Upload
others
View
3
Download
0
Embed Size (px)
Citation preview
Earthquake-Related Activities at the U.S. Nuclear Regulatory Commission
Dr. Annie Kammerer
China Earthquake Administration
Representatives’ Visit with NEHRP
Agencies
National Science Foundation HQ
December 2011
•The nuclear renaissance & Fukushima response
•Overview of the NRC & where research fits
•The purpose and structure of NRC seismic
research program
•Current & upcoming research topics
•Opportunities for coordination
Presentation Contents
• 1950s to 1970s US built plants
• 1979 Three Mile Island Accident
• 1986 Chernobyl Nuclear Disaster
• 435 nuclear plants in 30 countries
generating 16% of total power (104 in US)
• Changes in energy policy •New financial incentives in US energy policy
•Certified design concept becomes law
•Time limits on NRC response
History
• Possibly 35 new reactors in coming years
• Approximately 23 applications have already
come into the NRC
•Early site permits
•New plant Combined Operating Licenses
•Design Certification Documentation
• 3 Early site permits and 1 Certified Design
already issued
• Pre-submission meetings on advanced
reactors designs
Now – “the nuclear renaissance”
Submitted applications
Fukushima
Lessons Learned
Report with
Significant
Recommendations
for changing NRC
regulations and
practices
NRC
ML111861807
• The NRC has principally deterministically-based
regulations with risk assessments used for
consideration of defense-in-depth for beyond-
design-basis events. Plants are deterministically
designed but have to show acceptable risk
through a SPRA before fuel loading.
• Recommendation 1: Establish a logical,
systematic, and coherent regulatory framework
for adequate protection that appropriately
balances defense-in-depth and risk
considerations.
NRC NTTF Recommendations
• Recommendation 2: Require Licensees to
reevaluate and upgrade as necessary the
design-basis seismic and flooding protection of
SSCs for each operating reactor • 2.1 Order licensees to reevaluate the seismic and
flooding hazards at their sates against current
NRC requirements and guidance, and if necessary
update the design basis and SSCs important to
safety to protect against the updated hazards
(note: the NRC already had GI-199)
NRC NTTF Recommendations
• 2.2 Initiate rulemaking to require licensees to
confirm seismic hazards and flooding hazards
every 10 years and address any new and
significant information. If necessary update the
design basis for SSCs important to safety to protect
against updated hazards.
• 2.3 Order Licensees to perform seismic and
flood protection walkdowns to identify & address
plant-specific vulnerabilities and verify the
adequacy of monitoring and maintenance for
protection features…
NRC NTTF Recommendations
Point
“Site” R
fR(r)
+ + =
SSCs
Chapter 2 Earth Science & Natural Hazards
Chapter 3 Earthquake Engineering
Ch
ap
ter
4 In
tern
ati
on
al A
cti
vit
ies
Ch
ap
ter
5 R
eg
ula
tory
Gu
ide
s
Contents of the Research Program Plan
Seismic Hazard Assessment
• Central and Eastern US Seismic Source Characterization project for Nuclear Facilities (CEUS SSC)
Source Characterization
• Next Generation Attenuation Relationships for the Central and Eastern (NGA-East)
Ground motion prediction equations
• Practical Application of the SSHAC Guidelines
PSHA process guidance
Seismic Hazard Assessment
• Central and Eastern US Seismic Source Characterization project for Nuclear Facilities (CEUS SSC)
Source Characterization
• Next Generation Attenuation Relationships for the Central and Eastern (NGA-East)
Ground motion prediction equations
• Practical Application of the SSHAC Guidelines
PSHA process guidance
NEARLY
DONE
NEARLY
DONE
Earthquake Engineering
• Site Response • Seismic Isolation
• Small Modular Reactors
• SSI modeling of NPPs under non-traditional loads
• Correlated seismic performance of similar SSCs
• Technology-neutral performance-based risk-informed framework for seismic design and review
• Dynamic earth pressures on deep foundations
• Testing and modeling of multidirectional cohesionless soils
Current Research
Earthquake Engineering
• Fully probabilistic SSI analyses
• True dispersion of SSC response
• Ground motion selection for NPPs
• Fully randomized geologic profiles
• Response of deep soil sites
• Next generation seismic probabilistic risk assessments
• Improved plant-level fragility and HCLPF assessments
Identified future NRC research topics
Opportunities for Cooperation: SI
Prepared by: A. M. Kammerer1,
A. S .Whittaker2, M. C.
Constantinou2
1US NRC 2University of Buffalo
With information/submissions
by JNES and EdF
Current draft 95% complete
Goal of today’s meeting is to present
the technical content of the
document and take questions.
• In 2008 NRC began new research in SI
• NRC research is addressing key items
• Vertical and beyond-design-basis loading
• Numerical model development for NRC’s in-house analytical tool (NRC ESSI Simulator)
• Developed performance-based criteria for regulation of NPPs using seismic isolation systems
• Testing of isolator systems on eDefense shaketable to confirm analysis tools, models, and assumptions (testing performed, but not yet used to validate isolator models)
• Sensitivity study on isolator mechanical properties
Opportunities for Cooperation: SI
NGA-East
• Next Generation Attenuation Relationships
for Central and Eastern North America
(participation by Canada, Australia & other
countries in stable continental regions)
• SSHAC Level 3 project to be complete 2014
• Managed and led by the Pacific Earthquake
Engineering Research Center at University
of California, Berkeley
NGA-East
• Complex study with significant research and
development components
• Global SCR database being collected and
beneficial research for SCRs globally
• New work in geotechnics, source inversion,
and a large number of simulations to
complement limited earthquake database
NGA-East
NGA-East
Simplified
Flow Chart
of Activities
• Complete project plan, videos and
presentations from past workshops, and
other documentation available on-line
• http://peer.berkeley.edu/ngaeast/
Title Goes Here
Thank You
Earthquake-Related Activities at the
U.S. Nuclear Regulatory Commission