05000259/LER-1981-016-01, /01T-0:on 810501,fire Pump Automatic Start Logic Found Inoperable During post-mod Tests.Caused by Wiring Being Removed from Terminal Points in Main Relay Panel 52. Permanent Wiring Replaced

/01T-0:on 810501,fire Pump Automatic Start Logic Found Inoperable During post-mod Tests.Caused by Wiring Being Removed from Terminal Points in Main Relay Panel 52. Permanent Wiring Replaced

ML19350D838
Person / Time
Site:	Browns Ferry
Issue date:	05/12/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350D834	List: 05000259/LER-1981-016, Forwards LER 81-016/01T-0 05000259/LER-1981-016-01, /01T-0:on 810501,fire Pump Automatic Start Logic Found Inoperable During post-mod Tests.Caused by Wiring Being Removed from Terminal Points in Main Relay Panel 52. Permanent Wiring Replaced
References
LER-81-016-01T, LER-81-16-1T, NUDOCS 8105190408
Download: ML19350D838 (2)

LER-1981-016, /01T-0:on 810501,fire Pump Automatic Start Logic Found Inoperable During post-mod Tests.Caused by Wiring Being Removed from Terminal Points in Main Relay Panel 52. Permanent Wiring Replaced

Event date:
Report date:
2591981016R01 - NRC Website

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H 60 68 OOCKET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o 121 l During post-modification tests on a new sprinkler system, the fire pump automatic start logic was found inoperable.

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fire pump was running at the time the inoperability was discovered. The pump was g

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kept running while the automatic-start circuit was repaired. Manual start capability,

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Tennessee Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2 e-3/24/81 LER SUPPLEMENTAL INFORMATION BFRO 259_/ 81016 Technical Specification Involved 3.ll.A.1.b Reported Under Technical Specification 6.7.2.a(2)

Date of Occurrence 5/1/81 Time of Occurrence 1550 _ Unit

1. 2. and 3 Identification and Description of Occurrence:

Power (120V AC preferred) lif ted 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 or less.

Conditions Prior to Occurrence:

Unit I refueling outage Unit 2 at 99%

Unit 3 at 100%

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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 modification in the 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 no resulting significant chain of events.

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Corrective Action

Replaced permanent wiring imn:ediately. Precautions have been added to the work plan requiring the electricians to consult with the cognizant engineer prior to removing any existing wiring.

Failure Data:

None

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