ML20106J856
| ML20106J856 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/08/1996 |
| From: | Shell R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 96-02, 96-2, NUDOCS 9604120030 | |
| Download: ML20106J856 (3) | |
Text
'
e e
RA Tennessee Valley Authonty Post Omco Bon 2000. Sockly Daisy. Tennessee 37379 April 8, 1996 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:
In the Matter of
)
Docket No. 50-327 Tennessee Valley Authority
)
SEQUOYAH NUCLEAR PLANT (SQN) - UNIT 1 - FACILITY OPERATING LICENSE DPR TECHNICAL SPECIFICATION (TS) 3.3.3.8 - SPECIAL REPORT 96-02 The enclosed special report provides details concerning the inoperability of a fire detector in the fan room on Elevation 714 of the auxiliary building. The fire detector failure has been attributed to moistme-mduced oxidation. The fire detector was nonfunctional for a time l
period greater than allowed by TSs.
]
This report is being submitted in accordance with TS 3.3.3.8 Action Statement (a).
If you have any questions concerning this submittal, please telephone J. W. Proffitt at (423) 843-6651.
Sincerely,
[, N.
R. H. Shell Site Licensing Manager Sequoyah Nuclear Plant Enclosure cc: See page 2 9604120030 960408 PDR ADOCK 05000327 S
U.S. Nuclear Regulatory Commission Page 2 April 8,1996 cc (Enclosure):
Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission 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 l
Regional Administrator U.S. Nuclear Regulatory Commission l
Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 l
i
l ENCLOSURE SEQUOYAH NUCLEAR PLANT SPECIAL REPORT 96-02 Descriotion of Condition On March 5,1996, at 1914 Eastern standard time, Fire Zone 136, located in the fan room on Elevation 714 of the auxiliary building, went into an alarm status. The alarm would not clear; therefore, Operations verified that no fire was present. The action for Limiting Conditions for Operation 3.3.3.8 and 3.7.11.2 were entered, and a work request was initiated to correct the problem. Also, a fire watch was established as required by technical specifications (TSs).
Cause of Condition l
The cause of the detector being inoperable has been attributed to moisture-induced l
oxidation on the contacts. The moisture is introduced from the air. The oxidation i
causes a high resistance in the instrument loop, resulting in a trouble alarm being initiated.
Corrective Action l
In accordance with TS.3.3.3.8 Action Statement (a), a fire watch was immediately i
established. The fire watch was maintained until the fire detector was returned to l
operable status. The detectors in Fire Zone 136 were cleaned and returned to service on March 21,1996.
3
)
,