FeatUres OF FInanCIal InteGratIOn OF the eUrasIan eCOnOmIC UnIOn memBer states this work is devoted to the study of the issue related to the deepening and expansion of integration processes within the framework of the eurasian economic Union for sustainable development, constant technological renewal, increasing the competitiveness of the economies of the eurasian economic Union member states and increasing the standard of living of their population. the relevance of the topic is due to the high interest of the state authorities of russia in the development of this interstate association. the authors use content analysis of regulatory acts and open information materials on mutual financial flows of eurasian economic Union member states, analysis of discrete institutional alternatives, mathematical modeling, etc. Based on the analysis carried out in the work, a list of proposals for further progressive development of integration processes in the eurasian economic Union was formulated. the article was prepared on the basis of the results of studies carried out at the expense of budgetary allocations within the framework of the state task to the Financial University under the Government of the russian Federation.
Boric acid is used as a means for compensating reactivity and for ensuring subcriticality under different modes of operation in nuclear reactors. Hence, one of the possible reasons for the occurrence of emergencies in pressurized water reactors may be a reduction in the concentration of boron in the first circuit. When calculating the transients in a reactor the change in the boron concentration in the coolant is assumed to be instantaneous, and the distribution of the boron in space is assumed to be uniform [I, 2], which can only occur if the rate of mixing of the borated and pure water is infinitely high. In fact, under practical conditions there may be considerable nonuniformity in the boron distribution with time and nonuniformity in its distribution over the cross-section at the input to the active zone. Possible reasons for reactivity incidents which occur as a result of uncontrolled dilution of boron in the coolant were analyzed in [3]. The results of experimental investigations of transients are presented in [4, 5], in which a gap in a plug of unborated water is modeled in a model of a pressurized water reactor with a scale of 1:5.In this paper we present a nonstationary one-dimensional model for calculating the change in the concentration of boric acid in the water when it is diluted with pure water just before the input to the active zone. This model should be regarded only as a first step in developing a method of calculating the transients in the complete three-dimensional formulation, since the one-dimensional model may predict a nonuniformity in the boron concentration with time but not be capable of taking into account the spatial nonuniformity at the input to the active zone.Formulation of the Problem. We will investigate the fall in the concentration of boron due to the accumulation of pure water during the time the pumps are switched off. In this model the actual spatial structure is replaced by a onedimensional pipeline (Fig. 1). The change in the flow rate of the water in the pipeline after the pumps are switched on is described using the hydraulic approximation for the flow of an incompressible fluid (the rate of propagation of perturbations is assumed to be infinite) assuming a quadratic resistance lawwhere u is the flow rate of the coolant, referred to the effective transverse cross-section of the pipeline, t is the time, p is the density, dP/dx is the pressure gradient, and k is a coefficient representing the hydraulic resistance. We will assume that the buildup of the power of the pumps with time occurs linearly, and consequently the dependence of dP/dx on t has the form dP/dx It/to. 0 < t <-to;(dP/d*T o =/l, t > to,where (dP/dx)o is the pressure gradient in the pipeline corresponding to the total pump power and t o is the time taken for the pump to reach full power.IVTAN. ENITs. Moscow Technical University. MEI.
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