Implementation and validation of a resuspension model in MELCOR 1.8.6 for fusion applications

Bruno, Giordano; Paci, Sandro

doi:10.1016/j.fusengdes.2017.09.006

Cited by 7 publications

(1 citation statement)

References 30 publications

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“…The resuspension model based on the principle of mechanical balance considers that the deposited particles are mainly affected by the air flow force and the adhesion force of the deposited surface. When the air flow force is greater than the adhesion force, the dust will be resuspended [11,21]. The adhesion force is determined by the material properties and particle size of the dust.…”

Section: Analysis Of Friction Velocitymentioning

confidence: 99%

Highly underexpanded helium jet and its effect on dust resuspension under in-vessel loss of coolant accident of fusion reactor

Qin¹,

Zhang²,

Wang³

et al. 2022

Nucl. Fusion

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During an in-vessel loss of coolant accident (LOCA) of helium-cooled blanket in fusion reactor, the high pressure helium gas ingress into the vacuum vessel (VV) will produce highly underexpanded jet, resulting in the resuspension and migration of the radioactive dust deposited in the VV. In this study, the flow field in VV and the influence of friction velocity were simulated and analyzed by using ANSYS Fluent code. In addition, the differences between in-vessel LOCA and loss of vacuum accident (LOVA) were compared. The results showed that the pressure of the VV would reach the pressure relief limit of vacuum vessel pressure suppression system (VVPSS) rapidly after LOCA. With the development of LOCA, the Mach disk continued to move towards the equatorial break of the VV, and its shape continued to shrink, with the number of structures gradually increased. Compared with LOVA, the LOCA had a higher friction velocity, resulting in a greater probability of dust resuspension and radioactive risk.

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Section: Analysis Of Friction Velocitymentioning

confidence: 99%

Highly underexpanded helium jet and its effect on dust resuspension under in-vessel loss of coolant accident of fusion reactor

Qin¹,

Zhang²,

Wang³

et al. 2022

Nucl. Fusion

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Study on Resuspension Models Based on Force Balance

He¹,

Tong²,

Cao³

2023

Springer Proceedings in Physics

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During the severe accident of the nuclear power plant, the resuspension of the aerosol particles deposited in the containment would occur, due to some disturbance, resulting in the increase of radioactive aerosols released into the environment. Therefore, aerosol resuspension should be considered for the radiological consequence assessment. Accurate aerosol resuspension prediction model is very important.In this paper, three typical aerosol resuspension models considering force balance, named Wichner model, Michael model and ECART model, are investigated. These models follow the principle that resuspension occurs when the aerodynamic disturbing force is greater than the hindering force and differ in the consideration of the forces acting on particles. Wichner model proposes the aerodynamic disturbing force includes lift force, while Michael model considers it composed of lift and drag force, hindering effect of adhesive force is considered in the two models. ECART model considers the hindering force includes gravity, cohesive and adhesive force, the aerodynamic disturbing force is composed of drag, and burst force. Considering the aerosol characteristics and thermal hydraulic conditions during nuclear reactor severe accidents, the simulation for STORM and ART experiments with the three models is carried out. Finally, via comparing and analyzing the prediction results and experimental results, the applicability of these models is evaluated. Wichner model could reflect the rapid change of resuspension with the disturbing gas velocity and is in agreement with the experimental results for different particle sizes under different disturbing gas velocities, which is recommended for predicting aerosol resuspension behavior during nuclear reactor severe accidents.

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ASTEC Simulation of Dust Resuspension Behavior Induced by LOCA in Fusion Reactors

et al. 2023

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Implementation and validation of a resuspension model in MELCOR 1.8.6 for fusion applications

Cited by 7 publications

References 30 publications

Highly underexpanded helium jet and its effect on dust resuspension under in-vessel loss of coolant accident of fusion reactor

Highly underexpanded helium jet and its effect on dust resuspension under in-vessel loss of coolant accident of fusion reactor

Study on Resuspension Models Based on Force Balance

ASTEC Simulation of Dust Resuspension Behavior Induced by LOCA in Fusion Reactors

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