ML16341D597
| ML16341D597 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 01/27/1986 |
| From: | Schierling H Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8602180201 | |
| Download: ML16341D597 (62) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 January 27, 1986 Docket Nos.:
50-275 and 50-323 LICENSEE: Pacific Gas and Electric Company FACILITY: Diablo Canyon Nuclear Power Plant
SUBJECT:
MEETING
SUMMARY
LONG TERM SEISMIC PROGRAM MEETING llITH NRC CONSULTANTS FOR THEORETICAL STRONG GROUND MOTION MODELING On DeceIIjber 12, 1985 the NRC staff met with its consultants for the theoretical strong ground motion modeling aspects of the licensee's (PGSE) long term seismic program (LTSP) for the reevaluation of the seismic design bases for the Diablo Canyon Nuclear Power Plant (Meeting Notice - Enclosure 1).
The attendees are listed in Table 1 (Enclosure 1).
The consultants are:
Dr. Keiiti Aki, University of Sourthern California Dr. Ralph J. Archuleta, University of California Santa Barbara Dr. Stephen M. Day, S-Cubed.
Administrative direction for the consultants is provided by Lawrence Livermore National Laboratory (LLNL).
The LLNL program manager is Dr. Jean Savy.
This was the first meeting between the NRC staff and the ground motion modeling consultants.
The staff summarized the licensing history of the Diablo Canyon Plant, in particular with respect to the LTSP license condition in the Unit 1 full power license.
The staff explained the interaction between staff and the consultants and emphasized that their views are being solicited as individuals, they not as a panel.
Each consultant will be provided, either through LLNL or directly from the
- NRC, with all pertinent information.
Each consultants should provide the staff through LLNL with independent comments as appropriate.
After the meeting of the NRC staff with the consultants PGSE representatives joined the meeting.
Participants are listed in Table 2 (Enclosure I).
PG8E presented a brief overview of the LTSP and a detailed presentation of the ground motion modeling program.
Viewgraphs are provided in Enclosure 2.
The PG&E engineering analysis needs a suite of time histories with appropriate wave composition and orientation of incoming waves, a
frequency range of 2-20 Hz, a realistic time duration, variation of frequency with time, phasing between horizontal and vertical components, and coherency of motion as a function of frequency.
PGSE plans to obtain this information from empirical ground motion studies incorporating the most recent data and site effects and from numerical modeling methods.
The staff commented that the approved program plan identifies two approaches, namely an empirical study and a theoretical numerical modeling study.
PGSE indicated that the numerical method will be used primarily as a
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January 27, 1986 sensitivity study on the ground motion.
This appears to be a change from the method described in the LTSP plan.
The staff stated it has found it advantageous in previous reviews to have independent numerical and empirical studies.
The NRC consultant commented that the numerical modeling studies should be benchmarked with empirical data and then extended to Diablo Canyon site specific conditions.
The time histories would have to be obtained from numerical modeling since they have to take into account rupture dynamics and site specific wave propagation.
Empirical studies do not give the details which PG&E stated are needed for the engineering analysis.
PG&E stated that they do not know when the results of a numerical modeling study would be available.
Input for the engineering analysis is needed in the near future.
PG&E stated that the empirical methodology can be improved or it can be bounded; numerical methods have a function but the specifics have not been defined.
PG&E will make a decision on this issue in the near future.
NRC consultants expressed a desire to visit the plant site.
The staff recommended that at such a visit PG&E should make a detailed presentation on thei.r planned numerical modeling study and that the NRC consultants on the soil structure interaction aspect should also participate at the visit.
No scheudle was set.
The staff stated that pertinent documents will be provided to the consultants for their familiarization with previously performed ground motion analyses.
A copy of the LTSP plan (PG&E letter DCL 85-033, January 30, 1985) had been provided earlier.
/s/HSchierling
Enclosures:
As stated Hans Schierling, Senior Project Manager PWR Project Directorate No.
3 Division of PWR Licensing-A cc w/enclosures:
See next page, PAD-3 HSchierl ng;pws 01/5f/86
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Pacific Gas and Electric Company Diab1 o Canyon CC:
Philip A. Crane, Jr.,
Esq.
Pacific Gas 5 Electric Company Post Office Box 7442 San Francisco, California 94120 Mr. Malcolm H. Furbush Vice President - General Counsel Pacific Gas E Electric Company Post Office Box 7442 San Francisco, California 94120 Janice E. Kerr, Esq.
California Public Utilities Commission 350 McAllister Street San Francisco, California 94102 Mr. Frederick Eissler, President Scenic Shoreline Preservation Con'ference, Inc.
4623 More Mesa Drive Santa
- Barbara, Cal ifornia 93105 Ms. Elizabeth Apfelberg 1415 Cozadero San Luis Obispo, California 93401 Mr. Gordon A. Silver Ms. Sandra A. Silver 1760 Alisal Street San Luis Obispo, California 93401 Harry M. Willis, Esq.
Seymour 8 Willis 601 California Street, Suite 2100 San Francisco, California 94108 Mr. Richard Hubbard MHB Technical Associates Suite K
1725 Hamilton Avenue San Jose, California 95125 Mr. John Marrs, Managing Editor San Luis Obis o Count Tele ram Tribune o nson venue P. 0.
Box 112 San Luis Obispo, California 93406 Resident Inspector/Diablo Canyon NPS c/o US Nuclear Regulatory Commission P.
0.
Box 369 Avila Beach, California 93424 Ms.
Raye. Fleming 1920 Mattie Road Shell Beach, California 93440 Joel
- Reynolds, Esq.
John R. Phillips, Esq.
Center for Law in the Public Interest 10951 West Pico Boulevard Third Floor Los Angeles, California 90064 Mr. Dick Blankenburg Editor 8 Co-Publisher South County Publishing Company P. 0.
Box 460 Arroyo Grande, California 93420 Bruce Norton, Esq.
Norton, Burke, Berry 5 French, P.C.
202 E. Osborn Road P. 0.
Box 10569
- Phoenix, Arizona 85064 Mr.
W.
C. Gangloff Westinghouse Electric Corporation P. 0.
Box 355 Pittsburgh, Pennsylvania 15230 David F. Fleischaker, Esq.
P. 0.
Box 1178 Oklahoma City, Oklahoma 73101
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Pacific Gas
& Electric Company Diablo Canyon CC:
Arthur C. Gehr, Esq.
Snell
& Wilmer 3100 Valley Center Phoenix, Arizona 85073 Mr. Leland M. Gustafson, Manager Federal Relations Pacific Gas
& Electric Company 1726 M Street, N.W.
Suite 1100 Washington, DC 20036-4502 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Michael J. Strumwasser, Esq.
Special Counsel to the Attorney General State of California 3580 Wilshire Boulevard, Suite 800 Los Angeles, Cal ifornia 90010 Mr. Tom Harris Sacramento Bee 21st and 0 Streets Sacramento, California 95814 Mr. H. Daniel Nix California Energy Commission 1516 9th Street, MS 18 Sacramento, California 95814 Lewis Shollenberger, Esq.
US Nuclear Regulatory Commission Region V
1450 Maria Lane Suite 210 Walnut Creek, California 94596 Mr. Thomas Devine Government Accountability Project Institute for Policy Studies 1901 Que Street, NW Washington, DC 20009
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.0 Pacific Gas II Electric Company Diablo Canyon CC:
Chairman San Luis Obispo County Board of Supervisors Room 220 County Courthouse Annex San Luis Obispo, California 93401 Director Energy Facilities Siting Division Energy Resources Conservation and Development Commission 1516 9th Street Sacramento, Cali fornia 95814 President California Public Utilities Comnission California State Building 350 McAllester Street San Francisco, Cali fornia 94102 Mr. Joseph 0.
Ward, Chief Radiological Heal th Branch State Department of Health Services 714 P Street, Office Building ¹8 Sacramento, California 95814
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ENCLOSURE 1
TABLE I - LIST OF ATTENDEES DIABLO CANYON GROUND MOTION MODELLING MEETING BETWEEN NRC STAFF AND NRC ADVISORY PANEL K. Aki R. Archuleta S.
Day G. Giese-Koch L. Reiter R.
Rothman J.
Savy H. Schierling NRC Panel Member NRC Panel Member NRC Panel Member NRC NRC NRC LLNL NRC
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TABLE 2 - LIST OF ATTENDEES DIABLO CANYON GROUND MOTION MODELLING MEETING BETWEEN NRC STAFF, NRC ADVISORY PANEL, PG8E AND PGAE CONSULTANTS K. Aki R. Archuleta S.
Day G. Giese-Koch L. Reiter R.
Rothman J.
Savy H. Schierling F.
W. Brady D. A. Brand L. S. Cluff G. Frazier B.
Lew B. Norton D.
Ogden B. Sarkar G. Sarkisian W. Savage H.
Seed P. Somerville W. White NRC Panel Member NRC Panel Member NRC Panel Member NRC NRC NRC LLNL NRC PG8E PGSE PGSE SAIC PG8 E Norton, Burke, Berry 8 French PG&E PGSE PGSE Woodward - Clyde PG8E Consultant Woodward - Clyde PGSE
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ENCLOSURE 2
Ground Motion Panel Meeting December 12, 1985 Agenda I
Background
1.
License Conditions 2.
Seismic Geology 3.
Other Hypotheses 4.
Safety Evaluation Earthquake II Engineering User Perspective 1.
How ground motion input will be util1zed in structural engineering analysis.
III Ground Motion Program 1.
Empirical Ground Motion Models 2.
Incorporate Recent Data 3.
Wave Propagation and Site Effects 4.
Numerical Methods IV Task Descriptions V
Schedule
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PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON LONG TERM SEISMIC PROGRAM EVALUATION OF FOUNDATION-STRUCTURE INTERACTION EFFECTS FREE-F I ELD GROUND MOTION FOUNDATION-STRUCTURE INTERACTION STRUCTURE BASE NOT ION
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INPUT FOR SOIL-STRUCTURE INTERACTION 0
SUITE OF REALISTIC TIME HISTORIES' RAVE COMPOSITION OF TIME HISTORIES (SY+P s Rs ETC s )
AND OR I ENTATION OF INCOMING WAVES'
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FREE-FIELD INPUT %TION l
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INP T %TIO NVIRO N NT:
0 SPECTRAL ANPLITUDES OF FREE-FIELD GROUND MOTIONS 0
INCIDENCE NAVE TYPES r COMPOS ITIONS i AND ANGLES 0
SPATIAL COHERENCY
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FOUNDATION INPUT NOTION l
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6E(RETRY OF FOUNDATIONS 0
FLEXIBILITYOF FOUNDATION NATS 0
EMBEDMENT EFFECTS 0
FOUNDATION SHEAR NAVE VELOCITIES 0
MULTIPLE FOUNDATION EFFECTS
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Depth-ft l5 30 50 vg fps 3600 5600 Transmit ting Boundary370'600 5600
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7 ANALYTICALMODEL FROM SEED AttD LYSMER'S REPORT, "ANALYSES OF SOIL-STRUCTURE INTERACTION EFFECTS DURING EARTHQUAKES FOR THE DIABLO CANYON NUCLEAR POWER STATION,"
1978.
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DONINA."1T FREQUENCY OF STRUCTUPES A."lD CONPONENTS ITEN FREQUE,'tCY (CPS)
CONTAINMENT SHEEL CONTAINMENT INTERIOR AUXILIARYBUILDING INTAKE STRUCTURE OUTDOOR TANKS RCL PRIMARY EQUIPMENT PIPING TURBINE BUILDING CONCRETE DIAPHRAGMS HALLS STEEL SUPERSTRUCTURES 10 13 15
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6 3-20 6
13 2
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UNITS f ANO 2 DIASLO CANYON SITE
'IMEHISTORY HOSQRI 7$ M/NEWARK
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IMPORTNT CHARACTERISTICS OF TINE HISTORIES 0
FREQUENCY RANGE OF INTERESTS 2 20 HZ 0
DURATION 0
VARIATION IN FREQUENCY CONTENT AND INTENSITY WITH TIHEo 0
PHASING BETWEEN HORIZONTAL AND VERTICAL C(EXPONENTS OF THE EARTHQUAKES' COHERENT/INCOHERENT COMPOS ITION OF NOTION AS h FUNCTION OF FREQUENCY ~
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]6 TItK IH SECONOS
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1
License Conditions 1.
Identify, examine, and evaluate all relevant geologic and seismic data since 1979; 2.
Reevaluate magnitude of seismic basis earthquake; 3.
Reevaluate ground motion at the site; 4.
Assess significance of Elements 1, 2, and 3.
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Ground Motion Considerations 1.
Empirical Ground Motion Models 2.
Incorporate Recent Data 3.
Mave Propagation and Site Effects 4.
Numerical Methods
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Task 1 - Attenuation Relationships For Peak Ground Acceleration 1.1 Select Appropriate Horizontal and Vertical Ground Motion Relationships for Rock Site; 1.2 Improve or Test Attenuation Relationships with Recent Earthquake Data;
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Task 2 - Assessment of Response Spectral Shape 2.1 Select Appropriate Horizontal and Vertical-Response Spectral Shapes for Rock Site; 2.2 Improve or Test Spectra Shape with Recent Earthquake Data; 2.3 Develop Appropriate Time Histories.
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Task 3 - Assess Site - Specific Ground Motion Characteristics 3.1 Assess wave propagation characteristics of site.
3.2 Evaluate Recorded Site Motions.
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Task 4 - Numerical Methods 4.1 Investigate asperity/barrier model using hybrid empirical/
analytical methods; 4.2 Assess effects of depth of rupture on ground motions; 4.3 Assess effects of source geometry and dynamics for near-site sources (directivity, strike slip vs.
dip slip).
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MEETING
SUMMARY
DISTRIBUTION 0
I Docket o
entral file Local PDR PAD83 RDG J. Partlow (Emergency Preparedness only)
Steve Varga H. Schierling OELD E. Jordan B. Grimes ACRS (10)
Plant Service List C. Parrish S.
Brocoum P.
T.
Kuo R. Ballard F.
Congel C.
Ong J.
McKinley NRC Partici ants K. Aki R. Archuleta S.
Day G. Giese-Koch L. Reiter R.
Rothman J.
Savy
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