ML20138P233

Advises That 851021 Request for Authorization to Use ASME Code Case N-411 for Application in Response Spectrum Seismic Analysis of Piping Sys Acceptable.Use Will Be Documented in Future FSAR Amend

ML20138P233
Person / Time
Site:	North Anna
Issue date:	12/20/1985
From:	Engle L Office of Nuclear Reactor Regulation
To:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
References
NUDOCS 8512240401
Download: ML20138P233 (3)

Text

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• December 20, 1985 Docket Nos. 50-338 DISTRIBUTION:

50-339 sDocket Nos.;50_-338,>339 y NRC PDR LEngle Local PDR LRubenstein Mr. W. L. Stewart PAD #2 R/F PKreutzer Vice President - Nuclear Operations HThompson ACRS (10) 0 ELD Tech. Branch Virginia Electric Post Office and Power Company' ,

Box 26666 EJordan Gray File Richmond, Virginia 23261 BGrimes

.s JPartlow

SUBJECT:

Proposed Changes to Damping Values for Seismic Analysis of Piping - North Anna Power Station, Units No. I and No. 2 (NA-1&2)

We have completed our review of the Virginia Electric and Power Company (VEPC0) request for authorization to use ASME Code Case N-411 for applica-tion in the response spectrum seismic analysis of piping systems at NA-1&2, as discussed in the VEPC0 letter (Secial No.85-706) dated October 21, 1985.

1 Code Case N-411, " Alternative Damping Values for Seismic Analysis of Piping,Section III, Division I, Class 1, 2 and 3 Construction" 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 comitments:

(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 recon-ciliation work and for support optimization.

(c) Due to increased flexibility of the system, commit tr, check all I system predicted maximum displacements for adequate clearance with I

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.

. VEPC0 has complied with these comitments in the letter of October 21, 1985.

l Therefore, we find the request to use Code Case N-411 to be acceptable for l

l l 8512240401 851220 9 PDR ADOCK 05000338 i P ,

PDR e

W Mr. W. L. Stewart use at NA-182. The use of Code Case N-411 should be documented in a future amendment to the NA-1&2 Updated Final Safety Analysis Report.

Sincerely,

/s/

Leon B. Engle, Project Manager PWR Project Directorate #2 Division of PWR Licensing-A Office of Nuclear Reactor Regulation cc: See next page b

0FC :LA:PBD-8 :PMiVRU #2 :PD: PAD #2  :  :  : .'

NAME :PKreutzer :LEngle;bg :LRGb 1 in :  :  :  :

_____:____________:____________:-______L __:____________:____________:____________:___________

DATE:12/l%/85 :12/18V85 :12//4/85  :  :  :  :

1 0FFICIAL RECORD COPY t

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. i Mr. W. L. Stewart North Anna Power Station Virginia Electric & Power Company Richard M. Foster, Esq. Atomic Safety and Licensing Appeal Musick, Williamson, Schwartz, Board Panel Leavenworth & Cope, P.C. U.S. Nuclear Regulatory Commission P.O. Box 4579 Washington, DC 20555 Boulder, Colorado 80306 Regional Administrator Michael W. Mauphin, Esq. USNRC, Region II Hunton, Williams, Gay and Gibson Office of Executive Director P.O. Box 1535 for Operations Richmond, Virginia 23212 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Mr. W. T. Lough Virginia Corporation Commission Mr. E. W. Harrell Division of Energy Regulation P.O. Box 402 P.O. Box 1197 Mineral, Virginia 23117 Richmond, Virginia 23209 Old Dominion Electric Cooperative Ellyn R. Weiss, Esq. c/o Executive Vice President Sheldon, Harman, Roisman and Weiss Innsbrook Corporate Center 1725 I Street, N.W., Suite 506 4222 Cox Road, Suite 102 Washington, DC 20006 Glen Allen, Virginia 23060 Mr. J. H. Ferguson Mr. Richard C. Klepper Executive Vice President - Power Board of Supervisors Virginia Electric and Power Co. Louisa County Courthouse Post Office Box 26666 P.O. Box 27 Richmond, Virginia 23261 Louisa, Virginia 23093 Mr. Anthony Gambardella 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 Mrs. Margaret Dietrich Route 2, Box 568 Gordonsville, Virginia 22042 Mr. Paul W. Purdom Environmental Studies Institute Drexel University 32nd and Chestnut Streets Philadelphia, Pennsylvania 19104 L