ML20034A310
| ML20034A310 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/13/1990 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 90-05, 90-5, NUDOCS 9004230025 | |
| Download: ML20034A310 (3) | |
Text
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l TENNESSEE' VALLEY' AUTHORITY -
CH ATTANOOGA. TENNESSEE 37401 SN 157B L'ookout Place APR 131990-U.S. Nuclear Regulatory Commission ATTN: Document Control ~ Desk Hashington, D.C.
20555 Gentlemen:-
TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT UNIT 1 - DOCKET NO.
50-327 - FACILITY OPERATING LICENSE DPR SPECIAL REPORT 90-05 This special report provides details concerning the Unit 1_-auxiliary instrument room carbon dioxide (CO,) fire suppression system being inoperable for greater than 14 days.
The system was removed from> service to facilitate-outage activities and to prevent. accidental: actuation of the CO, into the auxiliary instrument room.
This report is being made in accordance with Technical Specification Action Statement 3.7.ll.3.aa-The' enclosure contains.the details concerning the condition.
If you'have any questions concerning this sabmittal.,please telephone-M. A. Cooper at (615)-'843-6651.
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Very truly yours, TENNESSEE VALLEY AUTHORITY fi E. G; Wilace, Maaa ier Nuclear Licensing d-Regulatory.. Affairs Enclosure cc: See page 2 9004230025 900413 PDR ADOCK 05000327 9
PNV
' An Equal Opportunity Employer 4
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- U.S. Nuclear Regulatory Commission
' APR 131990 cc'(Enclosure >i Ms.-S. C. Black, Assistant Director for Projects.
TVA Projects Divislon-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. H11 son, Assistant Director i
for-Inspection Programs TVA Projects Division l
U.S. Nuclear Regulatory Commission-l Region II l
101 Marietta Street, NN, Suite 2900 Atlanta,: Georgla 30323 i
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ENCLOSURE, SON Unit 1 Special Report 90-05 Description of Event On March 20, 1990, with Unit 2-operating in Mode 1-(100 percent power, 2,235 pounds per square inch gauge and 578 degrees Fahrenheit) and Unit 1-shut down in Mode 5 for a planned refueling outage, the Unit 1 auxiliary. instrument room carbon dioxide (CO,) fire suppression system was removed from service to facilitate outage activities and to prevent-any accidental discharge of.
CO, in the instrument room..The CO, system will be inoperable for the.
duration of the refueling outage.
This report is being made-in accordance with SQN Technical. Specification Action Statement 3.7.11'.3.a.
Cause of the Condition Modification activities in the Unit 1 auxiliary-building' instrument room.
require an increased number of. personnel to be present at the same time in order to accomplish the assigned tasks, e.g., cable pulling. Additionally,.
personnel will be required to perform some tasks.in cramped; positions between the cable trays and on top of scaffolding'.
In the event.of:an activation'of.
the CO, fire suppression system, the evacuation of personnel from the room in 20 seconds would be difficult..Therefore, for the safety of personn'el working in the-instrument room,'the CO, fire suppression: system has been removed from service for the duration of the Uni _t l' Cycle 4 refueling outage.
Corrective Action l
i Limiting Condition for Operation 3.7.11.3-was entered at 1400 E' astern standard I
time on March 20, 1990. A continuous fire' watch was immediately established
- l with backup fire suppression equipment available for fire protection while the CO, system is inoperable.
The fire watch.will remain in effect until the outage-related activities in the room have been completed and.the C0i system is returned to service, i
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