UO2 pellet and manufacturing method
Description
The present invention concerns an uranium dioxide pellet having a large crystal grain size. The grain size of the pellet is enlarged to increase the distance of an FP gas generated in the crystal grain to reach the grain boundary and, as a result, decrease the releasing speed of the FP gas. A UO2 powder having a specific surface area of from 5 to 50m2/g is used as a starting powder in a step of forming a molding product, and chlorine or a chlorine compound is added in such an amount that the chlorine content in the UO2 pellet is from 3 to 25ppm, in one of a production step, a molding step or a sintering step for UO2 powder. With such procedures, a UO2 pellet having a large crystal grain size can be prepared with good reproducibility. (T.M.)
Availability note (English)
Available from JAPIO. Also available from EPO.Additional details
Publishing Information
- Imprint Pagination
- 7 p.
- IPC:
- Int. Cl. G21C3/62; C01G43/025.
- IPC
- Int. Cl. G21C3/62; C01G43/025.
- Patent number
- JP patent document 7-174879/A/
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 27015250
- Subject category
- S22: GENERAL STUDIES OF NUCLEAR REACTORS;
- Resource subtype / Literary indicator
- Non-conventional Literature
- Descriptors DEI
- CHLORINE; CHLORINE COMPOUNDS; CONCENTRATION RATIO; FISSION PRODUCTS; FUEL CANS; FUEL PELLETS; GRAIN SIZE; POWDERS; SEALS; THERMAL CONDUCTIVITY; URANIUM DIOXIDE
- Descriptors DEC
- ACTINIDE COMPOUNDS; CHALCOGENIDES; CRYSTAL STRUCTURE; ELEMENTS; HALOGEN COMPOUNDS; HALOGENS; ISOTOPES; MATERIALS; MICROSTRUCTURE; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RADIOACTIVE MATERIALS; SIZE; THERMODYNAMIC PROPERTIES; URANIUM COMPOUNDS; URANIUM OXIDES
Optional Information
- Secondary number(s)
- JP patent application 5-320769.