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Almjashev V.I.,Saint Petersburg Electrotechnical University | Barrachin M.,Institute for Radiological Protection and Nuclear Safety | Bechta S.V.,Ap Aleksandrov Research Institute Of Technology | Bottomley D.,Institute for Transuranium Elements | And 11 more authors.
Journal of Nuclear Materials | Year: 2010

Experimental results of the investigation of the FeO 1+x-UO 2-ZrO 2 system in neutral atmosphere are presented. The ternary eutectic position and the composition of the phases crystallized at this point have been determined. The phase diagram is constructed for the FeO 1+x-enriched region and the onset melting temperature of 1310 °C probably represents a local minimum and so will be a determining factor in this system and its application to safety studies in nuclear reactors. © 2010 Elsevier B.V. All rights reserved.


Komlev A.A.,Albanova University Center | Almjashev V.I.,Ap Aleksandrov Research Institute Of Technology | Bechta S.V.,Albanova University Center | Khabensky V.B.,Ap Aleksandrov Research Institute Of Technology | And 2 more authors.
Journal of Nuclear Materials | Year: 2015

A new functional (sacrificial) material has been developed in the Fe2O3-SrO-Al2O3-CaO system based on strontium hexaferrite ceramic in concrete matrix. The method of producing SM has been advanced technologically; this technological effectiveness allows the SM to be used in ex-vessel core catchers with corium spreading as well as in crucible-type core catchers. Critical properties regarding the efficiency of SM in ex-vessel core catchers, such as porosity, pycnometric density, apparent density, solidus and liquidus temperatures, and water content have been measured. Suitable fractions of SrFe12O19 and high alumina cement (HAC) were found in the SM based on thermodynamic analysis of the SM/corium interaction. The use of sacrificial steel as an additional heat adsorption component in the core catcher allowed us to increase the mass fraction range of SrFe12O19 in the SM from 0.3-0.5 to 0.3-0.85. The activation temperature of the SM/corium interaction has been shown to correspond to the liquidus temperature of the local composition at the SM/corium interface. The calculated value of this temperature was 1716 °C. Analysis of phase transformations in the SrO-Fe2O3 system revealed advantages of the SrFe12O19-based sacrificial material compared with the Fe2O3-contained material owing to the time proximity of SrFe12O19 decomposition and corium interaction activation. © 2015 Elsevier B.V. All rights reserved.


Buryakov I.A.,Ap Aleksandrov Research Institute Of Technology
Journal of Analytical Chemistry | Year: 2011

The physicochemical principles of ion mobility spectrometry are described; Russian publications issued between 1991 and 2010 and devoted to the development of the fundamentals and technical implementation of this method, its use for physicochemical research, and solving problems of analytical chemistry, safety, medicine, and ecology, are reviewed. © 2011 Pleiades Publishing, Ltd.


Buryakov I.A.,Ap Aleksandrov Research Institute Of Technology
Journal of Analytical Chemistry | Year: 2011

Ion mobility spectrometry is an effective method for detecting mine-explosive devices and explosive charges and for revealing objects and peoples who came into contact with explosives. This is because of the excellent analytical and performance characteristics of the corresponding instruments. In the present work, we described the objects to be detected, formulated the basic terms and definitions, considered the physicochemical basics of the separation of ions by their mobility in a gas under an electric field, and presented experimental data on the main analytical characteristics of spectrometers: their ability to identify analytes, resolution power, time to provide readings, sensitivity, and detection limit. © 2011 Pleiades Publishing, Ltd.

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