ML20138J336
| 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) | |
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P; llouston Lighting & Mer Company U **
4 ril 27. 1981.
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ofract Mtuon ANDuw ST-HL 18123 SFN: V-0530' h
LR. M1 M. E. Powelkk[
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6em 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 + P + 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 by a fIctor of 3.
t in aedition 'B&R is ;rocessing a change to the subject specification to re-e 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.
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liouston Ligliting & Power Company OFFICE MEMOR ANDUM g gg T) 5FN: V-0530 I
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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.
J. H. Goldberg '
O. G. Barker J. W. Briskin C. G. Debertson R. A. Fratar J. L. Blau H. J. Sweeney T. J. Jordan 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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