ML20042E858
| ML20042E858 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/01/1990 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 90-07, 90-7, NUDOCS 9005030246 | |
| Download: ML20042E858 (3) | |
Text
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e TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNES$EE 37401 SN 157B Lookout Place MAY 011990 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Hatter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - TECHNICAL SPEClf! CATION (15) 3.3.3.8 - SPECIAL REPORT 90-07 The enclosed special report provides detalls concerning the inoperability of the fire detection instrumentation for fire Zones 134, 135, 142, 143, 144, and 145 on Elevation 714 of the auxiliary building. These detectors are located in the vicinity of the component cooling heat exchangers, and will be out of service for greater than 14 days as a result of ongoing outage work.
This report is being submitted in accordance with TS Action Statement (b) of Limiting Condition for Operation 3.3.3.8.
If you have any questions concerning this submittal, please telephone M. A. Cooper at (615) 843-6651.
Very truly yours, TENNESSEE VALLEY AUlHORITY
, k,.
O.G.Hallace, Manager Nuclear Licensing and Regulatory Affairs Enclosure cc:
See page 2 f00$bfhbbh7
$k An Equal Opportunity Employer I
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<. c U.S. Nuclear Regulatory Commission NY 0120 cc (Enclosure):
Ms. S. C. Black, Assistant Director forProjects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 NRC Resident inspector Sequoyah Nuclear Plant 2600 Igou ferry Road Soddy Daisy, Tennessee 37379 Mr. B. A. Wilson, Assistant Director for Inspection Programs IVA Projects Division U.S. Nuclear Regulatory Commission Region !!
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 4
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..._________-J
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ENCLOSURE
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SQN SPECIAL REPORT 90-07 Description of Condition TVA:ls currently performing modifications associated with the replacement of Component Cooling System Heat Exchanger C.
The extensive welding and grinding necessary.for the heat exchanger changeout could cause numerous and unnecessary actuations of the fire detection and suppression system.- To facilitate outage activities and prevent unintentional initiation of the fire detection and suppression system in the vicinity of the Component Cooling Heat Exchanger C, 30 fire detectors were removed from service.. On April 11, 1990, at 2115 Eastern daylight time with Unit 1 in Mode 6, shut down for' refueling, and Unit 2 in Mode 1 (24 percent power, 556 degrees fahrenheit, and 2,235 pounds per square Inch gauge) Limiting Condition for Operation -
(LCO) 3.3.3.8 was entered on both units.
The fire detectors are located in Fire Zones 134, 135, 142, 143, 144, and 145 on Elevation 714 of the auxiliary.
building.
Gsuse_of_theCondition 1he extensive welding and grinding necessary for the heat exchanger changeout could cause numerous and unnecessary actuations of the fire detection and suppression system.
Therefore, the fire detectors in.the vicinity of the heat exchanger have been removed from service.
Corrective Action 1
The fire suppression-system was vertfled operable'and, in accordance with.
l Action a of LCO 3.3.3.8, a fire watch was established for the affected zones.
i lhe action statement requires an hourly fire watch; however, a continuous fire watch was established'because of the continuous welding and grinding activities in the area. The continuous fire watch will remain in effect until the fire detectors are returned to service at the conclu'slon of the outage,
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