【摘要】 高温熔盐泵是钍基熔盐仿真堆(Thorium Molten Salt Reactor-Solid Fuel,TMSR-SF0)一回路系统的关键设备,设计温度高达700°C,其结构完整性对反应堆安全运行至关重要。针对TMSR-SF0高温熔盐泵泵罐初始平封头设计方案应力过大问题,提出了三角形、单井形及双井形三种筋板优化方案,研究了筋板间距对双井方案泵罐应力的影响,制定了泵罐的最终设计方案,按照美国机械工程师协会(American Society of Mechanical Engineers,ASME)标准第III卷第5册对其进行了评定。结果表明:三种方案均可大幅降低泵罐应力水平,双井方案最优,单井方案次之,三角形方案最差;泵罐最终设计方案为双井方案,此方案可使泵罐应力由413.4 MPa下降至65.4 MPa,应力降幅高达84.2%,并通过了ASME标准评定。更多还原

【Abstract】 [Background] High temperature molten salt pump, the design temperature can go up to 700 °C, is one of the key equipment in the primary loop in the simulator of Thorium-based Molten Salt Reactor with Solid Fuel(TMSR-SF0). The structural integrity of the pump is crucial to the safe operation of the reactor. [Purpose] This study aims to reduce the load-controlled stress level of the molten salt pump tank of TMSR-SF0 to meet the evaluation requirements of American Society of Mechanical Engineers(ASME) BPV code. [Methods] Three different schemes of the reinforcing rib for the bottom flat head including triangular shape, #-shape, and dual-#-shape were proposed and analyzed to optimize the initial tank design. The influence of the reinforcing rib spacing on the stress of pump tank in the dual-# scheme had been studied, and the optimal combination of parameters was found. According to the results of above analyses, the final tank design scheme was obtained, and then evaluated in accordance with ASME BPV code section III, Division 5. [Results] The results show that all of the three schemes can significantly reduce the stress level of the pump tank, dual-#-shape scheme was the best, and then followed by the #-shape scheme and triangular shape scheme. [Conclusions] The final reinforcing rib design scheme for the bottom flat head of the pump tank is a dual-# scheme, which can reduce its stress from 413.4 MPa to 65.4 MPa, with a drop of 84.2%, and meet the stress assessment limit of ASME standard.更多还原