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1. (WO1979000742) FUEL ASSEMBLY
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000742 International Application No.: PCT/JP1979/000038
Publication Date: 04.10.1979 International Filing Date: 19.02.1979
IPC:
G21C 3/328 (2006.01) ,G21C 7/00 (2006.01) ,G21C 3/32 (2006.01)
G PHYSICS
21
NUCLEAR PHYSICS; NUCLEAR ENGINEERING
C
NUCLEAR REACTORS
3
Reactor fuel elements or their assemblies; Selection of substances for use as reactor fuel elements
30
Assemblies of a number of fuel elements in the form of a rigid unit
32
Bundles of parallel pin-, rod-, or tube-shaped fuel elements
326
comprising fuel elements of different composition; Comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
328
Relative disposition of the elements in the bundle lattice
G PHYSICS
21
NUCLEAR PHYSICS; NUCLEAR ENGINEERING
C
NUCLEAR REACTORS
7
Control of nuclear reaction
G PHYSICS
21
NUCLEAR PHYSICS; NUCLEAR ENGINEERING
C
NUCLEAR REACTORS
3
Reactor fuel elements or their assemblies; Selection of substances for use as reactor fuel elements
30
Assemblies of a number of fuel elements in the form of a rigid unit
32
Bundles of parallel pin-, rod-, or tube-shaped fuel elements
Applicants:
Inventors:
Priority Data:
78/2891113.03.1978JP
Title (EN) FUEL ASSEMBLY
(FR) SYSTEME A CARBURANT
Abstract:
(EN) It is preferable, in a high burn-up degree range, that the output distribution curve in the axial direction of a reactor be flat. To this end, a mean infinite multiplication factor in an upper area in the axial direction of a core should be made lower than a mean infinite multiplication factor in a lower area, in view of the fact that volume coefficient has a distribution along the axial direction. It particularly becomes possible by lowering a mean enrichment of fuel located at the upper area with respect to a mean enrichment of fuel located at the lower area.
(FR) Il est preferable que, dans une plage de consommation elevee, la courbe de distribution de puissance dans le sens axial d"un reacteur soit horizontale. A cet effet, il faut rendre un facteur de multiplication infini moyen dans une zone superieure, dans le sens axial d"un noyau, inferieur a un facteur de multiplication infini moyen dans une zone inferieure tout en tenant comptant du fait que la distribution d"un coefficient d"un volume vide est axiale. Cela devient particulierement possible en abaissant un enrichissement moyen de carburant au niveau de la zone superieure par rapport a un enrichissement moyen de carburant au niveau de la zone inferieure.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
US4483818