Method and apparatus for performing preventive maintenance on th

Details Method and apparatus for performing preventive maintenance on th Method and apparatus for performing preventive maintenance on th

1995-03-24

1998-05-12

Stinson, Frankie L.

Cleaning and liquid contact with solids

Apparatus

For work having hollows or passages

134181, 134172, 134 24, B08B 902

Patent

active

057493847

ABSTRACT:
An apparatus preventive maintenance having a driving mechanism capable of driving a jet nozzle 24 to cause it to travel upward-and-downward, to rotate and to swing is settled on the top of a housing in the bottom portion of a reactor pressure vessel and on a hole for a fuel support piece, water pumped by a high pressure pump is spouted from a jet nozzle, and cavitation bubbles generated during the spouting are supplied to the positions to be treated for preventive maintenance, such as housings in the bottom portion of the reactor pressure vessel. Therewith, the residual tensile stress in the position to be treated is improved in a releasing direction by the energy generated by the collapsing of the cavitation bubbles.

REFERENCES:
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patent: 4163455 (1979-08-01), Herbert et al.
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patent: 5020183 (1991-06-01), Grant, Jr.
patent: 5036871 (1991-08-01), Ruggieri et al.
patent: 5080720 (1992-01-01), Titmas
23,820, Feb. 1981 EPX.

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