| 摘要 |
A method of installing a jet pump beam includes, disposing an inlet mixer having one end portion inserted to a diffuser provided in a reactor pressure vessel and an other end portion communicated with a riser pipe disposed in the reactor pressure vessel between a pair of projecting portions of a transition piece provided to the riser pipe, separately inserting both end portions of a jet pump beam disposed above the inlet mixer into a groove formed in each of the pair of projecting portions, arching the jet pump beam by moving a center portion of the jet pump beam upward, pushing a screw member engaged with the arched jet pump beam against the inlet mixer, and measuring deflection amount of the arched jet pump beam when the screw member is being pushed against the inlet mixer.
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