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2 195 721

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IPC

(21) (22)

Application

2000115190/06, 2000-06-13

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Start date

2000-06-13

(22)

Actual filing date

2000-06-13

(45)

Published

2002-12-27

(72)

Inventor

Rozhkov V.V.Chapaev I.G.Batuev V.I.Chinnov A.V.Zarubin M.G.Bychikhin N.A.Judina E.V.

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Zavod Khimkontsentratov"

METHOD FOR MANUFACTURING ZIRCONIUM-ALLOY SPACER GRID Russian patent published in 2002 - IPC

Abstract RU 2195721 C2

FIELD: nuclear power engineering; spacing apart fuel elements in reactor fuel assemblies. SUBSTANCE: assembled spacer grid is annealed at temperature and vacuum, and within time period sufficient for removing internal stresses without oxidizing cells and rim whereupon temperature is reduced to value sufficient for producing shielding oxide film on rim and cell surfaces of spacer grid; then spacer grid is cooled down in oxidizing medium. Annealing is made at 580^°±15^°C for minimum 180 minutes at residual pressure of 2×10^-3 Hg, then temperature is reduced to 500^°±20^°C and shielding oxide film is produced using atmospheric air as oxidizing medium. EFFECT: enhanced reliability and flexibility of spacer grids, reduced forces required for press-fitting fuel elements in them and reduced damage probability to fuel elements. 3 cl

Similar patents RU2195721C2

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RU 2 195 721 C2

Authors

Rozhkov V.V.

Chapaev I.G.

Batuev V.I.

Chinnov A.V.

Zarubin M.G.

Bychikhin N.A.

Judina E.V.

Dates

2002-12-27—Published

2000-06-13—Filed