Sevostian Bechta

Continuous-parameter creep model for predicting reactor pressure vessel behavior under severe accident conditions

Xiangyu Li, Weimin Ma, Sevostian Bechta

Continuous-Parameter Creep Model for Predicting Reactor Pressure Vessel Behavior under Severe Accident Conditions

Xiangyu Li, Weimin Ma, Sevostian Bechta

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Results of the SSM-SICOPS melt tests of the EU-SAFEST project

G. Langrock, T. Keim, Manfréd M. Fischer, Matthias Braun et autres

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Reliability Assessment of the BWRX-300 Passive Isolation Condenser System : Addressing Uncertainties in Two-Phase Natural Circulation Flow Modeling

Graeme Trundle, Sevostian Bechta, Sergey Galushin, Sean Roshan Ghias et autres

Passive safety systems are increasingly utilized in prospective nuclear power plant designs. The low magnitude of the forces involved in such systems, combined with the uncertainty inherent in the factors affecting them, poses a problem in assessing their reliability compared to active …

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Modeling melt relocation with solidification and remelting using a coupled level-set and enthalpy-porosity method

Liang Chen, Yan Xiang, Lu Zhao, Di Fang et autres

A numerical model to simulate molten metal relocation with phase change is proposed, coupling the level-set method to track the metal-gas interface and an enthalpy-porosity model to handle phase changes between solid and liquid metal. This coupling simultaneously solves the evolution of …

Application of moving particle semi-implicit method on simulating melt spreading within OECD/ROSAU project

Lu Zhao, Maneesh Punetha, Weimin Ma, Sevostian Bechta et autres

In the context of severe accidents, considerable research efforts throughout the world are currently directed towards ex-vessel corium behavior. The NEA Reduction of Severe Accident Uncertainties (ROSAU) project aims to reduce knowledge gaps and uncertainties associated with two areas: the spreading of …

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Oxidation of molten zirconium-containing droplet in water

Qiang Guo, Yucheng Deng, Andrei A. Komlev, Weimin Ma et autres

During a severe accident in light water reactors, the molten reactor core (corium) falls into a water pool in the form of a jet. Complex interactions may occur between the melt and coolant known as molten fuel–coolant interactions (FCI), including energetic coolant …

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An experimental study on the impact of particle surface wettability on melt infiltration in particulate beds

Liang Chen, Andrei A. Komlev, Weimin Ma, Sevostian Bechta et autres

Melt infiltration into porous media is an intriguing phenomenon that holds immense significance across various sciences and technologies. In this work, the problem of metallic melt infiltration in particulate beds is investigated for understanding and prediction of severe accident progression associated with …

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An experimental study on the effect of coolant salinity on steam explosion

Yucheng Deng, Qiang Guo, Yan Xiang, Di Fang et autres

• The effects of coolant salinity on FCI and steam explosion are investigated. • The probability of spontaneous steam explosion increases as the coolant salinity increases from 0 to 35 g/kg. • The droplet has more deformation in seawater before melt-coolant direct …

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An Experimental Study on the Impact of Particle Surface Wettability on Melt Infiltration in Particulate Beds

Liang Chen, Andrei A. Komlev, Weimin Ma, Sevostian Bechta et autres

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Experimental and modelling results of the QUENCH-20 experiment with BWR test bundle

J. Stuckert, Sevostian Bechta, T. Hollands, Patrick Isaksson et autres

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Simulation of melt spreading over dry substrates with the moving particle Semi-implicit method

Lu Zhao, Maneesh Punetha, Weimin Ma, Alexander Konovalenko et autres

In a severe accident scenario of a light water reactor, the spreading of molten core materials (corium) on the floor of the reactor cavity may occur after the failure of the reactor pressure vessel (RPV), resulting in the so-called melt spreading process …

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