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Asmolov V.G.,Rosenergoatom Concern | Povarov V.P.,A Branch of Rosenergoatom Concern | Vitkovskii S.L.,A Branch of Rosenergoatom Concern | Berkovich V.Ya.,Gidropress Experimental Design Office | And 4 more authors.
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

Basic statements of the Concept of Extending the Service Life of the VVER-440-Based Power Units at the Novovoronezh NPP beyond 45 years are considered. This topic is raised in connection with the fact that that in December 2016 and in December 2017 the extended service lives of Units 3 and 4 at this NPP will expire. The adopted concept of repeatedly extending the service life of the Novovoronezh NPP Unit 4 implies fitting the power unit with additional reactor core cooling systems with a view to extend the (ultimate) design-basis accidents (which have hitherto been adopted to be a loss of coolant accident involving a leak of reactor coolant through a break with a nominal diameter of 100 mm) to a reactor coolant leak equivalent to rupture of the main reactor coolant pipeline. The modified Unit 4 will also use the safety systems of Unit 3 that is going to be decommissioned. Preliminary calculated assessments of the new design-basis accident scenario involving rupture of the reactor coolant pipeline in Unit 4 fitted with a new configuration of safety systems confirmed the correctness of the adopted concept of repeatedly extending the service life of Unit 4. © 2014 Pleiades Publishing, Inc.

Kabakchi S.A.,RAS Research Center Kurchatov Institute | Arkhipov O.P.,Gidropress Experimental Design Office | Lukashenko M.L.,RAS Research Center Kurchatov Institute
High Energy Chemistry | Year: 2013

A previously unknown feature of the kinetics of the radiolysis of water and hydrogen, oxygen, and hydrogen peroxide solutions has been discussed. By calculation, it has been revealed that concentration oscillations of the radiolysis products can appear during irradiation of the solution with fast neutrons or mixed n,γ-radiation with a high portion of the neutron component. The period and amplitude of the oscillations depend on the temperature, the dose rate, and the ratio of n/γ radiation components. It has been shown that oscillations cannot be excited during γ-radiolysis under any conditions. It is suggested that the mechanism of the oscillations is similar to the Belousov-Zhabotinsky reaction mechanism. A chain reaction proceeds in the irradiated system, in which the reactants H2O 2 ("reducing agent"), "oxidizing agent" OH radicals initiating the chain, and the "catalyst" are introduced from the outside. Hydrogen molecules produced by the action of radiation play the role of the "catalyst", and H2O molecules formed in the secondary reactions are the "deactivated form of the catalyst". Hydrogen atoms and hydrated electrons propagate the chain. Oxygen formed in both spurs and the secondary reactions is the "inhibitor" terminating the chain reaction. © 2013 Pleiades Publishing, Ltd.

Bezrukov Yu.A.,Gidropress Experimental Design Office | Astakhov V.I.,Gidropress Experimental Design Office | Bykov M.A.,Gidropress Experimental Design Office | Strebnev N.A.,Gidropress Experimental Design Office | Lisenkov E.A.,Gidropress Experimental Design Office
Thermal Engineering (English translation of Teploenergetika) | Year: 2010

The experimental data and correlations for calculating critical heat flux that are used in substan-tiating the safety of a VVER-1200 reactor plant are analyzed. © Pleiades Publishing, Inc., 2010.

Trunov N.B.,Gidropress Experimental Design Office | Popadchuk V.S.,Gidropress Experimental Design Office | Davidenko S.E.,Gidropress Experimental Design Office | Zhukov R.Yu.,Gidropress Experimental Design Office
Thermal Engineering (English translation of Teploenergetika) | Year: 2010

Optimal approaches for monitoring the state and blanking of the tube bundles of horizontal tube generators are considered, and pressing problems associated with managing their service life are discussed. © Pleiades Publishing, Inc., 2010.

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