控制棒驱动机构石墨密封组件设计与密封性能验证

Design and Sealing Performance Verification of Graphite Seal Assembly of CRDM

控制棒驱动机构(CRDM)检修及堆芯换料时都需要多次拆卸CRDM的耐压壳体,为解决现有耐压壳体Ω密封焊缝泄漏以及不能多次拆卸的问题,本文采用螺母压紧石墨环方案,利用石墨环的压缩回弹性能防止冷却剂泄漏,并设计一种石墨环密封组件实现快速拆卸;通过开展密封环压缩回弹测试、应力松弛测试以及密封组件泄漏率等密封性能测试试验对石墨环密封组件的密封性能进行验证。结果表明,本文设计的石墨环密封环组件满足设计要求,可以实现高温高压环境下的密封性能。

The pressure housing of CRDM needs to be disassembled many times during the maintenance of control rod drive mechanism(CRDM)and core refueling.In order to solve the leakage ofΩsealing weld of the existing pressure housing and the problem that it can not be disassembled many times,the scheme of pressing graphite ring with nut is adopted in this paper,the compression resilience of graphite ring is used to prevent coolant leakage,and a kind of graphite ring sealing assembly is designed to realize rapid disassembly.The sealing performance of graphite ring sealing assembly is verified by carrying out sealing performance tests such as compression rebound test of sealing ring,stress relaxation test and leakage rate of sealing assembly.The results show that the graphite ring sealing ring assembly designed in this paper meets the design requirements and can achieve sealing performance under high temperature and high pressure environment.