ML20082P506
| ML20082P506 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/06/1991 |
| From: | Joshua Wilson TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9109100353 | |
| Download: ML20082P506 (4) | |
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.e September 6, 1991 l
1 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) - DOCKET NOS. 50-327 AND 50-328 -
FACILITY OPERATING LICENSES DPR-77 AND 79 - TECHNICAL SPECIFICATION (TS) 3.3.3.3 - SPECIAL REPORT 91-13 The enclosed special report provides details concerning the inoperability ci the fire detection instrumentation in Fire Zone 352 for the lower compartment cooler area.
The zone will be out of service until the next outage of sufficient duration. This report is being submitted in accordance with TS Action Statement (b) of Limiting Condition for Opetation 3.3.3.8.
The commitment made in this report is listed in.
If you have any questions concerning this submittal, please telephone M. A. Cooper at (615) 843-8924 Very truly yours, TENNESSEE VALLEY AUTHORITY
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J L. Wilson Enclosure cc:
See page 2 9109100353 910906
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~U.S. Nuclear Regulatory Commission September 6, 1991 l
ce_(Enclosure):
Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulacory Commission One White Flint, North 11555:Rockville Pike
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h Rockville. Maryland 20852 I
NRC. Resident Inspector Sequoyah Nuclear Plant 5
2600 Igou1 Ferry Road-Soddy-baisy, Tennessee 37379-Mr.
B._-A. Wilson, Project Chief RU.S. Nuclear Regulatory Commission 4
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Region II i
101 Marietta Street, NW, Suite 2900' 1
Atlanta, Georgia 30323-i 4
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i ENCLOSURE 1!
SEQUOYAH NUCLEAR PLANT (SQN)
SPECIAL REPORT 91-13 i
This special report is being made in accordance-with Action Statement b of.
Limiting condition for-oper'acion (LCO) 3.3.3.8 because of the inability to repair inoperable ' fire detector (s) within 14 days.
On-July 27. 1991, at 1715 Eastern. daylight time with Unit 1 operating in
. Mode 1 (100' percent power, 2235-pounds per square' inch gauge, and 578 degrees i
Fahrenheit) LCO 3.3.3.8 was entered when a trouble alarm on Fire Protection l'
Panel 0-L-629 was observed. An investigation into.the situation revealed that a fire detector in Fire Zone 352 had apparently malfunctioned.
Fire _ Zone 352 is for the lower compartment coolers located inside the Unit 1 containment.
The zone contains four detectors; a failure of any or all of these detectors results in receipt offthe trouble alarm.
Technical Specification 3.3.3.8-requires that all four detectors be operable.
An hourly monitoring of the containment air temperature was established-in
. compliance with Action Statement 3.3.3.8.a.
Fire _ suppression capability is still available through manual initiation by operators.
Because of ALARA (as low as reasonably' achievable) considerations during power operations, the inaccessibility of the detectors has prevented a repair or_ rep;acement attempt.
The detectors in'the affected zone will be_ restored to operable status _during the next: Unit l' outage of sufficient duration. A determination of the exact cause of then. detector's inoperability cannot be determined until that-time.
- SQN will remain'in LCoi3.3.3.8 and the hourly lower containment temperature monitoring will be continued until the fire zone detectors are returned to operable status.
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ENCLOSURE 2
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Conni tment l
l The detectors in the affected zone will be restored to operable status during l
the next l! nit 1 outage of sufficient Juratlon.
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