Published September 30, 1994 | Version v1
Patent Metadata-only

Fuel assembly

Creators

  • 1. Toshiba Engineering Co. Ltd., Kawasaki, Kanagawa (Japan)

Description

A fuel assembly comprises a plurality of fuel rods arranged in a lattice. The plurality of fuel rods comprise longer fuel rods and shorter fuel rods having a shorter effective portion than that of the longer fuel rod. The effective portion of the shorter fuel rod is divided into upper and lower two regions. Assuming the concentration of fission material of fuel pellets filled in the lower region thereof as A, and the concentration of the fissile material of the fuel pellets filled in the upper region as B, the relation B ≥ A is defined. In this case, A is smaller than the average concentration of the fissile materials in a cross section of the assembly. The concentration of the fissile material of the fuel pellets filled in the effective portion of the longer fuel rod is uniform in a vertical direction. With such a constitution, the plenum of the shorter fuel rod is made shorter than the plenum of the longer fuel rod. Accordingly, improvement of fuel economy and reactor shut down margin due to increase of fuel inventories can be attained. (I.N.)

Availability note (English)

Available from JAPIO. Also available from EPO.

Additional details

Publishing Information

Imprint Pagination
7 p.
IPC:
Int. Cl. G21C3/326; G21C3/328.
IPC
Int. Cl. G21C3/326; G21C3/328.
Patent number
JP patent document 6-273557/A/

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
26047569
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
BWR TYPE REACTORS; CONCENTRATION RATIO; DISTRIBUTION; FISSILE MATERIALS; FUEL ASSEMBLIES; FUEL RODS; FUELS; INVENTORIES; LENGTH; REACTOR SAFETY
Descriptors DEC
DIMENSIONS; ENRICHED URANIUM REACTORS; FISSIONABLE MATERIALS; FUEL ELEMENTS; MATERIALS; POWER REACTORS; REACTOR COMPONENTS; REACTORS; SAFETY; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS

Optional Information

Secondary number(s)
JP patent application 5-63959.