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Patent Searching and Data


Title:
NUCLEAR FUEL PELLET
Document Type and Number:
Japanese Patent JPH0743487
Kind Code:
A
Abstract:

PURPOSE: To suppress the release of a fission gas at the time of high combustion by using a nuclear fuel pellet wherein a material having a higher thermal expansion coefficient than an oxide containing a fissile material is dispersed and precipitated in a crystal grain of the oxide and the average radius of the dispersed and precipitated material is a prescribed value or below.

CONSTITUTION: A material 2 having a size of about 100nm or below in terms of an average radius and a high thermal expansion coefficient is dispersed and precipitated in a crystal grain 1 constituted of an oxide containing a fissile material, and a pore 3 is dispersed around that material. When nuclear fuel pellets prepared in this way are charged in a reactor and combusted, gaseous FP (fission gas) or voids are produced with the combustion of a nuclear fuel material. However, the FP gas or the voids are caught on an interface of the crystal grain 1 and the material 2 having the high thermal expansion coefficient or in the pore 3 and the amount of the FP gas precipitated on the boundary of the crystal grain 1 is reduced. Thereby swelling of the pellets and PCI (pellet- cladding tube interaction) can be reduced.


Inventors:
Ishimoto, Shinji
Application Number:
JP1993000189549
Publication Date:
February 14, 1995
Filing Date:
July 30, 1993
Export Citation:
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Assignee:
NIPPON NUCLEAR FUEL DEV CO LTD
International Classes:
G21C3/62; G21C7/00; (IPC1-7): G21C3/62; G21C7/00
Attorney, Agent or Firm:
猪股 祥晃