Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Plural fuel segments or elements
Patent
1986-12-01
1988-07-12
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Plural fuel segments or elements
376441, 376443, 21912117, 21912166, 29906, 29723, 156645, G21C 334
Patent
active
047568780
ABSTRACT:
A marked reduction in the pressure drop of cooling liquid through a grid spacer of a nuclear fuel assembly is attained by convexly contouring the upstream (usually the lower) edges of the grid members. Preferably, they are made streamlined or semicylindrical. This can be done by first beveling and then etching them, by directing a stream of mixture of abrasive and an organic polymer against them, or by traversing an electron or laser beam along them at a power and velocity such as to cause local melting. A lesser improvement is secured by beveling alone. A still further improvement can be obtained by also tapering the downstream (usually upper) edges.
REFERENCES:
patent: 4081324 (1978-03-01), Flora
patent: 4492844 (1985-01-01), Kobuck
patent: 4541055 (1985-09-01), Wolfe
Toebes, et al.; "Journal of Basic Engineering", Dec. 1961; pp. 671-678.
Blevins; "Flow-Induced Vibration"; Van Nostrand, 1977; pp. 15-23 and 52-53.
Leon; "Flow-Induced Structural Vibrations", Symposium Karlsruhe (Germany) Aug. 14-16, 1972; pp. 318-332.
Handbook of Hydraulic Resistance; I. E. Idel'Chik; Translated by A. Barouch, M.Sc., Edited by D. Grunaer, P. E. et al; pp. 29-30; 305-306; 310-311; 330.
Brown Charles A.
King Peter P.
Patterson John F.
Yates Jack
Advanced Nuclear Fuels Corporation
Sharp Robert Keith
Ulbrich Volker R.
Walsh Donald P.
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