F - Mech Eng,Light,Heat,Weapons – 28 – G
Patent
F - Mech Eng,Light,Heat,Weapons
28
G
122/1
F28G 9/00 (2006.01) F22B 37/48 (2006.01)
Patent
CA 2032756
W.E. 55,513 Abstract of the Disclosure Both a system and a method for removing sludge and debris from the interior of the secondary side of a nuclear steam generator is disclosed. The method comprises the steps of introducing a sufficient amount of water in the secondary side to submerge at least the tubesheet, generating a succession of shock waves in the water by means of pulses of pressurized gas to create shock waves that loosen the sludge and debris, and vertically flushing the interior of the secondary side by suctioning water off from the bottom portion of the steam generator while simultaneously forcefully spraying water from the top portion of the generator over the bundle of heat exchanger tubes in order to remove the sludge and debris loosened by the shock waves. To conserve the water used in the flushing operation, the water that is suctioned off from the bottom portion of the steam generator is filtered and de-ionized and re-introduced through hoses as the top portion of the generator which forcefully directs water downwardly through the bundle of heat exchanger tubes and against the tubesheet. The invention greatly enhances the effectiveness of pressure pulse, water slap and water cannon cleaning methods in the secondary sides of nuclear steam generators.
Auld Gregg Daniel
Franklin Richard Dale
Murray David Edward
Bereskin & Parr
Westinghouse Electric Corporation
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