Title:
NUCLEAR FUEL ASSEMBLY
Document Type and Number:
Japanese Patent JP3103201
Kind Code:
B2
Abstract:
PURPOSE: To achieve strength reliability of a spacer by securing the strength of the spacer simultaneously with a reduction in pressure loss in a nuclear fuel assembly.
CONSTITUTION: In a spacer 4B positioned above the upper end of fuel rods of unfull length, round cells 1 are arranged at all positions corresponding to fuel rods 7 between bathtubs 3 facing each other and there is no round cells at the positions corresponding to the unfull-length fuel rods in other areas. The unfull-length fuel rods are arranged only below the positions void of the round cells of the spacer 4B. In other embodiments, the round cells are removed with a spacer 4D and a spacer 4E which have the round cells 1 existing at all positions corresponding to the fuel rods 7 between the bathtubs 3 facing each other so that the positions void of the round cells shift and these spacers 4D and 4E are arranged alternately in the axial direction of the fuel rods.
Inventors:
Satoshi Sugano
Junjiro Nakajima
Kenji Kanamori
Hajime Umehara
Shozo Nakamura
Tadashi Mizuno
Masatoshi Inagaki
Hajime Aoyama
Yasunori Bessho
Yasuhiro Aizawa
Shinji Sakata
Junjiro Nakajima
Kenji Kanamori
Hajime Umehara
Shozo Nakamura
Tadashi Mizuno
Masatoshi Inagaki
Hajime Aoyama
Yasunori Bessho
Yasuhiro Aizawa
Shinji Sakata
Application Number:
JP15949992A
Publication Date:
October 30, 2000
Filing Date:
June 18, 1992
Export Citation:
Assignee:
株式会社日立製作所
日立エンジニアリング株式会社
日立エンジニアリング株式会社
International Classes:
G21C3/344; G21C3/34; (IPC1-7): G21C3/344; G21C3/34
Domestic Patent References:
| JP5150068A |
Attorney, Agent or Firm:
Kasuga