Measuring and testing – Vibration – By mechanical waves
Patent
1990-02-07
1991-04-23
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
376249, G01N 2904
Patent
active
050091050
ABSTRACT:
An apparatus and process for the remote inspection for stress corrosion cracking of welded shut boiling water reactor shroud access cover plates is disclosed. The apparatus consists of a streamline housing having a top side with lugs for the attachment of lowering lines on either end of the housing. Medially of the streamline housing and projecting downwardly from the bottom of the streamline housing, there is provided a central rotating pedestal with a rubber base. The rotating pedestal and rubber base enable the entire housing to rest on and rotate relative to the pedestal and rubber base. A first motor interior of the housing rotates the housing at a bevel gear rigidly mounted to the central pedestal. A second motor rotates a threaded shaft driving a ball screw with an attached mount for an ultrasound transducer. The mount and transducer responsive to rotation of the ball screw traverse along the elongate dimension of the housing over an opening through the bottom of the housing. A focused ultrasound transducer passes above the metal to be inspected. This ultrasound transducer focuses the sound through the water at an oblique angle to and from the metal of the hatch cover plate for an ultrasonic examination for stress corrosion cracking.
REFERENCES:
patent: 4455872 (1984-06-01), Kossoff et al.
patent: 4470122 (1984-09-01), Sarr
patent: 4752435 (1988-06-01), Fenemore et al.
Clark Jack P.
Kowdley Balasubramanian S.
Patterson Peter M.
Perry Richard W.
Richardson David L.
Finley Rose M.
General Electric Company
Schroeder Robert R.
Williams Hezron E.
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