ML20108F500
| ML20108F500 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 02/05/1985 |
| From: | Nix H GEORGIA POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 50-321-1985-001, 50-321-1985-1, GM-84-101, NUDOCS 8503120455 | |
| Download: ML20108F500 (3) | |
Text
T Georgia Power Company g*
Poet Office Box 439 -
samley, Georgia 31513 Telephone 912 367 7781 912 537-9444 n 1 *. N Gnroh Phmar e{rNnh Edwin 1. Hatch N February 5, 1985 GM-84-101 PLANT E.
I. HATCH Licensee Event Report Docket No. 50-321 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region II Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30323 ATTENTION:
Dr. J. Nelson Grace Attached is Special Report No.
50-321/1985-001.
This report is required by Hatch Unit 1 Technical Specifications Section 3.13.2,
~ ACTION b.1 and Hatch Unit 2 Technical Specifications Section 3.7.6.1 ACTION b.2.c).
N H. C. Nix /
General Manager fd HCN/TLE/viz xc: R. J. Kelly R. E. Conway J. T. Beckham, Jr.
P. D. Rice K. M. Gillespie Superintendent of Regulatory Compliance R. D. Baker Control Room Document Control 1
DFFICIAl. COPY s
p ff >2 I(t
=-
a.
4 4
Special Report 50-321/1985-001 i
LICENSEE GEORGIA POWER COMPANY FACILITY NAME EDWIN I. HATCH DOCKET NUMBER 50-321 First Event:
On January 22, 1985, at approximately 1000 CST, Unit 1 was in steady ctate operation at approximately 1419 MWt (approximately 58% power) and Unit 2 was in run, ramping to full power, at approximately 1900 MWt (approximately 78% power).
At this time, the power to the ' air' compressor in the south deluge house for the "lB" cooling tower was lost (due to trip of cooling tower "lB" transformer) resulting in the activation of both "lB" cooling tower deluge systems.
This caused a low fire water pressure on the fire water system which, in turn, automatically started the electric fire pump and one diesel fire Pump.
Before the activated deluge valves could be
- isolated, the volume in both fire water storage tanks dropped below the 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 (i.e.,
approximately 230,000 gallons).
The valves were
- isolated, and the volume of both' fire Protection water storage tanks was returned to greater than 270,000 gallons in approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 50 minutes.
The transformer was returned to service, thus restoring power to the air compressor in the south deluge house, and the deluge system for "1B" cooling tower was returned to operable status on 1/22/85.
A continuing investigation is underway to determine why the transformer tripped.
Second Event:
On January 24, 1985, at approximately 2340 CST, with Unit 1 in steady otate operation at approximately 1863 MWt (approximately 76% power) and Unit 2
in steady-state operation at approximately 1741 MWt (approximately 71% power), belt for the air compressor in the south deluge house for the "lB" cooling tower broke.
This resulted in the activation of both "lB" cooling tower deluge systems.
This caused a low fire water pressure on the fire water system which, in -turn, cutomatically started the electric fire pump and both diesel fire pumps.
Before the activated deluge valves could be
- isolated, the volume in_ both fice water storage tanks dropped below ' the 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 (i.e.,
approximately 220,000 gallons).
The valves were
- isolated, and tr a volume of both fire protection water storage tanks was returned to greater than 270,000 gallons in approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 20 wirvtes.
Special Report 50-321/1985-001 Page 2 of 2 The broken belt was replaced on the air compressor in the south deluge house and the deluge valves' for "lB" cooling tower were returned to service on 1/25/85.
Third Event:
On January 31, 1985, at approximately 2130 CST, with Unit 1 in RUN at approximately 120 MWt (approximately 5% power) and Unit 2 in steady otate operation at approximately 2430 MWt (approximately 100% power),
the cooling tower fire main broke between the "lB" and "lC" cooling towers.
This caused a low fire water pressure on the fire water cystem which, in turn, automatically started the electric fire pump and both diesel fire pumps.
Before the broken fire main could be isolated, the volume in both fire water storage tanks dropped below the 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 (i.e.,
opproximately 246,000 gallons).
The broken section of fire main was isolated, and the volume of both fire protection water storage tanks was returned to greater than 270,000 gallons in approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 30 minutes.
t i
1 1
r
..,