A viscoplastic approach to corium spreading during a severe nuclear accident

Schiano, Thomas; Bigot, B.; Haquet, Jean-François; Saramito, Pierre; Smutek, Claude

doi:10.1016/j.nucengdes.2022.112045

Cited by 2 publications

(3 citation statements)

References 28 publications

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“…However, these results are similar to the results of Gen Li, et al which showed that at high temperatures the melt transfer of ZrO2 and UO2 becomes faster [9]. In addition, Schiano et al also obtained a significant change in corium flow velocity at lower temperatures, which displayed the temperature profile and confirmed the rapid flow of several millimeters occurring at the start of the corium temperature rise during dispersion [16].…”

Section: Figure 6 Effect Of Dynamic Viscosity On Corium Flow Timesupporting

confidence: 86%

MPS Simulation on the Corium Melt Flow in Case of Reactor Accident

Tursinah,

Variastuti,

Omega

et al. 2024

gnd

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A simulation model has been made for molten corium in a nuclear reactor using the Moving Particle Semi-Implicit (MPS) method. By setting the value of dynamic viscosity and temperature of corium, simulations are carried out to display the pressure profile and flow velocity of the corium fluid that falls from the RPV to the plenum. In the first simulation to observe the pressure and velocity profile of the corium in the plenum, three conditions were made: the plenum was empty; the plenum was filled with corium fluid, and the plenum was filled with debris. The second simulation was carried out to determine the relationship between the time required for corium to reach the plenum for variations in corium viscosity and temperature values. The simulation results show that the increase in corium viscosity will be proportional to the length of time it takes to reach the plenum. In contrast to the effect of temperature where the increase in corium temperature will be the smaller the time required.

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Section: Figure 6 Effect Of Dynamic Viscosity On Corium Flow Timesupporting

confidence: 86%

MPS Simulation on the Corium Melt Flow in Case of Reactor Accident

Tursinah,

Variastuti,

Omega

et al. 2024

gnd

View full text Add to dashboard Cite

show abstract

“…Firstly, the problem (P) is discretized versus time using a, implicit second-order variable step finite difference scheme (BFD2) as in [11,14,27]. At each time step, an under-relaxed fixed point algorithm is used to solve the nonlinear subproblems in h, θ and ϕ.…”

Section: Numerical Resolutionmentioning

confidence: 99%

“…The volumetric melt flow rate of the melt is 8.4 10 −4 m 3 .s −1 [31] during 5 s, with t = 0 s corresponding to the start of inlet feeding. As argued in [27], this experiment could be modeled using the previous equations for the single phase case, here we aim to observe the influence of degassing on spreading, as it was observed on the experiment as described in [4]. Thereafter, tables 1 and 2 present the main flow and material properties of the VEU7 spreading test.…”

Section: Application To Coriummentioning

confidence: 99%