Comprehensive inspection of the Type C leak test of the Steel containment in WWER 1000 Nuclear Power Plants

In WWER 1000 NPPs, leak tests of isolation valves are performed in accordance with testing procedures elaborated according to the design documentation for tests of individual groups of isolation valves. For each tested group of valves (or individual test of a valve), detailed procedures have been elaborated and evaluation criteria specified. Leak tests in general are performed using a unified method: the method of drop of pressure and temperature change measurement of gas in the volume between the valves, after pressurisation to a design pressure. A preliminary result of a type C test is satisfactory if the pressure drop in the tested volume does not exceed 3 kPa during a specified measurement period. The allowable leakage rate of the main personnel air lock established by the test of the air lock before the containment leakage rate test and converted to parameters of the containment leakage rate test is 25.000 Pa.m3s-1

کلیدواژه ها:

leak test ، containment ، air lock ، type C test