ML20127B626

Special Rept 92-11:on 921202,two Penetration Fire Barriers Breached for More than 7 Days.Caused by Discovery of Defective Fire Retardant Sealant.Roving Fire Watch Established & New Fire Retardant Sealant Installed

ML20127B626
Person / Time
Site:	Sequoyah
Issue date:	01/07/1993
From:	Fenech R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
92-11, NUDOCS 9301130017
Download: ML20127B626 (3)

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tenressee vaaev Avtnonty. Tw.t o%e Box 2rxo Gynfu sy. tennewe 37atatxo Robert A, Fenech

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January 7, 1993 U.S. Nuclear Regulatory Cormnission.

AT1141. Document Control Desk Washington, D.C. 20555 Gentiemen -

In the Matter of ) Docket Nos. 50-327 Tenaessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PIANT (SQN) - UNITS 1 AND 2 - FACILITY OPERATING LICENSES DPR-77 AND DPR TECilNICAL SPECIFICATION 3.7.12 SPECIAL REPORT 92-11' The enclosed special report provides details concerning two fire barriers

-.being breached for a period greater than the technical specification.(TS) allowable' time. The condition was the result-oft a preplanned activity,-and compensatory measures were taken in accordance with'TS requirements. This report is being submitted in accordance with TS 3.7.12 Action Statement (a).

If you have any questions concerning this submittal, please telephone C.11. Whittemore at (615) 843-7210.

Sincerely, h -e--*k Robert A. Fenech Enclosure cc: See page 2 120051

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

NRC Resident Inspector' ,

Sequoyah Nuclear Plant 2600 Igou_ Ferry. Road _

Soddy-Daisy, Tennessee-_37379-3624 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission I Region II 101 Marietta Street, NW, Suite 2900 '

Atlanta, Georgia 30323-0199 3 L

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ENCLOSURE SEQUOYAll NUCLEAR p1 ANT SPECIAL REPORT 92-11 Descriptio1LoLCondillon on December 2, 1992, with Units 1-and 2 operating in Mode 1, two penetration fire barriers were breached, Limiting Condition for Operation (LCO) 3.7.12 was entered, and appropriate compensatory measures were initiated. The breached condition existed for a period of time that was greater than the technical specification (TS) allowable period of seven days. The fire barriers were breached in the process of remov!ng defective cables and routing new cables. The penetrations are for cable trays going from the turbine building into the control building on Elevation 706.0 and from the control building into the auxiliary building auxiliary relay room on the Unit 1 side.

Cauan_.nLCondition The fire barriers were not reestablished within the 7-day TS allowable timeframe because the fire retardant sealant that is used to establish a-fire barrier was determined to be def ective. - Quality Control inspectors -

tested and rejected the sealant before it could be used. New sealant could not be obtained before the 7-day timeframe expired.

CorrsstiYm Asilon i In accordance with LCO 3.7.12 Action Statement (a), the ' operability of ,

' fire detectors on one side of each penetration was verified, and a-roving-fire watch was established.- New fire retardant sealant was obtained and installed. The fire barriers were returned to functional-status on December 22, 1992.

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