Measuring and testing – Vibration – By mechanical waves
Patent
1993-08-09
1995-10-24
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73625, 73628, 376249, 367104, G01N 2910, G01N 2926
Patent
active
054600456
ABSTRACT:
An improved method for repair of incore-instrumentation-housing and related defects in a nuclear reactor system involves three stages, each with ultrasonically assisted inspections. In the first stage, a defective incore housing is removed and the exposed area and aperture at the former location of the incore housing is ultrasonically inspected using an ultrasonic probe with a tiltable disk-shaped head that self-conforms to the local contour of the reactor vessel bottom. In the second stage, a weld buildup is formed. The reactor is then sealed and the weld buildup is machined to define an aperture therethrough. The weld buildup is then ultrasonically inspected with a second probe with a centering member that is stationary as the probe body is moved vertically relative to it. In the third stage, a J-prep is formed. A new incore housing is inserted through the weld buildup aperture. The new incore housing is welded at the J-prep. The J-weld is ultrasonically inspected using a third ultrasonic probe. The new incore housing is then connected to the incore guide tube with shrink couplings, and reactor activity can be restored.
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Berg David C.
Clark Jack P.
Kowdley Balasubramanian S.
Tung James C. S.
Finley Rose M.
General Electric Company
McGinness James E.
Williams Hezron E.
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