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Communication Dans Un Congrès Année : 2019

Development of the CATHARE 3 three-field model for simulations in large diameter horizontal pipes

Résumé

During hypothetical Loss of coolant accident in a PWR caused by a large break in the primary circuit, the reactor core is uncovered. Emergency core cooling is then activated and the accident enters the reflooding phase. Complex two phase flows and heat transfer phenomena occur during this phase and their analysis request detailed models, included in system codes such as CATHARE. A three-field model has been previously implemented in CATHARE 3 and applied to reflooding calculations in the core. This paper aims to describe the extension of this three-field model to the primary circuit, especially for hot legs, in order to improve the simulation of liquid droplet transport from the core to the steam generators. For vertical flows, such as in the core, a comparison of correlations for the entrainment and deposition terms against steam-water data series allowed to select a model for the film-droplets mass exchange. These correlations established for vertical flows are not applicable in horizontal geometries with large diameters such as the hot legs where, during the reflooding phase, the flow regime is dispersed or stratified with entrained droplets. In this case, a specific deposition term based on a model developed from air-water experiments, accounting gravity and turbulent diffusion mechanisms, is used. Dedicated correlations for the entrainment rate and the droplet diameter complete the package of closure laws. These models are assessed against experimental data obtained in horizontal pipes with various diameters and with various inlet gas and liquid superficial velocities.
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Dates et versions

cea-04382534 , version 1 (09-01-2024)

Identifiants

  • HAL Id : cea-04382534 , version 1

Citer

Philippe Fillion. Development of the CATHARE 3 three-field model for simulations in large diameter horizontal pipes. NURETH 2019 - 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Aug 2019, Portland, United States. pp.6271-6282. ⟨cea-04382534⟩
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