ML20149M919

Special Rept 88-02:on 880129,fire Barrier Nonfunctional for Greater than 7 Days.Caused by Duration of Procedure for Draining,Refilling,Flushing & Adding Chemicals to Hx.Roving Fire Watch Established

ML20149M919
Person / Time
Site:	Sequoyah, 05003278
Issue date:	02/25/1988
From:	Shawn Smith TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-02, 88-2, NUDOCS 8802290259
Download: ML20149M919 (2)

Text

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• 1. TENNESCEE VALLEY AUTHORITY

, Sequoyah Nuclear Plant Post Office Box 2000 Soddy-Daisy, Tennessee 37379 February 25, 1988 U.- S. Nuclear Regulatory Comunission Document Control Desk Washington, DC 20555' Gentlemen:

TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 - DOCKET NOS. 50-327 AND -328 - FACILITY OPERATING LICENSE DPE-77 AND DPR SPECIAL REPORT 88-07 The enclosed special report provides details concerning a fire barrier being nonfunctional for greater than seven days. This event is reported in accordance with action statement (a) of Limiting Conditions for Operation 3.7.12.

Very truly yours, TENNESSEE VALLEY AUTHORITY h

f S. J. Smith Plant Manager Enclosure cc (Enclosure):

J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Conunission Suite 2900 101 Marietta Street, NV Atlanta, Georgia 30323 Records Center Institute of Nuclear Power Operations Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 NRC Inspector, Sequoyah Nuclear Plant If(

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, SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 SPECIAL REPORT 88-02 DESCRIPTION OF EVENT On January 29, 1988, with unit 2 in mode 5 (cold shutdown) (0 percent power, 350 psig, 190 degrees F), a fire barrier breaching permit was discovered to have expired. Fire watch personnel found that breaching permit No. 5813 for fire barrier door A-72 had exceeded the seven-day limit allowed by the Sequoyah Nuclear Plant (SQN) Technical Specification (TS) Limiting Condition for Operation (LCO) 3.7.12. Fire barrier door A-72 is to the unit 2 "B" train containment spray and residual heat removal heat exchanger room located on elevation 690 of the Auxiliary Building. The breach of fire barrier door A-72 (January 21, 1988) was required for work being performed to the unit 2 "B" train containment spray heat exchanger. This work required hoses to be routed through the subject door to provide air, drainage, and a domineralized water supply.

CAUSE OF EVENT The duration required to perform this work exceeded the seven-day interval of the breaching permit as performance of System Operating Instruction (SOI)-67.1.D. "Containment Spray System Heat Exchanger Lay-up," was in progress. This procedure requires the drainage, refilling, flushing, and chemical addition to the heat exchanger which requires a large quanity of water to be processed which took an interval of greater than seven days to implement.

ANALYSIS OF EVENT The above described event is being reported in accordance with the requirements of action statement (a) of LCO 3.7.12.

Upon issue of the breach persit a roving fire watch was established to inspect the containment spray heat exchanger room 2B on an hourly basis as required by the action statement of LCO 3.7.12. The existing fire detection system for heat exchanger room had been verified operable and would have functioned in the event of a fire. Therefore, there was no danger to redundant safety-related equipment.

CORRECTIVE ACTION Upon issue of the breach permit, a roving fire watch at a regular interval of one hour was established for the 2B heat exchanger room and maintained until the completion of work. The performance of SOI-67.1 to layup the heat exchanger and the closure of the fire barrier breach (Permit No. 5813) was completed on February 1, 1988. No further action is required.

08/3Q

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