Chair(s): |
Timothy E. VALENTINE, United States |
Secretary: |
Oliver BUSS (oliver.buss@oecd-nea.org) |
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Vice-Chair(s): |
Evgeny IVANOV, France | ||
Member(s): | All NEA member countries* | ||
Russia (Suspended*) | |||
*Russian Federation suspended pursuant to a decision of the OECD Council. | |||
EU participation: |
The European Union (EU) takes part in the work of the NEA, in accordance with the NEA Statute and the Supplementary Protocol to the Convention on the Organisation for Economic Co-operation and Development. | ||
Observer(s)(International Organisation): |
International Atomic Energy Agency (IAEA) By agreement | ||
Date of creation: | 01 April 2021 | ||
End of mandate: | 31 March 2026 |
Mandate (Document reference):
Mandate (Document extract):
Extract from document [NEA/NSC/WPRS(2024)3]
Background
As a result of the prioritisation process, a reorganisation of the Nuclear Science Committee (NSC) activities was performed in 2020/2021 under the guidance of the NSC Bureau. This has resulted in the disbandment of the NSC Expert Group on Multi-Physics Experimental Data, Benchmarks and Validation (EGMPEBV), the Expert Group on Radiation Transport and Shielding (EGRTS), the Expert Group on Reactor Physics and Advanced Nuclear Systems (EGRPANS) and the Expert Group on Uncertainty Analysis in Modelling (EGUAM). Two new bodies have been created to replace them: the Expert Group on Physics of Reactor Systems (EGPRS) and the Expert Group on Reactor Systems Multi-Physics (EGMUP).
Scope
Under the guidance of the Working Party on Scientific Issues and Uncertainty Analysis of Reactor Systems (WPRS), the Expert Group on Reactor Systems Multi-Physics (EGMUP) will advance the state-of the-art in establishing processes and procedures for certifying experimental data and benchmarking multi-physics multi-scale modelling and simulation (M&S). EGMUP will also evaluate the performance of novel artificial intelligence (AI) and machine learning (ML) applications in multi-physics M&S of reactor systems.
Coupled behaviours of two or more of the following physics will include, but are not limited to the following:
The single- and few-physics modules collected in a multi-physics model should be based on the best-estimate models. They might be as precise (or high-fidelity) as derived from fully mechanistic tools using a kind of Hi2Lo techniques.
Multi-physics aspects of both steady-state and transient conditions of existing and advanced nuclear systems will be examined along with uncertainty quantification and direct (forward)- and backward- propagation through different scale (multi-scale M&S) and different physics phenomena (multi-physics M&S).
Reactor types considered include, but are not limited to the following:
Objectives
The EGMUP will provide recommendations to the WPRS and the nuclear community on the scientific development needs (data and methods, validation experiments, scenario studies) for multi-physics and multi-scale M&S, including sensitivity and uncertainty methodology for analysis of different reactor systems and scenarios.
Guidance and protocols to qualify experimental-based benchmarks for multi-physics and multi-scale M&S, and to make use of the objective observations and integral experiments in the validation process will be developed and periodically updated.
To fulfil the above the expert group will provide the following:
To support its activities, the group will collect and evaluate multi-physics data from available integral facilities and Nuclear Power Plant (NPP) experimental data. Analytical and numerical benchmarking will also be used to fulfil the objectives.
Working Methods
The EGMUP will report to the WPRS. The EGMUP will meet once per year, with additional meetings in support of particular activities, such as task forces of the EGMUP.
EGMUP’s deliverables will be developed in task or benchmark groups, whose work will be organised in a project-like manner with outcomes and milestones.
Interactions
The EGMUP will liaise closely with other relevant NEA bodies, in particular the WPRS Expert Group on Physics of Reactor Systems (EGPRS) and the Expert Group on Reactor Core Thermal-hydraulics and Mechanics (EGTHM) as well as those bodies operating under the guidance of the Nuclear Science Committee (NSC), and the Committee on the Safety of Nuclear Installations (CSNI) and the Committee on Nuclear Regulatory Activities (CNRA). The objective will be to ensure that the respective programmes are complementary and to provide advice and support where required and undertake common work where appropriate. Links with the NSC Working Party on Materials Science Issues in Nuclear Fuels and Structural Materials (WPFM) will assist with issues related to fuel performance and structural materials analysis. Close collaboration with the NSC Working Party on Scientific Issues of Advanced Fuel Cycles (WPFC) and its expert groups will be maintained.
The preservation and management of knowledge specific to the areas of interest will be coordinated through relevant frameworks under the auspices of the OECD-NEA Nuclear Science Committee.
Deliverables
The deliverables of EGMUP are technical reports, proceedings of seminars or workshops, state-of-the-art reports, and technical or collective opinion papers, databases, and comparison or benchmark studies. The EGMUP will also organise specialist meetings and workshops to further its objectives. The detailed list of deliverables will be tracked in the semi-annual NSC progress reports.
Priority for the 2024-2026 period is given to developments, reports, and benchmarks set forth hereunder: