Additional grid for a nuclear reactor fuel assembly, and assembly comprising an application thereof
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United States of America Patent
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-
Feb 2, 1993
Grant Date -
N/A
app pub date -
Jul 24, 1991
filing date -
Jul 24, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The additional mixing grid has no belt and comprises at least two sets of crossed plates that are fixed to each other at their cross-points, the plates being fitted with fins for stirring the coolant, and delimiting cells, some for receiving guide tubes and the others for receiving fuel rods. Each plate is provided, on each of the faces of those internal cells that receive the rods, with bosses that project sufficiently little to leave radial clearance for the rods passing through the cells and the projection of the bosses is proportioned relative to the projection of the fins so that in the event of bending vibration the rods come into contact with the bosses without reaching the fins, the lengths of the plates being such that the footprint of the additional grid is less than the footprint of the polygon constituting the virtual envelope of the rods.
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