ML20154P809

Comments on Util 851108 Request for Authorization to Apply ASME Nuclear Component Code Cases N-411 & N-397 to Piping Reanalyses Used to Optimize Number of Snubbers Used in Piping Sys.Subj Code Cases Conditionally Acceptable

ML20154P809
Person / Time
Site:	Peach Bottom
Issue date:	03/14/1986
From:	Muller D Office of Nuclear Reactor Regulation
To:	Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
References
NUDOCS 8603200420
Download: ML20154P809 (3)

Text

.

Docket flos. : 50-277/278 fir. E. G. Bauer, Jr.

Vice President and General Counsel g 14 g Philadelphia Electric Conpany 2301 !!arket Street Philadelphia, Pennsylvania 19101

SUBJECT:

USE OF ASME CODE CASES N-411 AND N-397 FOR PIPIfiG ANALYSIS -

PEACH BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 By letter dated November 8,1985, the Philadelphia Electric Company (PECo) requested authorization to apply ASf1E Nuclear Component Code Cases fi-411 and N-397 to piping reanalyses for Peach Bottom Units 2 and 3. The purpose of these reanalyses is to optimize the number of snubbers used in piping systems.

These reanalyses shall be performed according to the NRC Piping Review Comittee recentended methodology delineated in NUREG-1061, Vol. 5, published in April 1985. Part of the recommended methodology are contained in ASME Code Cases it-411, " Alternative Damping Values for Seismic Analysis of Piping,Section III, Division 1, Class 1, 2, and 3 Construction," and N-397,

" Alternative Rules to the Spectra Broadening Procedures of fi-1226.3 for Class 1, 2, and 3 Piping,Section III, Division 1."

Code Case N-411 is a conditionally acceptable Code Case. Its use is approved by the staff for specific plant applications, pending a revision of Regulatory Guide 1.61, when the following information and commitments are provided:

1) The application of the Code Case shall be limited to piping systems analyzed by the response spectrun method only.

2) The alternate damping criteria of the Code Case shall be used in their entirety in any given analysis. The mixed application of the Code Case and Regulatory Guide 1.61 is not permitted.

3) Due to the increased flexibility of the system, the user shall check all recalculated displacements to verify there is adequate clearance between the piping system and adjacent structures, components, and equipment, and to verify the ability of mounted equipment to withstand the increased motion.

4) The user shall clearly indicate whether the Code Case will be used for new analyses, for reconciliation work, or for support optimization.

8603200420Og30 77 PDR ADOCK O PDR P

1 lir. E. G. Bauer, Jr. I 1

Code Case N-397 is an acceptable conditionally Code Case. It has been

! accepted by Regulatory Guide 1.84 for application to all piping analyses using l the response spectrum method.

j In the referenced letter, PECo made the necessary commitments, identified t

above, for the application of Code Case N-411. Also, the Code Cases will be used in an acceptable application, i.e., piping stress analyses using the

! response spectrum method. Therefore, the staff concludes it is acceptable to i use Code Cases N-411 and N-397 for the Peach Bottom Units 2 and 3 snubber l optimization (reduction) program. The approved application is restricted to

! piping analyses for the purpose of reducing the number of snubbers. This i approval does not include application of these Code Cases to equipment analyses, or to piping analyses when energy absorbers are included in the i stress analysis model.

j If you have any questions concerning this matter, please contact us.

! Sincerely C.W.m! t.fcned by C4.ticl R.tdulier a i

Daniel R. Muller, Director

! BWR Project Directorate #2

, Division of BWR Licensing 1

l cc: See next page I DISTRIBUTION i 4ocket#Of D

PDR/LPDR RBernero j OELD

! EJordan

! BGrimes j JPartlow

{ GGears

! SNorris l ACRS (10) i Ted 9 m h l Gray File i

10FC : DBL:PD#2  : DBL:PD#2  : .LD . DBL:PD#2  :  :  :

!____.:.._________:p___________:______..:___________:___________.

{NAME:Sti  : wap : :D pr  :  :  :

. _ _ _ _ _ : _ _ _ _ _ _ _ _ . _ _ _ f: . ..____:_. ____ ___:____________:____________:.___________:___________

DATE

3/JS/86 M/s 6  : /86 :3//V/86 - - -  !

t

! 0FFICIAL RECORD COPY i

r

Mr. E. G. Bauer, Jr. Peoch Botton Atomic Power Station, Philadelphia Electric Company Units 2 and 3 CC:

Mr. Eugene J. Bradley Mr. R. A. Heiss, Coordinator Assistant General Counsel Pennsylvania State Clearinghouse

! Philadelphia Electric Company Governor's Office of State Planning 2301 Market Street and Development

! Philadelphia, Pennsylvania 19101 P.O. Box 1323 Harrisburg, Pennsylvania 17120 Troy B. Conner, Jr. , Esq.

1747 Pennsylvania Avenue, N.H. Mr. Thomas M. Gerusky, Director Washington, D.C. 20006 Bureau of Radiation Protection Pennsylvania Departeant of Thomas A. Deming, Esq.

Environmental Resol >ces Assistant Attorney General P.O. Box 2063 Department of Natural Resources Harrisburg, Pennsylvania 17120 Annapolis, Maryland 21401 Mr. Albert R. Steel, Chairman Philadelphia Electric Company Board of Supervisors ATTN: Mr. R. Fleishmann Peach Bottom Township Peach Bottom Atomic R. D. #1 Power Station Delta, Pennsylvania 17314 Delta, Pennsylvania 17314 Mr. M. J. Cooney, Superintendent Generation Division - Nuclear Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 Mr. Anthony J. Pietrofitta, General Manager Power Production Engineering Atlantic Electric P. O. Box 1500 1199 Black Horse Pike Pleasantville, New Jersey 08232 Resident Inspector U.S. Nuclear Regulatory Commission Peach Bottom Atomic Power Station P.O. Box 399 Delta, Pennsylvania 17314 Regional Administrator, Region I i U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

._- . . - _. .- . _ . , _ _ - _ -_.. __ _ . _ _ _ . __