05000259/LER-1981-016, Updated LER 81-016/01T-1:on 810501,during Test,Fire Pump Automatic Start Logic Found Inoperable.Caused by Wiring Removed from Terminal Points in Main Relay Panel 52,during Mod of Panel.Permanent Wire Replaced.Work Plan Revised

Updated LER 81-016/01T-1:on 810501,during Test,Fire Pump Automatic Start Logic Found Inoperable.Caused by Wiring Removed from Terminal Points in Main Relay Panel 52,during Mod of Panel.Permanent Wire Replaced.Work Plan Revised

ML20004D566
Person / Time
Site:	Browns Ferry
Issue date:	06/05/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004D560	List:
References
LER-81-016-01T, LER-81-16-1T, NUDOCS 8106090537
Download: ML20004D566 (2)

LER-1981-016, Updated LER 81-016/01T-1:on 810501,during Test,Fire Pump Automatic Start Logic Found Inoperable.Caused by Wiring Removed from Terminal Points in Main Relay Panel 52,during Mod of Panel.Permanent Wire Replaced.Work Plan Revised

Event date:
Report date:
2591981016R00 - NRC Website

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3 60 61 00CKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRl* TION AND PROBABLE CONSEQUENCES h l o l 2 l l During post-modification tests on a new sprinkler system. the fire oumo automatic I

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~ Tcnnessee Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2 3/24/81 LER SUPPLEMENTAL INFORMATION BFRO 259 / 81016 R1 Technical Specification Involved 3.11.A.l.b Reported Under Technical Specification 6.7.2.a(2)

Date of Occurrence 5/8/81 Time of Occurrence 1550 Unit 1, 2, and 3 Identification and Description of Occurrence:

Power (120V AC preferred) lifted to fire pump auto-initiation. The exact duration the circuit had been inoperable could not be determined. However, it is probable that the wiring was removed during the modification activity, making the duration 2 weeks ur less.

Conditions Prior to Occurrence:

Unit 1 refueling outage.

Unit 2 at 99%.

Unit 3 at 100%.

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

Reterminated power supply.

Apparent Cause of Occurrence:

Wiring was removed from terminal points in main relay panel 52 resulting in the interruption of power to the fire pump auto-start circuit. Although it could not definitely be determined how the wiring was removed, it is suspected that the wires were removed during performance of a molification in tne panel.

Analysis of Occurrence:

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

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Corrective Action

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workplan requiring the electricians to consu'; the cognizanc engineer prior Replaced permanent wiring immediately. Precautions have been added to the l

to removing any existing wiring.

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Failure Data:

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• Revision:

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