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非能动停堆系统是事故工况下核能系统的重要安全保障。为保证和增强钍基熔盐堆核能系统的安全性,通过对比分析现有的非能动停堆装置,本文提出了钍基熔盐堆高温剪断式触发吸收球非能动停堆装置。利用Inconel 625合金在650-700°C力学特性发生陡降的特点,对高温剪断式触发结构——薄壁挡板进行设计,并通过Abaqus软件对其二维结构在事故工况下不同温度时的响应状态进行稳态、瞬态断裂模拟。模拟结果表明,当设定温度超过650°C且持续升高时,薄壁挡板会在4-10 s内发生断裂;在非事故工况下,若温度异常升高到670°C后随即降低时,薄壁挡板不会发生断裂。因此,在紧急事故工况时,设计的高温剪断式触发结构能够可靠剪断,确保第二停堆系统非能动触发,进一步提高钍基熔盐堆的安全性。
The non-active shutdown system is an important safety guarantee for nuclear energy system under accident conditions. In order to ensure and enhance the safety of the thorium-based molten salt reactor nuclear energy system, a non-active shut-off device of thorium-based molten salt reactor high temperature shear-off triggered absorption ball was proposed by comparing and analyzing the existing passive reactor shutdown devices. Using Inconel 625 alloy steep drop at 650-700 ° C mechanical characteristics of the high-temperature shear-off trigger structure - thin-walled baffle design and Abaqus software for its two-dimensional structure at different temperatures under accident conditions Steady-state, transient fracture simulation of the response state. The simulation results show that the thin-walled baffle will break within 4-10 seconds when the set temperature exceeds 650 ° C and continues to rise. In the non-accident condition, if the temperature anomaly rises to 670 ° C, When lowered, the thin-walled baffle will not break. Therefore, in emergency conditions, the design of high-temperature shear-type triggering structure can be reliably cut off to ensure that the second shutdown system passive triggering to further improve the safety of thorium-based molten salt reactor.