Title:
原子炉用燃料集合体およびスペーサ
Document Type and Number:
Japanese Patent JP4139223
Kind Code:
B2
Abstract:
Transverse vibrations of the pellet columns included in the fuel rods of fuel elements are limited by elastically mounting the fuel rod jacket tubes in the mesh of spacer grids. When the fuel rods are supported in this way, flexural vibrations of a higher order occur that lead to damage to the jacket tubes caused by fretting. These vibrations are the less dampened the more rigid the fixture of the fuel rod is. These vibration conditions are more easily excited and more strongly dampened when the pellet columns are more mobile, thereby removing vibration energy from the fuel element and avoiding damage caused by fretting. The mobility of the columns can be increased by increasing the gap between the pellet and the jacket tube, or by using constructions in which a torque M<=10 N mm on the fuel rod leads to a tilting angle phi>=0.1°. For this purpose, the fuel rod can be retained in a mesh in such a manner that a distance d0<=10 mm between the highest and the lowest point of contact of the fuel rod is maintained on the holding element of the mesh.
Inventors:
Starbell-Weinheimer, Jürgen
Len, Min Min
Len, Min Min
Application Number:
JP2002560141A
Publication Date:
August 27, 2008
Filing Date:
January 25, 2002
Export Citation:
Assignee:
Areva Empe Gezel Shaft Mitt Beschlenktel Haftung
International Classes:
G21C3/28; G21C3/33; G21C3/34; G21C3/344; G21C3/356
Domestic Patent References:
| JP56167297U | ||||
| JP50037357B1 | ||||
| JP1165992A | ||||
| JP53134191A | ||||
| JP58158585A | ||||
| JP60203892A |
Attorney, Agent or Firm:
Iwao Yamaguchi
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