Application of Vacuum Hot Helium Leak Examination Technology for ITER Blanket Shield Blocks

Weiping Li, Guo-shuai Jiang, Wei Luo, Renjun Fang
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Abstract

The Blanket Shield Blocks is an important part of the International Thermonuclear Experimental Reactor (ITER). In order to ensure its sealing performance, each shield blocks needs to be taken a vacuum hot Helium leak testing. A method for high-sensitivity examination using a vacuum thermal helium leak test system is proposed in this paper. The shield blocks can remove its own impurity gas and increase the activity of Helium atoms by increasing the environment temperature. The examination sensitivity is improved by increasing the pressure difference between the inside and outside of the shield block. The sensitivity of this method can realize the helium leak test with the system sensitivity of 5 × 10−11 Pa·m3/s under the conditions of examination environment temperature of 250°C, ambient pressure of 1 × 10−5Pa, and products internal helium pressure of 4MPa. The results indicate that the technology has a high degree of automation and data traceability, which can avoid the influence of the product’s own outgassing on the examination, and has a high sensitivity to the examination of subtle air leakage.
真空热氦检漏技术在ITER包层屏蔽块上的应用
毯状屏蔽块是国际热核实验堆(ITER)的重要组成部分。为了保证其密封性能,每个屏蔽块都需要进行真空热氦泄漏测试。本文提出了一种利用真空热氦泄漏检测系统进行高灵敏度检测的方法。屏蔽块可以通过提高环境温度来去除自身的杂质气体,提高氦原子的活性。通过增大屏蔽块内外压差,提高检测灵敏度。在检测环境温度为250℃,环境压力为1 × 10−5Pa,产品内部氦气压力为4MPa的条件下,该方法的灵敏度可实现系统灵敏度为5 × 10−11 Pa·m3/s的氦气泄漏检测。结果表明,该技术自动化程度高,数据可追溯性好,可避免产品自身放气对检测的影响,对细微漏气检测具有较高的灵敏度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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