Mockup Experiments on Investigate the Leak Rate Correlation between Mercury and Helium for the Mercury Target System of J-PARC

概要

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Checking the seal performance of the mercury piping network is very important for the mercury target system operation of J-PARC, and the test method for leaks using the pressure change measurement is preferable for this purpose because it can be carried out easily and precisely by measuring the pressure change, and it is free from the risk of mercury contamination. The piping network is pressurized by helium gas. Thus, the correlation between the helium leak rate and mercury leak flow rate was investigated experimentally by carrying out leak tests for helium and mercury with an identical mockup flange model. The results showed that the mercury leak flow rates of the experimental data were lower than those of the estimated value by 64% on average. It was also found that the threshold of the helium leak rate at which good seal performance for mercury can be obtained exists between 2.18×10−4 and 1.01×10−2 Pa.m3/s. This fact confirmed the sufficient safety margin of the mercury target system against the mercury leak, where 1×10−6 Pa.m3/s was adopted as the seal performance criterion.
社団法人日本原子力学会の論文
2009-12-01