METHOD FOR PRESSURE TEST ON BLIND PLUG SECTION OF HEAT TRANSFERRING PIPE OF HEAT EXCHANGER

摘要

PURPOSE:To confirm the sealed condition of a damaged heat-transfer pipe which is permanently sealed by means of a blind plug, by applying a pressure to the permanent and removable blind plugs from the outside to the inside of a pipe plate by using pure water having the same quality as the water-steam of a steam generator has. CONSTITUTION:A damaged heat-transfer pipe 2 is sealed with a permanent blind plug 23 and an excellent heat transferring pipe 2 with no damage is sealed with a removable blind plug 24 at the pipe plate 4' of a steam outgoing chamber 5. When a high-pressure pump 17 is actuated, a water pressure for compression test which is, for example, 1.5 times stronger than the water-steam pressure when an atomic power plant is operated is applied from the chamber 5 to the blind plugs 23 and 24 toward the barrel body 1 of a steam generator. In this case, a high-pressure side pressure gauge 12 does not indicate the pressure for compression test, if the sealed conditions by means of the blind plugs 23 and 24 are not perfect. Since the water leaks out from the damaged section of the damaged heat-transfer pipe 2 if the sealed condition by the blind plug 23 is not perfect, it can be confirmed that the sealed condition by the blind plug 23 is not perfect.