Published January 27, 1989 | Version v1
Patent Metadata-only

Method of manufacturing UO2 pellet

Creators

Description

The present invention concerns a method of manufacturing UO2 pellets with less FP gas release and having fine structure for moderating PCMI. At first, oxide nuclear fuel pellets are placed in a sintering furnance and preliminarily sintered in a H2 gas atmosphere at 1400 - 1600 degC. In this step, sintering is progressed to about 90 % TD, by which closed cells are formed substantially completely. Then, when sintering is further advanced at an identical temperature in a CO2 gas atmosphere, growth of the crystal grains is advanced at the central portion of the pellets. Then, reductive heat treatment is applied at the identical temperature in a H2 gas atmosphere. As a result, pellets having a fine double structure with the larger grain size region being in the central portion and smaller grain size region in the outer periphery can be obtained. (I.J.)

Availability note (English)

Available from JAPIO. Also available from INPADOC.

Additional details

Publishing Information

Imprint Pagination
5 p.
IPC:
Int. Cl. G21C3/62.
IPC
Int. Cl. G21C3/62.
Patent number
JP patent document 64-25093/A/

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
20060877
Subject category
S22: GENERAL STUDIES OF NUCLEAR REACTORS;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
CARBON DIOXIDE; CRYSTALLIZATION; FISSION PRODUCTS; FUEL PELLETS; FUEL-CLADDING INTERACTIONS; GADOLINIUM; GRAIN SIZE; HYDROGEN; MIXED OXIDE FUELS; NUCLEAR POWER PLANTS; PELLETIZING; PLUTONIUM; REDUCTION; SINTERED MATERIALS; SINTERING; VERY HIGH TEMPERATURE
Descriptors DEC
ACTINIDES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; CRYSTAL STRUCTURE; ELEMENTS; ENERGY SOURCES; FABRICATION; FUELS; ISOTOPES; MATERIALS; METALS; MICROSTRUCTURE; MOLDING; NONMETALS; NUCLEAR FACILITIES; NUCLEAR FUELS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; POWER PLANTS; RADIOACTIVE MATERIALS; RARE EARTHS; REACTOR MATERIALS; SIZE; SOLID FUELS; THERMAL POWER PLANTS; TRANSURANIUM ELEMENTS

Optional Information

Secondary number(s)
JP patent application 62-179986.