1 central coastal california seismic imaging project california energy commission workshop dr....
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Central Coastal CaliforniaSeismic Imaging ProjectCalifornia Energy Commission Workshop
Dr. Stuart NishenkoPG&E
April 27, 2015
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Overview
PG&E Long Term Seismic Program• Continually assesses seismic safety at Diablo
Canyon Power Plant (DCPP)• Advanced seismic research (conducted 2010-2013)
has provided a more detailed picture of the region’s complex geology
• Studies published in 2014 provide an unprecedented look into the Earth around DCPP and further defines the level of seismic activity that the earthquake faults are capable of producing
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Overview
Research confirms previous analyses:• The plant is designed to withstand the ground
motions, or shaking, from earthquakes• Major components can continue to perform their
safety functions during and after a major seismic event
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History of Assembly Bill 1632
In 2006:
California Assembly Bill 1632 requires the California Energy Commission (CEC) carry out:
“…a compilation and assessment of existing scientific studies…to determine the potential vulnerability to a major disruption due to aging or a major seismic event of large base load generation facilities of 1,700 megawatts or greater.”
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History of Assembly Bill 1632
In 2008:
California Energy Commission (CEC) issues an Assessment of California’s Nuclear Power Plants: AB 1632 Report
- Recommends PG&E update seismic hazard assessments;
- Directs the use of 3D geophysical seismic reflection mapping and other advanced techniques to supplement previous and ongoing research programs
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History of Assembly Bill 1632
From 2010 – 2015:
In response to the CEC recommendations, the California Public Utilities Commission (CPUC) directs PG&E to complete the 3D seismic studies and convenes an Independent Peer Review Panel (IPRP) to review, evaluate and report on PG&E’s study plans and resultsIPRP membership :
- California Coastal Commission- California Emergency Management Agency - California Energy Commission- California Geological Survey- California Public Utility Commission- California Seismic Safety Commission - San Luis Obispo County
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PG&E/PUC/IPRP Coordination2010 - 2015
18 Public and Information Meetings
9 IPRP Reports + Evaluation Poster
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Before and After: Comparison of Hazard Significant Parameters
Sensitivity Hazard / 10-4 @ 2 gSensitivity Hazard / 10-4 @ 2 g
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Improvements in Geophysical Data Acquisition
- Geophysical Instrumentation
- Geophysical Data Processing
- DGPS Navigation
- Geographic Information Systems
- 3D v 2D Seismic Imaging
- X-Rays vs CT scans
- Revolution in Spatial Resolution
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1. Multi Beam Echo Sounder & Potential Field Mapping*
2. 2D/3D Low Energy Seismic Surveys (LESS) - Shoreline Fault Zone
3. 2D/3D Onshore Seismic Reflection Surveys - Irish Hills/Los Osos Valley
*Long Term Seismic Program
Central Coastal California Seismic Imaging Project 2009 - 2011
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1. 3D LESS – Southern Shoreline Fault Zone
2a. 3D LESS – Hosgri Fault Zone, Point Sal
2b. 3D LESS – Hosgri Fault Zone, Estero Bay
3. 2D/3D Onshore Survey, Western Irish Hills/ DCPP
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2b3
2a
Central Coastal California Seismic Imaging Project 2012
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Multi Beam Echo Sounding
Marine Geophysical Surveys
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Mapping the Sea Floor – Multi Beam Echo Sounding
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San Luis Obispo Bay 3D Survey
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3D View of San Luis Obispo Bay
2012 Data Collection Area
2011 Data Collection Area
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Shoreline Fault Offset San Luis Obispo Bay
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Hosgri Channel OffsetsOffshore Point Sal
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VibroSeis in Irish Hills
Accelerated Weight Drop
2D/3D Land Seismic Reflection Surveys DCPP/ Irish Hills/ Los Osos Valley
EnviroVibe at DCPP
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Irish Hills 2011 2D/3D Seismic Acquisition Geometry
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Central Coastal California Seismic Imaging Summary
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Central Coastal California Seismic Imaging Summary
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Point Buchon Ocean Bottom Seismometer Project
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Central Coastal CA Seismic Imaging Report
pge.com/en/safety/systemworks/dcpp/seismicsafety/report.pge
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2010-2012 Marine Seismic Reflection Data
https://walrus.wr.usgs.gov/NAMSS/surveys/survey/469/
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2011-2012 Land Seismic Reflection Data
http://www.iris.edu/hq/http://ds.iris.edu/data/reports/2014/14-027/