Numerical analysis of the dust distribution during LOVA

Tong, Lili

doi:10.1016/j.anucene.2015.09.025

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…The process of Prandtl-Meyer expansion fan generated by the jet at the inlet is isentropic expansion. In isentropic flow, according to expression (9), it is assumed that the total temperature of the flow remains unchanged, if the flow is accelerated, the temperature of the flow will decrease continuously during the acceleration process [18]. Thus, the color of the temperature distribution in figure 12(c) is the opposite of the color of the velocity distribution in figure 12(a).…”

Section: 22mentioning

confidence: 99%

“…Xu [8] simulated the dust migration process in CFETR under a LOVA, and the results showed that the dust concentration in some areas of the VV met the range of ignition and explosion. Tong et al [9] simulated the migration process of beryllium dust in ITER when a LOVA occurred by using the computational fluid dynamics (CFD) method, and studied the dust distribution at different heights. The results showed that the volume fraction of beryllium dust decreases with an increase in height.…”

Section: Introductionmentioning

confidence: 99%

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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: 22mentioning

confidence: 99%

Section: Introductionmentioning

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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show abstract

“…Also, integrated computer codes widely used in fission field such as MELCOR [42] have been applied to evaluate accident steps and consequences in fusion reactors [43, 44, 45, 46] but a precise estimation on source term inventories as input for the software is still missing. Along with initial inventories, design and operational parameters are essential inputs to run the safety codes for accident scenarios analysis.…”

Section: Introductionmentioning

confidence: 99%

A novel integrated approach for the hazardous radioactive dust source terms estimation in future nuclear fusion power plants

Poggi

Malizia

Ciparisse

et al. 2016

Heliyon

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An open issue still under investigation by several international entities working on the safety and security field for the foreseen nuclear fusion reactors is the estimation of source terms that are a hazard for the operators and public, and for the machine itself in terms of efficiency and integrity in case of severe accident scenarios. Source term estimation is a crucial key safety issue to be addressed in the future reactors safety assessments, and the estimates available at the time are not sufficiently satisfactory. The lack of neutronic data along with the insufficiently accurate methodologies used until now, calls for an integrated methodology for source term estimation that can provide predictions with an adequate accuracy. This work proposes a complete methodology to estimate dust source terms starting from a broad information gathering. The wide number of parameters that can influence dust source term production is reduced with statistical tools using a combination of screening, sensitivity analysis, and uncertainty analysis. Finally, a preliminary and simplified methodology for dust source term production prediction for future devices is presented.

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Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor

et al. 2021

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Numerical analysis of the dust distribution during LOVA

Cited by 5 publications

References 9 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

A novel integrated approach for the hazardous radioactive dust source terms estimation in future nuclear fusion power plants

Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor

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