ML20071L735

Special Rept 94-07:on 940621,fire Detection Instrument in Zone 116 for Auxiliary Bldg Cask Loading Area Inoperable for Period Greater than Allowable TS Timeframe. Hourly Fire Watch Patrol Established

ML20071L735
Person / Time
Site:	Sequoyah
Issue date:	07/27/1994
From:	Powers K TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
94-07, 94-7, NUDOCS 9408030241
Download: ML20071L735 (4)

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A Tmnse VanefAway Pmt Oke EK3x MM Suicty D#u .y, Tornwee 37379 NXYJ Kon Powers vr.e PmvMt. Emmah Nxhor MW July 27, 1994 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAll NUCLEAR PLANT (SQN) - UNITS 1 AND 2 - FACILITY OPERATING LICENSES )

DPR-77 AND DPR TECHNICAL SPECIFICATIONS (TSs) 3.3.3.8, 3.7.11.2, AND l 3.7.12 - SPECIAL REPORT 94-07 l The enclosed special report provides details concerning the fire detection instruments in Fire Zone 116 for the auxiliary building cask loading area being inoperable for a period of time greater than the allowable TS timeframe. Also provided in this specic1 report are details concerning the removal of the biological shield blocks and opening of the Unit 2 equipment hatch. This report is being submitted in accordance with TS Action Statements 3.3.3.8. (b ), 3. 7.11.2(a), and '. 7.12(a).

If you have a y questions concerning this submittal, please telephone C. II. Whittemore at (613) 843-7210.

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Sincerely, kYo "Y l

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R. H. Shell Enclosure ec: See page 2 0000JJ ,

1 940GO30241 940727 /'2S PDR ADDCK 05000327 ,,

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U.S. Nuclear Regulatory Commission Page 2 July 27, 1994 cc (Enclosure):

Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commis sion One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 i Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711

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ENCLOSURE SEQUOYAH NUCLEAR 'LANT UNITS 1 AND 2 SPECIAL REPORT 94-07

1. FIRE DETECTORS IN CASK LOADING AREA IN AUXILIARY BUILDING Deact.ipib n of Conslilinn On June 21, 1994, with Unit 1 in Mode 1 at 100 percent power and Unit 2 in Mode 1 at 84 percent power beginning coast-down to a  ;

refueling outage, the ionization fire detection instrumentation in the auxiliary building cask loading area (Fire Zone 116) was declared inoperable, and limiting Condition for Operation (LCO) 3.3.3.8 was entered. LCO 3.7.11.2 was also entered because the '

automatic actuation ability of the sprinkler system in this area was disabled, i.e., fire detectors declared inoperable.

Cause_of_Condit.ipn The fire detectoro in the auxiliary building cask loading area were disabled to prevent the exhaust of diesel trucks from initiating '

invalid fire alarm signals. This area is used to unload fuel casks and equipment needed to support the Unit 2 refueling outage. The ,

fire detectors will be disabled for the duration of the Unit 2 refueling outage and will exceed the technical specification (TS) allowable timeframe as specified in LC0 3.3.3.8 Action Statement (b).

Corres_tireLAction In accordance with LC0 3.3.3.8 Action Statement (a) and LCO 3.7.11.2 Action Statement (a), an hourly fire patrol was established to inspect the auxiliary building cask loading area. The patrol will be maintained until the outage activities in the area are completed, the detectors are returned to operable status, and LCOs 3.3.3.8 and 3.7.11.2 have been exited.

II. REACTOR BUILDING UNIT 2 BIOLOGICAL SHIELD BLOCKS Description of Can.dilh n 4

on July 5, 1994, with Unit 1 in Mode 1 at 100 percent power and l Unit 2 in Mode 3 entering a refueling outage, the biological shield j blocks were removed and the Unit 2 equipment hatch was opened. The j hatch will be open for the duration of the refueling outage and in excess of the 7-day TS allowable timeframe. This condition is being reported in accordance with TS Action Statement 3.7.12(a).

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. i Cauan_of_ Condition i The shield blocks were removed to facilitate the movement of equipment, material, and personnel into Unit 2 containment. The shield blocks will remain open for the duratien of the Unit 2 Cycle 6 refueling outage.

CarInctive Actio.n In accordance with LCO 3.7.12 Action Statement (a), the fire 4 detectors on one side of the hatch were verified operable; a rovin6 ,

fire patrol was immediately established and will be maintained until the hatch is closed and the blocks are reinstalled, reestablishing i the fire barrier before entering Mode 4.

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