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14 results on '"Garitta, S."'

1. Operating a full tungsten actively cooled tokamak: overview of WEST first phase of operation

Author

Bucalossi, J., Achard, J., Agullo, O., Alarcon, T., Allegretti, L., Ancher, H., Antar, G., Antusch, S., Anzallo, V., Arnas, C., Arranger, D., Artaud, J. F., Aumeunier, M. H., Baek, S. G., Bai, X., Balbin, J., Balorin, C., Barbui, T., Barbuti, A., Barlerin, J., Basiuk, V., Batal, T., Baulaigue, O., Bec, A., Bécoulet, M., Benoit, E., Benard, E., Benard, J. M., Bertelli, N., Bertrand, E., Beyer, P., Bielecki, J., Bienvenu, P., Bisson, R., Bobkov, V., Bodner, G., Bottereau, C., Bouchand, C., Bouquey, F., Bourdelle, C., Bourg, J., Brezinsek, S., Brochard, F., Brun, C., Bruno, V., Bufferand, H., Bureau, A., Burles, S., Camenen, Y., Cantone, B., Caprin, E., Carpentier, S., Caulier, G., Chanet, N., Chellai, O., Chen, Y., Chernyshova, M., Chmielewski, P., Choe, W., Chomiczewska, A., Ciraolo, G., Clairet, F., Coenen, J., Colas, L., Colledani, G., Colnel, J., Coquillat, P., Corbel, E., Corre, Y., Costea, S., Courtois, X., Czarski, T., Daniel, R., Daumas, J., De Combarieu, M., Temmerman, G., De, De Vries, P., Dechelle, C., Deguara, F., Dejarnac, R., Delaplanche, J. M., Delgado-Aparicio, L. F., Delmas, E., Delpech, L., Desgranges, C., Devynck, P., Di Genova, S., Diab, R., Diallo, A., Diez, M., Dif-Pradalier, G., Dimitrova, M., Ding, B., Dittmar, T., Doceul, L., Domenes, M., Douai, D., Dougnac, H., Duan, X., Dubus, L., Dumas, N., Dumont, R., Durand, F., Durif, A., Durocher, A., Durodié, F., Ekedahl, A., Elbeze, D., Ertmer, S., Escarguel, A., Escourbiac, F., Ezato, K., Faisse, F., Faure, N., Fedorczak, N., Fejoz, P., Fenzi-Bonizec, C., Ferlay, F., Firdaouss, M., Fleury, L., Flouquet, D., Gallo, A., Gao, Y., Garbet, X., Garcia, J., Gardarein, J. L., Gargiulo, L., Garibaldi, P., Garitta, S., Gaspar, J., Gauthier, E., Gavila, P., Gazzotti, S., Gely, F., Geynet, M., Gharafi, S., Ghendrih, P., Giacalone, I., Gil, C., Ginoux, S., Girard, S., Giroux, E., Giruzzi, G., Goletto, C., Goniche, M., Gray, T., Grelier, E., Greuner, H., Grigore, E., Grisolia, C., Grosjean, A., Grosman, A., Guibert, D., Guilhem, D., Guillemaut, C., Guillermin, B., Guirlet, R., Gunn, J. P., Gunsu, Y., Gyergyek, T., Hakola, A., Harris, J., Hatchressian, J. C., Helou, W., Hennequin, P., Hernandez, C., Hill, K., Hillairet, J., Hirai, T., Hoang, G. T., Houry, M., Hutter, T., Imbeaux, F., Imbert, N., Ivanova-Stanik, I., Jalageas, R., Jardin, A., Jaubert, L., Jiolat, G., Jonas, A., Joubert, P., Kirschner, A., Klepper, C., Komm, M., Koubiti, M., Kovacic, J., Kozeiha, M., Krieger, K., Krol, K., Lacroix, B., Laguardia, L., Lamaison, V., Laqua, H., Lau, C., Lausenaz, Y., Lé, R., Le Bohec, M., Lefevre, N., Lemoine, N., Lerche, E., Lewerentz, M., Li, Y., Li, M., Liang, A., Linczuk, P., Linsmeier, C., Lipa, M., Litaudon, X., Liu, X., Llorens, J., Loarer, T., Loarte, A., Loewenhoff, T., Lombard, G., Lore, J., Lorenzetto, P., Lotte, P., Lozano, M., Lu, B., Lunsford, R., Luo, G., Magaud, P., Maget, P., Mahieu, J. F., Maini, P., Malard, P., Malinowski, K., Manas, P., Manenc, L., Marandet, Y., Marechal, J. L., Marek, S., Martin, C., Martin, E., Martinez, A., Martino, P., Mazon, D., Messina, P., Meunier, L., Midou, D., Mineo, Y., Missilian, M., Mitteau, R., Mitu, B., Mollard, P., Moncada, V., Mondiere, T., Morales, J., Moreau, M., Moreau, P., Moudden, Y., Moureau, G., Mouyon, D., Muraglia, M., Nagy, A., Nakano, T., Nardon, E., Neff, A., Nespoli, F., Nichols, J., Nicollet, S., Nouailletas, R., Ono, M., Ostuni, V., Parish, C., Park, H., Parrat, H., Pascal, J. Y., Pégourié, B., Pellissier, F. P., Peneliau, Y., Peret, M., Peysson, Y., Pignoly, E., Pintsuk, G., Pitts, R., Pocheau, C., Portafaix, C., Poulos, M., Prochet, P., Puig Sitjes, A., Rasinski, M., Raup, G., Regal-Mezin, X., Reux, C., Riccardi, B., Rice, J., Richou, M., Rigollet, F., Roche, H., Romazanov, J., Ruset, C., Sabot, R., Saille, A., Sakamoto, R., Salmon, T., Samaille, F., Santagiustina, A., Santraine, B., Sarazin, Y., Serre, E., Shin, H., Shiraiwai, S., Signoret, Ja., Signoret, Je., Simonin, A., Skalli Fettachi, O., Song, Y., Spring, A., Spuig, P., Sridhar, S., Stratton, B., Talatizi, C., Tamain, P., Tatali, R., Téna, M., Torre, A., Toulouse, L., Travère, J. M., Treutterer, W., Tsitrone, E., Unterberg, E., Urbanczyk, G., Van Eester, D., Van Rooij, G., Vartanian, S., Verger, J. M., Vermare, L., Vézinet, D., Vignal, N., Vincent, B., Vives, S., Volpe, D., Wallace, G., Wang, E., Wang, L., Wang, Yi., Wang, Yo., Wauters, T., Wirth, B., Wirtz, M., Wojenski, A., Wright, J., Xu, M., Yang, Q., Yang, H., Zago, B., Zagorski, Zhang, B., Zhang, X., Zou, X., Institut universitaire des systèmes thermiques industriels (IUSTI), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique des Plasmas (LPP), Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Tokamak, Materials science, WEST, Nuclear engineering, Phase (waves), chemistry.chemical_element, Tungsten, law.invention, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], law, ITER, divertor, DEMO, Engineering & allied operations, nuclear fusion, Superconductivity, [PHYS]Physics [physics], Divertor, RF power amplifier, magnetic confinement, Plasma, Condensed Matter Physics, chemistry, Heat flux, ddc:620, tokamak physics
Abstract

WEST is an MA class superconducting, actively cooled, full tungsten (W) tokamak, designed to operate in long pulses up to 1000 s. In support of ITER operation and DEMO conceptual activities, key missions of WEST are: (i) qualification of high heat flux plasma-facing components in integrating both technological and physics aspects in relevant heat and particle exhaust conditions, particularly for the tungsten monoblocks foreseen in ITER divertor; (ii) integrated steady-state operation at high confinement, with a focus on power exhaust issues. During the phase 1 of operation (2017–2020), a set of actively cooled ITER-grade plasma facing unit prototypes was integrated into the inertially cooled W coated startup lower divertor. Up to 8.8 MW of RF power has been coupled to the plasma and divertor heat flux of up to 6 MW m−2 were reached. Long pulse operation was started, using the upper actively cooled divertor, with a discharge of about 1 min achieved. This paper gives an overview of the results achieved in phase 1. Perspectives for phase 2, operating with the full capability of the device with the complete ITER-grade actively cooled lower divertor, are also described.

Published
2022

2. Hydraulic analysis of EU-DEMO divertor plasma facing components cooling circuit under nominal operating scenarios.

Author

Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., and Vallone, E.

Subjects
*THERMAL hydraulics, *SWIRLING flow, *FINITE volume method, *COOLING, *COOLANTS
Abstract

• Investigation of the steady-state thermal-hydraulic behaviour of the DEMO divertor PFCs cooling circuit. • Analysis of a realistic model adopting a Computational Fluid-Dynamic approach basedon Finite Volume Method. • Assessment of the PFCs cooling circuit thermal-hydraulic performances under both nominal and alternative operative conditions. • Evaluation of the major thermal-hydraulic parameters. Within the framework of the Work Package DIV 1 – "Divertor Cassette Design and Integration" of the EUROfusion action, a research campaign has been jointly carried out by University of Palermo and ENEA to investigate the steady state thermal-hydraulic behaviour of the DEMO divertor cassette cooling circuit, focussing the attention on its Plasma Facing Components (PFCs). The research campaign has been carried out following a theoretical-computational approach based on the Finite Volume Method and adopting the commercial Computational Fluid-Dynamic code ANSYS-CFX. A realistic model of the PFCs cooling circuit has been analysed, specifically embedding each Plasma Facing Unit (PFU) cooling channel with the foreseen swirl tape turbulence promoter, hence resulting in a finite volume model much more detailed than those assessed in previous analyses. Its thermal-hydraulic performances have been numerically evaluated under nominal steady state conditions, also comparing the obtained results with the corresponding outcomes of analogous analyses carried out for a simplified PFCs configuration, without swirl tapes. Moreover, the main thermal-hydraulic parameters have been evaluated in order to check whether the considered PFCs cooling circuit might fulfil the total pressure drop requirement (Δp <1.4 MPa), providing a uniform cooling of the Vertical Target PFU channels with a viable CHF margin (>1.4). The PFCs cooling circuit thermal-hydraulic behaviour has been additionally assessed at alternative operative conditions, issued to check the viability of a coolant velocity reduction, in order to minimize corrosion and vibrations inside the PFU channels. Models, loads and boundary conditions assumed for the analyses are herewith reported and critically discussed, together with the main results obtained. [ABSTRACT FROM AUTHOR]

Published
2019
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3. Thermal-hydraulic optimisation of the DEMO divertor cassette body cooling circuit equipped with a liner.

Author

Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., and Vallone, E.

Subjects
*FINITE volume method, *FLOW velocity, *COOLANTS, *WATER temperature, *VACUUM pumps, *TOROIDAL magnetic circuits
Abstract

• Estimation of major criticalities in the CB thermal-hydraulic performances. • Adoption of a theoretical approach based on a lumped parameter 1D model. • Assessment of several CB configurations thermal-hydraulic performances. • Identification of the most promising CB layout configuration to be further improved. Within the framework of the Work Package DIV 1 - "Divertor Cassette Design and Integration" of the EUROfusion action, a research campaign has been jointly carried out by University of Palermo and ENEA to investigate the thermal-hydraulic performances of the DEMO divertor cassette cooling system. The research activity has been focused onto the most recent design of the Cassette Body (CB) cooling circuit equipped with a Liner, whose main function is to protect the underlying vacuum pump hole from the radiation arising from the plasma. The research campaign has been carried out following a theoretical-computational approach based on the Finite Volume Method and adopting the commercial Computational Fluid-Dynamic code ANSYS-CFX. The CB thermal-hydraulic performances have been assessed in terms of coolant and structure temperature, coolant overall pressure drop, flow velocity distribution and mass flow rate fed to the Liner cooling circuit, mainly in order to check coolant aptitude to provide a uniform and effective cooling to both CB and Liner structures. The outcomes of the study have shown some major criticalities, mainly in terms of water coolant vaporization as well as non-symmetric coolant distribution between the two Liner inlets. As a consequence, the following potential solutions have been successfully explored in order to allow the CB to safely operate while complying with its design constraints: • revising the CB design layout in order to increase the coolant mass flow rate fed to Liner; • increasing coolant inlet pressure to rise water saturation temperature and, hence, its margin against vaporization; • increasing coolant mass flow rate to reduce its overall thermal rise. The main results and the achieved optimized model are herewith described and critically discussed. [ABSTRACT FROM AUTHOR]

Published
2019
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4. Computational thermofluid-dynamic analysis of DEMO divertor cassette body cooling circuit.

Author

Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., Marino, M., and Vallone, E.

Subjects
*FUSION reactor divertors, *FINITE volume method, *THERMAL hydraulics, *STEEL, *PRESSURE drop (Fluid dynamics), *COMPUTATIONAL fluid dynamics, *FLUID-structure interaction
Abstract

Highlights • The thermal-hydraulic performances of the DEMO divertor Cassette Body cooling circuit have been investigated. • A numerical approach based on the Finite Volume Method has been followed, adopting the ANSYS-CFX code. • Cooling circuit is generally able to provide a uniform cooling to steel structure with a total pressure drop of 0.1 MPa. • Limited hot spots have been found in the steel structure to be further investigated. Abstract Within the framework of the Work Package Divertor, Subproject: Cassette Design and Integration (WPDIV-Cassette) of the EUROfusion action, a research campaign has been jointly carried out by ENEA and University of Palermo to investigate the thermal-hydraulic performances of the DEMO divertor cassette cooling system. The research activity has been carried out following a theoretical-computational approach based on the finite volume method and adopting a qualified Computational Fluid-Dynamic (CFD) code. Fully-coupled fluid-structure CFD analyses have been carried out for the recently-revised cassette body cooling circuit under nominal steady state conditions, imposing a non-uniform spatial distribution of nuclear-deposited heat power volumetric density drawn from the most recent neutron transport analysis. The pertaining thermal-hydraulic performances have been assessed in terms of coolant flow velocity and total pressure distributions as well as of coolant and structure temperature distributions to check whether they comply with the corresponding prescribed limits. Results obtained are reported and critically discussed. [ABSTRACT FROM AUTHOR]

Published
2018
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5. On the thermal-hydraulic optimization of DEMO divertor plasma facing components cooling circuit.

Author

Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., Marino, M., and Vallone, E.

Subjects
*THERMAL hydraulics, *FUSION reactor divertors, *PLASMA flow, *FINITE volume method, *ELECTRIC circuits, *COOLING
Abstract

Highlights • The thermal-hydraulic performances of the DEMO divertor Plasma Facing Components (PFCs) cooling circuit have been optimized. • The effects of increasing inlet/outlet manifolds diameters and placing a diffuser at the inlet of each Vertical Target have been assessed. • A numerical approach based on the Finite Volume Method has been followed, adopting the ANSYS-CFX code. • The "optimized" configuration foresees a total pressure drop of 1.098 MPa and a minimum margin against CHF occurrence of 1.462. Abstract Within the framework of the Work Package Divertor, Subproject: Cassette Design and Integration (WPDIV-Cassette) of the EUROfusion action, a research campaign has been jointly carried out by ENEA and University of Palermo to investigate the thermal-hydraulic performances of the DEMO divertor cassette cooling system. Attention has been focussed on the divertor Plasma Facing Components (PFCs) cooling circuit and a parametric analysis has been carried out in order to assess the potential impact of proper layout changes on its thermal-hydraulic performances, mainly in terms of coolant total pressure drop, flow velocity distribution and margin against critical heat flux occurrence. The research activity has been carried out following a theoretical-computational approach based on the finite volume method and adopting a qualified Computational Fluid-Dynamic (CFD) code. Results obtained have allowed to select a revised PFCs cooling circuit configuration, suitable to comply with the prescribed thermal-hydraulic limits assumed for the DEMO divertor design. They are reported and critically discussed. [ABSTRACT FROM AUTHOR]

Published
2018
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6. Thermal-hydraulic behaviour of the DEMO divertor plasma facing components cooling circuit.

Author

Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., and Vallone, E.

Subjects
*THERMAL hydraulics, *FLUID dynamics, *COOLING systems, *FUSION reactor divertors, UNIVERSITY of Palermo (Palermo, Italy)
Abstract

Within the framework of the Work Package DIV 1 – “Divertor Cassette Design and Integration” of the EUROfusion action, a research campaign has been jointly carried out by ENEA and University of Palermo to investigate the thermal-hydraulic performances of the DEMO divertor cassette cooling system. A comparative evaluation study has been performed considering three different options for the cooling circuit layout of the divertor Plasma Facing Components (PFCs). The potential improvement in the thermal-hydraulic performance of the cooling system, to be achieved by modifying cooling circuit layout, has been also assessed and discussed in terms of optimization strategy. The research activity has been carried out following a theoretical-computational approach based on the finite volume method and adopting a qualified Computational Fluid-Dynamic (CFD) code. Results obtained are reported and critically discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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7. Analysis of steady state thermal-hydraulic behaviour of the DEMO divertor cassette body cooling circuit.

Author

Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., and Vallone, E.

Subjects
*DIVERTERS (Electronics), *ATP-binding cassette transporter genetics, *FINITE volume method, *COOLANTS, *THERMAL hydraulics
Abstract

Within the framework of the Work Package DIV 1 – “Divertor Cassette Design and Integration” of the EUROfusion action, a research campaign has been jointly carried out by ENEA and University of Palermo to investigate the thermal-hydraulic performances of the DEMO divertor cassette cooling system. A comparative evaluation study has been performed considering the two different options under consideration for the divertor cassette body coolant, namely subcooled pressurized water and helium. The research activity has been carried out following a theoretical-computational approach based on the finite volume method and adopting a qualified Computational Fluid-Dynamic (CFD) code. CFD analyses have been carried out for the considered options of cassette body cooling circuit under nominal steady state conditions and the pertaining thermal-hydraulic performances have been assessed in terms of overall coolant thermal rise, coolant total pressure drop, flow velocity and pumping power, to check whether they comply with the corresponding limits. Results obtained are reported and critically discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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8. Hydraulic analysis of EU-DEMO divertor plasma facing components cooling circuit under nominal operating scenarios

Author

E. Vallone, S. Garitta, P.A. Di Maio, J.-H. You, G. Mazzone, Di Maio, P. A., Garitta, S., You, J. H., Mazzone, G., Vallone, E., Di Maio P.A., Garitta S., You J.H., Mazzone G., and Vallone E.

Subjects
Nuclear engineering, CFD analysis, DEMO, Divertor, Plasma facing components, Thermofluid-dynamics, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, 0103 physical sciences, General Materials Science, Boundary value problem, CFD analysi, Total pressure, 010306 general physics, Settore ING-IND/19 - Impianti Nucleari, Civil and Structural Engineering, Finite volume method, Steady state, Turbulence, Mechanical Engineering, Plasma facing component, Coolant, Vibration, Nuclear Energy and Engineering, Environmental science
Abstract

Within the framework of the Work Package DIV 1 – “Divertor Cassette Design and Integration” of the EUROfusion action, a research campaign has been jointly carried out by University of Palermo and ENEA to investigate the steady state thermal-hydraulic behaviour of the DEMO divertor cassette cooling circuit, focussing the attention on its Plasma Facing Components (PFCs). The research campaign has been carried out following a theoretical-computational approach based on the Finite Volume Method and adopting the commercial Computational Fluid-Dynamic code ANSYS-CFX. A realistic model of the PFCs cooling circuit has been analysed, specifically embedding each Plasma Facing Unit (PFU) cooling channel with the foreseen swirl tape turbulence promoter, hence resulting in a finite volume model much more detailed than those assessed in previous analyses. Its thermal-hydraulic performances have been numerically evaluated under nominal steady state conditions, also comparing the obtained results with the corresponding outcomes of analogous analyses carried out for a simplified PFCs configuration, without swirl tapes. Moreover, the main thermal-hydraulic parameters have been evaluated in order to check whether the considered PFCs cooling circuit might fulfil the total pressure drop requirement (Δp 1.4). The PFCs cooling circuit thermal-hydraulic behaviour has been additionally assessed at alternative operative conditions, issued to check the viability of a coolant velocity reduction, in order to minimize corrosion and vibrations inside the PFU channels. Models, loads and boundary conditions assumed for the analyses are herewith reported and critically discussed, together with the main results obtained.

Published
2019

9. Structural verification and manufacturing procedures of the cooling system, for DEMO divertor target (OVT)

Author

G. Mazzone, G. Di Gironimo, V. Imbriani, D. Coccorese, U. Bonavolonta, D. Marzullo, S. Garitta, J.-H. You, V. Cerri, E. Vallone, P.A. Di Maio, A. Tincani, Mazzone, G., You, J. -H., Cerri, V., Coccorese, D., Garitta, S., Di Gironimo, G., Marzullo, D., Di Maio, P. A., Vallone, E., Tincani, A., Bonavolontà, U., Imbriani, V., Bonavolonta, U., Mazzone, G, You, JH, Cerri, V, Coccorese, D, Garitta, S, Di Gironimo, G, Marzullo, D, Di Maio, PA, Vallone, E, Tincani, A, Bonavolonta, U, and Imbriani, V

Subjects
Power station, Computer simulation, Design activities, Divertor target cooling mock-up, Nuclear engineering, Divertor, Mechanical Engineering, Divertor cassette, CAD, Fault (power engineering), 01 natural sciences, 010305 fluids & plasmas, Nuclear Energy and Engineering, 0103 physical sciences, Water cooling, DEMO, Civil and Structural Engineering, Materials Science (all), General Materials Science, Test plan, 010306 general physics, Settore ING-IND/19 - Impianti Nucleari
Abstract

The paper presents the design activities and testing plan of a vertical target mock-up, developed within the pre-conceptual design phase for DEMO Work Package DIV-1 “Divertor Cassette Design and Integration” - EUROfusion Power Plant Physics & Technology (PPPT) program. Activities concerning the Divertor Outboard Vertical Target cooling mock-up are presented in term of CAD model, thermal-hydraulic numerical simulation, structural analysis, structural integrity verification and manufacturing procedure. Moreover, the mechanical dimensions of support systems for Plasma Facing Components (PFCs), manifold and diffuser have been analyzed in detail, in order to avoid structural fault during the test. Test procedures are discussed, taking into account design parameters, design code and facility performances. The CuCrZr alloy selected for the PFCs of EU DEMO divertor has been used also for the mock-up, while two options are still under evaluation for manifolds/diffuser, CuCrZr and stainless Steel 316 L(N)-IG, depending on the joining technology. Since the mock-up is mainly intended to verify hydraulic performances, it has been simplified by removing the W monoblocks from its PFCs. © 2019 ENEA Frascati, Fusion & Technology for Nuclear Safety and The Authors

Published
2019

10. Progress in the initial design activities for the European DEMO divertor: Subproject 'Cassette'

Author

G. Di Gironimo, G. Ramogida, P.A. Di Maio, Maria Teresa Porfiri, Jeong-Ha You, Rosaria Villari, Massimo Zucchetti, G. Mariano, Danilo Nicola Dongiovanni, D. De Meis, C. Bachmann, Giuseppe Mazzone, D. Coccorese, E. Vallone, D. Marzullo, S. Garitta, V. Cocilovo, P. Frosi, You, Jh, Mazzone, G, Bachmann, Ch, Coccorese, D, Cocilovo, V, De Meis, D, Di Maio, Pa, Dongiovanni, D, Frosi, P, DI GIRONIMO, Giuseppe, Garitta, S, Mariano, G, Marzullo, D, Porfiri, Mt, Ramogida, G, Vallone, E, Villari, R, Zucchetti, M, Di Gironimo, G, You, Jeong-Ha, Mazzone, G., Bachmann, Ch., Coccorese, D., Cocilovo, V., De Meis, D., Di Maio, P.A., Dongiovanni, D., Frosi, P., Di Gironimo, G., Garitta, S., Mariano, G., Marzullo, D., Porfiri, M.T., Ramogida, G., Vallone, E., Villari, R., and Zucchetti, M.

Subjects
Engineering, Design activities, Neutronic, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Thermal hydraulics, Materials Science(all), 0103 physical sciences, Neutronics, General Materials Science, 010306 general physics, DEMO, Settore ING-IND/19 - Impianti Nucleari, Civil and Structural Engineering, Focus (computing), business.industry, Divertor, Mechanical Engineering, Divertor cassette, Cooling, Thermohydraulics, Electromagnetic loads, Thermohydraulic, Nuclear Energy and Engineering, DEMO, Divertor cassette, Neutronics, Cooling, Thermohydraulics, Electromagnetic loads, Systems engineering, Load analysis, Materials Science (all), business
Abstract

Since 2014 preconceptual design activities for European DEMO divertor have been conducted as an integrated, interdisciplinary R&D effort in the framework of EUROfusion Consortium. Consisting of two subproject areas, ‘Cassette’ and ‘Target’, this divertor project has the objective to deliver a holistic preconceptual design concept together with the key technological solutions to materialize the design. In this paper, a brief overview on the recent results from the subproject ‘Cassette’ is presented. In this subproject, the overall cassette system is engineered based on the load analysis and specification. The preliminary studies covered multi-physical analyses of neutronic, thermal, hydraulic, electromagnetic and structural loads. In this paper, focus is put on the neutronics, thermohydraulics and electromagnetic analysis.

Published
2017

11. Structural verification and manufacturing procedures of the cooling system, for DEMO divertor target (OVT).

Author

Mazzone, G., You, J-H., Cerri, V., Coccorese, D., Garitta, S., Di Gironimo, G., Marzullo, D., Di Maio, P.A., Vallone, E., Tincani, A., Bonavolontà, U., and Imbriani, V.

Subjects
*STAINLESS steel, *POWER plants, *SCHEDULING, *MANIFOLDS (Mathematics)
Abstract

The paper presents the design activities and testing plan of a vertical target mock-up, developed within the pre-conceptual design phase for DEMO Work Package DIV-1 "Divertor Cassette Design and Integration" - EUROfusion Power Plant Physics & Technology (PPPT) program. Activities concerning the Divertor Outboard Vertical Target cooling mock-up are presented in term of CAD model, thermal-hydraulic numerical simulation, structural analysis, structural integrity verification and manufacturing procedure. Moreover, the mechanical dimensions of support systems for Plasma Facing Components (PFCs), manifold and diffuser have been analyzed in detail, in order to avoid structural fault during the test. Test procedures are discussed, taking into account design parameters, design code and facility performances. The CuCrZr alloy selected for the PFCs of EU DEMO divertor has been used also for the mock-up, while two options are still under evaluation for manifolds/diffuser, CuCrZr and stainless Steel 316 L(N)-IG, depending on the joining technology. Since the mock-up is mainly intended to verify hydraulic performances, it has been simplified by removing the W monoblocks from its PFCs. [ABSTRACT FROM AUTHOR]

Published
2019
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12. Progress in the initial design activities for the European DEMO divertor: Subproject “Cassette”.

Author

You, J.H., Mazzone, G., Bachmann, Ch., Coccorese, D., Cocilovo, V., De Meis, D., Di Maio, P.A., Dongiovanni, D., Frosi, P., Di Gironimo, G., Garitta, S., Mariano, G., Marzullo, D., Porfiri, M.T., Ramogida, G., Vallone, E., Villari, R., and Zucchetti, M.

Subjects
*DIVERTERS (Electronics), *ELECTROMAGNETIC coupling, *HYDRAULIC machinery, *THERMAL hydraulics, *NEUTRONS
Abstract

Since 2014 preconceptual design activities for European DEMO divertor have been conducted as an integrated, interdisciplinary R&D effort in the framework of EUROfusion Consortium. Consisting of two subproject areas, ‘Cassette’ and ‘Target’, this divertor project has the objective to deliver a holistic preconceptual design concept together with the key technological solutions to materialize the design. In this paper, a brief overview on the recent results from the subproject ‘Cassette’ is presented. In this subproject, the overall cassette system is engineered based on the load analysis and specification. The preliminary studies covered multi-physical analyses of neutronic, thermal, hydraulic, electromagnetic and structural loads. In this paper, focus is put on the neutronics, thermohydraulics and electromagnetic analysis. [ABSTRACT FROM AUTHOR]

Published
2017
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13. Thermal-hydraulic optimisation of the DEMO divertor cassette body cooling circuit equipped with a liner

Author

J.-H. You, E. Vallone, P.A. Di Maio, G. Mazzone, S. Garitta, Di Maio P.A., Garitta S., You J.H., Mazzone G., and Vallone E.

Subjects
Materials science, Nuclear engineering, Thermofluid-dynamic, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, Thermal hydraulics, Divertor, law, 0103 physical sciences, Mass flow rate, Water cooling, General Materials Science, CFD analysi, 010306 general physics, DEMO, Settore ING-IND/19 - Impianti Nucleari, Civil and Structural Engineering, Pressure drop, Thermofluid-dynamics, Cassette body, Mechanical Engineering, Coolant, Nuclear Energy and Engineering, Flow velocity, Vacuum pump
Abstract

Within the framework of the Work Package DIV 1 - “Divertor Cassette Design and Integration” of the EUROfusion action, a research campaign has been jointly carried out by University of Palermo and ENEA to investigate the thermal-hydraulic performances of the DEMO divertor cassette cooling system. The research activity has been focused onto the most recent design of the Cassette Body (CB) cooling circuit equipped with a Liner, whose main function is to protect the underlying vacuum pump hole from the radiation arising from the plasma. The research campaign has been carried out following a theoretical-computational approach based on the Finite Volume Method and adopting the commercial Computational Fluid-Dynamic code ANSYS-CFX. The CB thermal-hydraulic performances have been assessed in terms of coolant and structure temperature, coolant overall pressure drop, flow velocity distribution and mass flow rate fed to the Liner cooling circuit, mainly in order to check coolant aptitude to provide a uniform and effective cooling to both CB and Liner structures. The outcomes of the study have shown some major criticalities, mainly in terms of water coolant vaporization as well as non-symmetric coolant distribution between the two Liner inlets. As a consequence, the following potential solutions have been successfully explored in order to allow the CB to safely operate while complying with its design constraints: • revising the CB design layout in order to increase the coolant mass flow rate fed to Liner; • increasing coolant inlet pressure to rise water saturation temperature and, hence, its margin against vaporization; • increasing coolant mass flow rate to reduce its overall thermal rise. The main results and the achieved optimized model are herewith described and critically discussed.

Published
2019

14. On the thermal-hydraulic optimization of DEMO divertor plasma facing components cooling circuit

Author

E. Vallone, P.A. Di Maio, M. Marino, J.-H. You, G. Mazzone, S. Garitta, Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., Marino, M., and Vallone, E.

Subjects
Nuclear engineering, Computational fluid dynamics, Thermofluid-dynamic, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Thermal hydraulics, Divertor, 0103 physical sciences, Water cooling, General Materials Science, CFD analysi, 010306 general physics, DEMO, Settore ING-IND/19 - Impianti Nucleari, Civil and Structural Engineering, Finite volume method, Critical heat flux, business.industry, Mechanical Engineering, Plasma facing component, Coolant, Flow velocity, Nuclear Energy and Engineering, Environmental science, Materials Science (all), business
Abstract

Within the framework of the Work Package Divertor, Subproject: Cassette Design and Integration (WPDIV-Cassette) of the EUROfusion action, a research campaign has been jointly carried out by ENEA and University of Palermo to investigate the thermal-hydraulic performances of the DEMO divertor cassette cooling system. Attention has been focussed on the divertor Plasma Facing Components (PFCs) cooling circuit and a parametric analysis has been carried out in order to assess the potential impact of proper layout changes on its thermal-hydraulic performances, mainly in terms of coolant total pressure drop, flow velocity distribution and margin against critical heat flux occurrence. The research activity has been carried out following a theoretical-computational approach based on the finite volume method and adopting a qualified Computational Fluid-Dynamic (CFD) code. Results obtained have allowed to select a revised PFCs cooling circuit configuration, suitable to comply with the prescribed thermal-hydraulic limits assumed for the DEMO divertor design. They are reported and critically discussed.

Published
2018
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