ML20235M955
| ML20235M955 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 02/24/1989 |
| From: | Bailey J GEORGIA POWER CO., SOUTHERN COMPANY SERVICES, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GN-1581, NUDOCS 8902280517 | |
| Download: ML20235M955 (4) | |
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m Georgia Power Company
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Post Office Box 282 J4l/
Waynesboro. Georgia 30830
- Telephone 404 $$4M61.
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404 724-8114 Southern Company Services, Inc Post Office Box 2625 Birmingham, Alabama 35202 Telephone 205*8746011 V0gtle Project
(
February 24,'i989 U. S. Nuclear Regulatory Commission t
L ATTN:
Document control Desk File:
X7BC35 j'
Washington, D. G.
20555 Log:
GN-1581 L
PLANT V0 GILE - UNIT 2 NRC DOCKET NUMBER 50-425 OPERATING LICENSE NUMBER NPF 79 RAI: FSAR CHAPTER 14 NSCW NPSH EVALUATION Gebtlemen:
Georgia Power. Company letter GN-1566 dated January 27, 1989, stated that-we were performing an evaluation using the Unit 1 and Unit 2 test data to verify.the Unit.2 nuclear service cooling water (NSCW) pumps net positive suction head (NPSH) would be acceptable at a 4.5 foot basin level. This evaluation is now complete and is summarized in the attachment.
The results inidicate that the Unit 2 pumps will have discharge pressures similar to the Unit 1 pumps at the 4.5 foot basin water level.
If you should require additional 'information, please do not hesitate to centact me.
Sincere 1,
f f
- (d. W
>J.-A. Bailey Project Licensing Menager JAB /pwh Attachment xc:
NRC Regional Administrator NRC Resident Inspector P. D. Rice J. P. Kane R. A. Thomas B. W. Churchill J. E. Joiner J. B. Hopkins (2)
G. Bockhold, J r.
R. J. Goodard R. W. McManus Vogtle Project File 1\\
w" 8902200517 390 25 PDR ADOCK O pg l
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M ATTACHMENT EVALUATION OF NSCW NPSH DATA As described in letter GN-1566 of January 27, 1989, at, evalaution of the NSCW data from Unit 1 and Unit 2 has been performed which verifies that the Unit 2 pump performance is acceptable at the j
basin level of the Unit 1 NPSH test.
This evaluation is based on the. fact that the actual performance head characteristics of the NSCW pumps for Unit 1 and Unit 2 are essentially the same.
In the following steps we have extrapolated the head of the Unit 2 pumps at the normal operating levels down to the level of the Unit 1
)
NPSH pump runs and ~we compared the extrapolated Unit 2 pump 1
discharge pressure to the actual Unit 1 discharge pressure at the same basin level.
Total Developed Head (TDH) - Discharge Pressure - Suction Pressure-
+ gage elevation correction.
Discharne Preasures l
114 psig 263.3 ft.
Preop run (Unit 2) Pumps 1 & 3 170.9 ft.
74 psig NPSH Test (Unit 1) Pump 1 164.0 ft.
71 psig Pump 3-
. Suction Pressures i
Normal level for preop run Unit 2 85' head above impeller 217.5' elevation
. Elevation of pump impeller 132.5' elevation Level for NPSH Test 9' head above impeller l '
141.5' elevation l
Gare Elevation CorrectiqD l
l Elevation of discharge pressure gage for preop 76.5' head above impeller 209' elevation Elevation of discharge pressure gage for NPSH test -
90' of head above inpeller 222.5' elevation l! nit 2 Pumu TDH TDH - Discharge Pressure - Suction Pressure + Cage Elevation Cor.
l TDH - 263.3' -
8S'
+
76.5' l
254.E' 3DH - 263.3 8.5
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t-Unit-2 Pumo Extrapolation to NPSH Test Level TDH - Discharge Pressure - Suction Pressure + Cage Elevation Cor.
I
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-254.8' - Discharge Pressure - 9'
+ 90' j
Discharge Pressure - 254.8 + 9 173.8' or 75.2 psig This elvaluation concludes that the Unit 2 extrapolated pump discharge pressure for pumps 1 and 3 is 75.2 psig as compared to the actual Unit 1 pump dis. charge pressures of 74 and 71 psig for pumps 1 and 3.
Acceptable results would also be obtained for the other Unit 2 pumps.
This discharge pressure for the Unit 2 pumps as well as the similar piping design of the' Unit 1 and 2 NSCW j
systems indicates that the Unit 2 NSCW pumps will successfully operate at the NPSH water elevation of 141.5'.
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