Seismic safety:
An element of OECD/NEA work
Alejandro Huerta
NEA Nuclear Safety Division
Andrei Blahoianu
CNSC ,IAGE Chair
Andrew Murphy
USNRC, Chair IAGE
Seismic Group
Alejandro Huerta NEA - SSI Workshop October 2010
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What is the OECD ?

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33 Member
countries
< 20% World‟s
population
> 3/5 world‟s
exports
produce > 2/3
goods & services
generates about
83% nuclear
power in world.
343 reactors units
in 17 OECD
countries. 15 more
units under
construction.
 27 Organizational Units
• Nuclear Energy Agency (NEA)
Alejandro Huerta NEA - SSI Workshop October 2010
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NEA Characteristics

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Small size and budget
(80 staff members; budget of 13 million euros, +
voluntary contributions and projects)
Large representation (85% of the world‟s nuclear power
capacity)
Non-political forum; climate of mutual trust
Tries to pool world‟s best nuclear expertise among
developed countries
Narrow focus: in-depth scientific, technical, legal work
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NEA – Nuclear Safety
The NEA promotes nuclear safety by supporting the development of
effective and efficient regulation and oversight of nuclear installations
and activities, and by helping to maintain and advance the scientific
and technological knowledge base.
To achieve this, the NEA will:
•
facilitate the exchange of safety information among member countries
– identify significant generic issues and trends
– develop common understanding and resolution approaches
•
foster the continuous enhancement of the knowledge base of nuclear safety
and the safety expertise capability in member countries
•
assist member countries in the resolution of safety issues and strengthen
confidence in the solutions and their implementation
•
address safety issues associated with new technologies and reactor designs
•
help to maintain an adequate level of capability and competence necessary
to ensure the safety of existing facilities, in particular their long-term
operation, and future nuclear facilities and activities
•
enhance the efficiency and effectiveness of the regulatory process and
encourage harmonization of the regulatory processes
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NEA Committees
Steering Committee for Nuclear Energy
CSNI
CNRA
RWMC
NSC
NDC
Committee
on the
Safety of
Nuclear
Installations
Committee
on Nuclear
Regulatory
Activities
Radioactive
Waste
Management
Committee
Nuclear Science
Committee
Committee for
Technical &
Economic Studies
on Nuclear
Development &
the Fuel Cycle
Data
Bank
CRPPH
NLC
Committee on
Radiation
Protection
and Public
Health
Nuclear
Law
Committee
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CNRA Activities

Inspection practices

Operating Experience Feedback

Incident Reporting System (IRS)
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Public communication of nuclear regulatory
organisations. Flash@news.

Senior group on the „Regulator‟s Role in Assessing
Licensee Controls of Vendors and Other Contracted
Services‟
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Regulation of New Reactors
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Senior task group on „Challenges in Long Term
Operation of Nuclear Power Plants – Implications for
Regulatory Bodies‟

NEA High Level Forum on Long Term Operation
(June 8, 2011)
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CSNI Structure
C OMMITTEE
ON THE
S AFETY
OF
N UCLEAR
INSTALLATIONS
( CSNI )
C HAIRMAN : J . R EPUSSARD - S ECRETARY : J . R EIG
B UREAU : K . S ODA ( V - C ) , B . S HERON ( V - C ) , L . H AHN , J . - M . C AVEDON , A . W HITE
July
2010
CSNI P ROGRAMME R EVIEW G ROUP ( PRG )
C HAIRMAN : M . H IRANO - S ECRETARY : G . L AMARRE
W ORKING
F UEL C YCLE S AFETY
( WGFCS )
C HAIR :
P. NOCTURE
S ECRETARY : R . R EHACEK
A NALYSIS AND
M ANAGEMENT OF
A CCIDENTS
( WGAMA )
R ISK
A SSESSMENT
( WGR ISK )
C HAIR :
N . S IU
S ECRETARY : A . A MRI
C HAIR :
I. T OTH
S ECRETARY : A . A MRI
G ROUPS
I NTEGRITY AND
A GEING OF
C OMPONENTS AND
S TRUCTURES
( IAGE )
C HAIR :
A . B LAHOIANU
S ECRETARY : A . H UERTA
H UMAN &
O RGANISATIONAL
F ACTORS
( WGHOF )
J OINT
S EISMIC B EHAVIOUR OF
S TRUCTURES
C HAIR : A . M URPHY
C HAIR :
T . F UKETA
S ECRETARY : R . R EHACEK
C HAIR :
D . T ASSET
S ECRETARY : G.. LAMARRE
DiDELSYS2 GROUP
C ONCRETE S TRUCTURES
A GEING
C HAIR : L . D E M ARNEFFE
OECD - NEA
R ESEARCH P ROJECTS
F UEL S AFETY
( WGFS )
C HAIR : .
S ECRETARY :
T ASK G ROUP
I NTEGRITY OF M E TAL
C OMPONENTS &
S TRUCTURES
C HAIR : C . F AIDY
Alejandro Huerta NEA - SSI Workshop October 2010
ON
J. BICKEL
A..HUERTA
F ACILITIES FOR A DVANCED R EACTORS
C HAIR : J . U HLE
S ECRETARY : A . A MRI
SMA 2 G ROUP ( S AFETY M ARGINS )
C HAIR : M . Z IMMERMAN
S ECRETARY : A . A MRI
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IAGE Mandate

Forum to exchange views, information and experience on
generic technical aspects of integrity and ageing of
components and structures, and review national and
international programmes concentrating on research,
operational aspects and regulation.

Stimulate, in relevant technical areas, new research and
recommend possible international co-operative projects.

Develop technical positions on specific integrity issues of
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operating & new NPPs and research reactors covering the
entire life cycle
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identify areas where further work is needed.

Discuss the potential impact of ageing and other challenges to
integrity on the safety, regulation and operability of operating
and new nuclear power plants.

IAGE products: workshops, SOARs, topical opinion papers
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Initial NEA Seismic Safety Activities

Specialist meeting on the anti-seismic design of nuclear
installations (1975) NEA/CSNI-7
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Group of experts on reference seismic ground motions in
nuclear safety assessments (1978) NEA/CSNI-26
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Specialist meeting on the 1976 Friuli earthquake and the
antiseismic design of nuclear installations (1977) NEA/CSNI28
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Specialist meeting on probabilistic methods in seismic
assessment for nuclear power plants (1980) NEA/CSNI-44
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Second CSNI Specialist Meeting on Probabilistic Methods in
Seismic Risk Assessment for Nuclear Power Plants (1983)
NEA/CSNI-76
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Report of the task group on the seismic behaviour of
structures: NEA/CSNI/R(1996)11
CSNI Decided to establish a sub-group within PWG-3
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IAGE Seismic Group Strategies
•
Seismic Subgroup was set
up in 1996. The first task
was to propose an action
plan to the CSNI detailing
key issues that have been
considered as important as
follows:
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–
•
Piping analysis and design
Engineering characterization
of seismic input
Aging effects
Validation of analysis
methods
Re-evaluation of existing
facilities and assessment of
beyond design basis
The figure illustrates the
different areas of expertise
and the topics addressed.
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IAGE Seismic Group Achievements
•
•
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•
•
•
•
•
•
•
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•
Proceedings of the Workshop on Recent Findings and Developments in
Probabilistic Seismic Hazards Analysis (PSHA) Methodologies and
Applications, NEA/CSNI/R(2009)1
Summary Report on OECD/NEA Seismic Workshops,
NEA/CSNI/R(2008)7
Differences in Approach between Nuclear and Conventional Seismic
Standards with Regard to Hazard Definition, NEA/CSNI/R(2007)/17
IAGE & WGRisk Specialists Meeting on Seismic Probabilistic Safety
Assessment (SPSA) of Nuclear Facilities, NEA/CSNI/R(2007)14
Workshop on Seismic Input Motions Incorporating Recent Geological
Studies, NEA/CSNI/R(2004)22
Experimental Facilities for Earthquake Engineering Simulation
Worldwide, NEA/CSNI/R(2004)10
Workshop on the Relations Between Seismological Data and Seismic
Engineering, NEA/CSNI/R(2003)18
TOP on Apparent Discrepancies Between Nuclear and Conventional
Seismic Standards, NEA/CSNI/R(2003)4
Lessons Learned from High Magnitude Earthquake with Respect to
Nuclear Codes and Standards, NEA/CSNI/R(2002)22
Workshop on the Seismic Re-evaluation of all Nuclear Facilities,
NEA/CSNI/R(2001)13
Workshop on the Engineering Characterisation of Seismic Input,
NEA/CSNI/R(2000)1
PWG3 & PWG5 Workshop on Seismic Risk, NEA/CSNI/R(99)28
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IAGE Seismic Group Current Activities
Survey on Nuclear facilities that have experienced an
earthquake
•
The product will be a catalogue of seismic events recorded
by NPPs around the world, describing the level of the
earthquake and the consequences on the plant.
•
The group agreed to collect all and present at each Seismic
sub-group meeting information about earthquakes in
Member countries.
•
The structure, organization, management, follow-up and
updating of this catalogue and the data collected is the
basis of the activities of the IAEA ISSC WA 9: Information
and Notification System
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IAGE Seismic Group Current Activities
NEA/CSNI-IAGE - JNES Workshop on Seismic Observation in
Deep Boreholes and their Applications
•
Hosted by JNES, 25-26 November 2010, Niigata Institute of
Technology, Kashiwazaki, Niigata, Japan
•
Embedded in the 1st Kashiwazaki International Symposium on
Seismic Safety of Nuclear Installations: "Mission for Technology
Innovation toward Next Generation“ 24-26 November 2010
•
Symposium will include a second embedded workshop on
Seismic Isolation of Nuclear Facilities.
•
The objectives of the workshop will be (i) overview of current
status and activities on seismic observation in deep boreholes
around the world; (ii) sharing information of recent development
on survey, observation and analyzing techniques, simple ways of
soil properties evaluation; (iii) discussion on related issues and
topics.
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IAGE Seismic Group Current Activities
NEA/CSNI-IAGE - JNES Workshop on Seismic Observation in
Deep Boreholes and their Applications
•
The workshop will address the following topics:
– Recent status on implementation of seismic observations in
deep boreholes in individual states
– Development on technology necessary to conduct seismic
observation in the extremely deep borehole
– Analysis of seismic observation results in the deep borehole
and its applications (Other practical use)
– Improvement of characteristics evaluation methodology at
deep stratum by geophysical exploration in comparison with
deep borehole measurements
– Development of technical guide for deep borehole seismic
observation
•
Information of the workshop at:
http://www.nea.fr/nsd/workshops/Kashiwazaki-2010/ or
http://www.jnes.go.jp/seismic-symposium10/index.html
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IAGE Seismic Group Planned Activities
According to the IAGE Integrated Plan and the Seismic
Medium Term Strategies the planned activities are:
•
Probabilistic performance-based approaches for seismic safety
assessment
•
Application of earthquake experience information to nuclear
facilities
•
Ageing management and retrofitting requirements in seismic
engineering
•
Challenges in seismic safety assessment for new and advanced
reactors
•
Soil structure interaction analysis methods
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WS on Soil Structure Interaction (SSI)
Knowledge and Effect on the Seismic
Assessment of NPPs Structures and
Components
• To review and disseminate recent findings and issues in SSI:
– A description of the state-of-the-art engineering practices regarding SSI
analysis
– A description of the issues associated with SSI analysis
– A comparison of SSI analysis approaches: Frequency Domain versus
Time Domain
– Site effect: Simplified (1D) analysis versus 3D analysis and SSI analysis
software limitations.
– A discussion of SSI methodology used in different countries including
the topic of base isolation and treatment of uncertainties related to SSI
parameters.
– A comparison of SSI results to available structural response records
produced by real earthquakes
• Better understanding of the current SSI analysis methods
and practices and their effects on assessment of NPP
structures and components
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WS on Soil Structure Interaction (SSI)
Knowledge and Effect on the Seismic
Assessment of NPPs Structures and
Components
• 77 Participants from 13 Member Countries and 2
International Organisations
• 32 papers including 5 invited papers
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Alain Pecker, Géodynamique et Stuctures, France
Boris Jeremić, University of California, USA
Gail Atkinson, University of Western Ontario, Canada
Takao Nishikawa, Tokyo Metropolitan University, Japan
James J. Johnson, James J. Johnson Associates, USA
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WS on Soil Structure Interaction (SSI)
Knowledge and Effect on the Seismic
Assessment of NPPs Structures and
Components
• Opening Session
• Technical Session
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–
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Day 1 Morning – Introduction Papers (5)
Day 1 Afternoon – Methodologies and Frameworks (6)
Day 2 Morning – Case Studies / Analysis in Frequency Domain (8)
Day 2 Afternoon – Case Studies / Analysis in Time Domain (6)
Day 3 Morning – Case Studies / Analysis in Time Domain and Some
Special Topics (7)
• Panel Discussion at the end of each day
• Final Session – Conclusions , Lessons Learned and
Recommendations
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Summary
•
NEA is addressing seismic safety matters since early 70‟s
•
CSNI/IAGE working group constitutes a forum to exchange
views, information and experience on generic technical aspects
of integrity and ageing of components and structures, as well as
the seismic behaviour of structures systems and components.
•
Based on international experience on probabilistic seismic
hazards analysis and seismic PSA, on recent earthquakes, and
on the nuclear “renaissance”, the priority of NEA countries for
addressing seismic safety issues will focus on:
– Better characterisation of seismic input
– Engineering approach used for seismic qualification of
structures, systems and components (SSC), including aging
effects
– Validation of analytical methods
– Re-evaluation of existing facilities and assessment of beyond
design basis conditions
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