Embed Size (px)
Citation preview
1
Central Coastal CaliforniaSeismic Imaging ProjectCalifornia Energy Commission Workshop
Dr. Stuart NishenkoPG&E
April 27, 2015
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
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
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.”
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
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
PG&E/PUC/IPRP Coordination2010 - 2015
18 Public and Information Meetings
9 IPRP Reports + Evaluation Poster
Before and After: Comparison of Hazard Significant Parameters
Sensitivity Hazard / 10-4 @ 2 gSensitivity Hazard / 10-4 @ 2 g
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
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
23
12
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
1
2b3
2a
Central Coastal California Seismic Imaging Project 2012
Multi Beam Echo Sounding
Marine Geophysical Surveys
Mapping the Sea Floor – Multi Beam Echo Sounding
San Luis Obispo Bay 3D Survey
3D View of San Luis Obispo Bay
2012 Data Collection Area
2011 Data Collection Area
Shoreline Fault Offset San Luis Obispo Bay
Hosgri Channel OffsetsOffshore Point Sal
VibroSeis in Irish Hills
Accelerated Weight Drop
2D/3D Land Seismic Reflection Surveys DCPP/ Irish Hills/ Los Osos Valley
EnviroVibe at DCPP
Irish Hills 2011 2D/3D Seismic Acquisition Geometry
Central Coastal California Seismic Imaging Summary
Central Coastal California Seismic Imaging Summary
Point Buchon Ocean Bottom Seismometer Project
Central Coastal CA Seismic Imaging Report
pge.com/en/safety/systemworks/dcpp/seismicsafety/report.pge
2010-2012 Marine Seismic Reflection Data
https://walrus.wr.usgs.gov/NAMSS/surveys/survey/469/
2011-2012 Land Seismic Reflection Data
http://www.iris.edu/hq/http://ds.iris.edu/data/reports/2014/14-027/
