Published December 7, 1993 | Version v1
Patent Metadata-only

Fuel assembly

Creators

Description

A fuel assembly comprise long fuel rods and short fuel rods arranged in a lattice in a channel box and a water rod disposed to the central portion thereof. The content of the fissile materials of fuel pellets near the upper end of the short fuel rods is made lower than the content of fissile materials in other portions of the fuel pellets. That is, the enrichment degree for uranium 235 of the fuel pellets is set at 3.5wt% near the upper end, while the enrichment degree of uranium 235 for the fuel pellets is set to 4.2wt% in other portions of the fuel pellets. This can suppress a power spike at the top end of the short fuel rod to improve the mechanical integrity of the short fuel rod and obtain a fuel assembly of high integrity corresponding to high burnup degree. (I.N.)

Availability note (English)

Available from JAPIO. Also available from EPO.

Additional details

Publishing Information

Imprint Pagination
8 p.
IPC:
Int. Cl. G21C3/326; G21C3/328.
IPC
Int. Cl. G21C3/326; G21C3/328.
Patent number
JP patent document 5-323071/A/

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
25055845
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
BWR TYPE REACTORS; CONCENTRATION RATIO; FISSILE MATERIALS; FUEL ASSEMBLIES; FUEL INTEGRITY; FUEL PELLETS; FUEL RODS; LENGTH; PWR TYPE REACTORS; THERMAL SPIKES; URANIUM 235
Descriptors DEC
ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; DIMENSIONS; ENRICHED URANIUM REACTORS; EVEN-ODD NUCLEI; FISSIONABLE MATERIALS; FUEL ELEMENTS; HEAVY NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MATERIALS; MINUTES LIVING RADIOISOTOPES; NUCLEI; POWER REACTORS; RADIOISOTOPES; REACTOR COMPONENTS; REACTORS; SPONTANEOUS FISSION RADIOISOTOPES; THERMAL REACTORS; URANIUM ISOTOPES; WATER COOLED REACTORS; WATER MODERATED REACTORS; YEARS LIVING RADIOISOTOPES

Optional Information

Secondary number(s)
JP patent application 4-127658.