Method of providing a hold-down force upon a nuclear fuel assembly
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United States of America Patent
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Jul 9, 2013
Grant Date -
Jan 3, 2013
app pub date -
Jun 20, 2012
filing date -
Jan 25, 2010
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Abstract
A hold-down spring unit for a top nozzle of a nuclear fuel assembly. The hold-down spring unit is coupled to the upper end of the top nozzle of the nuclear fuel assembly. The hold-down spring unit includes a first spring which provides a hold-down force upon the nuclear fuel assembly under start-up conditions or hot full power conditions of a nuclear reactor, and a second spring which provides an additional hold-down force upon the nuclear fuel assembly under start-up conditions of the nuclear reactor. The hold-down margin under start-up conditions or hot full power conditions is reduced, thus enhancing the mechanical and structural stability of the nuclear fuel assembly.
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