ML20212D780

Summary of 861215 Meeting W/Util,Bechtel & Westinghouse Re Use of Multiple Response Spectrum Methodology in Combination W/Use of ASME Code Case N-411 Damping Values.List of Participants Encl

ML20212D780
Person / Time
Site:	Vogtle
Issue date:	12/23/1986
From:	Mark Miller Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8701050023
Download: ML20212D780 (5)

Text

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/* \* n UNITED STATES NUCLEAR REGULATORY COMMISSION O p WASHINGTON, D. C. 20555

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p 3 DEC 1986 Cocket t,'es. : 50-424 and 50-425 l

APPLICANT: Georgia Power Company

FACILITY

Vogtle Units 1 and 2 I

SUMMARY

OF MEETING HELD DECEMBER 15, 1986, ON fULTIPLE j RESPONSE SPECTRUM METHODOLOGY On December 15, 1986, the staff met with the applicant and its representatives to discuss the use of multiple response spectrum (PRS) methodology in comb-ination with the use of N-411 damping values. Participants are listed in the enclosure.

The aprlicant stated that MRS methodology was approved by the staff prior to appioval of use of Code Case N-411 which did not mention any restrictions regarding MRS. The staff indicated that its position regarding MRS and N-411 i is stated in RG 1.84, Revision 24 The applicant stated that before the meeting it reviewed 1 Westinghouse and 3 l Cechtel calculation packages. Bechtel calculations used an enveloping response spectrum in combination with N-411 damping values. Westinghouse used MRS methodology (absolute sum) with RG 1.61 damping values. The applicant under-stands that either method is acceptable to the staff. The preliminary results of the applicant's review of these calculation packages is suninarized below.

Bechtel: (1) Pipe stresses are all within allowables.

, (2) Of 593 supports, 3 cases require further study.

(a) 1 snubber pair: exceeded OBE allowable by 7%.

(b) 1 strut: exceeded OBE allowable by 11.3%.

(c) I baseplate load: exceeded SSE allowable by 8%.

(3) 2 main steamline safety relief valves exceed the equipment qualification acceleration limit.

(4) I equipment nozzle exceeds vendor allowables (OBE by 30%, SSE by 30%).

(5) Functionally requirement is exceeded by 10.4% in 1 pipe locaticn (6) There is no impact on pipe break locations Westinghouse: (1) Pipe stresses are all within allowables (2) 23 supports require further evaluation. This effort is complete for 14 supports. Thus far, l

(a) 1 support exceeds deflection limit by 0.008" and l also has an embed problem (b) 1 strut limit is exceeded by 720 lbs. (3%)

(c) I hanger has a structural steel problem 8701050023 861223 PDR ADOCK 05000424 A PDR i

The applicant proposes to complete its preliminary evaluation including evaluation of supports' acceptability. The applicant stated that it does not have time before fuel load to resolve issues with vendors in Bechtel items (3) and (4). The applicant further proposes to enuraerate problem but not make any hardware or EQDP changes until mid-1987 when a decision between NRC and industry is expected on this issue.

The staff informed the applicant that it would need to fix the baseplate and strut as well as further evaluate the safety relief valves and equipment nozzle.

TFe FSAR should also be modified to reflect the use of either enveloping response spectrum plus N-411 damping values or MRS methodology plus RG 1,61 damping values for all subsequent applications.

The applicant indicated that a submittal would be forthecming by December 23.

Melanie A. Miller, Project Manager PWR Project Directorate #4 Division of PUR Licensing-A Enciosure: As stated cc: See next page i

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OP^WR-A PAEB/DPL'P PWR#4/DPWR-A 11 er/ rad dBranmer BdYoungblood 1247/86 12/N86 12/f}/86

Mr. J. P. O'Reilly Georgia Power Company Vogtle Electric Generating Plant cc:

!!r. L. T. Gucwa Resident Inspector Chief Nuclear Engineer Nuclear Regulatory Cormission Georgia Power Ccrpany P. O. Box 572 P.O. Box 4545 Waynesboro, Georgia 30830 Atlanta, Georgia 30302 Mr. Ruble A. Thomas Deppish Kirkland, III, Counsel Vice President - Licensing Office of the Consumers' Utility Vogtle Project Council Georgia Power Company / Suite 225 Southern Company Services, Inc. 32 Peachtree Street, N.W.

P.O. Box 2625 Atlanta, Georgia 30303 Birmingham, Alabama 35202 James E. Joiner Mr. Donald O. Foster Troutman, Sanders, Lockerman, Vice President & Project General Manager & Ashmore Georgia Power Company Candler Puflding Post Office Box 299A, Route 2 127 Peachtree Street, N.E.

Uaynesboro, Georgia 30830 Atlanta, Georgia 30303 Danny Feig Mr. J. A. Bailey 1130 Alta Avenue Project Licensing Manager Atlanta, Georgia 30307 Southern Company Services, Inc.

P.O. Box 2625 Carol Stangler Birraingham, Alabama 35202 Georgians Against Nuclear Energy 425 Euclid Terrace Ernest L. Blake, Jr. Atlanta, Georgia 30307 Bruce W. Churchill, Esq.

Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.U.

Washington, D. C. 20037 Mr. G. Bockhold, Jr.

Vogtle Plant Manager

'Ccorgia Power Company Route 2, Box 299-A Waynesboro, Georgia 30830 Regional Administrator, Pegion II U.S. huclear Regulatory Commission 101 f tarietta Street, N.W. , Suite 2900 Atlanta, Georgia 30323 Mr. R. E. Conway Senior Vice President and Project Director Georgia Power Company Rt. 2, P. O. Box 299A Waynesboro, Georgia 30830 l

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[ _,4-l Enclosure Participants

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NRC BECHTEL j M. Miller G. Wang

. J. Bramer D. Capito G. Bagchi R. Rogers l- R. LaGrange ~ T. Yuan M. Hartzman i

_SOU_THERN COMPANY SERVICES ^ WESTIf GH00SE

0. Batum K. Chang R. Thomas

, J. Dailey l

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f1EETING

SUMMARY

DISTRIBUTION TH1 NRC Participants

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RRC Q"" } M. Miller L PDR J. Brammer NSIC G. Bagchi PRC System R. LaGrange PWR#4 Reading File M. Hartzman M. Duncan OGC-Bethesda J. Partlow E.~ Jordan B. Grines ACRS (10)

OTHERS bcc: Licensee & Service List