ML20209D135
| ML20209D135 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Diablo Canyon |
| Issue date: | 07/13/1984 |
| From: | Knight J Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML082410749 | List:
|
| References | |
| FOIA-86-197 NUDOCS 8407190084 | |
| Download: ML20209D135 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION WASHWGTON, D. C. 20556 e,
j ggg MEMORANDUM FOR: Thomas M. Novak, Assistant Director for Licensing Division of Licensing FROM:
James P. Knight, Assistant Directo'r for Components & Struc'tures Engineering Division of Engineering
SUBJECT:
REVISION OF THE DIAELO CANYON LICENSE CONDITION TO REEVALUATE THE SEISMIC DESIGN BASIS OF DIABLO CANYON On March 27, 1984, the-Comission instructed the staff to meet with PG&E and ACRS to discuss the specific elements of the license condition to reevaiuate the seismic design basis of Diablo Canyon. The Staff met-with PG&E on May 8, 1984, the ACR3 Subcommittee on Extreme External Pheneomena and Diablo Canyon on May 24, and the ACRS Full Comittee on June 14.
Based on these discussions the staff suggests that the license condition approved by the Comission as Amendment No. 9 of the Low Power License be revised as shown on the attachment.
The attached revision incorporates suggestions the staff received during our discussions and briefly sumarizes each of the four specific elements.
/
JamelsP.Kight Assistant Director for
[ fomponents & tructures Engineering ufvision of Engineering
Attachment:
As stated cc: See next page i
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JUL 13 584 l
cc: w/ attachment R. Vollmer J. Knight S. Brocoum L. Reiter R. Rothman R. McMullen D. Gupta H. Polk G. Lear P. T. Kuo L. Chandler H. Scherling A. Thadani 4
G. Knighton C. Ong A. Kenneke 5
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Diablo Canyon Nuclear Plant License Condit.'on PG&E shall develop and implement a program to reevaluate the seismic design basis used for Diablo Canyon.
I The program shall include the following proposed elements:
(1) PG&E shall identify, examine, and evaluate all relevant geologic and seismic data, information, and interpretations that have become available since the 1979 ASLB hearing in order to update the j
geology, seismology and tectonics in the region of the Diablo Canyon Plant.
If needed to define the earthquake potential of the l
region as it. effects the Diablo Canyon Plant, PG&E will also reevaluate the earlier-information and acquire additional new data, i
(2) PG&E shall reevaluate the magnitude of the-earthquake used to j
determine the seismic basis of the Diablo Canyon Nuclear Plant using the information from Element 1.
(3) PG&E shall reevaluate the ground motion at the site based on the
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results obtained from Element 2 with full consideration of site and i
other relevant effects.
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t (4).PG&E shall assess the significance of conclusions drawn from the deterministic seismic reevaluation studies in Elements 1, 2 and 3, utilizing a probabilistic risk analysis and deterministic studies.
as necessary, to assure adequacy of seismic margins.
PG&E shall submit for NRC staff review and approval a proposed program plan and proposed schedule for implementation by January 30, 1985. The program shall be completed and a final report submitted to the NRC three years following the approval of the program by the NRC staff.
PGSE shall keep the staff informed on the progress of the reevaluation program as necessary, but as a minimum will submit Quarterly progress reports and arrange for semi-annual meetings with the staff. PG&E will also keep the ACRS informed on the progress of the reevaluation program as necessary, but not less frequently than once a year.
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