ML20052A514

LER 82-005/01T-0:on 820312,insp of Fuel Assembly W/Experimental Zircaloy Spacer Grids Revealed That Grids Had Moved from Normal Position.Caused by Loss of Contact W/Mark B4 Grids Due to Weak Springs & Too Much Gap Growth

ML20052A514
Person / Time
Site:	Oconee
Issue date:	03/26/1982
From:	Norris J DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20052A510	List: ML20052A509 ML20052A514
References
LER-82-005-01T-01, LER-82-5-1T-1, NUDOCS 8204280412
Download: ML20052A514 (1)

Text

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EVENT OESCRIPTICN ANO PRCSASLE CONSECUENCES t o # 21 1 0n March 12, 1982, inspection of uel assembly with experimental zircaloy ,

, spacer grids revealed that the grids had moved upward from their normal

,,,.i gposition. There was no evidence of abnormal fuel behavior and the health g t o t si l and safety of the public were not affected. l lo is i I f Io e ,I I (

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CAusE cEscsiertCN ANoCcamECnvE AencNs 3,,,,;The experimental Mark BZ demon ration fuel assembly with zircaloy spacer i ,,,ggrids moved upward enough to lose grid to grid contact with adjacent Mark B4 ,

assembly grids due to grid springs not strong enough and too much growth gap

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