ML20096C528

Special Rept 95-10:on 951127,alarm Function for Fire Detection Zone 277 Bypassed,Rendering Fire Detectors Inoperable.Fire Watch Patrol Was Established within One Hour of Fire Zone Becoming Inoperable

ML20096C528
Person / Time
Site:	Sequoyah
Issue date:	01/09/1996
From:	Shell R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
95-10, NUDOCS 9601180005
Download: ML20096C528 (3)

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W 4 .g Tennessee Valley Authority. Post Office Box 2000, Soddy-Daisy. Tennessee 37379-2000 January 9,1996 j l l U.S. Nuclear Regulatory Commission l ATTN: Document Control Desk j Washington, D.C. 20555 '

1 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328  :

l SEQUOYAH NUCLEAR PLANT (SQN)- UNITS 1 AND 2 - FACILITY OPERATING l LICENSES DPR-77 AND DPR TECHNICAL SPECIFICATION (TS) 3.3.3.8 - )

SPECIAL REPORT 95-10 l l

The enclosed special report provides details concerning Fire Detector Zone 277 for the l essential raw cooling water pumping station, which was removed from service to facilitate i maintenance activities. The fire detectors associated with this zone were inoperable for a time period greater than the TS allowable timeframe.

This report is being submitted in accordance with TS 3.3.3.8 Action Statement (b).

. If you have any questions concerning this submittal, please telephone J. Bajraszewski at l (423) 843-7749.

Sincerely, 1 k, Y R. H. Shell l Manager SQN Site Licensing l

l Enclosure cc: See page 2 i

9601100005 960109 PDR ADOCK 05000327 S PDR 180005

. I U.S. Nuclear Regulatory Commission Page 2 January 9,1996 J

KEM:JB:JLG  ;

cc (Enclosure):'

Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, Nonh 11555 Rockville Pike Rockville, Maryland 20852-2739 .-

NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission Region II r

101 Marietta Street, NW, Suite 2900 ,

Atlanta, Georgia 30323-2711 l

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6 ENCLOSURE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 SPECIAL REPORT 95-10 i

Descriotion of Condition l

On November 27,1995, the alarm function for Fire Detection Zone 277 was bypassed, ') '

rendering the fire detectors associated with that zone inoperable. Fire detectors for Zone 277 are located in the essential raw cooling water (ERCW) pumping station.

These detectors were inoperable in excess of the technical specification (TS) allowable timeframe of 14 days. This condition is being reported in accordance with TS 3.3.3.8  ;

Action Statement (b).

Cause of Condition -  ;

In support of maintenance activities associated with the overhaul of an ERCW pump, the fire detection zone was bypassed to prevent spurious actuation of the fire detection system in the ERCW pumping station. As part of the maintenance work, one pump assembly was disassembled, end the pump was shipped to Johnson Pump Company for inspection and ,

repair. Upon return of the pump onsite, it was determined that the vendor did not provide weld repair documentation. This delayed pump reassembly. As a result of the problems .

encountered with the pump's documentation, the fire zone could not be restored within the j TS allowable timeframe. j i

Corrective Action In accordance with TS 3.3.38 Action Statement (a), a fire watch patrol was established within one hour of the fire zone becoming inoperable. The fire watch patrol was maintained until the fire zone was returned to service on December 15,1995.

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