ML093080508
| ML093080508 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 11/05/2009 |
| From: | Wang A Plant Licensing Branch IV |
| To: | Plant Licensing Branch IV |
| Wang, A B, NRR/DORL/LPLIV, 415-1445 | |
| References | |
| TAC ME0174, TAC ME0175 | |
| Download: ML093080508 (3) | |
Text
November 5, 2009 MEMORANDUM TO:
File FROM:
Alan Wang, Project Manager /RA/
Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
SUBJECT:
DIABLO CANYON POWER PLANT UNIT NOS. 1 AND 2 -
REVIEW OF POTENTIAL NEW FAULT AT THE DIABLO CANYON POWER PLANT SITE (TAC NOS. ME0174 AND ME0175)
During a November 21, 2008, conference call, Pacific Gas and Electric Company (PG&E, the licensee) provided to the Nuclear Regulatory Commission (NRC) staff preliminary results from ongoing seismic studies that indicate that there may be a plane of earthquake epicenters approximately 15 kilometers (km) in length, located approximately 1 km offshore from Diablo Canyon Power Plant (DCPP) site. PG&E is collaborating with the U.S. Geological Survey (USGS) to collect and analyze new geological, geophysical, and seismic data to develop improved tectonic models for the central California coastal region through a Collaborative Research and Development Agreement. The research is in its second year of a 5-year program. In December 2008, PG&E provided to the staff an action plan detailing field investigations and analyses to better characterize the potential shoreline fault near the DCPP site. The interim studies are not due until mid-2010 with the final report due December 2010.
The NRC staff has reviewed the Action Plan and concluded that the Action Plan and schedule are reasonably complete and comprehensive in scope for this study. In addition, in the interim, the NRC performed an independent deterministic seismic hazard analysis of the potential fault based on the preliminary information currently available to confirm the licensees conclusions regarding the operability of DCPP. With the completion of this analysis and the related communications plan (ADAMS Accession No. ML090970544), TAC Nos. ME0174 and ME0175 are complete and new TAC numbers will be opened when the final study is submitted to the NRC staff.
November 5, 2009 MEMORANDUM TO:
File FROM:
Alan Wang, Project Manager /RA/
Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
SUBJECT:
DIABLO CANYON POWER PLANT UNIT NOS. 1 AND 2 -
REVIEW OF POTENTIAL NEW FAULT AT THE DIABLO CANYON POWER PLANT SITE (TAC NOS. ME0174 AND ME0175)
During a November 21, 2008, conference call, Pacific Gas and Electric Company (PG&E, the licensee) provided to the Nuclear Regulatory Commission (NRC) staff preliminary results from ongoing seismic studies that indicate that there may be a plane of earthquake epicenters approximately 15 kilometers (km) in length, located approximately 1 km offshore from Diablo Canyon Power Plant (DCPP) site. PG&E is collaborating with the U.S. Geological Survey (USGS) to collect and analyze new geological, geophysical, and seismic data to develop improved tectonic models for the central California coastal region through a Collaborative Research and Development Agreement. The research is in its second year of a 5-year program. In December 2008, PG&E provided to the staff an action plan detailing field investigations and analyses to better characterize the potential shoreline fault near the DCPP site. The interim studies are not due until mid-2010 with the final report due December 2010.
The NRC staff has reviewed the Action Plan and concluded that the Action Plan and schedule are reasonably complete and comprehensive in scope for this study. In addition, in the interim, the NRC performed an independent deterministic seismic hazard analysis of the potential fault based on the preliminary information currently available to confirm the licensees conclusions regarding the operability of DCPP. With the completion of this analysis and the related communications plan (ADAMS Accession No. ML090970544), TAC Nos. ME0174 and ME0175 are complete and new TAC numbers will be opened when the final study is submitted to the NRC staff.
DISTRIBUTION:
NON-PUBLIC LPLIV Reading File RidsNrrDorlLpl4 Resource RidsNrrPMDiabloCanyon Resource RidsNrrLAJBurkhardt Resource ADAMS Accession No.: ML093080508 OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/LPL4/BC NRR/LPL4/PM NAME AWang JBurkhardt MMarkley CFLyon for AWang DATE 11/4/09 11/4/09 11/5/09 11/5/09
OFFICIAL RECORD COPY