Nuclear reactor spacer grid loading

Details Nuclear reactor spacer grid loading Nuclear reactor spacer grid loading

1986-06-11

1988-05-17

Bentley, Stephen C.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

376285, 376438, 376445, G21C 334

Patent

active

047449420

ABSTRACT:
Spacer grids for a nuclear fuel assembly are arranged in superadjacent groups having grid springs and opposing dimples which contact a fuel rod passing through a cell of the spacer grid with a selected spring force. As fabricated, the lowermost grid exerts the greatest initial spring force on the rod; intermediate grids exert a smaller spring force; and the uppermost grid exerts yet a lower spring force. The fuel rod is supported laterally while it is permitted to age expand axially with little axial compression resulting from the spring forces of the springs and dimples, whereby bowing of the rod is diminished.

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patent: 4224107 (1980-09-01), Delafosse et al.
patent: 4357298 (1982-11-01), Wolters, Jr. et al.
patent: 4474730 (1984-10-01), Hellman et al.

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