Abstract
The hydrogen meter sampling branch of 1st ring steam generator overflow pipe of CEFR secondary loop from 2016 to March 2020 has no access to sodium flow. The unavailability affects the way judges the small leakage in the upper part of the steam generator. After investigation, in March 2020, the sampling branch restored sodium flow, and the hydrogen meter returned to normal. In this paper, the cause analysis, troubleshooting process and solutions of hydrogen meter sampling branch are introduced, and the operation and maintenance experience of diffused hydrogen meter system is summarized, providing reference for the design, optimization, maintenance and personnel training of diffusion hydrogen meter in China experimental fast reactor (CEFR) and demonstration fast reactor.
