Repair of incore housings using ultrasonic examinations

Details Repair of incore housings using ultrasonic examinations Repair of incore housings using ultrasonic examinations

1992-04-09

1993-12-21

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376249, 376254, G21C 1900

Patent

active

052727343

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.

REFERENCES:
patent: 4440339 (1984-04-01), Tamai et al.
patent: 5118464 (1992-06-01), Richardson et al.
patent: 5145637 (1992-09-01), Richardson et al.
patent: 5196160 (1993-03-01), Porowski

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