| 摘要 |
A method and apparatus for servicing a nuclear reactor system is disclosed whereby a reactor vessel (10) filled with radioactive water from a refueling canal (16) and associated steam generator (30) and pump units (38) may be serviced simultaneously while the reactor is out for refueling. The apparatus includes a plug unit (A) and an installation assembly (B) for inserting a plurality of plug units into reactor vessel nozzles (40). Each plug unit (A) includes a radially expandable seal rings (50, 52) and secondary seal (58) carried by a tapered portion (56) which wedges the plug unit (A) into the nozzle (40) under hydrostatic pressure. Installation assembly (B) includes a pair of telescoping units (70) having a pair of telescoping arms (72) and (74) which moves axially in opposite directions to insert plug units (A) carried at the ends thereof into diametrically opposed nozzles. A brace (120) provides a reactionary force against which the nozzles may be pulled out in the case of difficulty. The method includes plugging the nozzles, draining the radioactive water from the piping system, and servicing the pump units (38) and steam generator (30) while the reactor vessel (10) is filled with water and being inspected and serviced. After all servicing is complete, the installation assembly is lowered into the water and utilized to remove the plugs. The reactor system may then be returned to operation without further delay in servicing the associated components of the reactor.
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