Nuclear fuel spacer grid
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United States of America Patent
Stats
-
Dec 16, 1980
Grant Date -
N/A
app pub date -
Mar 30, 1978
filing date -
Mar 30, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A typical embodiment of the invention provides structural support for the grids in a nuclear reactor fuel assembly. Illustratively, the external surfaces of water rods or instrument tubes in a fuel assembly are provided with annular recesses. A spacer grid retainer is engaged within the recesses by means of spring loaded fingers on the retainer, in which the spring loading forces are greater than anticipated vibration forces to reduce fretting corrosion. Notches formed in the retainer secure the grid to the retainer, all in a manner that simplifies fuel assembly construction and restricts grid movement at lower cost.
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