事故下的堆芯余热。RVACS通过导热、对流换热、辐射换热等非能动过程,在事故发生时将堆芯余热排出至大气中。本文采用中国科学院上海应用物理研究所设计的10 MW FHR作为基准,利用RELAP5-MS程序,对其在全厂断电事故下的瞬态过程进行了模拟,验证了RVACS的余热导出能力。本文进一步研究了高反应堆功率情况下的全厂断电事故的瞬态过程,探讨了不同反应堆功率的FHR对RVACS散热能力的要求。

Background： Reactor vessel auxiliary cooling system（RVACS） is a passive residual heat removal system applied to thorium molten salt reactor-solid fuel（TMSR-SF1）. There are difficulties to use it to high-power reactor with its multifunction reactor vessel. To maximize vessel integrity, vessel should be minimized. Purpose： This study aims to verify the heat-discharge capability of the RVACS under station blackout accident（SBO）. Methods： With a 10-MW fluoride salt-cooled high-temperature reactor（FHR） designed by Shanghai Institute of Applied Physics of Chinese Academy of Sciences as the baseline design, the RELAP5-MS code was adopted to simulate the transients during a SBO. Results： A scope of RVACS power for heat dissipation of FHR under SBO is given by this study. Conclusion： The heat-discharge capability of the RVACS was verified.