Patent ID: 7023949

Claim:
An in situ method of repairing a boiling water nuclear reactor having a jet pump assembly extending vertically through a hole in a bracket attached to a riser pipe, the jet pump assembly supported against horizontal movement by a plurality of screws extending from the bracket toward the jet pump assembly and by a wedge extending into the hole, the wedge moveably mounted on a vertically extending guide rod fastened to the jet pump assembly for urging the jet pump assembly toward the screws, the wedge having a vertically extending inner surface for contacting the jet pump assembly and an outer surface inclined relative to the vertically extending inner surface for contacting the bracket, comprising the steps of: while the wedge remains on the guide rod fastened to the jet pump assembly in the boiling water nuclear reactor, providing a spacer layer between the outer surface of the wedge and the bracket; and then lowering the wedge on the guide rod through the hole in the bracket until the spacer layer is between and in contact with the wedge and the bracket.