ML20217C188
| ML20217C188 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 07/09/1991 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 91-07, 91-7, NUDOCS 9107120079 | |
| Download: ML20217C188 (4) | |
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e nn 1enrwee veer Auro.t iict m+et stteei chauawg. Temmee per JUL 091991 U.S. Nuclear Regulatory Commlnsion ATTN Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
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Docket Nos. 50-3?7 Tenneccee Valley Authority
)50-32b SEQUOYAll NUCLEAR PLANT (SQN) - TECl{NICAL SPECIFICATIONS 3.3.3.8 AND 3.7.11.2 - SPECIAL REPORT 91-07 The enclosed special report provides details concerning the inoperability of the fire detection instruments in Fire Zones 364 and 369 for the Unit 1 Nos. 3 and 4 reactor coolant pumps, respectively. The two thermal fire detector zones will be out of service until the next outage of sufficient duration. This report is being submitted in accordance with Technical Specification Action Statement (b) of Limiting Conditions for Operation 3.3.3.8 and 3.7.11.2.
If you have any questions concerning this submittal. pinase telephone R. R.-Thompson at (615) 843-1470.
Very truly yours, TENNESSEE VALLEY AUTliORITY
- 0. Wallace, Manager Nu:1 car Licensing and Regulatory Affairs Enclosure cct See page 2 l
9107120079 910709 PDR ADOCK 05000327 S
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U.S. Nuclear Regulatory Conalsnion JUL 091991 cc (Rnclosure):
Ms. S. C. Black, Deputy Director Project Directorato 11-4 U.S. Nuclear Regulatory Commission Ono White Flint, North 11S55 Rockville Piko Hockvillo, Maryland 20852 hr. D. E. LaBargo, Project Manager t'.S. Nucicar Regulatory Connicolon One *.'hite Filnt, North 11$55 Rockvillo Pike Rockville, Maryland 20852 NRC Hosident inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daley, Tennesseo 37379 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regut.atory Commisalon Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 I
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ENCLOSURE 1 SEQUOYAll NUCLEAR PLANT j
SpKCIAL REPORT 91-01 i
This special re ort is being made in accordance with Action Statement b of Limitint, Conditions for Operation (LCoo) 3.3.3.8 and 3.1.11.2 because of the inability to repair inoperabin fire detectors within 14 days.
On May 26, 1991, at 0005 Eastern daylight timo (EDT) and on May 28, 1991, at 1137 EDT with Unit 1 in Modo 1 (100 percent power, 2,235 pounds por square inch gauge, ant. 578 degrees Fahronheit), LCOs 3.3.3.8 and 3.7.11.2 woro entered when the Unit, 1 Nos. 4 and 3, respectively, reactor coolant pump fire detectors were removed from cervice. Troubiechooting tho detector circul's at their time of failurn verified the faults to bo located insidu Unit lot'-
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containment polar crane wall.
L An hourly monit ring of the containment. air temperature was entablished in compliance with.ction Statement 3.3.3.8.a.
Fire suppression capability was still available through manual initiation by operators.
The inaccessibility of t.he detectors because of excessive radiation lovels during pcwor opeNtions has prevented a repair or replacement attempt.
Detectors in the affweled zones will be restored to operable status during, the no:tt Unit 1 outage of sufficient dur lon.
A deterwinst ton of the exact cause of the detectors' inoperability cannot bo determined until that time.
Sequoyah will remain in LCOs 3.3.3.8 and 3.7.11.2, and the hourly lower containment temperaturo monitoring will be continued until the firo detectors are returned to operable status.
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e ENCLOSURE 2 Comitment The fire detectors in the af fected rottent will be rostored to operable statua during the next Unit 1 outage of sufficient duration.
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