05000259/LER-1981-042-03, /03L-0:on 810722,Unit 1 250-volt Main Battery 1 Removed from Svc.Caused by Need to Bypass Cracked Cell That Allowed Electrolyte Leakage & Electrical Path to Ground.C&D Type LCU-29 amp-hr Battery Cell Replaced

/03L-0:on 810722,Unit 1 250-volt Main Battery 1 Removed from Svc.Caused by Need to Bypass Cracked Cell That Allowed Electrolyte Leakage & Electrical Path to Ground.C&D Type LCU-29 amp-hr Battery Cell Replaced

ML20010C502
Person / Time
Site:	Browns Ferry
Issue date:	08/14/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010C499	List: 05000259/LER-1981-042, Forwards LER 81-042/03L-0 05000259/LER-1981-042-03, /03L-0:on 810722,Unit 1 250-volt Main Battery 1 Removed from Svc.Caused by Need to Bypass Cracked Cell That Allowed Electrolyte Leakage & Electrical Path to Ground.C&D Type LCU-29 amp-hr Battery Cell Replaced
References
LER-81-042-03L, LER-81-42-3L, NUDOCS 8108200144
Download: ML20010C502 (2)

LER-1981-042, /03L-0:on 810722,Unit 1 250-volt Main Battery 1 Removed from Svc.Caused by Need to Bypass Cracked Cell That Allowed Electrolyte Leakage & Electrical Path to Ground.C&D Type LCU-29 amp-hr Battery Cell Replaced

Event date:
Report date:
2591981042R03 - NRC Website

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• LICENSEE EVENT REPORT

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= VENT DESCRIPTION AND PROBABLE CONSEQUENCES h l 0 l a l I With unit cae in refueling outage, and units two and three at normal operation, l

the unit one 250 vo' t main battery number one was removed from service in order to l

l jo l3] l Inl4ll bypass a cracked cell.

(T.S. 3.9.B.7)

The 250 volt main batteries two and three l

There l

There was no danger to the health or safety of the public.

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I"iTs1 I were no previous similar events.

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43 44 47 CAUSE DESCRIPTION ANOCORRECTIVE ACTIONS h ji)oll A cracked cell allowed slight electrolyte leakage and an electrical path to ground.

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l Cracked cell was bypassed. The C&D (Eltra Corp) type LCU-29, size 8 HR CAP-2100 l

i i All other main battery cells l

l amp-hr battery cell will be installed upon delivery.

i 7 All main battery cells will be visually l

l have been visually inspected for cracks.

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1 inspected once per operating cycle.

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• Browns Ferry Nuchar Plant 6/04/81 LER SUPPLEMENTAI. INFORMATION 4

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~ BFRO-50 259 /

81042 Technical Specification involved 3.9.B.7 Reported Under Technical Specification

6. 7. 2.b. 2

• 3 ate due NRC: 8/21/81 Date of Occurrence 7/22/81 Time of Occurrence 2215 Unit 1

Identification and Description of Occurrence:

i Unit 1 250 volt ma h battery number 1 was removed from service in order to bypass a cracked cell wbich was allowing slight electrolyte leakage and an electrical path to ground.

I Conditions Prior to Occurrence:

l Unit I refueling outage.

Unit 2 at 99%.

Unit 3 at 97%.

l Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. _ Describe.

None Apparent Cause of Occurrence:

A cracked cell in 250 volt main battery number 1 had a 1-inch vertical crack at the top of one cell which was allowing slight electrolyte leakage and an electrical path to ground. Crack possibly caused by damage during shipment or installation.

Analysis of Occurrence:

There was no danger to the health or safety of the public, no release of activity, no daarse to the plant or equipment, and no resulting significant chain of events.

Major loads on the battery were transferred to other

- Corrective Action:

batteries iJEITe~the cracked cell was being bypassed. A new cell will be installed All other main battery cells have been visually inspected for upon delivery.

cracks. A program will be established to visually inspect all main battery cells once per operatir.g cycle.

Failure Data: None Retention:

Per' d - Lifetima; Responsibility - Document Contrcl Supervisor

• Revision :

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