SSI Workshop Introduction and Objectives a Huerta NEA

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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‟sexports

produce > 2/3goods & services

generates about83% nuclearpower in world.

343 reactors unitsin 17 OECDcountries. 15 moreunits underconstruction.

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 amongdeveloped 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 scientificand 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 safetyand the safety expertise capability in member countries

• assist member countries in the resolution of safety issues and strengthenconfidence 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 necessaryto ensure the safety of existing facilities, in particular their long-termoperation, and future nuclear facilities and activities

• enhance the efficiency and effectiveness of the regulatory process andencourage harmonization of the regulatory processes




NEA CommitteesNEA Committees

5

RWMC

Radioactive

Waste

ManagementCommittee

CRPPH

Committee on

Radiation

Protection

and Public

Health

CSNI

Committee

on the

Safety of Nuclear

Installations

CNRA

Committee

on Nuclear

RegulatoryActivities

NDC

Committee for

Technical &

Economic Studieson 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 regulatoryorganisations. Flash@news.

Senior group on the „Regulator‟s Role in AssessingLicensee Controls of Vendors and Other ContractedServices‟

Regulation of New Reactors

Senior task group on „Challenges in Long TermOperation of Nuclear Power Plants – Implications forRegulatory 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

S ECRETARY : A . A MRI

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 S ECRETARY : A . A MRI

R ISK A SSESSMENT

( WGR ISK ) C HAIR : N . S IU S ECRETARY : A . A MRI

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 ongeneric technical aspects of integrity and ageing of components and structures, and review national andinternational programmes concentrating on research,operational aspects and regulation.

Stimulate, in relevant technical areas, new research andrecommend possible international co-operative projects.

Develop technical positions on specific integrity issues of

operating & new NPPs and research reactors covering theentire life cycle

identify areas where further work is needed.

Discuss the potential impact of ageing and other challenges tointegrity on the safety, regulation and operability of operatingand 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 nuclearinstallations (1975) NEA/CSNI-7

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

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

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

Second CSNI Specialist Meeting on Probabilistic Methods inSeismic 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 setup in 1996. The first taskwas to propose an actionplan to the CSNI detailingkey issues that have beenconsidered as important asfollows:

– Piping analysis and design – Engineering characterization

of seismic input

– Aging effects

– Validation of analysismethods

– Re-evaluation of existing

facilities and assessment of beyond design basis

• The figure illustrates thedifferent areas of expertiseand the topics addressed.




IAGE Seismic Group AchievementsIAGE Seismic Group Achievements

• Proceedings of the Workshop on Recent Findings and Developments inProbabilistic Seismic Hazards Analysis (PSHA) Methodologies andApplications, NEA/CSNI/R(2009)1

• Summary Report on OECD/NEA Seismic Workshops,NEA/CSNI/R(2008)7

• Differences in Approach between Nuclear and Conventional SeismicStandards with Regard to Hazard Definition, NEA/CSNI/R(2007)/17

• IAGE & WGRisk Specialists Meeting on Seismic Probabilistic SafetyAssessment (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 SeismicEngineering, NEA/CSNI/R(2003)18

• TOP on Apparent Discrepancies Between Nuclear and ConventionalSeismic Standards, NEA/CSNI/R(2003)4

• Lessons Learned from High Magnitude Earthquake with Respect toNuclear 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 anearthquake

• The product will be a catalogue of seismic events recordedby NPPs around the world, describing the level of theearthquake and the consequences on the plant.

• The group agreed to collect all and present at each Seismicsub-group meeting information about earthquakes inMember countries.

• The structure, organization, management, follow-up and

updating of this catalogue and the data collected is thebasis of the activities of the IAEA ISSC WA 9: Informationand Notification System




NEA/CSNI-IAGE - JNES Workshop on Seismic Observation inDeep 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 onSeismic Safety of Nuclear Installations: "Mission for Technology

Innovation toward Next Generation“ 24-26 November 2010

• Symposium will include a second embedded workshop onSeismic Isolation of Nuclear Facilities.

• The objectives of the workshop will be (i) overview of currentstatus and activities on seismic observation in deep boreholes

around the world; (ii) sharing information of recent developmenton survey, observation and analyzing techniques, simple ways of soil properties evaluation; (iii) discussion on related issues andtopics.

IAGEIAGE Seismic Group Current ActivitiesSeismic Group Current Activities




NEA/CSNI-IAGE - JNES Workshop on Seismic Observation inDeep Boreholes and their Applications

• The workshop will address the following topics:

– Recent status on implementation of seismic observations indeep boreholes in individual states

– Development on technology necessary to conduct seismicobservation in the extremely deep borehole

– Analysis of seismic observation results in the deep boreholeand its applications (Other practical use)

– Improvement of characteristics evaluation methodology atdeep stratum by geophysical exploration in comparison withdeep 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 safetyassessment

• Application of earthquake experience information to nuclear

facilities

• Ageing management and retrofitting requirements in seismicengineering

• Challenges in seismic safety assessment for new and advancedreactors

• Soil structure interaction analysis methods




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

ComponentsComponents• To review and disseminate recent findings and issues in SSI:

– A description of the state-of-the-art engineering practices regarding SSIanalysis

– 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 includingthe topic of base isolation and treatment of uncertainties related to SSIparameters.

–A comparison of SSI results to available structural response recordsproduced by real earthquakes

• Better understanding of the current SSI analysis methodsand practices and their effects on assessment of NPPstructures and components




• 77 Participants from 13 Member Countries and 2International 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 SomeSpecial Topics (7)

• Panel Discussion at the end of each day

• Final Session – Conclusions , Lessons Learned andRecommendations


ComponentsComponents




SummarySummary

• NEA is addressing seismic safety matters since early 70‟s

• CSNI/IAGE working group constitutes a forum to exchangeviews, information and experience on generic technical aspectsof integrity and ageing of components and structures, as well asthe seismic behaviour of structures systems and components.

• Based on international experience on probabilistic seismichazards analysis and seismic PSA, on recent earthquakes, and

on the nuclear “renaissance”, the priority of NEA countries foraddressing 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 beyonddesign basis conditions


Documents

SSI Workshop Introduction and Objectives a Huerta NEA