ML19305A105

Forwards Page 2 of Criteria for Combination of Earthquake &/Or Other Transient Responses Inadvertently Left Out of Some Copies Transmitted on 781220 from M Fate to SA Varga

ML19305A105
Person / Time
Site:	Black Fox
Issue date:	12/29/1978
From:	Conrad V PUBLIC SERVICE CO. OF OKLAHOMA
To:	Varga S Office of Nuclear Reactor Regulation
References
6212DIN8-014040, 6212DIN8-14040, NUDOCS 7901040132
Download: ML19305A105 (4)

Text

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6 212 DIN 8 -014 - 040 PUBLIC SElWICE COMPANY OF OKLAHOMA A CENTRAL AND SOUTH WEST COMPANY P O BOX 201/ TULSA. OKLAHOMA 74102 / (918) 583-3611 Public Service Company of Oklahoma Dece:nber 29, 1978 Black Fox Station File 6212.125.3500.21L Transmittal of Omitted Material From Previous Correspondence 3 Docket STN 50-556 and STN 50-557 Office of Nuclear Reactor Regulation Division of Project Management Light Water Reactors Branch No. 4 '

U.S. Nuclear Regulatory Commissi,on Washington, D. C. 20555 Attention: Steven A. Varga, Chief Gentlemen: ,

Please find enclosed the two page document entitled " Criteria for Combinations of Earthquake and/or Other Transient Responses" referred to as the "Newmark -

Kennedy Criteria". The second page of this document was inadvertently left out of some copies of the t'ransmittal of December 20, 1978 from Martin Fate to Steven A. Varga on "Methology for Combining Dynamic Responses of Structures Systems and Components Important to Safety".

Please include this information with the above correspondence.

Very truly yours,

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V. L. Co rad, Manager

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2 October 1978 CRITERIA FOR COM8INATIONS OF EARTHQUAKE ,

AND/OR OTHER TRANSIENT RESPONSES -

Preamble.

The intent of the methods proposed f,or combinations of transient, dynamic responses is to achieve a non exceedance probability of approx-imately 84 percent for the peak combined response of the system, com-ponent, or element considered. This goal is achieved by compliance with any one of the following criteria, or any alternative method that meets the intent stated above, provided that the intensity of loads or acceler-ations for each input are conservatively represented (approximately at the level of the 84th percentile, or the mean plus one standard deviation, of the expected input intensity).

1. Criterion.

Dynamic or transient responses of structures, components and equipment arising from combinations of dynamic loading or motions may be combined by SRSS provided that each of the dynamic inputs or responses has characteristics similar to these of earthquake ground motions, and that the individual component inputs can be considered to be relatively uncorrelated; i.e., the individual dynamic inputs or responses considered are either from independent events or have random peak phasing. This similarity involves a limited number of peaks of force or acceleration (not more than 5 exceeding 75 percent of the maximum, or not more than 10 exceeding 60 percent of the maximum), with approximately zero mean and a total duration of strong motion (i.e., exceeding 50 percent of the maximum) of 10 seconds or less.

Explanation.

i Since earthquake motions in various directions produce responses which are combined conservatively by the use of SRSS, the descriptions of ,

dynamic or transient inputs are based on those applicable to earthquake

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. motions. The coef ficient of correlation for these is less than 0.4, and the pattern of peaks is based on Table 2 of Circular 672 of the USGS describing earthquake ground motions for use in the design of the Alaska Oil Pipeline. The probability distribution for the, responses to earth-quake motions is based on the concepts underlying U. 5. NRC Regu'latory Guide 1.60, where the standard deviation is 30 to 40 percent of the median value.

It has been proved some decades ago that modal response.s to earthquake motions may be conservatively combined by SRSS methods with the same degree of conservatism as th5t of the motions. If each of such responses is considered to be at the level of mean plus one standard deviation,

. the SRSS value is also at this level. For the same reasons, responses from the three component directions of earthquake motions may'also be conservatively combined by SRSS methods.

2. Criterion.

When response time-histories are available for all multiple dynamic loadings being combined, SRSS methods may be used for peak combined response when CDF calculations, using appropriate assumptions on the range of possible time lags between the response time-histories, show the following criteria are met:

a. There is estimated to be less than approximately a 50%

conritional probability that the actual peak combined response from 2).ese conservatively defined loadings exceeds approxi-mately the SRSS calculated peak response, and

b. There is estimated to be less than approximately a 15% con- j ditional probability that the actual peak combined response exceeds approximately 1.2 times the SRSS calculated peak response.

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plACKFOXSTATIONSERVICELIST XC: L. Dow Davis, Esquire Joseph R. Farris, Esquire William D. Paton, Esquire John R. Woodard, III, Esquire Colleen Woodhear, Esquire Green, Feldman, Hall & Woodard Counsel for NRC Staff 816 Enterprise Building U. S. Nuclear Regulatory Commission Tulsa, Oklahoma 74103 Washington, D. C. 20555 Andrew T. Dalton, Esquire Mr. Cecil Thomas 1437 South Main Street, Suite 302 U. S. Nuclear Regulatory Commission Tulsa, Oklahoma 74119 Phillips Building 7920 Norfolk Avers.e Mrs. Ilene H. Younghein Bethesda, Maryland 20014 3900 Cashion Place Oklahoma City, Oklahoma 73112 Mr. Jan A. Norris Environmental Projects Branch 3 Mr. Lawrence Burrell U.S. Nuclear Regulatory Commission Route 1, Box 197 Phillips Building Fairview, Oklahoma 73737 7920 Norfolk Avenue Bethesda, Maryland 20014 Mrs. Carrie Dickerson Citizens Action for Safe Energy, Inc.

Mr. William G. Hubacek P. O. Box 924 U.S. Nuclear Regulatory Commission Claremore, Oklahoma 74107 Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 Mr. Gerald F. Diddle General Manager Associated Electric Cooperative, Inc.

P. O. Box 754 Springfield, Missouri 65801 Mr. Maynard Human General Manager Western Farmers Electric Cooperative P. O. Box 429 Anadarko, Oklahoma 73005 Michael I. Miller, Esq.

Isham, Lincoln & Beale One 1st National Plaza Suite 4200 Chicago, Illinois 60603 Mr. Joseph Gallo Isham, Lincoln & Beale 1050 17th Street N.W.

Washington, D. C. 20036

.