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Sergey G Alexeev

Sergey G Alexeev
MyHom

Dr Ph, Ass. Prof., Colonel (Ret.)

About

247
Publications
25,645
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366
Citations
Additional affiliations
September 2013 - present
Science and Engineering Centre “Reliability and Safety of Large Systems” of Ural Branch of Russian Academy of Sciences
Position
  • Senior Researcher
April 2006 - present
Ural State Fire Service Institute of Emercom of Russia
Position
  • Head of Department, Senior Researcher
April 2006 - September 2008
Ural Institute of State Fire Service of Emercom of RF
Position
  • Professor (Associate)

Publications

Publications (247)
Article
The paper analyzes the gas phase, the behavior uranium, the calculation of thermophysical properties during heating of nuclear reactor graphite containing various actinides. The study was carried out by thermodynamic modeling using the TERRA software package in the range from 423 to 2123 K at a constant pressure of 0.1 MPa. Up to a temperature of 6...
Article
The structural changes of condensed fullerenes C 60 and C 28 at a temperature increase from 200 K to 2000 K have been studied by computational methods using the TERRA software for carbon-argon systems. The processes of destruction of fullerenes C 60 and C 28 molecules are presented, and the temperature ranges of their thermal stability are determin...
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Full-text available
The article considers thermal characteristics of the radioactive graphite–CuO-Na 2 CO 3 -K 2 CO 3 -NaCl-KCl system in argon atmosphere. Thermodynamic calculations were carried out in the Terra program. Four temperature ranges with changes of thermal characteristics of the radioactive graphite–CuO-Na 2 CO 3 -K 2 CO 3 -NaCl-KCl system in argon atmosp...
Article
Full-text available
The behavior of Am, Eu, Sr radionuclides was investigated by thermodynamic modeling method at heating of radioactive graphite in NaCl – KCl – Na 2 CO 3 – K 2 CO 3 molten salt with additives of nickel oxide NiO. The integrated thermodynamic analysis was carried out by means of TERRA software in temperature range 373-3273 K to determine possible comp...
Article
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The present paper considers oxidation of multi-walled carbon nanotubes at different heating rates and temperatures to ensure the process in the kinetic region. The nanotubes were analyzed by the method of synchronous thermal analysis. Experiments were carried out at different heating rates: 5, 10 and 20 °C/min. As a result, the character of thermog...
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Currently, the vaping (use of electronic cigarettes) is seen as a safe and harmless alternative to the traditional use of tobacco products. Incidents that took place during the use of electronic cigarettes destroy the stereotype of their fire and explosion safety. In this work, a number of the fire hazard characteristics of working and model liquid...
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The article examines the computer�simulated thermodynamic behavior of radionuclides U, Cl, Pu, Be, Ni, and Am when radioactive graphite is heated in a carbon dioxide atmosphere over a wide temperature range. The aim of the work is to estimate the equilibrium composition of the gas and condensed phases during a probable beyond design basis accident...
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When determining the fire hazard characteristics of liquids and solids, abnormal situa-tions may arise in which the use of standard techniques is either ineffective or impos-sible. Four such situations are considered in this paper for testing of heterogeneous liquids, solvents with low flash point and thermally unstable powders. The special test al...
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In this paper, the thermophysical characteristics of the fullerene-argon (C 32 -Ar) system at atmospheric pressure are studied by thermodynamic modeling using the TERRA software system. Two groups of processes occurring in the system under consideration are determined: sublimation reactions with thermal dissociation and thermal dissociation reactio...
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Graphite elements of nuclear power plants accumulate in time a small amount of uranium, radionuclide conversion elements, as well as fission products, which creates additional difficulties in the utilization of graphite masonry. We proposed a new method of processing, based on high-temperature separation in a nitrogen atmosphere. The processing con...
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The method of thermodynamic simulation is used to determine the thermal diffusivity and the thermal conductivity of the melt 42 mass.% Bi-40.6 masses.% Pb-10 Macc.% Sn-7.4 mass % Cd depending on temperature. It was found that the thermal conductivity and thermal diffusivity of melts Bi-Pb-Sn-Cd, Bi-Pb-Sn, Bi-Pb differ by no more than 15%. The obtai...
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Full-text available
More than 100 power reactors, reactors for plutonium production, and research reactors are presently available in the world. In these reactors, graphite is used as a reflector, moderator, and cladding of fuel elements. Flameless combustion is a promising method for reducing the amount of solid radioactive waste. The method is based on the oxidation...
Article
Full-text available
The behavior of some radionuclides (U, Eu, Pu) in the utilization of radioactive graphite by the combustion method in oxygen is considered. The study was carried out by thermodynamic modeling in the temperature range 300-3300 K. The main physicochemical processes occurring during oxidation were established.
Article
Full-text available
The behavior of Cl, Ca, Be, Ni, and Cs radionuclides in the course of heating of radioactive graphite in steam was studied by thermodynamic modeling. Complete thermodynamic analysis at temperatures in the interval from 373 to 3273 K was performed using the TERRA program with the aim of determining the possible composition of the gas phase. The mode...
Article
Full-text available
kerosene era when candle lighting was replaced by kerosene. The side effect of this was the growth of fires and explosions due to the use of unsafe kerosene. There was a need to develop criteria for safe kerosene. The fire (burning) and flash point of kerosene were chosen as such indicators. The first stage of creating instruments to determine thes...
Article
Full-text available
620137, Свердловская область, г. Екатеринбург, ул. Учителей 32. АНО «Уральский научно-исследовательский институт ВДПО». 620062, Свердловская область, г. Екатеринбург, ул. Мира, д. 22. Уральский институт ГПС МЧС России. 620049, Свердловская область, г. Екатеринбург, ул. Студенческая 54А. Научно-инженерный центр «Надежность и ресурс больших систем и...
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When cutting metal by electric welding, a brown smoke (NO2) is released from the waste sulfuric acid vessel. As a result of fighting fire service allowed to enter of water into the reservoir, which leads to increased smoke emissions of nitrogen oxides. With the help of foam attack and the process of neutralization by sodium bicarbonate, it is possi...
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The heat of evaporation at normal boiling point and the boiling point are determined for dialkyl alkynes by the rules of the carbon chain. A comparative analysis of two variants of the carbon chain rules with the method of the software ACD/Lab 2014 and the additive group method of Smolyakov and Grebeshkov is carried out. It is shown that two varian...
Article
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Dimethyl ether is a potential alternative fuel, hydrogen donor in fuel cells, refrigerant, propellant and component for perfumery and cosmetic compositions and composi-tions. In this regard, there is a need to study the thermal properties of dimethyl ether. The thermodynamic modeling of the system behavior (1 dimethyl ether – 11 water) under heatin...
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Full-text available
For the example of 80 organic solvents, the method developed by the All-Russian Research Institute for Fire Protection (ARRIFP) and the Baker–Strehlow–Tang (BST) method for the prediction of vapor-cloud explosions (VCE) in enclosed spaces are compared, in terms of the specific safe volume of a building. A correlation is found between the results gi...
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The thermal behavior of the radioactive graphite–argon system at a pressure of 105 Pa was studied by thermodynamic simulation. The distribution of the elements of the system by phases and the thermophysical properties of the system are determined.
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Results of thermodynamic modeling of radioactive graphite-nitrogen system heating which can be applied as reference data and can be used in technological processes of high-temperature processing of reactor graphite are given in the article.
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The concentration and temperature dependences of the melt components are calculated and the composition of the steam phase and partial pressures of the steam components over the melt Bi-Pb-Sn-Cd are determined by thermodynamic modeling, using the TERRA software package and the model of the ideal solution of interaction products at a temperature of...
Article
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Fire and explosion hazard classification of liquids is important for fire safety in the workplace and at household. Now various countries have established their own classifications of flammable and combustible liquids, which have the general tendency to convergence. The history of this classification is associated with the oil and gas industry revo...
Article
Consideration has been given to the capabilities of the TERRA software system for modeling thermodynamically the heating of a radioactive graphite–inert gas system in a nuclear reactor. As a result of such modeling, the authors have determined processes occurring in the reactor with the involvement of Eu, Pu, and U actinoids during the heating of t...
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Full-text available
Graphite occupies a specific place among the entire mass of accumulated radioactive wastes. The problem of reclamation of spent graphite has not yet been solved in the world. The behavior of radioactive graphite in the multicomponent CuO–NaCl–KCl–Na2CO3–K2CO3 melt in an argon atmosphere in the temperature range 373–3273 K is studied by thermodynami...
Article
Full-text available
Thermodynamic modeling of the behavior of carbon cluster C4 at heating in an argon atmosphere under atmospheric pressure has been carried out via the program complex TERRA. The graphs for the dependences of the gas and condensed phases’ compositions on the temperature in the studied �4-Ar system were constructed. The physical-chemical processes wer...
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Next myths (misconceptions and stereotypes): «Alligatoring», «Crazed glass», «Depth of char», «Line of demarcation», «Sagged furniture springs», «Melting materials», and «Gasoline vapors are readily ignited by a cigarette» are examined. They take place in foreign and Russian fire investigations. The formation of coarse coal, a material trace of cra...
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Диметиловый эфир является потенциальным альтернативным топливом, доно-ром водорода в топливных элементах, хладагентом, пропеллентом и компонен-том для парфюмерных и косметических композиций и составов. В связи с этим возникает потребность изучения термических свойств диметилового эфира. Проведено термодинамическое моделирование поведения системы (3...
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Full-text available
Graphite is used as moderator and reflector of neutrons. In addition, in the construction of reactors, graphite is used as seals and bearings. The mass of graphite in the reactors is 1–2 tons At decommissioning graphite reactors produce large quantities of radioactive graphite waste. Existing methods of treatment of radioactive graphite based on it...
Article
Full-text available
Currently in the world there are power reactors, reactors for plutonium production and research reactors whose number is more than 100 pieces of Graphite in the above mentioned reactors is used as the reflector, moderator, and also as Fuel cladding. Flameless combustion is a promising method of reducing the amount of solid radioactive waste. Method...
Article
Classification of liquids on the basis of the fire and explosion characteristics plays an important role to ensure fire safety. The history of this classification is closely connected with oil revolution that took place in the second half of the 19th century in USA. Cheap kerosene led to the beginning of kerosene era. The increase of fires and expl...
Article
Full-text available
В атомной промышленности и ядерной энергетике графит получил широкое применение. В ближайшие 10–15 лет ресурс большинства блоков уран-графитовых реакторов России с учетом продления службы по результатам ремонтно-восста- новительных работ будет исчерпан. Переработка высокоактивного графита может осуществляется методом беспламенного окисления в распл...
Article
Full-text available
Graphite has a wide application in nuclear industry today. However, the resource of most uranium-graphite reactors in Russia considering their repair-and-renewal operations will be exhausted next 10-15 years. The processing of high-active graphite is made by flameless oxidation method in molten salts. The present work investigates the behavior of r...
Article
Full-text available
The problems of assessing the consequences of fuel-air mixtures and their prevention are topical and of practical interest. Such the explosions pose a real danger during processing, transportation and storage of fuels at various industrial and civil facilities. Forecast of possible consequences of explosions of fuel-air mixtures is a key element in...
Article
Full-text available
The behavior of actinides (U, Am, Pu) in the course of combustion of radioactive graphite in steam was studied by thermodynamic modeling. Thermodynamic modeling was performed using TERRA program in the temperature interval from 373 to 3273 K to determine the possible composition of volatile actinide species formed in the course of graphite utilizat...
Article
Full-text available
For the example of 80 organic solvents, the methods developed by the All-Russian Research Institute for Fire Protection (ARIFP) and the Dutch ME-TNO method for vapor cloud explosions (VCE) in enclosed spaces are compared. The comparison focuses on the safe volume of the building. The correlation between the results of the two methods is established...
Article
Full-text available
The design of nuclear reactors did not provide for decommissioning solutions, and there were no safe technologies to handle irradiated reactor graphite. Decommissioning of uranium–graphite reactors is a combination of complex tasks involving the selection of appropriate methods and techniques for the radioactive graphite handling. Computer modeling...
Article
Full-text available
Nuclear power plants are one of the main sources of power generation. In designing nuclear reactors, no technical solutions for decommissioning were provided, nor were there safe technologies of handling irradiated reactor graphite. Decommissioning of uranium graphite reactors represents a complex of difficult tasks connected with the choice of opt...
Article
Full-text available
Thermodynamic modeling of radioactive graphite oxidation in molten Na2CO3–K2CO3–NiO and Na2CO3–K2CO3–CuO at a temperature ranging from 373 to 3273 K. The behavior of radionuclides. Calculate the equilibrium constant of the reactions. Keywords: thermodynamic modeling, equilibrium constants of reactions of radioactive graphite, radionuclides, heat,...
Article
Full-text available
The behavior of radioactive elements (Am, Eu, Pu) was considered for the combustion of radioactive graphite in oxygen atmosphere. The study was conducted by the method of thermodynamic modeling in the temperature range 300–3300 K. The basic physical and chemical processes occurring during oxidation were studied and equilibrium constants of reaction...
Article
Full-text available
The problems of disposal of radioactive graphite by heat treatment are considered in article. Thermodynamic modeling was conducted; reactions involving U, Pu, Eu were identified while heating radioactive graphite in an argon atmosphere at different pressures. In this temperature range (373-3273 K) the thermal decomposition reaction of condensed sub...
Article
Full-text available
The problems of disposal of radioactive graphite by heat treatment are considered in article. Thermodynamic modeling was conducted; reactions involving U, Pu, Eu were identified while heating radioactive graphite in an argon atmosphere at different pressures. In this temperature range (373-3273 K) the thermal decomposition reaction of condensed sub...
Article
Full-text available
The behavior of radioactive elements (Am, Eu, Pu) was considered for the combustion of radioactive graphite in oxygen atmosphere. The study was conducted by the method of thermodynamic modeling in the temperature range 300–3300 K. The basic physical and chemical processes occurring during oxidation were studied and equilibrium constants of reaction...
Article
Full-text available
Thermodynamic modeling of the behavior of the representative higher fullerene С84 when heated in an inert environment at atmospheric pressure using the software com-plex "TERRA" was held. The distribution of carbon phases from the temperature in the system С84-Ar was plotted. The values of the thermophysical characteristics of the system plotted th...
Article
Full-text available
В настоящее время употребление электронных сигарет или вейпинг становится популярным среди различных слоев населения. Он позиционируется как безопасная и менее вредная, и даже совсем безвредная альтернатива традиционному курению табачных изделий. Борьба с курением создает бла-гоприятные условия для более широкого употребления e-сигарет. При этом но...
Article
Full-text available
Widely used in household kerosene in the second half of the 19th century led to an increase of fires and explosions. Kerosene widely used in household in the second half of the 19th century led to an increase of fires and explosions. Therefore there was a requirement to find and establish the safety kerosene criteria. The flashpoint of kerosene has...
Article
Full-text available
A historical analysis of the emergence and development of the concept of «flash point» was carried out. The contradictory nature of the flash point functions was shown. Interrelation of the occurrence of the flash point concepts and determination methods with the oil and gas industry revolution that occurred in the second half of the 19th century w...
Article
A lead–bismuth alloy is an advanced coolant for nuclear power plants. The study of this alloy is of current importance. However, performing high-temperature experiments involves many problems. In this work, to study evaporation of a lead–bismuth alloy in the presence of intermetallic compounds in the condensed phase and dimers and trimers of metals...
Article
Full-text available
Forecasting of basic fire hazard characteristics of 15 dialkyl carbonates is executed by methods of ACD/Lab 2014, GOST 12.1.044-89 and the carbon chain rules, which had been postulated earlier by the authors. It is shown that calculation through the conditional carbon chain descriptor yields the comparable results with procedures of ACD/Lab 2014, a...
Article
Full-text available
QSPR research of the correlation of flash point and chemical structure was carried out in a number of dialkylamines. Flash points of secondary amines were predicted by carbon chain rules. For the convenient practical application of carbon chain rules following empirical equations were offered for calculating flash point (FP) by of coefficients (a =...
Article
Full-text available
On the base of thermodynamic computer simulation, the equilibrium constants and temperature dependencies of the Gibbs energy have been calculated for the reactions occurred with U, Pu, Am, and Eu participation during the heating (combustion) of radioactive graphite in nitrogen medium. The balance of radionuclides in the system is determined in the...
Article
Full-text available
By means of the thermodynamic analysis, the behavior of radionuclides U, Am, Pu during heating radioactive graphite in the atmosphere of carbon dioxide is studied. It is established that uranium is present at a type of the vapors of UO2, UO3, of the ionized UO2+, UO3– and of the condensed U3O5; plutonium is present at a type of the vapors PuO, PuO2...