15 results on '"Garitta, S."'
Search Results
2. Computational study of the thermal-hydraulic behaviour of the DEMO Divertor cooling system
- Author
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Garitta, S., VELLA, Giuseppe, and CELLURA, Maurizio
- Subjects
thermal-hydraulic, CFD, DEMO, divertor ,Settore ING-IND/19 - Impianti Nucleari
3. Hydraulic analysis of EU-DEMO divertor plasma facing components cooling circuit under nominal operating scenarios
- Author
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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
4. Structural verification and manufacturing procedures of the cooling system, for DEMO divertor target (OVT)
- Author
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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
5. Progress in the initial design activities for the European DEMO divertor: Subproject 'Cassette'
- Author
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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
6. Numerical simulation of the transient thermal-hydraulic behaviour of the ITER blanket cooling system under the draining operational procedure
- Author
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E. Vallone, R. Raffray, G. Dell’Orco, S. Garitta, P.A. Di Maio, G.A. Spagnuolo, A. Furmanek, Mario Merola, R. Mitteau, Di Maio, PA, Dell’Orco, G, Furmanek, A, Garitta, S, Merola, M, Mitteau, R, Raffray, R, Spagnuolo, GA, Vallone, E, Di Maio, P., Dell'Orco, G., Furmanek, A., Garitta, S., Merola, M., Mitteau, R., Raffray, R., Spagnuolo, G., and Vallone, E.
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Finite volume method ,RELAP5 ,Computer simulation ,Mechanical Engineering ,Nuclear engineering ,Blanket ,Coolant ,Thermal hydraulics ,blanket ,Nuclear Energy and Engineering ,Thermal-hydraulic ,Water cooling ,Thermal-hydraulic, RELAP5, Draining, Blanket ,Environmental science ,General Materials Science ,Transient (oscillation) ,draining ,Settore ING-IND/19 - Impianti Nucleari ,Civil and Structural Engineering ,Electronic circuit - Abstract
Within the framework of the research and development activities supported by the ITER Organization on the blanket system issues, an intense analysis campaign has been performed at the University of Palermo with the aim to investigate the thermal-hydraulic behaviour of the cooling system of a standard 20° sector of ITER blanket during the draining transient operational procedure. The analysis has been carried out following a theoretical-computational approach based on the finite volume method and adopting the RELAP5 system code. In a first phase, attention has been focused on the development and validation of the finite volume models of the cooling circuits of the most demanding modules belonging to the standard blanket sector. In later phase, attention has been put to the numerical simulation of the thermal-hydraulic transient behaviour of each cooling circuit during the draining operational procedure. The draining procedure efficiency has been assessed in terms of both transient duration and residual amount of coolant inside the circuit, observing that the former ranges typically between 40 and 120 s and the latter reaches at most ∼8 kg, in the case of the cooling circuit of twinned modules #6–7. Potential variations to operational parameters and/or to circuit lay-out have been proposed and investigated to optimize the circuit draining performances. In this paper, the set-up of the finite volume models is briefly described and the key results are summarized and critically discussed.
- Published
- 2014
7. Thermal-hydraulic optimisation of the DEMO divertor cassette body cooling circuit equipped with a liner
- Author
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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
8. On the thermal-hydraulic optimization of DEMO divertor plasma facing components cooling circuit
- Author
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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
- Full Text
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9. Analysis of steady state thermal-hydraulic behaviour of the DEMO Divertor cassette body cooling circuit
- Author
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J.-H. You, Giuseppe Mazzone, S. Garitta, P.A. Di Maio, E. Vallone, Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., and Vallone, E.
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Finite volume method ,Steady state ,business.industry ,Mechanical Engineering ,Nuclear engineering ,Divertor ,Computational fluid dynamics ,DEMO, Divertor, Cassette body, CFD analysis,Thermofluid-dynamics ,7. Clean energy ,01 natural sciences ,010305 fluids & plasmas ,Coolant ,Subcooling ,Thermal hydraulics ,Materials Science(all) ,Nuclear Energy and Engineering ,0103 physical sciences ,Water cooling ,Environmental science ,General Materials Science ,010306 general physics ,business ,Settore ING-IND/19 - Impianti Nucleari ,Civil and Structural Engineering - 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.
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- 2017
10. Thermal-hydraulic behaviour of the DEMO divertor plasma facing components cooling circuit
- Author
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J.-H. You, S. Garitta, E. Vallone, Giuseppe Mazzone, P.A. Di Maio, Di Maio, P.A., Garitta, S., You, J.H., Mazzone, G., and Vallone, E.
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Work package ,Computer science ,Hydraulics ,Nuclear engineering ,Computational fluid dynamics ,7. Clean energy ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Thermal hydraulics ,Materials Science(all) ,law ,0103 physical sciences ,Water cooling ,General Materials Science ,010306 general physics ,Settore ING-IND/19 - Impianti Nucleari ,Civil and Structural Engineering ,Finite volume method ,business.industry ,Mechanical Engineering ,Divertor ,DEMO, Divertor, Plasma Facing Components, CFD analysis, Hydraulics ,Plasma ,Nuclear Energy and Engineering ,business - 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.
- Published
- 2017
11. On the optimization of the first wall of the DEMO water-cooled lithium lead outboard breeding blanket equatorial module
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Ruggero Forte, P.A. Di Maio, G. Bongiovì, P. Arena, S. Garitta, Pierluigi Chiovaro, Di Maio, P., Arena, P., Bongiovì, G., Chiovaro, P., Forte, R., and Garitta, S.
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Steady state ,Computer science ,Mechanical Engineering ,Nuclear engineering ,chemistry.chemical_element ,Blanket ,01 natural sciences ,7. Clean energy ,Finite element method ,Square (algebra) ,010305 fluids & plasmas ,DEMO reactor, WCLL blanket, First wall ,Nuclear Energy and Engineering ,Heat flux ,chemistry ,0103 physical sciences ,Thermal ,General Materials Science ,Lithium ,010306 general physics ,Lead (electronics) ,Settore ING-IND/19 - Impianti Nucleari ,Civil and Structural Engineering - Abstract
Within the framework of EUROfusion R&D activities a research campaign has been carried out at the University of Palermo in order to investigate the thermo-mechanical performances of the DEMO water-cooled lithium lead (WCLL) breeding blanket first wall (FW). The research campaign has been mainly focused on the optimization of the FW geometric configuration in order to maximize the heat flux it may safely withstand fulfilling all the thermal, hydraulic and mechanical requirements foreseen by safety codes. Attention has been focused on the FW flat concept endowed with square cooling channels and the potential influence of its four main geometrical parameters on its thermo-mechanical performances has been assessed performing a parametric analysis by means of a qualified commercial finite element method code. A set of 5929 different FW geometric configurations has been considered and the thermal performances of each one of them have been numerically assessed in case it undergoes 26 different values of heat flux on its plasma-facing surface. The resulting 154154 thermal analyses have allowed to select those cases fulfilling the adopted thermal-hydraulic requirements, whose thermo-mechanical performances have been numerically assessed under both normal operation and over-pressurization steady state loading scenarios to check whether they met the mechanical requirements prescribed by the pertaining SDC-IC safety rules. Four optimized FW configurations have been found to safely withstand a heat flux up to 2 MW/m2 fulfilling all the rules prescribed by safety codes. Finally, the thermo-mechanical performances of these FW optimal configurations have been further investigated under both normal operation and over-pressurization steady state loading scenarios setting-up more realistic 3D FEM models. Results obtained, herewith presented and critically discussed, have allowed to select one promising FW geometrical configuration.
- Published
- 2016
12. First Flight Escape Probability and Uncollided Flux of Nuclear Particles in Convex Bodies with Spherical Symmetry
- Author
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S. Garitta, Pierluigi Chiovaro, P.A. Di Maio, E. Vallone, Giuseppe Vella, Chiovaro, P., Di Maio, P., Garitta, S., Vallone, E., and Vella, G.
- Subjects
Physics ,020209 energy ,Regular polygon ,Flux ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Classical mechanics ,Nuclear Energy and Engineering ,Simple (abstract algebra) ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,First flight escape probability, uncollided flux ,Circular symmetry ,Settore ING-IND/19 - Impianti Nucleari - Abstract
This paper deals with the evaluation of the first flight escape probability of nuclear particles from convex bodies with spherical symmetry by means of some geometrical arguments and very simple probability considerations. The cases of a full sphere, a one-region spherical shell with an empty central zone, a spherical shell region containing a black central zone, and a full sphere with a sourceless shell have been considered. In all the aforementioned cases, a homogeneous medium and uniform isotropic source have been taken into account. Moreover, a simple and general formula has been derived for the calculation of the uncollided flux that is presupposed to be valid for arbitrary geometries. The results obtained have been validated by Monte Carlo analyses performed by the Monte Carlo N-Particle (MCNP5) code and critically discussed.
- Published
- 2016
13. Analysis of the steady state hydraulic behaviour of the ITER blanket cooling system
- Author
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P.A. Di Maio, R. Raffray, R. Mitteau, E. Vallone, A. Furmanek, S. Garitta, Mario Merola, G.A. Spagnuolo, G. Dell’Orco, Di Maio, P., Dell'Orco, G., Furmanek, A., Garitta, S., Merola, M., Mitteau, R., Raffray, R., Spagnuolo, G., and Vallone, E.
- Subjects
Pressure drop ,Finite volume method ,Steady state ,ITER, Blanket, Hydraulics ,Critical heat flux ,Mechanical Engineering ,Mass flow ,Nuclear engineering ,Blanket ,Coolant ,Nuclear Energy and Engineering ,Water cooling ,Environmental science ,General Materials Science ,Settore ING-IND/19 - Impianti Nucleari ,Civil and Structural Engineering - Abstract
The blanket system is the ITER reactor component devoted to providing a physical boundary for plasma transients and contributing to thermal and nuclear shielding of vacuum vessel, magnets and external components. It is expected to be subjected to significant heat loads under nominal conditions and its cooling system has to ensure an adequate cooling, preventing any risk of critical heat flux occurrence while complying with pressure drop limits. At the University of Palermo a study has been performed, in cooperation with the ITER Organization, to investigate the steady state hydraulic behaviour of the ITER blanket standard sector cooling system. A theoretical–computational approach based on the finite volume method has been followed, adopting the RELAP5 system code. Finite volume models of the most critical blanket cooling circuits have been set-up, realistically simulating the coolant flow domain. The steady state hydraulic behaviour of each cooling circuit has been investigated, determining its hydraulic characteristic function and assessing the spatial distribution of coolant mass flow rates, velocities and pressure drops under reference nominal conditions. Results obtained have indicated that the investigated cooling circuits are able to provide an effective cooling to blanket modules, generally meeting ITER requirements in term of pressure drop and velocity distribution, except for a couple of circuits that are being revised.
- Published
- 2015
14. Analysis of the steady state thermal-hydraulic behaviour of the ITER blanket cooling system
- Author
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DI MAIO, Pietro Alessandro, GARITTA, Silvia, VALLONE, Eugenio, Dell’Orco, G, Furmanek, A, Merola, M, Mitteau, R, Raffray, R, Spagnuolo, GA, Di Maio, PA, Dell’Orco, G, Furmanek, A, Garitta, S, Merola, M, Mitteau, R, Raffray, R, Spagnuolo, GA, and Vallone, E
- Subjects
blanket ,ITER ,thermal-hydraulics ,Settore ING-IND/19 - Impianti Nucleari - Published
- 2014
15. Hydraulic Analysis of Blanket Cooling System
- Author
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DI MAIO, Pietro Alessandro, GARITTA, Silvia, VALLONE, Eugenio, Spagnolo, GA, Di Maio, PA, Garitta, S, Spagnolo, GA, and Vallone, E
- Subjects
blanket ,ITER ,thermal-hydraulics ,Settore ING-IND/19 - Impianti Nucleari - Published
- 2013
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