ML18144A048
| ML18144A048 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/04/1985 |
| From: | Rubenstein L Office of Nuclear Reactor Regulation |
| To: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8512130231 | |
| Download: ML18144A048 (4) | |
Text
Docket Nos. 50-280 and 50-281 Mr. W. L. Stewart e
December 4, 1985 Vice President - Nuclear Operations Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261
Dear Mr. Stewart:
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H. Thompson OELD B. Grimes ACRS 10 C. Parrish NRC PDR Gray File ORB#l Rdg E. Jordan J. Partlow D. McDonald
SUBJECT:
PROPOSED CHANGES TO DAMPING VALUES FOR SEISMIC ANALYSIS OF PIPING - SURRY POWER STATION, UNIT NOS. 1 AND 2 We have completed our review of the Virginia Electric and Power Company (VEPCO) request for authorization to use ASME Code Case N-411 for application in the response spectrum seismic analysis of piping systems at the Surry Power Station, Unit Nos. 1 and 2, as discussed in the VEPCO letter, Serial No.85-705, dated October 21, 1985.
Code Case N-411, 11Alternative Damping Values for Seismic Analysis of Piping,Section III, Division I, Class 1, 2 and 3 Construction 11 is a conditionally acceptable Code Case and is approved by the staff for specific plant applications pending revision of Regulatory Guide 1.61.
Licensees wishing to use this Code Case were encouraged to submit in their request the following information or commitments:
(a)
Commit to use the case for piping systems analyzed by response spectrum methods and not those using time-history analysis methods.
(b)
Indicate if the case is to be used for new analyses or for reconciliation work and for support optimization.
(c)
Due to increased flexibility of the system commit to check all system predicted maximum displacements for adequate clearance with adjacent structures, components and equipment, and that the mounted equipment can withstand the increased motion.
(d)
When the alternate damping criteria of this Code Case are used, they will be used in their entirety in a given analysis and shall not be a mixture of Regulatory Guide 1.61 criteria and the alternate criteria of this Code Case.
VEPCO has complied with these commitments in the letter of October 21, 1985.
Therefore, we find the request to use Code Case N-411 to be acceptable for use at the Surry Power Station, Unit Nos. 1 and 2.
8512130231 851204 PDR ADOCK 05000280 P
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Mr. W. December 4, 1985 The use of Code Case N-411 should be documented in a future amendment to the Updated Final Safety Analysis Report.
cc: See next page Sincerely,
/s/LSRubenstein Lester s. Rubenstein, Dtre_cto:r PWR Project Directorate #2 Division of PWR Licensing-A
- SEE ATTACHED CONCURRENCE
- ORB#l:DL CParrish ll/2185 PWR#2-A TChan;ps 11/'l/85
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- BC-ORB#l:DL SVarga D/PWR#2-A LRubenstein 11~~85
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Mr. W. The use of Code Case N-411 should be documented in a future amendment to the Updated Final Safety Analysis Report.
cc: See next page
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ORB#l:D~ ORB#l:DL CParrish TChan;ps 11/tl/85 ll/,2j/85 I
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Sincerely,
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I Steven A. Varga, Chief Operating/./Reactors Branch #1 Division1of Licensing
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e Mr. W. L. Stewart Virginia Electric and Power Company cc:
Mr. Michael ij. 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 Donald J. Burke, Resident Inspector Surry Power Station U.S. *Nuclear Regulatory Corrmission 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 Corrmission Division of Energy Regulation Post Office Box 1197 Richmond, Virginia 23209 Mr. J. H. Ferguson Executive Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261 Regional Administrator, Region II U.S. Nuclear Regulatory Corrmission Suite 2900 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 James B. Kenley, M.D., Co111T1issioner Department of Health 109 Governor Street Richmond, Virginia 23219 Surry Power Station Attorney General Supreme Court Building 101 North 8th Street Richmond, Virginia 23219