ML20237G067

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Summary of 670815 Meeting W/Util,Westinghouse,Usc&Gs, Newmark & Hall,Phillips Petroleum & Ja Blume & Assoc Re Continued Review of Seismic Design Bases for Plant. Attendees List Encl
ML20237G067
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 08/17/1967
From: Tedesco R
US ATOMIC ENERGY COMMISSION (AEC)
To: Boyd R
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20236J368 List: ... further results
References
FOIA-87-214 NUDOCS 8708130299
Download: ML20237G067 (3)
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'j AU6 I 7 1967 Reger 8. Boyd.'Assistaat Director l for Reacter Projecto, seg, Original signed by Robert L. Tedesco Robert L. Todessei Shief.

Reactor Project Branch 2, agg, j

3CISEIC 93815 SkSES WW D1&E0 SANfW, DOCKET 33. 50-275 l

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A meeting was ha14 en August 15, 1967, with representatives of 7065, MPD and BM.. A list of attendees is attached. The purpose of the  ;

j meeting was to oestimme our review of the seismic design bases fer. the  !

31able Canyon Plant. The prinsipal sapocts 61scussed at the meeting focluded:

(1) the revised earthquaha spectra as submitted by Pett la supplement Es. 3 to its application; and (2) the effects of sembiaed loading resulting from an earthquake Laduced LOCA (simultaaetty of events).

In regard to the utilization of P0bE's revised earthquake spectra, Dr. Neumark again supressed his concera about the magnitude of any margia available for uncertainties in predicting the earthquake his-tory. 706E's approach had beam to consider several typical earthquake response curves and base the station design en the controlling events.

The latter events for design purposes are (1) the "B" or "close-by" i earthquake for the low period range; and (2) the "3" or the large earthquaks on the Nacimiente Fault for the intermediate and high period f

, range. The acceleration magnitudes of the revised spectra were increased ever those originally proposed. The most significant increase being to f

i raise the "B" spectrum fres 0.123 to 0.153 at effectively a zero period.

Additional modifiestions were made to smoothing out the spectra where l ]

' the 9 and B curves intersect.

Although certata changes to the spectra have been proposed by PG6E, Dr. Newmark still' raised questions in terms of the application of the spectra to design. He believas that the combined (B & D) spectre.1 envalepe be used over the entire period range whereas PG&E (J. Blume) proposed to use each spectrum separately for those systems with several degrees of freedom. Agreement is still to be reached between l )

Dr. Neumark and J. Slume en this issue. Dr. Remark's position is l I that, "...the use of two earthquake histories, rather than one combined l history, might lead to higher modal components." It was agreed that PG&E and EPD would work directly with Dr. Neumark to resolve the issue. He webid be kept informed of the progress. We indicated that

[ 8708130299 870729 PDR FOIA \ .

CONNDRB7-214 PDR l L_ ____ ___ _ _

l Roger 8. goyd -t. AUG 17 1967 agreament must be nada, or at least well toward the direction af an-acceptable resolution before our appearance before, the ACRS on this aspec t., Our present plans are for an October meeting with the Committee.

It was revealed by lEFO that its present design, although reported to be " tailored" for the California site, would have to be modified siga nificantly to fellow Dr. Neumark's proposal. IEPD was not willing te consider such changes as na alternative. The problem area is related to the vese=1 internals. The modifiestions necessary would result in a sore design that would met satisfy the propeeed thansal and hydraulia requirements for the high power density performance proposed for P063.

In regard to the second issue 1EFD reported that it would comply with a design basis requirement considering the simultaneity of events; i.e., earthquake and LOCA. It believes that the modifications neces-sary could be implemented without any major design changes. The principal area requiring modification concerns the support saddles in the reactor vessel (under the nessles). game additional redesign would be necessary to the internals. The design limits would be based en sellapse lead limits. We agreed to consider revised limits (i.e.,

compared to code or local yielding). Our criterion considers the preservation of all engineered safety features under such an event.

The meeting closed with the comunitment by PG44 and IEFD that effects of " simultaneity" would be included in the station design criteria.

Additional information would be provided for our review in a subse-quant amendment.

Attachment:

List of Attendees cc P. A. Morris S. Levine D. Skovholt granch Chiefs, DRL Distribution:

Suppl. -('O, DRL Reading RPB 2 Reading Orig: RLTedesco M. M. Mann P. S. Check M. Fairtile R. A. Birkel D. Vassallo

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our> 8/1Q/.Q7.. .. ., ....___ . . . . , ,, _, ,, , , , , , , , , , , , , , . . . _

m AEC 818 (Rev. 443) U.S GovrRNutm ratN7thG ortict leu-o 2i4-629

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AffENDUES AF AUGUST 15, 1967 MEETING JITil PC6E AEC PACIFIC GAS AND ELECTRIC CO.

M. M. Mann P. A. Crane P. A. Morris

  • J. C. Morrissey R. S. Boyd D. V. Kelly S. Levine B. W. Shackelford R. L. Tedesco R. V. Bettinger J. F. Newell W. J. Lindblad R. C. DeYoung R. R. Maccary P. S. Check M. Fairtil-R. A. Birkel l D. B. Vassallo I

NEWMARK & HALL WESTINGHOUSE

! ,/ N. M. Newmark J. R. Stadelman

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R. C. Nichols PilILLIPS PETROLEUM CO. J. D. Stevenson F. N. Moschini C. A. Moore R. A. Wiesemann USC&GS J. A. BLUME & ASSOCIATES L. M. Murphy J. A. Blume

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