PREMIUM: A Benchmark on the Quantification of the Uncertainty of the Physical Models in the System Thermal-hydraulic Codes. Methodologies and Data Review

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The objective of the Post-BEMUSE Reflood Model Input Uncertainty Methods (PREMIUM) benchmark is to progress on the issue of the quantification of the uncertainty of the physical models in system thermal-hydraulic codes by considering a concrete case: the physical models involved in the prediction of core reflooding.

The introduction includes first a chapter devoted to contextualisation of the benchmark in nuclear safety research and licensing, followed by a description of the PREMIUM objectives. Next, a description of the Phases in which the benchmark is divided and its organisation is explained.

Chapter 2 consists of a review of the involvement of the different participants, making a brief explanation of the input uncertainty quantification methodologies used in the activity.

The document ends with some conclusions on the development of Phase I, general remarks and statements on the benefits of the benchmark.

Appendixes include the complete description of the experimental data FEBA/SEFLEX used in the benchmark and the methodologies CIRCÉ and FFTBM and the general requirements and description specification used for Phase I. Due to the revision of the document, four extra appendixes have been added related to the methods developed during the activity, MCDA DIPE, Tractebel IUQ and PSI methods.