Method and apparatus for use to exchange O-ring interposed betwe

Details Method and apparatus for use to exchange O-ring interposed betwe Method and apparatus for use to exchange O-ring interposed betwe

1978-11-29

1981-01-06

Cangialosi, S. A.

176 19R, 176 87, G21C 1900

Patent

active

042434840

ABSTRACT:
This invention concerns a method and apparatus for use to exchange an O-ring interposed between an in-core housing disposed at the lower end of a guide tube for an in-core monitor for monitoring the operation of a nuclear reactor and an in-core flange attached to the housing. The apparatus comprises a drain system adapted to be connected to the lower end of the flange for draining reactor water, a split cylindrical guide member adapted to be suspended from an upper grid located in a pressure vessel after removing the in-core monitor, an operating mechanism to be inserted into the guide member, the operating member being hung down from a platform of the reactor, and a tubular repairing tool secured to the lower portion of the operating mechanism, the repairing tool being provided with a valve member which is to be water-tightly engaged with a valve seat formed for the housing when the operating mechanism is lowered into the guide member.

REFERENCES:
patent: 3179266 (1965-04-01), Lemesle et al.
patent: 3183162 (1965-05-01), Chemin et al.
patent: 3206367 (1965-09-01), Peuchmaur et al.
patent: 3253995 (1966-05-01), Antonsen et al.
patent: 3567576 (1971-03-01), Issac
patent: 3567577 (1971-03-01), Brooks
patent: 3567578 (1971-03-01), Issac
patent: 3567579 (1971-03-01), Hubler et al.
patent: 3567580 (1971-03-01), Nakagawa et al.

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