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钍基熔盐堆核能系统项目是中科院先导科技专项之一,其战略性目标是研发第四代熔盐冷却裂变反应堆核能系统。基于10 MWt固态燃料熔盐堆的系统设计,开发了适用于球床式反应堆系统的安全分析软件,并以高温气冷堆为对象对程序计算结果的准确性进行了验证。基于该软件程序,对固态燃料球床堆(Thorium Molten Salt Reactor-Solid Fuel,TMSR-SF)控制棒失控抽出事故进行了分析计算,研究了不同停堆限值及各停堆信号对事故的影响。计算结果表明,超功率停堆限值越高,出口温度限值越大,信号延迟时间越长,反应堆停堆越晚,堆芯功率和燃料最高温度越高。在TMSR-SF控制棒失控抽出事故下,燃料最高温度不超过860°C,远低于1 600°C的熔化温度限值。
Thorium-based molten salt reactor nuclear energy system project is one of the leading science and technology CAS, its strategic goal is to develop the fourth generation of molten salt cooling fission reactor nuclear energy system. Based on the system design of 10 MWt solid fuel molten salt reactor, a safety analysis software suitable for ball bed reactor system was developed. The accuracy of the program calculation results was verified by the HTGR. Based on the software program, the uncontrolled extraction accident of control rod of Thorium Molten Salt Reactor-Solid Fuel (TMSR-SF) was analyzed and calculated, and the effect of different shutdown limits and shutdown signals on accidents was studied . The results show that the higher the shutdown threshold, the larger the outlet temperature limit, the longer the signal delay, the later the reactor shutdown, and the higher the core power and fuel maximum temperature. Under the TMSR-SF control rod runaway accident, the maximum fuel temperature does not exceed 860 ° C, well below the melting temperature limit of 1 600 ° C.