Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Vessel monitoring or inspection
Patent
1992-12-04
1993-10-12
Nelson, Peter A.
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
Vessel monitoring or inspection
376245, 376252, 73620, 73621, 73622, 73624, 73629, G21C 17003
Patent
active
052532763
ABSTRACT:
A method of ultrasonic inspection of a reactor nozzle involves positioning emitter and receiver transducers on the exterior vessel wall near the nozzle. The emitter transducer is positioned and oriented so that it generates both primary longitudinal and transverse beams. The primary longitudinal beam is directed at the inner radius of the nozzle. The transverse beam is directed toward the interior vessel wall at an angle of about 30.degree. to the normal. Most of the energy of the transverse beam is converted to a secondary longitudinal beam also directed toward the inner radius of the nozzle. The receiver transducer is positioned on the exterior vessel wall about 4" from the emitter transducer so as to be able to detect reflections of both the primary and second longitudinal beams from any potential defect in the nozzle volume adjacent the inner radius.
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Krautkraemer, Joseph & Herbert. Ultrasonic Testing of Materials (New York: Springer Verlag, 4th ed.), pp. 31-34.
Bennett, William F. and Greer, Amos S. "Access Engineering and Other Related Problems of Nuclear Power Plants." ASMT Materials Evaluation, Sep. 1975, pp. 227-231.
NUREG-0619, BWR Feedwater Nozzle and Control Rod Drive Return Line Nozzle Cracking, U.S. Nuclear Regulatory Commission, p. 15.
Dummer Brad M.
Mortenson Steven C.
Beulick John S.
Carroll Chrisman D.
General Electric Company
Nelson Peter A.
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