05000368/LER-1981-021-99, /99X-0:on 810528,RCS Iodine Levels Increased, Indicating Failure of 20 to 30 Fuel Rods.Cause Being Investigated by Periscope Exam of Rods & Discharged Bundles. Leaking Assemblies Isolated,Reconstituted & Resipped

/99X-0:on 810528,RCS Iodine Levels Increased, Indicating Failure of 20 to 30 Fuel Rods.Cause Being Investigated by Periscope Exam of Rods & Discharged Bundles. Leaking Assemblies Isolated,Reconstituted & Resipped

ML20005A578
Person / Time
Site:	Arkansas Nuclear
Issue date:	06/22/1981
From:	Cogburn T ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20005A570	List: 05000368/LER-1981-021, Forwards LER 81-021/99X-0 05000368/LER-1981-021-99, /99X-0:on 810528,RCS Iodine Levels Increased, Indicating Failure of 20 to 30 Fuel Rods.Cause Being Investigated by Periscope Exam of Rods & Discharged Bundles. Leaking Assemblies Isolated,Reconstituted & Resipped
References
LER-81-021-99X, LER-81-21-99X, NUDOCS 8106300471
Download: ML20005A578 (2)

LER-1981-021, /99X-0:on 810528,RCS Iodine Levels Increased, Indicating Failure of 20 to 30 Fuel Rods.Cause Being Investigated by Periscope Exam of Rods & Discharged Bundles. Leaking Assemblies Isolated,Reconstituted & Resipped

Event date:
Report date:
3681981021R99 - NRC Website

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80 EVENT DESCRl TION ANO PROSASLE CONSEQUENCES h FJTil I During first cycle operation. RCS iodine levels increased to 4 2 pCi/cc 1 gg)) i indicating the presence of some 20 to 30 fr i fuel rods. During the i

e i first refueling outage the leaking assemblie., were identified by wet i

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7 leakina assemblies were isolated. of which 5 were to remain I I in for 1 or more additional cycles of copration.

These 5 assemblies werer o a o, I reconstituted and resipped to verify integrity.

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CAUSE DESCRIPflON ANDCORRECflVE ACTIONS h I The cause of the fuel rod failures is being investigated by periscope i

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LER 50-368/81-021/99X-0 June 22,1981 EVENT DESCRIPTION & PROBABLY CONSEQUENCES (CONT.)

were visually examined using underwater television equipment.

This examination revealed two instances of minor spacer grid damage. All damage was confined to intermediate zircalloy grid perimeter straps. This LER reported for information only.

DESCRIPTION AND CORRECTIVE ACTION (CONT.)

the spacer grid damage has been determined to be due to fuel handling during the refueling and is believed to be related to grid to grid interaction. Further investigation into fuel handling practices and protection provided by refueling equipment overload and underload trips is planned.

Corrective action will be based upon the results of this investigation.

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