ITER (International Thermonuclear Experimental Reactor) is a magnetically confined plasma nuclear reactor. Inside it, due to plasma disruptions, the formation of neutron-activated powders, which are essentially made out of tungsten and beryllium, occurs. As many windows for diagnostics are present on the reactor, which operates at very low pressure, a LOVA (Loss of Vacuum Accident) could be possible and may lead to dust mobilisation and a toxic and radioactive fallout inside the plant. This study is aimed at reproducing numerically the first seconds of a LOVA in ITER, in order to get information about the dust resuspension risk. This work has been carried out by means of a CFD (Computational Fluid Dynamics) simulation of the beginning of the pressurisation transient inside the whole Tokamak. It has been found that the pressurization transient is extremely slow, and that the friction speed on the walls is very high, and therefore a high mobilization risk of the dust is expected on the entire internal surface of the reactor. It has been observed that a LOVA in a real-scale reactor is more severe than the one reproduced in reduced-scale facilities, as STARDUST-U, because the speeds are higher, and the dust resuspension capacity of the flow is greater.

Ciparisse, J.-., Rossi, R., Malizia, A., Gaudio, P. (2018). 3D simulation of a loss of vacuum accident (LOVA) in ITER (international thermonuclear experimental reactor): Evaluation of static pressure, Mach number, and friction velocity. ENERGIES, 11(4), 856 [10.3390/en11040856].

3D simulation of a loss of vacuum accident (LOVA) in ITER (international thermonuclear experimental reactor): Evaluation of static pressure, Mach number, and friction velocity

Rossi R.
Investigation
;
Malizia A.
Supervision
;
Gaudio P.
Funding Acquisition
2018

Abstract

ITER (International Thermonuclear Experimental Reactor) is a magnetically confined plasma nuclear reactor. Inside it, due to plasma disruptions, the formation of neutron-activated powders, which are essentially made out of tungsten and beryllium, occurs. As many windows for diagnostics are present on the reactor, which operates at very low pressure, a LOVA (Loss of Vacuum Accident) could be possible and may lead to dust mobilisation and a toxic and radioactive fallout inside the plant. This study is aimed at reproducing numerically the first seconds of a LOVA in ITER, in order to get information about the dust resuspension risk. This work has been carried out by means of a CFD (Computational Fluid Dynamics) simulation of the beginning of the pressurisation transient inside the whole Tokamak. It has been found that the pressurization transient is extremely slow, and that the friction speed on the walls is very high, and therefore a high mobilization risk of the dust is expected on the entire internal surface of the reactor. It has been observed that a LOVA in a real-scale reactor is more severe than the one reproduced in reduced-scale facilities, as STARDUST-U, because the speeds are higher, and the dust resuspension capacity of the flow is greater.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/10 - Fisica Tecnica Industriale
Settore ING-IND/19 - Impianti Nucleari
English
Con Impact Factor ISI
LOVA; dust resuspension; CFD
Ciparisse, J.-., Rossi, R., Malizia, A., Gaudio, P. (2018). 3D simulation of a loss of vacuum accident (LOVA) in ITER (international thermonuclear experimental reactor): Evaluation of static pressure, Mach number, and friction velocity. ENERGIES, 11(4), 856 [10.3390/en11040856].
Ciparisse, J-; Rossi, R; Malizia, A; Gaudio, P
Articolo su rivista
File in questo prodotto:
File Dimensione Formato  
energies-11-00856-v2.pdf

accesso aperto

Licenza: Copyright dell'editore
Dimensione 20.68 MB
Formato Adobe PDF
20.68 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/210767
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 6
social impact