Multi-physics and Multi-Scale Benchmarking and Uncertainty Quantification within NEA/OECD Framework
The development of multi-physics multi-scale coupled methodologies for Light Water Reactor (LWR) analysis requires comprehensive validation and verification procedures, which include well-established benchmarks developed in international cooperation.
The Nuclear Energy Agency (NEA) of the Organization for Economic Cooperation and Development (OECD) has provided such framework, and over the years a number of LWR benchmarks have been developed and successfully conducted. The latest set of NEA/OECD benchmarks have been initiated by the Expert Group on Uncertainty Analysis in Modeling (EGUAM) at the Nuclear Science Committee (NSC) to address the current trends in the development of LWR multi-physics and multi-scale modeling and simulation.
These benchmarks include the following common features:
- a) Utilization of high-quality experimental data;
- b) Refined local scale modeling in addition to global predictions;
- c) More detailed comparisons and analysis;
- d) Including uncertainty and sensitivity analysis of modeling predictions.
While the presentation will discuss some of these new benchmarks by providing some description and discussion of obtained results the major focus will be on the OECD LWR Uncertainty Analysis in Modeling (UAM) benchmark. In this benchmark activity a special attention is devoted to uncertainty propagation in LWR multi-physics and multi-scale simulations for design and safety evaluations.