ML13302A790

Summary of 800724 Meeting W/Applicants to Discuss Analysis of Imperial Valley Earthquake of Oct 1979

ML13302A790
Person / Time
Site:	San Onofre
Issue date:	08/27/1980
From:	Rood H Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
TASK-03-06, TASK-3-6, TASK-RR NUDOCS 8009100417
Download: ML13302A790 (19)

Text

Fop MEETING

SUMMARY

DISTRIBUTION AUG 27 1980 Docket Filec J. Stolz NRC PDR S. Hanauer Local PDR P. Collins TIC D. Vassallo NSIC D. Ziemann Branch File R. Mattson H. Denton R. Schroeder E. Case K. Kniel D. Eisenhut D. Skovholt R. Purnle G. Kniqhton T. Novak M. Ernst S. Varga R. Baer T. Ippolito C. Berlinaer R. A. Clark S. Israel R. Reid ACRS (16)

R. Tedesco Attorney, nELD J. Youngblood OE (3)

A. Schwencer OS (7)

Chief, Licensing Branch #3 Project Manacer H. Rood J. R. Miller Licensing Assistant J. Lee G. Lainas Receotionist D. Crutchfield TERA Chief, Systemic Evaluation Program Branch J. LeDoux, IE Chief, Operating Reactors Assessment Branch D. Tondi R. Vollmer I&E Headouarters R. Bosnak I&E Region I F. Schauer I&E Region II R. E. Jackson I&E Region III G. Lear I&E Reaion IV V. Noonan I&E Region V S. Pawlicki V. Benaroya NRC Particioants:

Z. Rosztoczy S. Nowicki W. Haass R. Rothman D. Muller L. Reiter R. Ballard H. Rood W. Regan J. D. Saltzman D. Ross P. Check R. Satterfield

0. Parr bcc:

Aoplicant & Service List F. Rosa W. Butler W. Kreger R. W. Houston T. Murphy W. Gammill L. Rubenstein T. Soeis Chief, Core Performance Branch

~Oc~9fyJ671

AUG 2 7 1980 Docket Nos.:

50-206, 0-(361 and 50-362' APPLICANTS:

SOUTHERN CALIFORNIA EDISON_ COMPANY (SCE).

SAN DIEGO GAS AND ELECTRIC COMPANY (SDG&E)

FACILITY:

SAN ONOFRE NUCLEAR GENERATING STATJON, UNITS 1, 2 AND 3

SUMMARY

OF MEETING TO DISCUSS ANALYSIS OF IMPERIAL VALLEY EARTHQUAKE OF OCTOBER 1979 On July 24, 1980, members of the NRC.Staff met with thd applicants and their consultants in Rosemead, California to discuss the-.above subject.

Attendees at the meeting are given in Enclosure 1.

The meeting agenda is given in.

The applicants and their consultants presepted.a number, of sildes comparing the analytical predictions of the Imperial Valley earthquake, using a modelling technique developed on the San.Onofre Unit 1 docket, with the measured records obtained at various recording stations near the fault rupture. The model was originally tested against four earthquakes. These were:

1940 Imperial Valley, 1966 Parkfield,, l971T San Fernando, and-1933 Lonc Beach. When compared with the 1979 Imperial Valley earthquake, the "original" model prediction of horizontal acceleration was a little high.near the fault.

The vertical accelerations predicted by the "original" model were significantly lower than measured values at.high frequencies.. A comparison of calculated and measured peak horizontal and vertical acceleration as a functionof distance from the fault is shown in Enclosures. 3 and 4.

Following the comparison using the "original" model, the model was refined by the inclusion of randomness, as indicated in. Enclosure. 5. These refinements were based on theuretical-considerations as well.as the knowledge that the refinements would probably improve the prediction of the 1979.,

Imperial Valley earthquake.

As is shown In Encl osures 6 and 7,. the."refined" model is an improvement over the "original" Model, particularly, for, the vertical acceleration.

Following the model refinements, the "refi ned".. model -was used to predict the SSE for the San Onofre site.. A comparison of the "refined" model.

prediction with the design spectra for San Onofre 1, 2.and 3 are shown in Enclosures 8 and 9, for 5% damping..Conclusions reached by'the applicants from these studies are given in Enclosures..10 and 11..

OFFiCE SU RN A M E S

D A TE T-.**

1--9-2*.---

NRC FORM 318 (9-76) NRCM 0240.

• U.S.

GOVERNMENT PRINTING.OFFICE: 1979-289-369 AUG 2 ?H At the conclusion of the meeting, the applicants indicated that the studies discussed at the meeting would be submitted on the San Onofre dockets for staff review by August 8, 1980.

H. Rood, Project Manager Licensing Branch No. 3 Division of Licensing OFFNA E. H#3o D L j3...

SURNAME0 HRood:mec ASch Lncer OA T E

.A

.80...8/.

a.8/80....

.e................

NRC FORM 318 (9-76) NRCM 0240

• U.S.

GOVERNMENT PRINTING OFFICE: 1979-289-369

REGO UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 AUG 7

Docket Nos.:

50-206, 50-361 and 50-362 APPLICANTS:

SOUTHERN CALIFORNIA EDISON COMPANY (SCE)

SAN DIEGO GAS AND ELECTRIC COMPANY (SDG&E)

FACILITY:

SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 1, 2 AND 3

SUMMARY

OF MEETING TO DISCUSS ANALYSIS OF IMPERIAL VALLEY EARTHQUAKE OF OCTOBER 1979 On July 24, 1980, members of the NRC Staff met with the applicants and their consultants in Rosemead, California to discuss the above subject. Attendees at the meeting are given in Enclosure 1. The meeting agenda is given in.

The applicants and their consultants presented a number of slides comparing the analytical predictions of the Imperial Valley earthquake, using a modelling technique developed on the San Onofre Unit 1 docket, with the measured records obtained at various recording stations near the fault rupture. The model was originally tested against four earthquakes. These were:

1940 Imperial Valley, 1966 Parkfield, 1971 San Fernando, and 1933 Long Beach. When compared with the 1979 Imperial Valley earthquake, the "original" model prediction of horizontal acceleration was a little high near the fault.

The vertical accelerations predicted by the "original" model were significantly lower than measured values at high frequencies. A comparison of calculated and measured peak horizontal and vertical acceleration as a function of distance from the fault is shown in Enclosures 3 and 4.

Following the comparison using the "original" model, the model was refined by the inclusion of randomness, as indicated in Enclosure 5. These refinements were based on theoretical considerations as well as the knowledge that the refinements would probably improve the prediction of the 1979 Imperial Valley earthquake. As is shown in Enclosures 6 and 7, the "refined" model is an improvement over the "original" model, particularly for the vertical acceleration.

Following the model refinements, the "refined" model was used to predict the SSE for the San Onofre site. A comparison of the "refined" model prediction with the design spectra for San Onofre 1, 2 and 3 are shown in Enclosures 8 and 9, for 5% damping. Conclusions reached by the applicants from these studies are given in Enclosures 10 and 11.

AMU2 7 193RQ, At the conclusion of the meeting, the applicants indicated that the studies discussed at the meeting would be submitted on the San Onofre dockets for staff review by August 8, 1980.

H. Rood, Project Manager Licensing Branch No. 3 Division of Licensing

Mr. Robert Dietch Vice President Southern California Edison Company 2244 Walnut Grove Avenue P. 0. Sox 800 Rosemead, California 91770 krB. W. Gilman Senior Vice President - Cperations San Diego Gas & Electric Company 101 Asn Street P. 0. Box 1831 San Diego, California 92112 cc:

Charles R. Kocher, Esq.

james A. zeoletto, Esq.

Southern California Edison Company 2244 Walnut Grove Avenue P. O. Box 800 Rosemead, California 91770 Chickering & Gregory ATTN:

David R. Pigott, Esq.

Counsel for San Diego Gas & Electric Company &

Southern California Edison Company 3 Embarcadero Center - 23rd Floor San Francisco, California 94112 Mr. George Caravalho City Manager City of San Clemente 100 Avenido Presidio San Clemente, California 92672 Alan R. Watts, Esq.

Rourke & Woodruff Suite 1020 1055 North Main Street Santa Ana, California 92701 Lawrence Q. Garcia, Esq.

California Public Utilities Commission 5066 State Building San Francisco, California 94102 Mr. V. C. Hall Combustion Engineering, Incorporated 1000 Prospect Hill Road Windsor, Connecticut 06095

Mr. Robert Dietch 2

Mr. B. W. Gilman cc:

Mr. P. Dragolovich Bechtel Power Corporation P. 0. Box 60860, Terminal Annex Los Angeles, California 90060 Mr. Mark Medford Scuthern California Edison Ccmpany 2244 Walnut Grove Avenue P. 0. Box 800 Rosemead, California 91770 Henry Peters San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Ms. Lyn Harris Hicks Advocate for GUARD 3908 Calle Ariana San Clemente, California 92672 Richard J. Wharton, Esq.

Wharton & Pogalies Suite 106 2667 Camino Del Rio South San Diego, California 92108 Phyllis A. Gallagher, Esq.

Suite 222 1695 West Crescent Avenue Anaheim, California 92701 Mr. A. S. Carstens 2071 Caminito Circulo Norte Mt. La Jolla, California 92037 Resident inspector, San Onofre/NPS c/o U. S. Nuclear Regulatory Commission P. 0. Box AA Oceanside, California 92054

ENCLOSURE 1 7/24/80 MEETING SAN ONOFRE UNITS 1, 2 AND 3 NAME ORGANIZATION M. 0. Medford SCE W. C. Moody SCE J. L. Rainsberry SCE S. J. Nowicki NRC-PM #1 R. L. Rothman NRC-GSB Leon Reiter NRC-GSB H. Rood NRC-LB3 A. Jurkevics TERA-DELTA R. Hubbard MHB TECH ASSOC H. Peters SDG&E R. C. Riaschke SCE Pual Koss BECHTEL John Barneich WOODWARD CLYDE Robert L. McNeill CONSULTANT David R. Pigott SCE & SDG&E James A. Beoletto SCE K. P. Baskin SCE David Barron SCE J. L. McNey SCE P. J. West SCE Fank W. Brady PG&E

-2 NAME ORGANIZATION Mike Williams Pacific Gas & Electric G. Barlow Friends of the Earth Chuck Real Calif. Division of Mines

& Geology Gary Frazier TERA-DELTA

ENCLOSURE 2 EARTHQUAKE MODELING STUDIES July 24, 1980 INTRODUCTION AND OVERVIEW I.

BACKGROUND A.

Modeling Procedure B.

Calibration and Validation Studies C. Site Specific Predictions II.

RECENT EARTHQUAKE DATA A. Recent Earthquakes B.

Ground Motion Data C. Relevance of Imperial Valley Earthquake III.

WAVE PROPAGATION IN THE IMPERIAL VALLEY A. Earth Structure B. Propagation Effects IV.

MODELING RESULTS A. Earthquake Characterization B. Computed Results C. Conclusions V.

MODEL REFINEMENTS A.

Rake and Dip Randomness B. Rupture Incoherence C. Computed Results D.

Parameter Studies E. Conclusions VI.

IMPLICATIONS FOR SAN ONOFRE

ENCLOSURE 3 O - OUGERAt. MODBL C:)

IMPERIAL VALLEY EARTHQUAKE PEAK HORIZONTAL ACCELERATIONS, CORRECTED L

JO 01 A~

-0 1

R 1%

AN regressed curve A L (R+20)

I I

I I

l l it1 I

I I

i t

i l l i

1.

10.

100.

OISTANCE KM IV-2

ENCLOSURE 4 A-0~

• -O(LtIr&gL moDEL.

IMPERIAL VALLEY EARTHQUAKE PEAK VERTICAL ACCELERATIONS, CORRECTED J

AA IR L)

NN LLCD I

a regressed curve A

1 75 (R+I10) 1 0.

10 0.

OISTRNCE KM IV-3 1

1

ENCLOSURE 5 MODEL REFINEMENTS

1. RAKE AND DIP RANDOMNESS RAKE = Gross Rake + 200 of randomness DIP = Gross Dip + 100 of randomness

2.

RUPTURE IRREGULARITIES 50 Meter irregularities in rupture LV 121 WIT 7'

1V1

ENCLOSURE 6

~FT C:

IMPERIAL VALLEY EARTHQUAKE PEAK HORIZONTAL ACCELERATIONS, CORRECTED A

R A

RR AA A

-o'

~

NN LLC N

R L

1 CD1 regressed curve A

1 (R+20) 1.75 1,

10.

100.

DISTRNCE KM IV-2

ENCLOSURE 7 SA - 95 tHEZ MODEL CD CD IMPERIAL VALLEY EARTHQUAKE PEAK VERTICAL ACCELERATIONS, CORRECTED 1

RR AA

-JI1 LD 1

CC gR

\\

\\IL CD o

regressed curve A

1 1.7 (R+101 110.

100 OISTRNCE KM

-IV-3 IV-3

ENCLOSURE 8 E

'0 '. HRND-20X20-TRPS/P, TSDTRP=0.25, GMRMAT=0 1IaI

o SITE SEDAMP

=

-0.5:

MODEL

MERN, MERN*SIGMR

-.67G HOUSNER UNITS 2 RNO 3 DBE

10. D.l iL)

IIf

0.

1. D PE/K

/ERN ACC IGr)

0. 372

\\IEL ICM/S) 34.3 DISP ICM) 22.0 ML 6.20 D. 1 1

1 1

1 I

1 1 I l l l 1 1 1 a l I I I

0. 01

0. 10

1. 00 i0.0OO PERI OD (S EC)

VI-5

ENCLOSURE 9 EQ

'0 ',

RAND-20X20-THPS/P, TSOTRP=0.25.

GMMATW=0 1 DDD.P n tiil i

SITE VERT DWMP = 0.05 MOOEL MEAN.

MERN45IGHR

.44G HOUSNER UNIIS 2 AND 3 OBE 100.0/

1 D. D J

/

L

/

L.

PER HERN COMPUTED A CC IG) 0.178 VEL ICH/S) 11.8 DISP ICM) 4.18 HL 5.66 0.01 1

0. 10 1.00 10.00 PERIOD (SEC)

VI 4

ENCLOSURE 10 IMPLICATIONS POR SAN ONOFRE SAN ONOFRE UNIT 1 o

San Onofre Site Specific Spectra with Imnerial Valley Refinements Exceed To a Limited Extent the San Onofre Unit 1 Seismic Reevaluation Spectra.

SAN ONOFRE UNITS 2 & 3 o

San Onofre Site Specific Spectra with Imperial

'Valley Refinements Remains Below San Onofre Units 2 and 3 DBE VI-13

ENCLOSURE 11 COMPARISON OF SAN ONOFRE SITE SPECIFIC SPECTRA INCLUDING IMPERIAL VALLEY REFINEMENTS WITH SAN ONOFRE UNIT 1 SEISMIC REEVALUATION SPECTRA o

Reevaluation Spectra is conservative at structural periods of Containment and Reactor Building o

Time history utilized for reanalysis of the Reactor Coolant System generally envelopes San Onofre Site Specific Spectra with Imperial Valley refinements o

Components analyzed to date have or were modified to have a minimum of 10% margin above allowable stresses o

Observed performance of structures and equipment during actual earthquakes clearly indicates substantial reserve capacity beyond the limits of allowable stresses VI-20