ML20137L059

Nonproprietary Supplementary Info to WCAP-10585, Technical Bases for Eliminating Large Primary Loop Pipe Rupture on Structural Region Bases for McGuire Units 1 & 2

ML20137L059
Person / Time
Site:	Mcguire, McGuire
Issue date:	12/31/1985
From:	Chirigos J, Swamy S, Witt F WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML19273A741	List: ML20137L019 ML20137L039 ML20137L059
References
TAC-59960, TAC-59961, WCAP-10585-ERR, NUDOCS 8601240342
Download: ML20137L059 (4)

Text

.

. WESTINGHOUSE PROPRIETARY CLASS 3 ,

Supplementary Information to WCAP-10585, Technical Bases for Eliminating large Primary Loop Pipe Rupture on the Structural Design

! Basis for McGuire Units 1 and 2 J

December 1985

S. A. Swamy F. J. Witt L

APPROVED:

J.IN. t bAID 11rigos, Mai49eJ/

APPROVED:

E. R. Johnson, Manager Structural Materials i* Structural and Seismic Engineering Development APPROVED: 1 kbm J. '3! ~McVerney, Manaig Mechanical Equipment ahd i Systems Licensing ,

i i i

I WESTINGHOUSE ELECTRIC CORPORATION Nuclear Energy Systems P.O. Box 355 Pittsburgh, Pennsylvania 15230 l

0601240342 e60116 DR ADOCK 0 % g9

f DETERMINATION OF J APPLIED R MIRE UW 12 2 In WCAP-10585 (Technical Basis for Eliminating Large Primary Loop Pipe Rupture as the Structural Design Basis for McGuire Units 1 and 2), a

comparison was made between the critical pipe section of the McGuire loop and j the generic pipe section analyzed in WCAP-9558, Revision 2. The generic loop section was found to envelope the McGuire piping. However, such an

enveloping evaluation provides little insight for margin analyses. Thus it became necessary to perform analyses and evaluations more typical of the McGuire piping. Specifically, the followirg analyses were performed.

i 1. Adopting a yield stress of [ Ja ,c eksi for the aged piping material" of the McGuire plants and a tangent modulus of ( 38 'c eksib , ,pgp, similar to that in WCAP-9558, Revision 2, was analyzed for 8 'C

circurferential through wall cracks of 7.5 and [ 3 inches.

2. To account for small differences in gemetry, J is plotted versus the elastica 11y calculated axial stress instead of J versus moment as was done in WCAP-9558, Revision 2.

J versus outer fiber axial stress for the two fir. sizes are given in Figures 1 and 2. As may be seen, for a stress of 26.70 ksi, J is around

! [ la,c,ein-lb/in 2for a 7.5 inch flaw, and around [ la c.ein-Ib/in2 for a[ Ja,c.eirich flaw. Thusly, was margin in flaw size established.

• The code mininan yield of the unaged material at the critical location in WCAP-10585 is 21.2 ksi.

b 8 In WCAP-9558, Revision 2, the yield stress was [ 3 'c.eksi and the tangent modulus of the 2nd part of the multilinear stress strain diagran was [ 38 '*ksi (see Figure 3 1, page 3-9 of WCAP-9558, Revision 2) l l

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- . . - - . . . , - ,.- . --- --.--- - - . , - . - ~ ~ . - - . - - , - - - - . - . _ . - . , - , , - - . .-

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i Figure 1 J versus the outer fiber axial stress for a [

wall circumferential flaw ]a.c.e inch long through l

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2

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I Figure 2 J versus the outer fiber axial stress for a [ 3a,c.c inch long through wall circumferential flaw