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Sorokin A.A.,RAS Institute of Problems in the Safe Development of Nuclear Energy
Atomic Energy | Year: 2015

Methods for modeling the coagulation in an aerosol code developed for calculating the behavior of multicomponent aerosols are examined. A comparative analysis is made and the methods are tested on model problems for conditions characterizing the formation of aerosols of fission products in the first loop of VVER during an accident with depressurization of fuel elements. © 2015 Springer Science+Business Media New York Source


Karkhov A.N.,RAS Institute of Problems in the Safe Development of Nuclear Energy
Atomic Energy | Year: 2012

The results of an economic analysis of the market and comparative assessments of the fossil-fuel and nuclear power technologies is presented, demonstrating that market profit includes in addition to the investment component, which depends on the rate of market growth, an innovation component determined by the advances made in science and technology. An energy system is considered in which different investment projects characterized by definite discounted costs, effective service life, and specific investments, are used. The total profit of the nuclear power plant technology is found to be equal to the sum of the investment and innovation components, so that a nuclear power plant can be considered to be an innovative technology. The investment component of profit, determined by the difference between the total profit and the corresponding innovation component, increases as a result of which the innovation component fraction in the total profit decreases. Source


Mitenkova E.F.,RAS Institute of Problems in the Safe Development of Nuclear Energy | Novikov N.V.,RAS Institute of Problems in the Safe Development of Nuclear Energy
Atomic Energy | Year: 2011

The calculation of the composition of irradiated fuel for different degrees of burnup is a basic problem in the analysis of nuclear-radiological safety of objects holding spent fuel assemblies. The yield of fission products is one of the important initial indicators in burnup calculations. Methods for compiling libraries of fission products yield on the basis of the ENDF/B up-to-date evaluated nuclear data files are described. The nuclide composition of uranium oxide and uranium-plutonium-zirconium metal fuel in sodium-cooled fast reactors is analyzed by means of high-precision calculations performed with different fission product yields libraries using different computer codes MONTEBURNS-MCNP5-ORIGEN2 and the results are presented. © 2011 Springer Science+Business Media, Inc. Source


Sorokin A.A.,RAS Institute of Problems in the Safe Development of Nuclear Energy
Atomic Energy | Year: 2015

Models of an aerosol module intended for calculating the formation and evolution of aerosol particles of fission products in the first loop of VVER in the case of a serious accident with emission of fission products from damaged fuel elements into the coolant are described. The characteristic features of the module are modeling of the nucleation kinetics of aerosols in the classical approximation, nonequilibrium condensation of the vapors of the fission products, fuel, and components of the reactor structures, and the method for calculating the coagulation of multicomponent aerosols. © 2015 Springer Science+Business Media New York Source


Sorokin A.A.,RAS Institute of Problems in the Safe Development of Nuclear Energy
Atomic Energy | Year: 2015

The modeling of the deposition of cesium, iodine, and silver in comparison with the PHEBUS FPT1 experiment is examined for two models of the formation of aerosols of fission products: taking account of nucleation and conservative setting of the initial size of the aerosols of nonvolatile components. It is shown that it is important to take aerosols into account in order to calculate the deposition of cesium and silver. The discrepancy between the computed deposition of iodine and experiment is primarily due to the absence of a model of the nonequilibrium chemistry of compounds in the gas phase. © 2015 Springer Science+Business Media New York Source

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