ML19296C619
| ML19296C619 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/25/1980 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Parr O Office of Nuclear Reactor Regulation |
| References | |
| 142, NUDOCS 8002260724 | |
| Download: ML19296C619 (2) | |
Text
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Vr uo r xrA ELecTurc ann Pow e n Com msy Ric n> ton n,VIHGIN 1 A u Uu f3 x February 25, 1980 Mr. Harold R. Denton, Director Serial No. 142 Office of Nuclear Reactor Regulation LQA/WRM:rab Attn:
Mr. Olan D. Parr, Chief Light Water Reactors Branch No. 3 Docket No. 50-339 Division of Project Management U. S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Denton:
NORTH ANNA POWER STATION UNIT 2 CASING COOLING PUMP DISCHARGE PRESSURE The Virginia Electric and Power Company submits the following information on the Technical Specification casing cooling pump discharge pressure value for North Anna Power Station Unit 2.
The casing cooling pumps used in Unit 1 were pumps purchased for Units 3 and 4.
The Unit 1 casing cooling system was designed and orificed to accommodate these pumps and provide the required flow for outside recirculation spray pump operation, The casing cooling pumps for Unit 2 were purchased specifically for Unit 2 use and are from a different vendor.
As with Unit 1, the specific system design assures that the required flow is delivered to the outside recirculation spray pumps.
The specific point used for the Technical Specification dis-charge pressure value was recieculation at the design point on the head curve.
Specifically, this is 1000 gallons per minute at 100 feet (total developed head). Using standard hydraulic formulae, the following was obtained:
Total Head + Suction Head - Elevation of Discharge Pressure Gage + Elevation of Suction Pressure Cage - Friction Losses Between Pump and Pressure Gages - Velocity Losses = Discharge Head 100 + 23.54 - 4.3 + 4.3 - 0.45 - 1.23 = 121.86 ft.
E 53 psig Tso o 226o424
Viutpxtr EucTaic Avu Powen COMPANY TO Mr. liarold R. Denton 2
Section XI of the AS!E Code allows AP to degrade to 93% of the nominal, the re fo re, the Technical Specification allowable should be greater than 46 psig.
If you require any additional infomation, please contact this office.
Very truly yours, C. M. Stallings Vice President-Power Supply and Production Operations