ML18150A141
| ML18150A141 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna, 05000000 |
| Issue date: | 05/28/1987 |
| From: | Engle L Office of Nuclear Reactor Regulation |
| To: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| Shared Package | |
| ML18150A142 | List: |
| References | |
| NUDOCS 8706110156 | |
| Download: ML18150A141 (3) | |
Text
May 28, 1987 Docket Nos. 50-280, 50-281 50-338, 50-339 Mr. W. L. Stewart Vice President - Nuclear Operations Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261
Dear Mr. Stewart:
DISTRIBUTION Docket File NRC PDR Local PDR PD22 Reading S. Varga G. Lainas D. Miller L. Engle C. Patel OGC-Bethesda E. Jordan
\\J. Partlow Tech Branch ACRS ( 10)
Gray File
SUBJECT:
STATISTICAL DNBR EVALUATION METHODOLOGY, VEP-NE-2, SURRY POWER STATION, UNITS NO. 1 & N0.2 (SURRY-1&2)
AND NORTH ANNA POWER STATION, UNITS NO. l& N0.2 (NA-Ht2).
By letter dated October 8, 1985, Virginia Electric and Power Company (VEPCO) submitted topical report VEP-NE-2 "Statistical DNBR Evaluation Methodology."
This report describes VEPCO's methodology for statistically treating several of the important uncertainties in Departure from Nucleate Boiling Ratio (DNBR) analysis.
We have completed our review of the topical report and find it acceptable with the conditions stated in our enclosed Safety Evaluation Report.
The statistical methodology will replace the deterministic methodology which is presently used for DNBR analysis of both the Surry and NA units. Similar statistical methodologies have been used by the three PWR vendors. This re-port includes sample calculations for NA-1&2 based on typical uncertainties.
Plant-specific packages for NA-1&2 and Surry-1&2 which are based on plant-specific data will be submitted, reviewed and approved before this methodology is actually implemented.
The uncertainties used in the plant-specific packages will be justified as part of these packages.
Enclosure:
As stated cc w/enclosure:
See next page
,--- 8706110156 870SQS 1
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PM:'PDII-2 CPatel 5/)'7/87 Sincerely,
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Leon Engle, Project Manager Project Directorate II-2 Division of Reactor Project-I/II Dfftl_2 LRubenstein 5/)[{/87
~r. *w. L. Stewart North Anna Power Station Virginia Electric & Power Company Units 1 and 2 cc:
Richard M. Foster, Esq.
Cockrell, Quinn & Creighton 516 Cherry Tower 920 South Cherry Street Denver, Colorado 80222 Michael W. Maupin, Esq.
Hunton, Williams, Gay and Gibson P.O. Box 1535 Richmond, Virginia 23212 Mr. W. T. Lough Virginia Corporation Co111T1ission Division of Energy Regulation P. O. Box 1197 Richmond, Virginia 23209 Ellyn R. Weiss, Esq.
Hannon, Weiss and Jordan 2001 S Street NW Washington, DC 20009 Mr. J. T. Rhodes Senior Vice President - Power Ops.
Virginia Electric and Power Co.
Post Office Box 26666 Richmond, Virginia 23261 Mr. Patrick A. O'Hare Office of the Attorney General Supreme Court Building 101 North 8th Street Richmond, Virginia 23219 Resident Inspector/North Anna c/o U.S. NRC Senior Resident Inspector Route 2. Box 78 Mineral, Virginia 23117 Atomic Safety and Licensing Appeaf
- Board Panel U.S. Nuclear Regulatory Cormiission Washington, DC 20555 Regional Administrator, Region II U.S. Nuclear Regulatory-Cormiission Office of Executive Director for Operations 101 Marietta Street N.W., Suite 3100 Atlanta, Georgia 30323 Mr. E.W. Harrell P.O. Box 402 Mineral, Virginia 23117 Old Dominion Electric Cooperative c/o Executive Vice Pres.ident Innsbrook Corporate Center 4222 Cox Road, Suite 102 Glen Allen, Virginia 23060 Mr. William C. Porter, Jr.
County Administrator Louisa County P. o. Box 160 Louisa, Virginia 23093
Mr. W. L. Stewart Virginia Electric and Power Company cc:
Mr. Michael W. Maupin Hunton and Williams Post Office Box 1535 Richmond, Virginia 23213 Mr. Robert F. Saunders, Manager Surry Power Station Post Office Box 315 Surry, Virginia 23883 Resident Inspector Surry Power Station U.S. Nuclear Regulatory COJT111ission Post Office Box 166, Route 1 Surry, Virginia. 23883 Mr. Sherlock Holmes, Chairman Board of Supervisors of Surry County Surry County Courthouse Surry, Virginia 23683 W. T. Lough Virginia Corporation Commission Division of Energy Regulation Post Office Box 1197 Richmond, Virginia 23209 Mr. J. T. Rhodes Senior Vice President - Power Ops.
Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261 Regional Administrator, Region II U.S. Nuclear Regulatory Corrmission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30323 James B. Kenley, M.D., Corrmissioner Department of Health 109 Governor Street Richmond, Virginia 23219 Surry Power Station Attorney General Supreme Court Building 101 North 8th Street Richmond, Virginia 23219