NEA Mandates and Structures
Expert Group on Multi-physics Experimental Data, Benchmarks and Validation (EGMPEBV)
Timothy E. VALENTINE, United States
|Member(s):||All NEA member countries|
Under the NEA Statute
International Atomic Energy Agency (IAEA)|
|Date of creation:||30 June 2014|
|End of mandate:||30 June 2018|
Mandate (Document reference):
- Agreed at the 25th meeting of the Nuclear Science Committee [NEA/SEN/NSC(2014)2]
- Modified (election of the Chair) at the 26th meeting of the Nuclear Science Committee [NEA/SEN/NSC(2015)2]
- Extended and revised at the 27th meeting of the Nuclear Science Committee in June 2016 [NEA/SEN/NSC(2016)2]
- Extension procedure ongoing
- Mandate being reviewed ‑ procedure ongoing
Mandate (Document extract):
Extract from document NEA/SEN/NSC(2016)2
The processes for performing experiments, creating benchmarks and standard problems, and using these data to validate computer codes, have been developed and implemented for several decades, with highly satisfactory results for most standard applications. Nevertheless, the global context of nuclear technology development continues to evolve and new challenges to the status quo have been appearing:
- The development of coupled “multi-physics” codes that allow for higher fidelity in the representation of the physical phenomenology and also allow for explicit representations of coupling phenomena. Validation of these new capabilities will require access to data that are representative of the depth of the modeling and of the coupling phenomena.
- Associated with a move to best-estimate methods in safety analyses, there is often a requirement for increased rigor in the validation process, particularly in the estimation of uncertainties.
- The availability of experimental facilities and associated skills capabilities have continued to decline in many countries, resulting both in the potential loss of valuable data and making reproducibility checks and fully independent peer review more difficult. For some applications there is therefore a risk of systematic biases in experimental analyses. Preservation of data with documentation is, therefore, essential.
- A common bank of certified data for clearly defined applications will save resources of vendors and regulators.
Under the guidance of the Nuclear Science Committee, the expert group will deal with the activities associated with the certification of experimental data and benchmark models along with establishing the processes and procedures for using the data and benchmark models for validation of modeling and simulation tools and data.
- To provide member countries with the guidance and processes for certifying experimental data for its use as a benchmark or for uses as general testing of modeling and simulation tools.
- To provide member countries with access to certified experimental data from the contributions of individual member countries.
- To provide member countries with guidance and recommendations for developing benchmark models from certified experimental datasets.
- To provide member countries with access to standardized benchmark models with detailed uncertainty evaluations and uncertainty methodology guidelines.
- To provide member countries with recommendations and guidelines for the range of applicability of the certified experimental datasets.
- To provide member countries with guidelines and consensus recommendations for validating multi-physics simulations.
- To provide member countries with a limited number of demonstrations of the validation recommendations.
Links to other NEA working parties
The expert group will liaise closely with other relevant NEA working parties and expert groups, including those operating under the guidance of the NSC and CSNI, to ensure that the respective programmes are complementary and to provide advice and support where required and undertake common work where appropriate.
- Summary report on the current status of experimental data for multi-physics applications referencing the existing experimental databases under the auspices of the NEA and those under other national and/or international purviews.
- State-of-the-art Report on the current stats of approaches to validation of modeling and simulation tools and data reference existing national and international consensus standards.
- Summary report of the status of experimental facilities in NEA member countries for thermal-hydraulic and fuel performance experiments needed for multi-physics validation.
- Report on the metrics and processes for certifying experimental data intended for use in validation of multi-physics M&S tools and data.
- Report on the metrics and processes for developing benchmark models from certified experimental data.
- Development of a database of evaluated experimental data.
- Development of a database of evaluated benchmark models.
- Report on the guidelines and applicability of certified data and benchmark models for validation of M&S tools and data with application specific examples.