Tesi etd-10212014-185536 |
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Tipo di tesi
Tesi di laurea specialistica
Autore
VIVIANI, GIORGIA VALERIA
URN
etd-10212014-185536
Titolo
Optimization of the RELAP model for the E-SCAPE pool facility based on CFD analysis
Dipartimento
INGEGNERIA DELL'ENERGIA, DEI SISTEMI, DEL TERRITORIO E DELLE COSTRUZIONI
Corso di studi
INGEGNERIA ENERGETICA
Relatori
relatore Dott. Forgione, Nicola
relatore Prof. Ambrosini, Walter
correlatore Ing. Tichelen, Katrien van
correlatore Ing. Castelliti, Diego
relatore Prof. Ambrosini, Walter
correlatore Ing. Tichelen, Katrien van
correlatore Ing. Castelliti, Diego
Parole chiave
- thermal hydraulics
- optimization
- CFD analysis
- RELAP analysis
Data inizio appello
28/11/2014
Consultabilità
Tesi non consultabile
Data di rilascio
28/11/2084
Riassunto
MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) is a multi-purpose flexible fast spectrum irradiation facility, for Research and Development (R&D) applications, cooled by liquid lead-bismuth (Pb-Bi).
E-SCAPE (European SCAled Pool Experiment) is a thermal-hydraulic scaled model of the MYRRHA reactor. The aim of this facility is to simulate the operating conditions during forced and natural circulation in a reactor using LBE as a coolant, in order to analyse the thermal-hydraulic phenomena occurring in the reactor pool and to validate the codes used in the preliminary analysis of the system, comparing the results obtained with the simulations and the experimental results.
The present work, conducted in collaboration with the SCK•CEN staff, focuses on the thermal-hydraulic analysis of E-SCAPE in steady state conditions during natural and forced circulations. Transient conditions were also simulated in order to analyse the reactor behaviour during operational accidents.
A RELAP5 model of E-SCAPE has been implemented, reproducing the current configuration. The results obtained from the RELAP5 simulations provide important information about E-SCAPE's behaviour, such as the LBE mass flow rate, temperature, pressure and the level of the free surfaces, in steady-state conditions (forced and natural circulation) and during accidental transients,.
Due to the inadequacy of RELAP5 to investigate the three dimensional flow phenomena, a Computational Fluid Dynamic (CFD) analysis of the lower plenum has been performed using the code ANSYS CFX 14.0, in order to acquire more information about the flow behaviour inside the E-SCAPE lower plenum. Several analysis in steady-state and transient conditions have been implemented, in order to simulate the flow behaviour inside the lower plenum in different conditions.
The results obtained with both codes have been used to improve the models and to reduce the inaccuracies of previous simulations.
E-SCAPE (European SCAled Pool Experiment) is a thermal-hydraulic scaled model of the MYRRHA reactor. The aim of this facility is to simulate the operating conditions during forced and natural circulation in a reactor using LBE as a coolant, in order to analyse the thermal-hydraulic phenomena occurring in the reactor pool and to validate the codes used in the preliminary analysis of the system, comparing the results obtained with the simulations and the experimental results.
The present work, conducted in collaboration with the SCK•CEN staff, focuses on the thermal-hydraulic analysis of E-SCAPE in steady state conditions during natural and forced circulations. Transient conditions were also simulated in order to analyse the reactor behaviour during operational accidents.
A RELAP5 model of E-SCAPE has been implemented, reproducing the current configuration. The results obtained from the RELAP5 simulations provide important information about E-SCAPE's behaviour, such as the LBE mass flow rate, temperature, pressure and the level of the free surfaces, in steady-state conditions (forced and natural circulation) and during accidental transients,.
Due to the inadequacy of RELAP5 to investigate the three dimensional flow phenomena, a Computational Fluid Dynamic (CFD) analysis of the lower plenum has been performed using the code ANSYS CFX 14.0, in order to acquire more information about the flow behaviour inside the E-SCAPE lower plenum. Several analysis in steady-state and transient conditions have been implemented, in order to simulate the flow behaviour inside the lower plenum in different conditions.
The results obtained with both codes have been used to improve the models and to reduce the inaccuracies of previous simulations.
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