Auswahl der wissenschaftlichen Literatur zum Thema „Lit de débris (génie nucléaire)“
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Dissertationen zum Thema "Lit de débris (génie nucléaire)"
Tréol, Cyriaque. „Vers une modélisation du comportement d'un lit de débris sur le récupérateur de corium d'un RNR-Na“. Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST016.
Der volle Inhalt der QuelleThis thesis concerns severe accidents in a Sodium-cooled Fast Reactor (SFR). The term severe accident refers to nuclear accidents involving partial or total melting of the core, which forms a mixture of molten materials known as corium. Such accidents have occurred in the past in nuclear reactors of different types: the Three Mile Island accident in 1979 involving a Pressurised Water Reactor, the Chernobyl accident in 1986 involving an RBMK-type reactor, and the Fukushima accidents in 2011 involving Boiling Water Reactors. Although rare, these disasters are possible. The probability of occurrence and the consequences must be anticipated and reduced as far as possible. These studies present nuclear safety issues. In the study of severe accidents in nuclear reactors, a major problem is the cooling of the corium when it is in the form of bed of resolidified particles called the debris bed. The majority of models treat this debris bed as an immobile porous medium. But these debris are not bonded and they are able to move under the influence of sodium flows. This thesis focuses specifically on the study of these movements, which lead to the self-leveling of the initially conical debris bed. A theoretical macroscopic multiphase flow model with heat source term and phase change including a mobile particulate solid phase is proposed. This model is then partially implemented in the OpenFOAM open source C++ computational platform and verified
Clavier, Rémi. „Étude expérimentale et modélisation des pertes de pression lors du renoyage d’un lit de débris“. Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0124/document.
Der volle Inhalt der QuelleThis work deals with single and two-phase flow pressure losses in porous media. The aim is to improve understanding and modeling of momentum transfer inside particle beds, in relation with nuclear safety issues concerning the reflooding of debris beds during severe nuclear accidents. Indeed, the degradation of the core during such accidents can lead to the collapse of the fuel assemblies, and to the formation of a debris bed, which can be described as a hot porous medium. This thesis is included in a nuclear safety research project on coolability of debris beds during reflooding sequences. An experimental study of single and two-phase cold-flow pressure losses in particle beds is proposed. The geometrical characteristics of the debris and the hydrodynamic conditions are representative of the real case, in terms of granulometry, particle shapes, and flow velocities. The new data constitute an important contribution. In particular, they contain pressure losses and void fraction measurements in two-phase air-water flows with non-zero liquid Reynolds numbers, which did not exist before. Predictive models for pressure losses in single and two-phase flow through particle beds have been established from experimental data. Their structures are based on macroscopic equations obtained from the volume averaging of local conservation equations. Single-phase flow pressure losses can be described by a Darcy-Forchheimer law with a quadratic correction, in terms of filtration velocity, with a better-than-10 % precision. Numerical study of single-phase flows through porous media shows that this correlation is valid for disordered smooth particle beds. Twophase flow pressure losses are described using a generalized Darcy-Forchheimer structure, involving inertial and cross flow terms. A new model is proposed and compared to the experimental data and to the usual models used in severe accident simulation codes
Le, Maout-Alvarez Coralie. „Étude expérimentale des effets chimiques sur le colmatage des filtres dans l’industrie nucléaire“. Electronic Thesis or Diss., Université de Lorraine, 2023. http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2023_0015_ALVAREZ.pdf.
Der volle Inhalt der QuelleDuring a LOCA accident (Loss Of Coolant Accident) occurring to a nuclear Pressurized Water Reactor (PWR), debris are generated and can be partially transported to the RIS-EAS filter in the sumps located in the bottom of the nuclear reactor containment. These debris can contribute to the « physical » clogging of the filters. Another effect called « chemical effects » corresponds to the presence of cations in solution resulting from the debris' corrosion and the possible corrosion of the metal surface present in the reactor containment vessel. In the case of a severe accident with core fuel meltdown, additional loads debris are to be considered as presence of particles formed of structural materials, control rod material, fission products and concrete particles resulting from corium-concrete interaction. To ensure the long term liquid recirculation functionality, the chemical effect have to be understood: nature of these chemical effects, conditioning parameters and potential effect on the clogging. The thesis aims at studying the chemical effects after designing a dedicated experimental loop: a parametric approach , coupled with several chemical and pressure drop measurements. Chemical speciation in solution and precipitate characterizations will/can be respectively performed by ICP and MEB-EDX, DRX and XPS techniques
Petit, François. „Ébullition en milieu poreux et renoyage d'un lit de débris de réacteur nucléaire“. Paris, ENSAM, 1998. http://www.theses.fr/1998ENAM0015.
Der volle Inhalt der QuelleVanni, Florence. „Etude du procédé de CVD en lit fluidisé en vue de revêtir des particules denses pour applications nucléaires“. Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14413/1/vanni.pdf.
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