ML20215D332

Approves 860716 Request for Application of ASME Code Case N-411-1 Damping Values in Piping Analyses Instead of Values Specified in Fsar.Encl Reg Guide 1.84,Rev 24 Requirements & Commitments Described in 860716 Request Must Be Met

ML20215D332
Person / Time
Site:	Waterford
Issue date:	10/06/1986
From:	Knighton G Office of Nuclear Reactor Regulation
To:	Dewease J LOUISIANA POWER & LIGHT CO.
References
RTR-REGGD-01.084, RTR-REGGD-1.084 NUDOCS 8610140090
Download: ML20215D332 (4)

Text

1

. -i * ., October 6, 1986 4

Docket No.: 50-382 DISTRIBUTION Docket File NRC PDR LPDR Mr. J. G. Dewease PBD7 Reading Senior Vice President - JLee Nuclear Operations JWilson Louisiana Power and Light Company DCrutchfield 317 Baronne St., Mail Unit 17 FJMiraglia New Orleans,-Louisiana 70160 JPartlow BGrimes

Dear Mr. Dewease:

EJordan MHartzman

SUBJECT:

ASME CODE CASE N-411-1 Attorney, OGC ACRS (10)

By letter dated July 16, 1986, Louisiana Power and Light Company submitted a request in accordance with 10 CFR 50.55a(a)(3) for approval to use the damping values stated in ASME Code N-411-1, " Alternative Damping Values for Seismic Analysis of Classes 1, 2, and 3 Piping Sections,Section III, Division 1," as an alternative to the damping values currently specified in the FSAR. Require-ments and conditions for the applicability of this Code Case are stated in Regulatory Guide 1.84, Rev. 24, June 1986 and summarized in Enclosure 1. The staff has . reviewed your request and has determined that if the applicability requirements of Enclosure 1 are met and you fulfill the commitments described in your July 16, 1986 letter, that use of the proposed alternative methodology provides an accepable level of quality and safety and is, therefore, acceptable.

The staff, therefore, approves your request for approval of ASME Code Case N-411-1 for application in Waterford 3 piping analyses.

It is our understanding that you will make the appropriate changes to your FSAR in a future update.

If you have any questions in this regard, contact the Project Manager, J. Wilson at(301)492-8593.

Sincerely,

/s/

George W. Knighton, Director PWR Project Directorate No. 7 Division of PWR Licensing-B

Enclosure:

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i Mr.' Je~rrold G. Dewease Louisiana Power & Light Company Waterford 3 cc:

W. Malcolm Stevenson, Esq. Regional Administrator, Region IV Monroe & Leman U.S. Nuclear Regulatory Commission 1432 Whitney Building Office of Executive Director New Orleans, Louisiana 70103 for Operations 611 Ryan Plaza Drive, Suite 1000 Mr. E. Blake - Arlington, Texas 76011 Shaw, Pittman, Potts and Trowbridge 2300 N Street, NW Carole H. Burstein, Esq.

Washington, D.C. 20037 445 Walnut Street New Orleans, Louisiana 70118 Mr. Gary L. Groesch P. O. Box 791169 Mr. Charles B. Brinkman, Manager New Orleans, Louisiana 70179-1169 Washington Nuclear Operations Combustion Engineering, Inc.

Mr. F. J. Drummond 7910 Woodmont Avenue, Suite 1310 L Project Manager - Nuclear Bethesda, Maryland 20814 Louisiana Power and Light Company 317 Baronne Street

?!ew Orleans, Louisiana 70160 Mr. K. W. Cook huclear Support and Licensing Manager Louisiana Power and Light Company 317 Baronne Street New Orleans, Louisiana 70160 Resident Inspector /Waterford NPS P. O. Box 822 Killona, Louisiana 70066 Mr. Ralph T. Lally Manager of Quality Assurance Middle South Services, Inc.

P. O. Box 61000 New Orleans, Lcuisiana 70161 Chairman Louisiana Public Service Commission One American Place, Suite 1630 t Baton Rouge, Louisiana 70804 L

l

g Enclosure 1 APPLICABILITY OF ASME CODE CASE N-411

1. ASME Code Case N-411 is acceptable for application to piping system analysis under the following conditions:

A. For analyses in new and operating plants which currently use or commit to use all the following criteria:

(1) Current seismic spectra (Regulatory Guide 1.60 or properly justified site spectra), with amplified spectra broadened per Regulatory Guide 1.122.

(2) The envelcpe response spectrum analysis method with Regulatory Guide 1.92 modal and directional combinations, including load contributions from piping system modes with natural frequencies above 33 Hz such that their inclusion does not result in more than a 10% incremental increase in response.

(3) Damping values lower than, or equal to, those from Regulatory Guide 1.61.

B. For the piping segments of a pipin values or damping values from A(3)g system may be used. either N-411ofdamping The mixture both is not acceptable.

C. For equipment only, damping values from A(3) or experimentally deter-mined damping values may be used. Conversely, if the equipment is modelled with the piping using N-411 damping, the analysis results must show that the equipment have no responses below 20 Hz. For piping systems with different damping values for piping segments, equipment and supports, the modal damping values should be determined usingcompositedampingtechniques(ASMECode,SectionIII,AppendixN).

2. The user shall indicate whether the Code Case will be used for new analyses, for reconciliation work, or for support optimization. Due to the increased system flexibility of the system, the following shall be checked and verified for reconciliation or snubber / support optimization work:

a. Adequate clearance with adjacent structures, components and equipment at all locations of maximum predicated displacements.

b. The capability of mounted equipment to withstand the increased motion.

3. Analyses involving the peak shifting technique per ASME Code Case N-397 and N-411 damping are acceptable.

a .

4.- ASME Code Case N-411 is not acceptable for application to piping system analysis under the following conditions:

a. Analysis of piping in which stress corrosion cracking has occurred, unless a case-specific evaluation is made and is reviewed by the staff.

b. Use of the time-history method of dynamic analysis

c. Analysis of piping systems which include energy absorbers designed according to ASME Code Case N-420.

Reference:

Regulatory Guide 1.84, Revision 24 s