高温剪断式触发吸收球非能动停堆装置可行性分析

发布时间：2018-02-20 05:02

本文关键词： 非能动停堆高温剪断式 Inconel 合金 Abaqus 断裂模拟　出处：《核技术》2017年07期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Inactive shutdown system is an important safety guarantee for nuclear power system under accident conditions. In order to ensure and enhance the safety of thorium based molten salt reactor nuclear power system, the existing inactive shutdown devices are compared and analyzed. In this paper, a thorium-based molten salt reactor high temperature shear trigger absorbing-ball inactive shutdown device is proposed. The thin-walled baffle, which is a high-temperature shear trigger structure, is designed by using the mechanical characteristics of Inconel 625 alloy in 650-700 掳C. The steady state and transient fracture simulation of the two-dimensional structure at different temperature under the accident condition are carried out by Abaqus software. The simulation results show that the thin-walled baffle will fracture within 4-10 s when the temperature is more than 650 掳C and continues to rise. When the temperature is increased to 670 掳C, the thin-wall baffle will not break. Therefore, the designed high-temperature shear trigger structure can be shearing reliably under the emergency condition. The safety of thorium-based molten salt reactor is further improved by ensuring the inactive trigger of the second shutdown system.
【作者单位】：中国科学院上海应用物理研究所嘉定园区;中国科学院大学;上海科技大学;
【基金】：中国科学院战略性先导科技专项(No.XD02001005)资助~~
【分类号】：TL364

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