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Seleznev V.E.,Physical and Technical Center
Journal of Combustion | Year: 2010

This paper presents a method for numerical evaluation of parameters of flammable liquid pool fires caused by storage tank or trunkline failures. The method may be useful for specialists working in oil, gas, and chemical industries. It was successfully applied in fire safety analysis of Russian gas and oil processing facilities. Copyright 2010 Vadim E. Seleznev. Source


Aleshin V.V.,Physical and Technical Center | Seleznev V.E.,Physical and Technical Center
Contemporary Engineering Sciences | Year: 2014

The paper describes an approach to the numerical analysis of response of nuclear power plant buildings including soil-structure interaction effects. A reinforced concrete structure of an NPP reactor building under operating and seismic loadings is considered. The simulated seismic load corresponds to a maximum designed earthquake of magnitude 7 (the peak ground surface acceleration is 0.12 g). The numerical analysis was performed by the finite element method in a 3D nonlinear statement using the FEM-programs ANSYS and LS-DYNA. Review of the numerical analysis results demonstrated that the presented technique can be successfully applied to seismic design of NPP structures. © 2014 Vladimir V.Aleshin and Vadim E. Seleznev. Source


Seleznev V.E.,Physical and Technical Center | Aleshin V.V.,Physical and Technical Center
Advances in Safety, Reliability and Risk Management - Proceedings of the European Safety and Reliability Conference, ESREL 2011 | Year: 2012

This paper presents a method for numerical evaluation of parameters of flammable liquid pool fires caused by storage tank or trunkline failures. As is well known, combustion of liquid fuel spilled on the terrain adjacent to the region of trunkline (or storage tank) rupture takes place as combustion of a stream of its vapor in the air. One of the main tasks of the considered approach practical application is to obtain significant upper estimate of potential or analysis of actual consequences of heat damage for facilities adjacent to pool fire site at the rupture region of trunklines transporting combustible fluids. At that it is necessary to take into consideration not only intensity, but also duration of fire. The method may be useful for specialists working in oil and gas, and chemical industries. It was successfully applied in fire safety analysis of gas and oil processing facilities. © 2012 Taylor & Francis Group. Source


Seleznev V.E.,Physical and Technical Center | Aleshin V.V.,Physical and Technical Center | Pryalov S.N.,Physical and Technical Center
Science and Technology of Nuclear Installations | Year: 2011

The paper describes one of the variants of mathematical models of a fluid dynamics process inside the containment, which occurs in the conditions of operation of spray systems in severe accidents at nuclear power plant. The source of emergency emissions in this case is the leak of the coolant or rupture at full cross-section of the main circulating pipeline in a reactor building. Leak or rupture characteristics define the localization and the temporal law of functioning of a source of emergency emission (or accrued operating) of warmed up hydrogen and steam in the containment. Operation of this source at the course of analyzed accident models should be described by the assignment of the relevant Dirichlet boundary conditions. Functioning of the passive autocatalytic recombiners of hydrogen is described in the form of the complex Newton boundary conditions. Copyright © 2011 Vadim E. Seleznev et al. Source


Seleznev V.,Physical and Technical Center | Aleshin V.,Physical and Technical Center | Pryalov S.,Physical and Technical Center
11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012, PSAM11 ESREL 2012 | Year: 2012

The paper describes one of the variants of mathematical model of a fluid dynamics process inside the containment, which occurs in the conditions of functioning of spray systems at severe accidents at nuclear power plant. The source of emergency emissions in this case is the leak of the heat carrier or rupture at full cross section of the main circulating pipeline in a reactor building. The leak or rupture characteristics define the localization and the temporal law of functioning of a source of emergency emission (or accrued operating) of warmed-up hydrogen and steam in the containment. Functioning of this source at the course of analyzed accident models is reasonably to carry out by the assignment of the relevant Dirichlet boundary conditions. Functioning of the passive autocatalytic recombiners of hydrogen is described in the form of the complex Newton boundary conditions, which parameters of changes in time are determined by using a wellknown principle of submodeling. The work of the heat exchangers-condensers is simulated by the Newton boundary conditions, which is similar to the boundary conditions on the walls of an inner protective shell with its steel facing taken into account. The suggested in the paper models are oriented on their application by the engineers who are dealing with designing of nuclear power plants and who do not have power computers. One of the obligatory conditions at the development of mathematical model was the correct description of processes of functioning of a spray system and a heat removal in the coated with the steel walls of the containment taking into consideration the condensation of steam on it. The main functions of spray system are the decrease of pressure inside of the containment at accident and prevention of formation of explosive hydrogen/steam/air clouds in the containment rooms. Combustion risk of clouds in this case is estimated by the well-known Shapiro diagram. Source

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