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- j WASHINGTON, D. C. 20555 NOV 1 E W MEMORANDUM FOR: Mark Williams, Chief Technical Assistance Program Management Group Division of Licensing FROM:
George Lear, Chief Structural and Geotechnical Engineering Branch Division of Engineering
SUBJECT:
FRC MASONRY WALL REVIEW, CONTRACT NO. NRC-03-81-130, FINAL ASSIGNMENT 6, ADDITION OF DIABLO CANYON REVIEW We request that the task of reviewing the justification for the use of the energy-balance technique to qualify the masonry walls at Diablo Canyon plants be added to assignment 6 of referenced contract. The scope of the review, estimated staff hours and tentative schedules are indicated in the enclosure.
Some of the estimated manhours for this task can come from unused hours for assigned tasks which have been completed.
The FRC and its consultants have participated in a preview meeting with the licensee to discuss the overall concept of the licensee's justification and, therefore, are very familiar with the scope of the review. The enclosed scope and staff hours have been discussed with Dr. Vu Con of FRC.
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/' g MW George ear, Chief Structural & Geotechnical Engineering Branch Division of Engineering
Enclosure:
As Stated cc:
J. Knight R. Bosnak M. Carrington C. Trarmoll H. Schierling N. Chokshi
Contact:
N. Chokshi, X28967 d
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ENCLOSURE DIABLO CANYON - ENERGY - BALANCE TECHNIQUE REVIEW ESTIMATED DATE ACTIVITY ESTIMATED STAFF HOURS 1.
In near future Submittal of a draft report by the licensee 2.
2 weeks after the Review of the draft 40(16)*
receipt of the draft report and preparation report of comments (1 to 2 pages) 3.
4 to 5 weeks after the Review of the final report 80(24)*
submittal of the final and preparation of a technical report evaluation report
- Consultant hours.
Estimated Travel - One trip to either Bethesda or San Francisco, One FRC reviewer and one consultant, 2 to 4 days.
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UNITED STATES 8
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NUCLEAR REGULATORY COMMISSION E
WASHINGTON, D. C. 20555
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NOV 181985 Docket Nos.: 50-275 and 50-323 LICENSEE: Pacific Gas and Electric Company FACILITY: Diablo Canyon Nuclear Power Plant Units 1 and 2
SUBJECT:
MEETING
SUMMARY
- MASONRY WALLS On November 5,1985 members of the NRC staff and its consultants from the Franklin Research Center and Drexel University met with representatives from Pacific Gas and Electric Company (PG&E, the licensee) and Bechtel to discuss the PG&E approach to justify the use of the energy-balance technique to qualify some of the masonry walls at Diablo Canyon Units 1 and 2.
A list of attendees is provided in Enclosure I.
(The Diablo Canyon Unit 1 and Unit 2 licenses each contain a license condition regarding the matter).
The licensee outlined its approach of using San Onofre test data to demonstrate the convervatism of the energy-balance technique as applied to Diablo Canyon Units 1 and 2.
The approach consists of predicting the response values for the San Onofre test panels by using the energy-balance technique and correlating them with measured test results. The licensee also made available at the meeting a draft report for examination by the staff and its consultants during the meeting. Both the draft report and the PG8E presentation contained
-proprietary information. Based on its cursory audit of the PGAE draft report and on the information provided in the PG&E presentation, the staff found the PG&E approach to be promising. However, the staff indicated a need for a more thorough review of the draft report in order to provide further i
comments to be addressed in the final report. The licensee was requested to submit the draft report for staff review, including both proprietary and non-proprietary versions. PG&E comitted to submit the draft report in the near future. Based on the licensee's presentation, the staff requested that additional information as listed in Enclosure 2 be included in the final report.
The staff stated that additional coments or need for additional infonnation, if any, will be identified at the completion of its review of l
the draft report in about one month.
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Hans Schierling, ProjecY Manager Licensing Branch No. 3 Division of Licensing
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Enclosures:
as stated cc: See next page 1
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Mr. J. D. Shiffer Pacific Gas and Electric Company Diablo Canyon cc:
Philip A. Crane, Jr., Esq.
Resident Inspector /Diablo Canyon NPS Pacific Gas & Electric Company c/o US Nuclear Regulatory Commission Post Office Box 7442 P. O. Box 369 San Francisco, California 94120 Avila Beach, California 93424 Mr. Malcolm H. Furbush Ms. Raye Fleming Vice President - General Counsel 1920 Mattie Road Pacific Gas & Electric Company Shell Beach, California 93440 Post Office Box 7442 San Francisco, California 94120 Joel Reynolds, Esq.
John R. Phillips, Esq.
Janice E. Kerr, Esq.
Center for Law in the Public Interest California Public Utilities Commission 10951 West Pico Boulevard 350 McAllister Street Third Floor San Francisco, California 94102 Los Angeles, California 90064 Mr. Frederick Eissler, President Mr. Dick Blankenburg Scenic Shoreline Freservation Editor & Co-Publisher Conference, Inc.
South County Publishing Company 4623 More Mesa Drive P. O. Box 460 Santa Barbara, California 93105 Arroyo Grande, California 93420 Ms. Elizabeth Apfelberg Bruce Norton, Esq.
1415 Cozadero Norton, Burke, Berry & French, P.C.
San Luis Obispo, California 93401 202 E. Osborn Road P. O. Box 10569 Mr. Gordon A. Silver Phoenix, Arizona 85064 Ms. Sandra A. Silver 1760 Alisal Street Mr. W. C. Gangloff San Luis Obispo, California 93401 Westinghouse Electric Corporation P. O. Box 355 Harry M. Willis, Eso.
Pittsburgh, Pennsylvania 15230 Seymour & Willis 601 California Street, Suite 2100 David F. Fleischaker, Esq.
San Francisco, California 94108 P. O. Box 1178 Oklahoma City, Oklahoma 73101 Mr. Richard.Hubbard MHB Technical Associates Suite K i
1725 Hamilton Avenue San Jose, California 95125 Mr. John Marrs, Managing Editor San Luis Obispo County Telegram Tribune 1321 Johnson Avenue P. O. Box 112 San Luis Obispo, California 93406
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't Pacific Gas & Electric Company Diablo Canyon ec:
Arthur C. Gehr, Esq.
Mr. Thomas Devine
-Snell & Wilmer Government Accountability 3100 Valley Center Project Phoenix, Arizona 85073 Institute for Policy Studies 1901 Que Street, NW Mr. Leland M. Gustafson, Manager Washington, DC 20009 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, California 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 Sho11enberger, Esq.
US Nuclear Regulatory Commission Regign V 1450 Maria Lane Suite 210 Walnut Creek, California 94596
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l LIST OF ATTENDEES NAME AFFILIATION H. Schierling NRC/DL P. T. Kuo NRC/DE N. C. Chokshi NRC/DE V. Con Franklin Research Center A. Hamid Drexel University J. McCall PG&E S. Bhattacherya PG&E C. Coffer PG&E T. W. Libbs PG&E W. White Bechtel W. Tseng Bechtel 1
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1 NRC REQUEST FOR ADDITIONAL INFORMATION 1.
Provide additional data for hysterisis loops (i.e., a few more " snap shots" of hysterisis loop for the pin-pin condition) 2.
Discuss the correlation and conservatism in the energy-balance approach in the light of differences Nithe assumed hysterisis loop in the analytical approach and the test data.
3.
Consider bottom hinge effects in the correlation study by calculating the maximum rebar ductility for the bottom hinge.
4.
Provide, quantitative arguments to substantiate the similarity between SONGS-1 and Diablo Canyon walls.
5.
Discuss the applicability of the plate action in the energy-balance technique.
6.
Provide the clarification for five walls where Em=1000fc' was used (higher modulus based on the grout strength).
7.
Discuss the shear transfer capacity for the walls where clip angles do not extend to the block but may extend to the dry pack.
3, 8.
Provide qualitative discussion on margins of the masonry walls.
9.
Calculate the yield displacement from the SONGS tests and correlate against energy-balance technique prediction.
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- 10. Provide a list of the displacement ductilities for the Diablo Canyon
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walls to demonstrate that they are less than 3.0.
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