Verification of RELAP5-3D code in natural circulation loop as function of the initial water inventory

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Tipo di pubblicazione: Articolo in atti di convegno
Tipologia MIUR: Contributo in Atti di Convegno (Proceeding) > Contributo in atti di convegno
Titolo: Verification of RELAP5-3D code in natural circulation loop as function of the initial water inventory
Autori: Bertani, Cristina; Falcone, Nicolò; Bersano, Andrea; Caramello, Marco; Matsushita, Takahiro; De Salve, Mario; Panella, Bruno
Autori di ateneo:
Tipo di referee: Comitato scientifico
Editore: Università Politecnica delle Marche
Titolo del convegno: 35th UIT Heat Transfer Conference
Luogo dell'evento: Ancona, Italy
Data dell'evento: June 26-28, 2017
Luogo di pubblicazione: Ancona
Abstract: Abstract. High safety and reliability of advanced nuclear reactors, Generation IV and Small Modular Reactors (SMR), have a crucial role in the acceptance of these new plants design. Among all the possible safety systems, particular efforts are dedicated to the study of passive systems because they rely on simple physical principles like natural circulation, without the need of external energy source to operate. Taking inspiration from the second Decay Heat Removal system (DHR2) of ALFRED, the European Generation IV demonstrator of the fast lead cooled reactor, an experimental facility has been built at the Energy Department of Politecnico di Torino (PROPHET facility) to study single and two-phase flow natural circulation. The facility behavior is simulated using the thermal-hydraulic system code RELAP5-3D, which is widely used in nuclear applications. In this paper, the effect of the initial water inventory on natural circulation is analyzed. The experimental time behaviors of temperatures and pressures are analyzed. The experimental matrix ranges between 69 % and 93%; the influence of the opposite effects related to the increase of the volume available for the expansion and the pressure raise due to phase change is discussed. Simulations of the experimental tests are carried out by using a 1D model at constant heat power and fixed liquid and air mass; the code predictions are compared with experimental results. Two typical responses are observed: subcooled or two phase saturated circulation. The steady state pressure is a strong function of liquid and air mass inventory. The numerical results show that, at low initial liquid mass inventory, the natural circulation is not stable but pulsated.
Data: 2017
Status: Pubblicato
Lingua della pubblicazione: Inglese
Parole chiave:
Dipartimenti (originale): DENERG - Dipartimento Energia
Dipartimenti: DENERG - Dipartimento Energia
URL correlate:
    Area disciplinare: Area 09 - Ingegneria industriale e dell'informazione > IMPIANTI NUCLEARI
    Data di deposito: 13 Set 2017 19:31
    Data ultima modifica (IRIS): 13 Set 2017 19:39:57
    Data inserimento (PORTO): 15 Set 2017 02:00
    Permalink: http://porto.polito.it/id/eprint/2680100
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