ML20148T894
| ML20148T894 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 01/29/1988 |
| From: | Gucwa L GEORGIA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 88-001, 88-1, SL-3996, NUDOCS 8802030416 | |
| Download: ML20148T894 (6) | |
Text
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- rg'a Fbwer Company 333 Predmont Avenue A:' acta. Georgia 30300 TelepWe 404 526 6526 Ma:f,ng Ad$ess:
Tbst Office dox 4545 At!anta. Georgla 30302 h
Georgia Power L T.Gucws
!!e w1?vn e rt'c sr> tem a
Manager Nuclear Safety ard Licenseng SL-3996 0105I X7GJ17-H540 January 29, 1988 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Hashington, D. C.
20555 PLANT HATCH - UNIT 1 NRC DOCKET 50-321 OPERATING LICENSE DPR-57 SPECIAL REPORT 88-001 FIRE HATER STORAGE TANKS CONTAIN LESS THAN 270,000 GALLONS RESULTING IN SPECIAL REPORT AS REOUIRED BY FIRE HAZARDS REPORT Gentlemen:
In accordance with the requirements of the Plant Hatch Unit 1 Technical Specifications Section 6.9.2, and the Fire Hazards Analysis (FHA) Appendix B,
Georgia Power Company is submitting the enclosed Special Report (SR) concerning an event where the fire water storage tanks contained less that the required water volume.
This event occurred at Plant Hatch - Unit 1.
Sincerely, 06
. T. Gucwa i
LGB/lc
Enclosure:
SR 50-321/1988-001 c:
(see next page) 560' 8802030416 880129 PDR ADOCK 05000321 S
PDR I
r k
Georgia Power h l
U. S. Nuclear Regulatory Commission January 29, 1988 Page Two c:
Georaia Power Comoany Mr. J. P. O'Reilly, Sr. Vice President - Nuclear Operations Mr. J. T. Beckham, Jr., Vice President - Plant Hatch GO-NORMS U. S. Nuclear Regulatory Commission. Hashington. D. C.
Mr. L. P. Crocker, Licensing Project Manager - Hatch U. S. Nuclear Reaulatory Commiss. ion. Region II Dr. J. N. Grace, Regional Administrator Mr. P. Holmes-Ray, Senior Resident Inspector - Hatch 0105I 730776
GeorgiaPower A ENCLOSURE PLANT HATCH - UNIT 1 l
NRC DOCKET 50-321 l
OPERATING LICENSE DPR-57 SPECIAL REPORT 88-001 l
FIRE HATER STORAGE TANKS CONTAIN LESS THAN 270,000 GALLONS RESULTING IN SPECIAL REPORT AS REOUIRED BY FIRE HAZARDS REPORT i
A.
REQUIREMENT FOR REPORT This report is-required per the Unit 1 Technical Specifications section 6.9.2.
This section of the Technical Specifications states that special reports for fire protection equipment operating and surveillance requirements shall be submitted, as required, by the Fire Hazards Analysis (FHA) and its Appendix 8 requirements.
The FHA section 1.3.1 item b requires that the fire suppression water system shall be operable with at least two separate water
- supplies, each with a minimum contained volume of 270,000 gallons.
If this requirement can not be met, a Special Report is required.
I:
B.
UNIT (s) STATUS AT TIME OF EVENTS On 1/11/88 Unit I was in the run mode at an approximate power level of 2433 MHt (approximately 100 percent of rated thermal power).
On 1/11/88, Unit 2 was in the run mode at an approximate power level of 1822 MHt (approximately 75 percent of rated thermal power).
Unit 2 is involved in this event because the fire suppression water system tanks discharge into a common header which provides fire protection water to both Unit 1 and Unit 2.
0105I El-1 01/29/88 SL-3996 r
,. - =
GeorgiaPowerA ENCLOSURE (Continued)
FIRE HATER STORAGE TANKS CONTAIN LESS THAN 270,000 GALLONS RESULTING IN SPECIAL REPORT AS REOUIRED BY FIRE HAZARDS REPORT C.
DESCRIPTION OF EVENT On 1/11/88, at approdmately 1400
The header is located between valves 1Y43-F308F and lY43-F308J, in the Unit 1 Cooling Tower yard.
The rupture of the fire protection water header caused the level in the fire water storage tanks (lY43-A001A and lY43-A0018) to decrease.
On 1/11/88 at approximately 1430 CST, the levels in the two tanks had decreased below the 270,000 gallon limit specified in the FHA.
Plant personnel documented the rupture of the water header and the decrease in water storage tank levels on Deficiency Cards as required by the plant's administrative control procedures, r
When the levels, decreased below the required storage volume, plant operations personnel initiated a Limiting Condition for Operation (LCO) (number 1-88-7).
Plant personnel isolated the 3
break at 1435 CST.
This allowed the levels in the fire water i
storage tanks to be returned to their normal levels.
At 1755 CST, the fire water storage tank levels were above the minimum requirements of the FHA and the LC0 was terminated.
O.
CAUSE OF EVENT The event occurred as a result of a rupture in a fire protection water header.
ihe header ruptured due to consolidation in some of the soil backfill surrounding the header, I
0105I El-2 01/29/88 i
SL-3996
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Tootts
1 k
Georgia Poscr h ENCLOSURE (Continued)
FIRE kATER STORAGE TANKS CONTAIN LESS THAN t/0,000 GALLONS RESULTING IN
,\\
SPECIAL RfPORT AS RE0VIRED BY FIRE HAZARDS REPORT 4
E.
ANALYSIS OF EVENT When the ruptured fire suppression water line was isolated from the rest of the system, this re' UiteC19 the loss of all fire protection to cooling tower 1C and H,e fire protection for the northern half of cooling tower 18.
However, the cooling towers are not iafety releed systems and serve no function during any accident condition.
Here the cooling towers lost as the result of a fi re, this condition would not prevent the safe shutdown of the Unit or maintaining ttA unit in a safe shutdown condition.
The heat sink for the reactor core during shutdown conditions (aormal and emergency) is through the Residual Heat Removal Servic'e Hater (RHRSH) system.
This system is sized such that the cooling towers are not needed to remove the decay heat.
Additionally, the cooling towars are incated far enough away from any safety related structures anJ 1 components, such that were a fire to occur at the cooling towers, no safety related items would be impacted.
In addition to the above informatica, plant engineering personnel performed an engineering eva19dtion of this event.
The evaluation shows that the fire main lobp which protects safety related areas, remained operable.
This conclusion was r;de after reviewing the requirement.
contained in NUREG 75/087 (STANDARD REVIEH PLAN FIRE PROTECTION PROGRAM),
paragraph 5.b.(5).
0105I El-3 01/29/88 SL-3996 700776
L GeorgiaPower A 4 u
ENCLOSURE (Continued)
FIRE HATER STORAGE TANKS CONTAIN LESS THAN 270,000 GALLONS RESULTING IN SPECIAL REPORT AS REOUIRED BY FIRE HAZARDS REPOR_T Even though each of the. fire protection water storage tanks contained less tha'n the required 270,000- gallons, the minimum combined volume they contained in this event was approximately 414,380 gallons.
The NUREG requires that a minimum of 300,000 gallons be available.
Based on the above information, it is concluded this event did not adversely affect the safety related fire protection capability of the plant.
F.
CORRECTIVE ACTIONS The corrective actions for this event included:
1 1.
Isolating the fire suppression header rupture.
2.
Restoring the levels in fire suppression water storage tanks 1Y34-A001A and 1Y34-A0018.
3.
Initiating the appropriate Limiting Condition for t
Operation.
4.
Replacing the ruptured section of the fire suppression t
This occurred on 1/15/88.
- However, the repaired section has not yet been returned to service because inclement weather has prevented the excavated area from being backfilled and properly compacted.
The line will be returned to service after backfilling and compaction are completed.
(
0105I El-4 01/29/88 SL-3906
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