Published December 12, 1984 | Version v1
Patent Metadata-only

Nuclear fuel pellets

Creators

Description

Purpose: To prevent the rise of gas pressure in fuel rods, as well as decrease the stresses resulted in fuel cans for use in BWR-type reactors. Constitution: Sintered cylindrical fuel pellets containing fissionable materials are made to comprise metal oxides for adjusting the crystal grain size. The crystal grain size in the inner region of the pellet is made larger than that at the outer region. This enables to decrease the releasing rate of the gaseous nuclear fission products without reducing the creep strain velocity of the nuclear fuel pellets. As the result, the iodine concentration in the gap plenum can be decreased so as to prevent the occurrence of excess stresses in the fuel can. (Moriyama, K.)

Availability note (English)

Available from JAPIO. Also available from INPADOC.

Additional details

Publishing Information

Imprint Pagination
7 p.
IPC:
Int. Cl. G21C3/62.
IPC
Int. Cl. G21C3/62.
Patent number
JP patent document 59-220677/A/

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
17019698
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
BWR TYPE REACTORS; CORROSION PROTECTION; FISSIONABLE MATERIALS; FUEL CANS; FUEL PELLETS; FUEL RODS; GRAIN SIZE; OXIDES; SINTERING; SPATIAL DISTRIBUTION; STRESS RELAXATION
Descriptors DEC
CHALCOGENIDES; CRYSTAL STRUCTURE; DISTRIBUTION; ENRICHED URANIUM REACTORS; FABRICATION; FUEL ELEMENTS; MATERIALS; MICROSTRUCTURE; OXYGEN COMPOUNDS; POWER REACTORS; REACTOR COMPONENTS; REACTORS; SIZE; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS

Optional Information

Secondary number(s)
JP patent application 58-96695.