ML20133N516
| ML20133N516 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 07/17/1985 |
| From: | Nix H GEORGIA POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| LR-MGR-069-0785, LR-MGR-69-785, NUDOCS 8508130510 | |
| Download: ML20133N516 (2) | |
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Georgia Power Comp:ny Post Offica B:x 439 B:xt:y, Georgia 31513 Telephone 912 367-7781 912 537-9444 Georgia Pbwer Edwin 1. Hatch Nuclear Plant July 17, 1985 LR-MGR-069-0785 PLANT E.
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HATCH Special Report Docket No. 50-321 United States Nuclear Regulatory Commission i
Office of Inspection and Enforcement Region II Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30323 co M
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C-ATTENTION:
Dr.
J. Nelson Grace e
o ITT Attached is Special Report No.
50-321/1985-002.
Tirls gportC) is required by Hatch Unit 1 Technical Specification's Section 3. 1,31 2.
r ACTION b.1 and Hatch Unit 2 Technical Specifications SectionD 3.7.'6. l.
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Nix General Manager
>$$A HCN/SBT/dja xc: R. J. Kelly R. E. Conway J. T. Beckham, J r.
P. D. Rice
'K. M. Gillespie D. R. Altman Superintendent of Regulatory Compliance R. D. Baker Control Room Document Control f
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4 SPECIAL REPORT 50-321/1985-002 LICENSEE GEORGIA POWER COMPANY FACILITY NAME:
EDWIN I. HATCH DOCKET NUMBER:
50-321/1985-002 i
On July 6, 1985, at approximately 0500 CDT, Unit 1 was in steady-state operation at approximately 1390 MWt (approximately 57% power) and Unit 2
was in steady-state operation at approximately 2432 MWt i
(approximately 100% power).
At this time, the air supply to the fire suppression water system deluge valves for the "lC" cooling tower was being maintained by a nitrogen bottle due to the air compressor for i
the "lC" cooling tower being out-of-service for maintenance.
The nitrogen pressure decreased low enough to activate the deluge valves.
The activated deluge valves caused a low fire water pressure on the fire suppression water system which automatically started the electric fire pump and one diesel fire pump.
Before plant personnel could isolate the deluge valves, the volume of both fire suppression water 1'
storage tanks was reduced to less than the minimum of 270,000 gallons requirement of Unit 1 Tech. Specs. section 3.13.2.b and Unit 2 Tech.
Specs. section 3.7.6.1.b.
Plant personnel returned the volume of both tanks to within the Tech. Specs. limit in approximately 45 minutes.
After performing an investigation, plant personnel determined that the nitrogen pressure had decreased due to defective / stripped pipe thread connection in the manifold isolation valve for the air compressor for the-
"lC" cooling tower (i.e.,
where the air line connects to the manifold isolation valve).
Plant personnel isolated the defective / stripped pipe thread connection immediately and placed a
new nitrogen bottle in service.
Plant personnel then placed the activated and isolated deluge valves back into service on July 6, 1985.
Plant personnel replaced the manifold isolation valve for the air l
compressor, repaired the air compressor, and returned the air compressor to service on July 16, 1985.
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