Title:
INITIAL LOADING REACTOR CORE
Document Type and Number:
Japanese Patent JP3260600
Kind Code:
B2
Abstract:
PURPOSE: To obtain an initial loading reactor core, in which thermal allowance can be improved and which corresponds to the increase of a burnup, by providing square- shaped cells constituted of four fuel assemblies having lowest mean enrichment and L-shaped cells constituted of three fuel assemblies having highest mean enrichment, arranging the L-shaped cells so as to be adjoined at the corners of the square shapes and setting the rate of the L-shaped cells at the specific rate or more of the whole.
CONSTITUTION: 764 fuel assemblies in all reactor cores are constituted of 244 fuel assemblies 1 in low enrichment, 176 fuel assemblies 2 in intermediate enrichment and 344 fuel assemblies 3 in high enrichment, and control cells B are constituted of four fuel assemblies in low enrichment. The high enrichment fuel assemblies 3 are charged in regions, in which peaking coefficients in the radial direction of the outer circumference of a reactor core are reduced, and regions except the periphery of the reactor core. The three high-enrichment fuels configure L-shaped cells A at that time, and the 96 high-enrichment fuels of the L-shaped cells are arranged at the corners of the cells B, and occupy 12.6% (10% or more) of the total number of fuels, Peaking coefficients in the radial direction of the high-enrichment fuels of the L-shaped cells are reduced because of the low combustion outputs of control cells, thus lowering the maximum linear heat ratings of the high-enrichment fuels.
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Inventors:
Hiroko Haraguchi
Yoshihiro Iwashita
Toshiro Yoshioka
Junichi Koyama
Akihiro Yamanaka
Mitsuya Nakamura
Katsumasa Haikawa
Yoshihiro Iwashita
Toshiro Yoshioka
Junichi Koyama
Akihiro Yamanaka
Mitsuya Nakamura
Katsumasa Haikawa
Application Number:
JP23099695A
Publication Date:
February 25, 2002
Filing Date:
September 08, 1995
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:
G21C5/18; G21C3/326; G21C5/00; G21C7/00; (IPC1-7): G21C5/18; G21C5/00
Domestic Patent References:
| JP5249270A |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)