ML20138J336

Intervenor Exhibit I-CCANP-95,consisting of 810427 Memo Re Incident Review Committee 810424 Meeting Concerning Primary & Secondary Stress Intensity for Upset Loads in Design of Containment Mechanical Penetrations M9,M13 & M17

ML20138J336
Person / Time
Site:	South Texas
Issue date:	07/18/1985
From:	Powell M HOUSTON LIGHTING & POWER CO.
To:	Jacobi L HOUSTON LIGHTING & POWER CO.
References
OL-I-CCANP-095, OL-I-CCANP-95, NUDOCS 8510290318
Download: ML20138J336 (3)

Text

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P llouston Lighting & Mer Company U **

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3 6,ert incident Review Ccre,ittee (IRC) Meeting Concerning the Primary 8 l Secondary Stress Intensity for tipset loads in the Design of the

. Containr'ent Mechanical Penetrations M9 M13 and M17; April 24 1981 (Item e93) -

. SOUTH TEIAS PROJECT ELECTRIC GENERATitG STAT 10'l i

During a Quadren audit of the specificttion for containtrent riethanical peretration M9. M13 and M17 it was noted that the Primary and Setendary (P P + Q) limit for l'eset conditions were shown in the specification to

• be(+3.3 . The 3.3 factor was <;uestioned since. in general, this limit is typically 3.05m.

MLtP E'ngineering provided the foll:wirg background as to why the 3.3 factor was incorporated into the subject specification:

For the 1974 Editten of AS"E EtPV code, the limits of stress intensity are fwnd in Apcendix I!!! and s;ecifically Figure 3111-1141-1. From this I figure the limit of stress intensity for (P P Q) is given as 3k5m.

Table NC-3217-1 lists values of k that are h+ppr$+priate for verlous lead co-binations. The k-factor for t': set leading condition is 1.1. The use of k 1.1 and 3ksn provide a limit of 3.35m from the 1974 Edition of the code.

Since, as a design limit, the k-factor should not in general be applied to secondary self-eevilibrating leads, the Figure 1111-1141-1 in the 1977

. edition of the code .as redified to provide a limit of stress intensity for (P + Pg + Q) of only 35s.

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Thus, the 3.3 factor was incor; orated as a result of an error in the code.

HLLP Engineering further stated that the Vendor stress report for the subject penetrations had beei reviewej and the Primary and Secondary (P

• P + Q) limit for Uoset conditiers was attually lower than the 3.05m limit byt a fIctor of 3. ,

e in aedition 'B&R is ;rocessing a change to the subject specification to re-flect the code chaa.ge in the 1977 Edition to provide a limit of 3.05m. This limit will be used in futurt vendor stress analyses.

The IRC concluded that no significant safety harard entsts since no penetra-

. tions hcve been desigred with stresses enceeding the 35m limit for Upset conditions. In general, the si:ing of penetrations will be determined by the i Faulted and Rupture loads using primary stress intensity limits (since the

. Upset loads are rot limiting leads). The Secondary loeds are self eeutlibrating i and if a stress intensity bet een 35m and 3.35m should have been evaluated only local yielding w:uld have occurred in the structure not failure. Thus, this ,

item is censidered to be clesed. 3, MEP/ par a

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Atteendees: M. E. Powell J. G. khite R. R. Hernandez J. B. k derson T. H. Crawford A. B. Poole P. 5. Jordan (BLR) cc: G.' W. Opre a , Jr. .

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O. G. Barker J. W. Briskin C. G. Debertson R. A. Fratar

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. R. L. Waldrep J. L. Hawks (B&R)

D. W. Jarecke (B&R)

K. Cook (B&R)

J. D'011ver (B&R)

. H. McGee (B&R)

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