Seismic safety: An element of OECD/NEA work · 2010. 10. 19. · Alejandro Huerta NEA - SSI...

Seismic safety: An element of OECD/NEA work

Alejandro Huerta NEA Nuclear Safety Division

Alejandro Huerta NEA - SSI Workshop October 2010 1

Andrei Blahoianu Andrew Murphy CNSC ,IAGE Chair USNRC, Chair IAGE Seismic Group

What is the OECD ?What is the OECD ?


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)

NEA CharacteristicsNEA Characteristics

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


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


NEA CommitteesNEA Committees

5

RWMC

Radioactive Waste

Management Committee

CRPPH

Committee on Radiation Protection and Public

Health

CSNI

Committee

Installations

CSNI

Committee on the

Safety of Nuclear

Installations

CNRA

Committee on Nuclear Regulatory

CNRA

Committee on Nuclear Regulatory Activities

NDC

Committee for Technical &

Economic Studies on Nuclear

Development & the Fuel Cycle

NSC

Nuclear Science Committee

Data Bank

NLC

Nuclear Law

Committee

Steering Committee for Nuclear Energy

Alejandro Huerta NEA - SSI Workshop October 2010

CNRACNRA ActivitiesActivities

Inspection practices

Operating Experience Feedback

Incident Reporting System (IRS)

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‟

Regulation of New Reactors

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)


CSNICSNI StructureStructure

C OMMITTEE ON THE S AFETY OF N UCLEAR I NSTALLATIONS ( 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

CSNI P ROGRAMME R EVIEW G ROUP ( PRG )

C HAIRMAN : M . H IRANO - S ECRETARY : G . L AMARRE

SMA 2 G ROUP ( S AFETY M ARGINS )

C HAIR : M . Z IMMERMAN

S ECRETARY : A . A MRI

July 2010

W ORKING G ROUPS

T ASK G ROUP ON F ACILITIES FOR A DVANCED R EACTORS

C HAIR : J . U HLE


F UEL S AFETY

( WGFS )

C HAIR : T . F UKETA

S ECRETARY : R . R EHACEK

H UMAN &

O RGANISATIONAL

F ACTORS

( WGHOF )

C HAIR : D . T ASSET

S ECRETARY : G. LAMARRE .

I NTEGRITY OF M E TAL

C OMPONENTS &

S TRUCTURES

C HAIR : C . F AIDY

S EISMIC B EHAVIOUR OF

S TRUCTURES

C HAIR : A . M URPHY

C ONCRETE S TRUCTURES

A GEING

C HAIR : L . D E M ARNEFFE

I NTEGRITY AND

A GEING OF

C OMPONENTS AND

S TRUCTURES

( IAGE )

C HAIR : A . B LAHOIANU

S ECRETARY : A . H UERTA

A NALYSIS AND

M ANAGEMENT OF

A CCIDENTS

( WGAMA )

C HAIR : I . T OTH


R ISK

A SSESSMENT

( WGR ISK )

C HAIR : N . S IU


F UEL C YCLE S AFETY

( WGFCS )

C HAIR : P . N OCTURE

S ECRETARY : R . R EHACEK

DiDELSYS2 GROUP

C HAIR : . J. BICKEL

S ECRETARY : . A. HUERTA

OECD - NEA

J OINT R ESEARCH P ROJECTS


IAGEIAGE MandateMandate

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

operating & new NPPs and research reactors covering the entire life cycle

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


Initial NEA Seismic Safety ActivitiesInitial NEA Seismic Safety Activities

Specialist meeting on the anti-seismic design of nuclear installations (1975) NEA/CSNI-7

Group of experts on reference seismic ground motions in nuclear safety assessments (1978) NEA/CSNI-26

Specialist meeting on the 1976 Friuli earthquake and the antiseismic design of nuclear installations (1977) NEA/CSNI-28

Specialist meeting on probabilistic methods in seismic assessment for nuclear power plants (1980) NEA/CSNI-44

Second CSNI Specialist Meeting on Probabilistic Methods in Seismic Risk Assessment for Nuclear Power Plants (1983) NEA/CSNI-76

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


IAGE Seismic Group StrategiesIAGE 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:

– 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.


IAGE Seismic Group AchievementsIAGE Seismic Group Achievements

• 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


IAGE Seismic Group Current ActivitiesIAGE 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


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.

IAGEIAGE Seismic Group Current ActivitiesSeismic 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

IAGEIAGE Seismic Group Current ActivitiesSeismic Group Current Activities


http://www.nea.fr/nsd/workshops/Kashiwazaki-2010/






IAGEIAGE Seismic Group Planned ActivitiesSeismic 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


WS on Soil Structure Interaction (SSI) WS on Soil Structure Interaction (SSI) Knowledge and Effect on the Seismic Knowledge and Effect on the Seismic Assessment of Assessment of NPPsNPPs Structures and Structures and

ComponentsComponents • 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


• 77 Participants from 13 Member Countries and 2 International Organisations

• 32 papers including 5 invited papers – 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


ComponentsComponents


• Opening Session

• Technical Session – 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


ComponentsComponents


SummarySummary

• 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


Seismic safety: An element of OECD/NEA work · 2010. 10. 19. · Alejandro Huerta NEA - SSI...

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