ML20138J387

Intervenor Exhibit I-CCANP-94,consisting of 810331 Memo Re Primary & Secondary Stress Intensity of 3.3Sm for Upset Loads.No Deficiency Reportable

ML20138J387
Person / Time
Site:	South Texas
Issue date:	07/18/1985
From:	Poole A HOUSTON LIGHTING & POWER CO.
To:	Powell M HOUSTON LIGHTING & POWER CO.
References
OL-I-CCANP-094, OL-I-CCANP-94, NUDOCS 8510290328
Download: ML20138J387 (2)

Text

-

• M W9 s c 7 -M g/

/

'/ /

}+<pfLj 3]

}

l Houston Lighting & Power Company l

ounc19 e.

,,d.L

[l'Db orritt HEMoRANDUM c/-

re H. E. Powell March 31, 1981

~

ob ST wL 18560 e

A. t. Pcole C2 U F SFN: B-4400 r. p-.E ~ 9 Term

)

7 r

5 6/ect Primary L 5ecendary Stress Intensity of

~M 3.3 9 fer Upset Leads 5OUTH TEsA5 FRC0ECT ELECTRIC GE AERATING STATIC 4 i

The stress entlysis ef ceateia-eet rechealcal Penetrations is provided for in specificatien 2C099N5054 Paragraph 3.2.7 of this specification re-quires the seller to perforn a stress analysis on all penetrations to limits of ASME BLPV c:de. The penel, rations are to be censidered ar;urtenances and I

e-the analysis to be dene to Article NC 32CO. Table 3.1 of the specification lists the design lead ccebinations and various leading c nditions. The ASME BLFV, code is to be the 1974 Edition with Addenda through sumer 1976.

i During the Cuadren eudit it was noted that the Prleary and Secondary (P+y)limitferU;setcenditionswasshownintable3.1ofspecification g

2C099N5054 to be 3.3 Sm. The 3.3 f actor was questioned sinca in general this limit is 3.05m.

For the 1974 Editien of ASME BLPV code. the limits cf stress intensity are fcund in Acrendix Illi and specifically figure !!!!-1141 1.

From this figure the limit of stress intensity for (P *P +Q) is given as 3ksm. Table g t NC-3217-1 lists valCes of k that are accrecriste for varicus lead combina.

tions. The k-fact:r for U: set loading conditien is 1.1.

The use of k=1.1 and 3k5m provide a limit of 3.35m frem the 1974 Edition of the cede.

Since, as a design 11mit, the k-facter should rot in general te applied to secendary self-e;uilibrating leads, the Figure 1111-1141-1 in the 1977 edition cf the code was eedified to prcvide a limit cf stress intensity for (P +P 'EI Cf '"11 3I"*

=

g b The vender stress repert reviewed during the Quadren audit was for penetrations M9, M13 and M17. The (P +P +Q) stress identified in this report g h was lower than the 3.05m limit by a f actor of 3.

BLR is precessing a PCN to r

specification 2CC19NSC54 to reflect the code change in the 1977 Edition to provide a limit of 35m. This limit will be used in future vender analysis.

No deficiency is re;criable fcr this cas: since ne penetratiens have been desigaed with stresses exceeding the 35m limit for U: set cenditions. In general, the sizing cf per.etraticns will be determired by tre Faulted and Rup-primary stress intensity limits. The Secendary loads are ture1cadsusinIna self-equilibrat and if a stress iritensity tet-ten 32; ar.d 3.3*r: thculd h:ve been evaluated only 1ccal yielding would have cecarred in the s'ructure not failure.

6 A3?/kr cc:

J. L. 81tu A. W. Harrisen RECEW'")

J. R. Sur:ter L. R. Jacobi APR 14 Gal 8

J. G. White H. H. Folland L8.)

J. R. Ms11 eda T. E. Poole LR)

D. L. Carat 5tes

$fP R'is file M. E. F0 i %.

8510290328 850718

./

PDR ADOCK 0500049s u2

- ~ _ _ _ _

~

O.,,7

> 0. O)' I ? RJ 31 k.'

PDR Pott no.

00C%A l

~-

~

'~J

sunua moeurou commissi.

N8k cial Exh. Na

~

ed.t h ffi

i. m. -,,,-

DM 17E%1!Fl!D_

Applicant RECEIVID Intervens' MJECTED (cat's Cffr

/[!/

,.stracts' 3 ATE

~

.0 ;r.

w,;,,,

beerter