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(21) (22)

Application

2000121273/06, 2000-08-09

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Start date

2000-08-09

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Actual filing date

2000-08-09

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Published

2002-12-27

(72)

Inventor

Rozhkov V.V.Chapaev I.G.Batuev V.I.Enin A.A.Bychikhin N.A.Sinikov Ju.G.Shmykov V.M.Akimova I.A.

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Zavod Khimkontsentratov"

NUCLEAR REACTOR FUEL ELEMENT Russian patent published in 2002 - IPC

Abstract RU 2195719 C2

FIELD: nuclear power engineering; manufacture of fuel assemblies for nuclear power reactors. SUBSTANCE: displacement of spacer grids over central tube during radiation growth and thermal expansion of fuel elements is confined within their displacement distance due to disposing stop rings on both sides of spacer grid which are secured with aid of bosses in central tube holes at 90 deg. between upper and lower bosses either side of each spacer grid, distance between spacer grid and lower edge of upper stop ring for bottom part of spacer grid being 0.45-05 of central tube diameter; for top part of each spacer grid distance between spacer grid and lower edge of upper stop ring is 0.95-1.0 of central tube diameter; three guide channels spaced 120 deg. apart and equally spaced from central tube carry safety rings on top part above spacer grids which function to limit maximal displacement distance of spacer grids during radiation growth and thermal expansion of fuel elements, distance between spacer grid and lower edge of safety ring in bottom part of spacer grid being 0.65-0.7 of guide channel diameter; for top part of spacer grids distance between spacer grid and lower edge of safety ring is 1.15-1.16 of guide channel diameter. Safety ring is made in the form of snap ring and attached to guide channel by spot welding. EFFECT: reduced cost and facilitated manufacture. 2 cl, 7 dwg

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RU 2 195 719 C2

Authors

Rozhkov V.V.

Chapaev I.G.

Batuev V.I.

Enin A.A.

Bychikhin N.A.

Sinikov Ju.G.

Shmykov V.M.

Akimova I.A.

Dates

2002-12-27—Published

2000-08-09—Filed