ML20198F015
| ML20198F015 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 07/24/1975 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | Moore V Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-1079 NUDOCS 8605280389 | |
| Download: ML20198F015 (3) | |
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i JUL 2 4 G7)i I
i Voss A. Moore. Assistant Director for Light Water Reactors, Group 2, RL t
l HYDROLOGIC ENGItPJ' ULING
SUMMARY
(SUPPLEMENT TO SER)
PIANT NAME: WPPSS Nuclear Projects 1 & 4 LICENSING STAGE: CP i
DOCKET NLMBER: 50-460/513 MILESTONE NUMBER: 27-32 RESPONSIBLE BRANCH: LWR 2-3 REQUESTED COMPLETION DATE: July 3, 1975 REVIEW STATUS: Hydrologic Engineering Section, SAB - Complete Enclosed is the hydrologic engineering summary (Supplement to SER),
prepared by G. Staley and E. Hewkins. This supplement constitutes our review of the applicant's revised Ultimate Heat Sink (CHS) analysis contained in Amendment 19, received July 10, 1975. We have found the UHS to be acceptable and this resolves our 1 set open item on the WPPSS 1/4 plant.
Odgeal Lgnd by H E,teaton Harold R. Denton, Aasistant Director for Site Safety Division of Technical Review Office of Nuclear Ranctor Regulation i
Enclosure s -
As stated Distribution:
cc: w/o enclosure CCentra131em A. Giambusso bnx/neading File l
W. Mcdonald SAB/ Reading File I
J. Panzarells' w/ enclosure S. Hanauer G. Staley R. Heineman E. Hawkins l
H. Denton R. Klecker l
SS Branch Chiefs S. Varga l
A. Schwencer D. Eisenhut
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.We have made an independent analysis of the Ultimate Heat Sink (URS) i based on the revised information contained in Amendment No. 19 to s
the PSAR. Table ~l shous a comparison of pertinent data used by the staff and the applicant in the transient analysis of the UHS.
The_results of our analysis show that the pond will reach a peak lP temperature of about 101*F, about 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> after the design basis accident.
It was conservatively estimated that about 8,900,000 gallons of water l
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uill be losc from the pond in a 30 day period. This will drop the pond surface about 16 feet,' but there vill still be sufficient depth (about 14 feet) to provide the required minimum submergence (9 feet) i for the pumps. The staff concludes that the spray ponds vill provide water at an acceptabl.c temperature for a period of at least 30 days under emargency shutdown conditions.
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TABLE 1 NRC Applicant Item Staff Value Value Pond' Volume (gal) 12,800,000 12,970,000 2
Pond Area (ft )
74,500 75,000 Dry Bulb Temp (*F)
Case I * -
82.9 82.9 Case II
- 82.8 S2.8 Wet Bulb Temp (*F)
Case.I 61
$9 Case II 66 61 Relative Humid!,ty (%)
Case I 22
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Case II 40.5
?
Wind Speed (MPH)
Case I 9.6 5.54 Case II 6.8 5.52 2
Solar Radiation (Btu /ft day) 2650 2650 Nozzle Spray Efficiency (%)
25 25 Drift Loss (%)
Case I
.7
.35 Case II
.4
.35 Predicted Max. Pond Temp. (*F) 101 98.6 I
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- Case I - Maximum Water Use Case II - Maximum Pond Temperature
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