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Communication Dans Un Congrès Année : 2023

METERO-V and PRIUS experimental programs: complementary separate effects tests for core mixing validation

Résumé

The analysis of Large Break-Loss of Coolant Accidents (LB-LOCAs) required specific experimental programs to investigate large-scale 3D effects, particularly during downcomer refill and core reflooding. SB-LOCAs (Small Break) and IB-LOCAs (Intermediate Break) also encounter significant 3D effects in core due to the radial power profile, with crossflows and diffusion-dispersion. Other transients such as steam line break are sensitive to all mixing phenomena in the core. Then a need exists for a more precise validation of each of the mixing processes, including turbulent terms, 3D interfacial friction and wall friction. In order to provide experimental data to validate thermal hydraulic codes for PWR core in transient situations, two experimental programs are being carried out at CEA and KAERI. At CEA, METERO-V experimental program mainly focuses on LOCAs, and SLB (Steam Line Break) accidents are also considered. These situations, where significant 3D effects may occur in the core, are reproduced in an 834 rod-bundle test section with the aim to develop models and to validate them in a separated-effect way for CFD to system thermal-hydraulic scales. At KAERI, a test facility called PRIUS-II (in-PWR Rod-bundle Investigation of Undeveloped mixing flow across Sub-channel) is devoted to generate an experimental database for a multi-dimensional flow distribution using the MIR technique in a 612 rod-bundle geometry, in LOCAs situations. It is useful for component scale analysis codes and CFD codes in open medium validation. METERO-V and PRIUS-II experiments are complementary in terms of geometry and range of Reynolds numbers, and the data allows separate-effect validation of all codes which may be used for core thermal hydraulic simulations including system codes, sub-channel codes, and CFD codes. New data could be generated in additional single-phase conditions (METERO-V, PRIUS) or two-phase conditions (METERO-V) and could be provided to participants of an international project.
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Dates et versions

cea-04371973 , version 1 (04-01-2024)

Identifiants

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Philippe Fillion, Seok Kim, Clément Melin, Gilles Bernard-Michel, Benjamin Cariteau, et al.. METERO-V and PRIUS experimental programs: complementary separate effects tests for core mixing validation. NURETH-20 - 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Aug 2023, Washington DC, United States. pp.1848-1861, ⟨10.13182/NURETH20-41365⟩. ⟨cea-04371973⟩
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