METHOD FOR REMOVING SCALE, SLUDGE OR DEPOSIT FROM INSIDE OF SECONDARY SIDE OF HEAT EXCHANGER CONTAINER OR ATOMIC POWER STEAM GENERATOR

摘要

PROBLEM TO BE SOLVED: To discharge sludge, scale or deposit at a secondary inside of a steam generator or a pressurized water nuclear reactor out of the generator by separating it from a tube support plate. ;SOLUTION: The method for removing sludge, scale, or deposit from interior of a secondary side 5 of an atomic power steam generator comprises the steps of fully filling chemical cleanser water solution containing chemical cleanser having carrier agent and insertion agent in a secondary side 5, recirculating the solution via the secondary side 5, simultaneously recirculating to introduce pressurized pulse of gas into the solution by using a pressure pulse generator 39 and nozzle 41 to smooth the sludge, scale or deposit, passing the solution via a filter group 57 during the recirculating step to remove the sludge, and discharge the solution from the side 5 of the generator 1 to a waste liquid tank 61.;COPYRIGHT: (C)1998,JPO