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Excessive Leakage Measurement Using Pressure Decay Method in Containment Building Local Leakage Rate Test at Nuclear Power Plant
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 Title & Authors
Excessive Leakage Measurement Using Pressure Decay Method in Containment Building Local Leakage Rate Test at Nuclear Power Plant
Lee, Won Kyu; Kim, Chang Soo; Kim, Wang Bae;
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 Abstract
There are two methods for conducting the containment local leakage rate test (LLRT) in nuclear power plants: the make-up flow rate method and the pressure decay method. The make-up flow rate method is applied first in most power plants. In this method, the leakage rate is measured by checking the flow rate of the make-up flow. However, when it is difficult to maintain the test pressure because of excessive leakage, the pressure decay method can be used as a complementary method, as the leakage rates at pressures lower than normal can be measured using this method. We studied the method of measuring over leakage using the pressure decay method for conducting the LLRT for the containment building at a nuclear power plant. We performed experiments under conditions similar to those during an LLRT conducted on-site. We measured the characteristics of the leakage rate under varies pressure decay conditions, and calculated the compensation ratio based on these data.
 Keywords
Local Leak Rate Testing (LLRT);Pressure Decay Method;
 Language
Korean
 Cited by
 References
1.
Nuclear Safety And Security Commission, "Containment System Leakage Testing Requirements," NSSC Notice 2014-22

2.
American Nuclear Society, "Containment System Leakage Testing Requirements," ANSI/ANS56.8-1994, pp. 18-19