MDEP DESIGN SPECIFICWORKING GROUPS
3rd MDEP Conference
14 – 15 May 2014, Bethesda, MD
Lawrence Burkhart, U.S. NRC
Chair, AP1000WG

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MDEP Structure

Policy Group (PG)
Steering TechnicalCommittee (STC)

Digital I&C

Accidents &Transients

EPR Working Group

SevereAccident

AP1000 Working Group

Probabilistic
SafetyAssessment

Digital I&C Working Group

Codes and Standards
Working Group
APR1400 Working Group

SevereAccidents+ Ad hoc
experts
subgroups
TECHNICAL EXPERTS SUBGROUPS

Vendor Inspection
Cooperation Working Group

VVER Working Group(new)
ABWR Working Group(new)
DESIGN SPECIFIC WORKING GROUPS:
CO-OPERATIONISSUE SPECIFIC WORKING GROUPS:CONVERGENCEMDEP Library
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ABOUT DSWGs

Design-Specific Working Groups (DSWG)
Terms of Reference
Share information and cooperate on reactor design reviews and construction
and commissioning oversightParticipants are MDEP members who are actively reviewing specific designs
or plan to engage in safety reviews
Formed when 3 or more members agree to cooperate on design reviews
Important that the regulatory authority has agreements and/or proceduresin place to allow sharing and protection of vendor’s proprietary informationon the design to allow free exchange of information among the DSWG
members
Each DSWG has a Programme Plan detailing
Goals, work plan, outputs/products, key stakeholders
Fukushima lessons-learned to be considered in all DSWGs
Key message: Each regulator retains its sovereign authority and responsibility forlicensing new reactors in its respective country
Goal is to make each regulator’s reviews of specific designs more safety-focused
MDEP 3rd Conference - 2014

3ABOUT DSWGs

Design-Specific Working Groups (DSWG)
EPRWG (efforts started prior to formation of MDEP)
National regulatory authorities fromCanada, China, Finland, France, India, U.K., U.S.A
Technical expert subgroups on DI&C, Severe Accident, Accidents andTransients, and PSA
Other issues addressed: Fukushima insights, commissioning/ITP, radiation
protection, etc.
Produced common position on Fukushima related issues
Drafting common position on commissioning (First Plant Only Test crediting)Technical experts subgroups progress
PSA comparison in initiating events
Digital I&C report
CHRS/SAHRS report and pH control report from Severe Accidents TESG
Survey on accidents and transients
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Green: chair WG – Red: vice-chair WG

ABOUT DSWGs

Design-Specific Working Groups
AP1000WG (started with MDEP activities)
National regulatory authorities fromCanada, China, Sweden, U.K., U.S.A
Issues addressed/being addressed; Squib valves, CRDMs, shield building,DI&C, vendor issues
Other issues addressed: Fukushima insights, commissioning/ITP
Discussions and cooperation on pre-operational testing/initial test program
activities
Exchanges on technical topics (RCPs, Squib valves, etc.)
Sharing of specific information among members (NRC-CNSC for CSNSC phase 2
review of the design, NRC and NNSA to exchanges, support to UK GDA)
Fukushima lessons learned: draft common position
Coordination with VICWG on vendor inspections/AP1000 design implementation

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ABOUT DSWGs

Design-Specific Working Groups
APR1400WG (started in 2013)
National regulatory authorities fromFinland, South Korea, United Arab Emirates, U.S.A.
Discussion of design differences in each country
Other issues: Fukushima lessons learned, CSFI issues
Technical topics to set up expert subgroups: GSI 191 (Accidents and Transients),
Severe AccidentFramework to exchange proprietary information

VVERWG (started in 2014)
National regulatory authorities from
Finland, India, Russian Federation, Turkey
Technical discussions on VVER designs (AES 92/VVER-1000)
Topics to be addressed: Severe accidents, Reactor vessel and primary circuitspecificities in VVER designs, Safety Systems
To tackle
Fukushima lessons learned
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ABOUT DSWGs

Design-Specific Working Groups
ABWRWG (started in 2014)
National regulatory authorities from
Finland, Japan, Sweden, U.K., U.S.A
Discussions on design differences (different vendors)
Identified topics of interest for technical experts discussions
I&C
Severe accidents (prevention & mitigation)
To prepare a common position paper on “Fukushima lessons learned”
Set up a clear framework for exchange of proprietary information

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Important Outcomes/Aspects

Interactions with Stakeholders
Visits to construction sites
Exchange of safety review insights on a real timebasis
Discussion of important technical issues in depthTechnical reviewer to reviewer connections/close
relationships
Addressing the same issues in each country to anadequate level of safety consistent with national lawsIssuance of Common Positions
Feed input to STC and issue specific working groups
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THANK YOU!

www.oecd-nea.org/mdep

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