ML16341C156
| ML16341C156 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/18/1984 |
| From: | Schierling H Office of Nuclear Reactor Regulation |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML16341C157 | List: |
| References | |
| NUDOCS 8406060016 | |
| Download: ML16341C156 (14) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 MAY 1o ao4 Docket Nos.:
50-275 and 50-323 MEMORANDUM FOR:
George M. Knighton, Chief Licensing Branch No.
3 Division of Licensing FROM:
SUBJECT:
Hans Schierling, Proiect Manager Licensing Branch No.
3 Division of Licensing
SUMMARY
OF NRC MEETING WITH PG&E REGARDING REVALIDATION PROGRAM FOR SEISMIC DESIGN BASES A meeting was held on May 8, 1984 with PG&E regarding a program for revalidation of the Diablo Canyon seismic design bases.
Attachment 1 is a list of attendees.
Backoround In its letter of July 18, 1978 the ACRS stated:
"The Committee recommends that the seismic design of Diablo Canyon be reevaluated in about ten years taking into account applicable new information."
By letter of March 22, 1984 PG&E provided the Commission with a preprint of the paper "Post-Miocene'ompressional Tectonics Along the Central California Margin," J.
K. Crouch, S.
B. Bachman and J. T. Shay (the Crouch Paper).
This subiect was discussed at Commission meetings on March 26 and 27 and April 13, 1984 and is also included in the Comission Memorandum and Order CLI 84-5 o+
April 13, 1984.
In the Order, the Commission requested the ACRS to review the new information prior to any full-power decision and to comment on a draft license condition to be prepared by the staff which would reauire PG&E to reassess by l988 the seismic design basis for Diablo Canyon.
As a result, the requirement for such a program was made a condition to the low-power license in Amendment 9, dated April 18, 1984 as follows:
"PG&E shall develop and implement a State-of-the-Art Program to revalidate the seismic design bases for Diablo Canyon.
PG&E shall submit for NRC staff review and approval the proposed Program Plan and proposed schedule for implementation by January 30, 1985.
The program shall be completed and a final report be submitted to the NRC by July 1, 1988."
84060600i6 8405i8 PDR ADOCK 05000275 P
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I gl The Geosciences Branch, in a memorandum of Nay 7, 1984 from R. ilackson to G.
Knighton (Attachment 2), prepared a draft of specific elements to be included as a license condition for the PGSE program.
Included in the memorandum are also further clarifications and a description of staff parallel effort.
PGSE had been provided a draft copy of these elements prior to the meeting.
Discussion The staff described in further detail the specifc elements tha't should be included in the program (see Attachment 3 for staff view graphs).
PGSE provided comments as listed in Attachment 4.
The following specific points were made during the meeting:
PG&E will evaluate new geologic and seismic information developed since the 1979 ASLB Hearing, including proprietarv data.
It might also be necessary for PG8E to collect and self-develop new information, in addition to new information available from other sources.
PGSE should consider an instrumentation network configuration to determine locations and source mechanisms of local earthquakes.
The type of information was found very useful in resolving issues in recent licensing actions.
Different methodologies should be employed in the reevaluation of the controllina earthquake for the design basis.
Various panels of experts will assist the staff, in particular on potentially difficult issues such as earthquake groundmotion modeling.
The USGS will be advising the staff and will also be available to report to Commission.
The development of the program by PGSE and its implementation will be in an "interactive" mode with the staff.
A specific schedule for reports and meetings should not be decided on now but interactions should be frequently.
Further detail to be included in the program.
Regarding soil structure interactions it will be necessary to place the "TAU" effect in its proper perspective.
The staff is considering convening an expert panel on the subject.
A clear distinction should be made in the program regarding the "Hosgri Event" and the "Safe Shutdown Earthquake (SSE)"
The wording in the draft license condition in its distinction between "revalidation" and "reevaluation" is not clear.
Staff responded that, in general, "revalidation" refers to confirmation of current design
- basis, "reevaluation" refers to consideration of new data'and information which could have a potential for change.
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The requirement for a probabilistic risk assessment (PRA) study was discussed in detail.
The staff cited recent PRA studies such as for Limerick, Zion, Indian Point, Midland and Big Rock Point.
S. Israel (RRAB) provided information regarding acceptability, purpose and scope of a PRA.
He stated that while a seismic PRA would fulfillthe immediate need for a PRA on Diablo Canyon, a
more extensive study, not necessarily beyond core melt, including internally initiated events, such as LOCA or station blackout, would be more efficient because of commonality in systems aspects and maybe more cost effective in the long term.
PG&E stated that in this case they also would consider to include site, population and meteorology aspects.
A. K. Ibrahim, GSB, reported briefly on a recent PRA for the Kuosheng facility in Taiwan.
R. Jackson,
- GSB, stated that the staff uses PRA's as a screening tool to identify potential problems and not as a method to derive specific numbers for probability of failure.
In this sense it is used as a probabilistic insight in making deterministic decisions.
He referenced NUREG-CR-2300 (January 1983) and NUREG-1050 (Draft, February 1984) for PRA studies, including cost estimates.
R. Jackson also suggested that PG&E discuss the Diablo Canyon PRA study with NRR management prior to commencing the effort in order to obtain a better understanding of how the results of such a study might be utilized.
The format of the specific elements with respect to a license condition was discussed briefly.
At this time the staff proposes to include in the full-power license amendment the current license condition, as appropiately modified, from the low-power license (Attachment 9, April 18, 1984).
The specific elements, after review and endorsement by the ACRS, need not necessarily be included as such in the full-power license amendment but must be fully resolved'and documented in some other manner (e.g.
Commission memorandum or staff internal memorandum) and must be referenced in the license condition.
In any case, the specific elements must be clearly identified prior to full-power.
The next milestone is a meeting with the ACRS in Los Angeles on May P4, 1984.'.
Savin (ACRS) stated that S.
Crouch had been requested to attend the meeting.
At the conclusion of the meeting D. Brand (PG&E) stated that PG&E will discuss the scope of the PRA with utilities that recently performed such a study and may also wish to have additional discussion of this aspect with NRR management after the ACRS meeting.
- Overall, PG&E understands the revalidation program, the elements laid out by the staff and, in general, concurs in the concept of the approach for the program.
Attachments:
As stated (4) cc:
See next page CONCURRE DL:LB83 HSchierl>
.es 5/g/84 IX Hans Schierling, Project Manager Licensing Branch No.
3 Division of Licensing 8
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Mr. J. 0. Schuyler, Vice President Nuclear Power Generation c/o Nuclear Power Generation, Licensing Pacific Gas and Electric Company 77 Beale Street, Room 1435 San Francisco, California 94106 Philip A. Crane, Jr.,
Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, Cal ifornia 94120 Mr. Malcolm H.
Fur bush Vice President - General Counsel Pacific Gas
& Electric Companv Post Office Box 7442 San Francisco, California 94120 Janice E. Kerr, Esq.
California Public Utilities Commission 350 McAllister Street San Francisco, California 94102 t1r. Frederi ck Ei ss 1 er, Pres ident Scenic Shoreline Preservation Conference, Inc.
4623 More Mesa Drive Santa Barbara, California 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.
Seymou~
& Willis 601 California Street, Suite 2100 San Francisco, California 94108 Mr. Richard Hubbard MHB Technical Associates Suite K
1725 Hamilton Avenue San Jose, California 96125 Mr. John Marrs, Managing Editor San Luis Obis o Count Tele ram Tribune 3
1 o nson venue P. 0.
Box 112 San Luis Obispo, California 93406 Diablo Canyon Resident Inspector/Diablo Canyon NPS c/o US Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Ms.
Rave 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 Paul C. Valentine, Esq.
321 Lytton Avenue Palo Alto, Ca 1 iforni a 90064 Dr. William E. Cooper Project Manager - 5511 Teledyne Engineering Services 130 Second Avenue Waltham, Massachusetts 02254 Mr. Dick Blankenburg Editor
& Co-Publisher South County Publishing Company P. 0.
Box 460 Arroyo Grande, California 93420 Bruce Nor ton, Esq.
Norton, Burke, Berry
& French, P.C.
202 E. Osborn Road P.
O. 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
k Arthur C. Gehr, Esq.
Snell
& Wilmer 3100 Valley Center Phoenix, Arizona 85073 Mr. Lee M. Gustafson, Director Federal Agency Relations Pacific Gas
& Electric Company 1050 17th Street, N.W.
Suite 1180 Washington, DC 20036 Regional Administrator - Region V
US Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Dr. Jose Roesset 3506 Duval Road Austin, Texas 78759 Michael J. Strumwasser, Esa.
Special Council to the Attorney General State of California 3580 Wilshire Boulevard, Suite 800 Los Angeles, California 90010 Mr. Tom Harris Sacremanto Bee 21st and 0 Streets Sacramento, Cal ifornia 95814 Mr. H. Daniel Nix California Energy Commission 1516 9th Street, MS 18 Sacramento, California 95814 Maurice Axelrad, Esq.
Lowenstein,
- Newman, Reis and Axelrad 1025 Connecticut
- Avenue, NW Washington, DC 20036 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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