Westinghouse Electric Corporation

Richard J Bodnar

Leonard R Golick

Charles H Roth, Jr

Jeffrey E Hydeman

David A Howell

Jeffrey L Slater

Robert S Sekera

John J Wilhelm

Bruce Rl Cox

A stud tensioner for tensioning the upright studs which secure the head to a reactor pressure vessel is suspended by a motor operated hoist from a motor operated trolley mounted on a circular rail supported above the studs. A single operator operates the motor operated hoist and motor operated trolley, and manually radially fine aligns the stud tensioner for engagement with a stud through a control handlebar. A pair of side-by-side switches adjacent a first hand grip at one end of the handlebar enable the operator to operate the trolley to move the stud tensioner left or right, while vertically aligned switches adjacent a second hand grip at the other end of the handlebar are used to operate the hoist to raise and lower the stud tensioner. Simultaneously, the operator can radially maneuver the stud tensioner by applying force through the handlebar. An adjustable mount allows the handlebar to be rotated about a horizontal pivot axis and locked into a selected angular position relative to the tensioner.

Apparatus for servicing a reactor such as tensioning reactor vessel head

Process and apparatus are disclosed for removing and replacing the hold down beams of fluid circulating jet pumps mounted in a nuclear reactor. The disclosed process and apparatus are operable from a position such as the refueling bridge remote from the reactor and while the refueling cavity surrounding the reactor is flooded with moderator fluid.

Process for servicing a jet pump hold down beam in a nuclear reactor

Apparatus for servicing a jet pump hold down beam in a nuclear reactor

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Monroeville, PA, United States of America

Richard J Bodnar