International Workshop on

Dynamic Probabilistic Safety Assessment (DPSA)
and its Role In Risk-Informed Decision-Making
Rockville, MD, USA, 16 - 17 November 2023

Hosted by the United States Nuclear Regulatory Commission (NRC)

Key Dates
30 June 2023
17 July 2023
27 October 2023
27 October 2023
16 - 17 November 2023

Deadline for Abstract Submission
Notification to Authors
Deadline for Attendance Registration
Deadline for Presentation Submission
Workshop

General Information
This is the announcement and call for presentations for the International Workshop on
Dynamic PSA and Its Role in Risk-informed Decision-making being organized under theauspices of the OECD Nuclear Energy Agency (NEA) Committee on the Safety of Nuclear
Installation (CSNI) Working Group on Risk Assessment (WGRISK). The Workshop will be1

hosted by the United States Nuclear Regulatory Commission (U.S. NRC) in Rockville, MD,USA), November 16 - 17, 2023.
Working under the mandate of the CSNI, the main objectives of WGRISK are to maintain,
assess, and advance the technical and scientific knowledge base of PSA methods, tools, data,and analysis practices; to strengthen the interfaces between PSA and the disciplines fromwhich PSA draws; and to facilitate the use of risk assessment results in decision-making andin safety management programs.

Background
Dynamic methodologies for probabilistic safety and risk assessment, continue to advancesteadily. Several (primarily research-oriented) case studies have been published,demonstrating the additional capabilities and insights that dynamic PSA approaches candeliver, while advances in computational power and methods allow problems of increasing
scale to be tackled.
Recognizing that both technical and organizational obstacles to the practical deployment ofdynamic PSA remain, the WGRISK initiated a task entitled Dynamic PSA Methods – Preparing
for the Future to assess the potential role of currently available and emerging DPSA tools andmethodologies in risk-informed decision-making, to identify the practical challenges for theirapplication to support such decisions, and to evaluate the outlook for overcoming thesechallenges. This workshop for the presentation and discussion of dynamic PSA methods andtheir role in risk-informed decision-making is at the center of the second phase of this task,following a survey questionnaire on the topic. This electronic leaflet is the WorkshopAnnouncement.

Workshop Objectives
The objectives of the workshop are to provide a forum to exchange information on the current
and potential application of DPSA methods in risk-informed decision-making and on the stateof the available and emerging tools and methodologies. The participants will also discuss theprincipal technical and organizational obstacles to the practical deployment of dynamic PSA
and the outlook for overcoming these. The perspectives of practitioners, decision-makers, andother nuclear safety professionals with expertise in established (classical) PSA methods aswell as those of dynamic PSA specialists will enrich the workshop.

Suggested topics
Participants are invited to present contributions on topics such as:
Identification of risk-informed decision-making cases (scenarios, nuclear safety issues, etc.)
where the application of dynamic PSA may provide improved or additional insights to support a decision;Experiences with the application of dynamic PSA approaches and the use of their results
by decision-makers;

Integration/implementation of results from dynamic PSA in risk-informed decision-making;2Current safety issues and risk management decisions where traditional (non-dynamic) PSA
approaches have potential shortcomings;

Technical challenges to the practical deployment of dynamic PSA and the outlook for addressing these, e.g., coverage of rare events, human factor-related models, computationalissues, methods to identify important insights from the vast amounts of data produced bydynamic PSA simulations;Organizational challenges related to the application of dynamic PSA methods and the useof their results in risk-informed decision-making

The Workshop will consider all scopes of PSA for nuclear power plants and other nuclear
installations, the associated safety issues and the diverse decisions made by stakeholders
including licensees and regulatory bodies. The dynamic PSA decision-making cases to be
identified may be defined for any of these scopes or parts thereof, including Level 1/2/3 PSA,
any plant operational modes, internal events, internal and external hazards, as well as diverse
specific concerns such as spent fuel pools, equipment recovery, portable equipment
deployment, accident management, and site-level risk.

Format
The Workshop will include plenary and technical sessions in addition to a facilitated wrap-up
session. Active participation of the workshop attendees in the discussions as well as in theformulation of conclusions and recommendations will be highly appreciated. Information
obtained as a result of the Workshop will provide a better understanding and improved
interpretation of subjects, topics, and issues related to the use of dynamic PSA in risk-informed
decision-making for nuclear installations.
A WGRISK report (Workshop Proceedings with summarized results and conclusions, as well
as recommendations for follow-on activities) will be prepared on the basis of the information
presented and discussed during the Workshop.
The Workshop will be an in-person event only; no virtual participation is foreseen.

Participation in the Workshop and Logistics
Participants
The organizers kindly invite experts from industry, regulatory authorities, technical support
organizations (TSOs) and research institutes, safety analysis practitioners and consultants
involved in the probabilistic safety assessment of nuclear installations or the associateddecision-making from the OECD member countries, the NEA member countries, and NEA
strategic partners, invitees, and partner international organizations to contribute and participate.

Registration
Registration is required for all participants. To support effective planning, please register early,
but at latest by the deadline 27th October 2023. Please register using the Registration Formon the WS event page.

3

Presentations
Participants intending to present a contribution related to the workshop topics are requested
to submit an abstract (between 300 and 500 words) that provides a brief overview of thecontent of their proposed presentation. All abstracts should be submitted by 30st June 2023;
see the submission form on the DPSA WS event page. The Organizing Committee will review
abstracts and notify the authors by 17th July 2023 on the acceptance of the presentations.
Presenters will be asked to upload their presentations prior to the workshop – instructions will
be available at the event website.

Registration FeeThe Workshop is free of charge for all participants. Accommodation and travel will not beprovided and must be organised by the participants.

Language
All presentations and discussions will be in English; translation will not be provided.

Workshop Location
The Workshop will be hosted by the U.S. NRC at its Headquarters in Rockville, MD, USA.
Rockville is in the Washington DC metropolitan area and the venue is easily accessible bypublic transport.

Venue Address:
U.S. Nuclear Regulatory Commission
11555 Rockville Pike
Rockville, MD 20852
USA

For practical travel information (how to get there, accommodation options); see the DPSA
WS event page.

Workshop Contacts
NEA Secretariat:
Yuji Kumagai
E-mail: Yuji.Kumagai@oecd-nea.org

4Workshop Organizing Committee
Michelle GONZALEZ (Chair)

U.S. NRC

USA

Tanja ERAERDS (Co-Chair)

GRS

GermanyVinh DANGPSISwitzerland

Mehdi Reisi Fard

U.S. NRC

USAYuji KUMAGAI (NEA)

OECD NEA

FranceKey Dates and Deadlines
Deadline for Abstract Submission

June 30, 2023

Notification of Accepted Presentations

July 17, 2023

Deadline for Attendance Registration

October 27, 2023

Deadline for Presentation Submission

October 27, 2023

The workshop

November 16-17, 2023

Please refer to the Dynamic PSA WS event page forGuidelines for the abstracts and instructions for their submission
How to register and practical information for participants

and the latest information and updates on the workshop.

Workshop Proceedings
The Task Report from the Workshop will be published by the OECD NEA and will include
objectives and important comments provided during the Workshop, all Workshop
presentations, summaries, conclusions and recommendations made during thediscussions, concluding remarks as well as new or emerging areas of interest identified
in the final closing session. A specific part of the report will be dedicated to the discussionof experiences.