ML19327B138

Special Rept 89-12:on 890907,smoke Detectors in Fire Detection Zone 352,lower Compartment Coolers Inoperable Per Trouble Light on Panel O-L-629.Cause Will Not Be Determined Until Entry Into Fire Zone.Air Temp Monitored Hourly

ML19327B138
Person / Time
Site:	Sequoyah
Issue date:	10/23/1989
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
89-12, NUDOCS 8910250274
Download: ML19327B138 (2)

Text

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. 4 g , ,y TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 SN 1578 Lookout Place 00T 231989 U.S. Nuclear kegulatory Commission ATTN

. Document Control Desk Hashington 0.C. 20555 Gentlemen: ,

In the Matter of ) Docket No. 50-327 Tennessee Valley Autt'ority )

SEQUOYAH NUCLEAR PLANT (SQN) UNIT 1 - DOCKET NO. 50-327 - FACILITY OPERATING LICENSE DPR SPECIAL REPORT 89-12 This enclosed special report provides details concerning smoke detectors in Unit 1 fire detectior. Zone 352, lower compartment coolers, which have been inoperable for more than 14 days. This report is being made in accordance with Limiting Condition for Operation 3.3.3.8, Action Statement b.

If you have any questions concerning this submittal, please telephone M. A. Cooper at (615) 843-6651.

Very truly yours, TENNESSEE VALLEY AUTHORITY I

Manager, Nuclear Licensing and

, Regulatory Affairs Enclosure cc (Enclosure):

Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852

~.Mr. B. A. Wilson, Assistant Director for Inspection Programs TVA Projects Division U.S.. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Sequoyah Nuclear Plant g 2600 Igou ferry Road p Soddy Daisy, Tennessee 37379  ;

8910250274 89.1023 gDR ADOCK 0500 7 An Equal Opportunity Employer

1 m% e.

. ENCLOSURE

," SQN SPECIAL REPORT 89-12 w

Description of Event

<- On September 7,1989, with Units 1 and 2 in Mode 1, at 100 percent power,.

l 2,235 pounds per square inch gauge, 578 degrees Fahrenheit, while performing F Surveillance Instruction (SI) 234.7, " Technical Specificat. ion Fire Detectors,"

it was determined that smoke detectors with the equipment identification Nos.

L XS-013-190A, XS-013-1908, XS-013-190C, and XS-013-1900 located in Unit 1 fire j detection Zone 352, lower compartment coolers, were inoperable as indicated by the trouble light on Panel 0-L-629. Limiting Condition-for Operation L (LCO) 3.3.3.8 was entered at 2235 Eastern daylight time (EDT) on l- September. 7, 1989.

l Fire detection Zone 352, lower compartment coolers, is located inside containment within the polar crane wall. On September 7, 1989, for ALARA (as s low as reasonably achievable) reasons, a management decision was made not to

i. enter fire detection Zone 352 to restore the smoke detectors to an operable status. This decision has prevented the inoperable smoke detectors from being

( restored to an operable status within 14 days as required by LCO 3.3.3.8, Action Statement b. At 2335 EDT on September 7, 1989, as required by i LCO 3.3.3.8, Action Statement a, hourly containment air temperature monitoring l

began at the locations listed in Specification 4.6.1.5.

Cause of Event The root cause of this event will not be determined until entry into fire detection Zone 352 is made and work request (HR) 8771329 is performed.

HR B771329 is scheduled to be worked during the next Unit 1 outage of sufficient duration, currently scheduled for December 1989.

Analysis of Event This event is reported in accordance with the requirements of Action Statement b of LCO 3.3.3.8.

The mitigating effect of the inoperable smoke detectors on the fire suppression system is compensated by the existing hourly containment air

[ temperature monitoring being performed.

Corrective Action Containment air temperature is being monitored at least once every hour at the

,' t locations listed in Specification 4.6.1.5 as required by LCO 3.3.3.8, Action Statement a. HR B771329, scheduled to be worked in December 1989, has been written to determine and correct the root cause of the event.

Commitments

! None.

E L

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