Analyses of loss of vacuum accident (LOVA) in ITER

Honda, Takeshi; Bartels, H. W.; Merrill, B.J.; Inabe, Teruo; Petti, David A.; Moore, Richard L.; Okazaki, Takashi

doi:10.1016/s0920-3796(99)00067-8

Cited by 29 publications

(11 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Biasi correlation allows a best fit of Rock'n'Roll model onto many resuspension experiments. It is described in equations (13) and (14) and plotted in Figure 2 (Biasi model). These correlations may be used in the "Rock'n'Roll" model developed by…”

Section: Force (N )mentioning

confidence: 99%

“…Several studies have been conducted in order to understand the phenomenon of particle resuspension that highlight the main driver which is the friction velocity [11] [12] [13]. These studies also helped to characterize the competition between the airflow forces and the adhesive forces, for different particle diameters and to develop the resuspension Rock'n'Roll model [14] [15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

CFD modelling of particle resuspension in a toroidal geometry resulting from airflows during a loss of vacuum accident (LOVA)

Gélain

Gensdarmes

Peillon

et al. 2020

Fusion Engineering and Design

View full text Add to dashboard Cite

Section: Force (N )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CFD modelling of particle resuspension in a toroidal geometry resulting from airflows during a loss of vacuum accident (LOVA)

Gélain

Gensdarmes

Peillon

et al. 2020

Fusion Engineering and Design

View full text Add to dashboard Cite

“…However, there is also a "hot dust" limit (defined as dust on surfaces with T > 400 ∘ C) of 6 kg each of C, Be, and W [65]. These limits have been developed to avoid, also in the case of severe accident, the evacuation of the population from the area surrounding the plant [66]. The loss of coolant accidents (LOCA), loss of coolant flow accidents (LOFA), and loss of vacuum accidents (LOVA) [67] are types of accidents that may jeopardize components and plasma vessel integrity and cause dust mobilization risky for workers and public [68].…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

Safety Analysis in Large Volume Vacuum Systems Like Tokamak: Experiments and Numerical Simulation to Analyze Vacuum Ruptures Consequences

Malizia

Lupelli

Richetta

et al. 2014

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The large volume vacuum systems are used in many industrial operations and research laboratories. Accidents in these systems should have a relevant economical and safety impact. A loss of vacuum accident (LOVA) due to a failure of the main vacuum vessel can result in a fast pressurization of the vessel and consequent mobilization dispersion of hazardous internal material through the braches. It is clear that the influence of flow fields, consequence of accidents like LOVA, on dust resuspension is a key safety issue. In order to develop this analysis an experimental facility is been developed: STARDUST. This last facility has been used to improve the knowledge about LOVA to replicate a condition more similar to appropriate operative condition like to kamaks. By the experimental data the boundary conditions have been extrapolated to give the proper input for the 2D thermofluid-dynamics numerical simulations, developed by the commercial CFD numerical code. The benchmark of numerical simulation results with the experimental ones has been used to validate and tune the 2D thermofluid-dynamics numerical model that has been developed by the authors to replicate the LOVA conditions inside STARDUST. In present work, the facility, materials, numerical model, and relevant results will be presented.

show abstract

“…It has been long realised that dust remobilization is a major safety issue for ITER and future fusion devices, owing to the possibility of radioactive or toxic dust release upon loss of vacuum accidents (LOVAs) [1][2][3]. In such scenarios, air ingress in the vacuum vessel creates an outward flow after pressure equilibration which leads to hydrodynamic forces that can potentially mobilize dust grains [4,5].…”

Section: Introductionmentioning

confidence: 99%

Dust remobilization in fusion plasmas under steady state conditions

Tolias

Ratynskaia

Angeli

et al. 2016

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

The first combined experimental and theoretical studies of dust remobilization by plasma forces are reported. The main theoretical aspects of remobilization in fusion devices under steady state conditions are analyzed. In particular, the dominant role of adhesive forces is highlighted and generic remobilization conditions -direct lift-up, sliding, rolling -are formulated. A novel experimental technique is proposed, based on controlled adhesion of dust grains on tungsten samples combined with detailed mapping of the dust deposition profile prior and post plasma exposure. Proof-ofprinciple experiments in the TEXTOR tokamak and the EXTRAP-T2R reversed-field pinch are presented. The versatile environment of the linear device Pilot-PSI allowed for experiments with different magnetic field topologies and varying plasma conditions that were complemented with camera observations.

show abstract

Analyses of loss of vacuum accident (LOVA) in ITER

Cited by 29 publications

References 10 publications

CFD modelling of particle resuspension in a toroidal geometry resulting from airflows during a loss of vacuum accident (LOVA)

CFD modelling of particle resuspension in a toroidal geometry resulting from airflows during a loss of vacuum accident (LOVA)

Safety Analysis in Large Volume Vacuum Systems Like Tokamak: Experiments and Numerical Simulation to Analyze Vacuum Ruptures Consequences

Dust remobilization in fusion plasmas under steady state conditions

Contact Info

Product

Resources

About