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No abstract available
Journal
Atomnaya Ehnergiya; ISSN 0004-7163; 
; v. 45(5); p. 384-385
; v. 45(5); p. 384-385
[en] Analysis of the efficiency of different methods for solving heterogeneous equations of generalized perturbation theory used for determination of nuclear reactor critical parameters is conducted. An algorithm for solving these equations by means of two-layer Tschebyscheff extrapolation is developed. The problem of internal and external iteration coordination is considered. The rate of convergence of each method is analytically and numerically evaluated. High efficiency of the Tschebyscheff polynomial method use for solving heterogeneous equations of generalized perturbation theory is displayed
Journal
Atomnaya Ehnergiya; ISSN 0004-7163; ; v. 52(1); p. 52-56
; v. 52(1); p. 52-56
[en] Reasons of essential divergences in computer and experimental values of efficiency of rod worth measurements at WWER are discussed. Influence of effects of neutron flux space distribution is considered as the most significant reason. The procedure is suggested that makes possible rule out the influence of space effects on the results of measurements of efficiency of rod worth measurements. Possibilities of the suggested procedure were illustrated by the examples of data processing of experiments at the WWER-440 and -1000 power blocks
[ru]
Обсуждаются причины существенных расхождений расчетных и экспериментальных значений эффективности органов регулирования, наблюдаемых во время пусковых экспериментов на ВВЭР. В качестве наиболее значимой причины рассматривается влияние эффектов пространственного распределения нейтронного потока. Предлагается методика, которая позволяет исключить влияние пространственных эффектов на результаты измерения эффективности органов регулирования. Возможности предлагаемой методики проиллюстрированы на примерах обработки результатаов эспериментов, проводившихся на энергоблоках с ВВЭР-440 и -1000Journal
[en] In the AER materials a great attention is given to the necessity of accounting for spatial effects of neutron flux redistribution in the WWER scram drop measurements. It has been emphasized that the said spatial effects manifest themselves the stronger the higher is the absolute value of negative reactivity inserted into the rector. It was proposed to determine the time dependence of the ratio of neutron density in the ion chamber's location to the neutron flux averaged over the reactor using the dynamic BIPR-8 KN or NOSTRA-type code. At the same time it is known that in the insertion of a high negative reactivity (scram drop) the above ratio of neutron fluxes will remain unchanged during the whole measurement period. This fact makes it possible to use steady-state BIPR-type codes for this ratio (Authors)
Source
Vidovszky, I. (ed.); VUJE, Inc., 918 64 Trnava (Slovakia); KFKI Atomic Energy Research Institute, Reactor Analysis Laboratory, H-1525 Budapest 114, POB 49 (Hungary); NPP Dukovany, 675 50 Dukovany (Czech Republic); Institute State Scientific and Technical Center for Nuclear and Radiation Safety, 35-37 Radgospna street, 03142 Kyiv-142 (Ukraine); Kozloduy NPP plc, Kozloduy 3321 (Bulgaria); Jaslovske Bohunice NPP (Slovakia); Nuclear Research Institute Rez plc, CZ-250 68 Husinec-Rez, cp.130 (Czech Republic); ALTA Dukovany, NPP Dukovany, 675 50 Dukovany (Czech Republic); Budapest University of Technology and Economics, Institute of Nuclear Techniques, Budapest XI, Mueegyetem rkp. 9, 1111 (Hungary); International Atomic Energy Agency (IAEA), Wagramerstrasse 5, P.O.Box 100, A-1400 Vienna (Austria); 783 p; ISBN 963-372-632 8; ; Nov 2005; p. 311-317; 15. Atomic Energy Research Symposium on WWER Reactor Physics and Reactor Safety; Znojmo (Czech Republic); 3-7 Oct 2005; Also available from VUJE, Inc., Okruzna 5, 918 64 Trnava (SK); 4 figs., 1 tab., 4 refs.
; Nov 2005; p. 311-317; 15. Atomic Energy Research Symposium on WWER Reactor Physics and Reactor Safety; Znojmo (Czech Republic); 3-7 Oct 2005; Also available from VUJE, Inc., Okruzna 5, 918 64 Trnava (SK); 4 figs., 1 tab., 4 refs.
[en] The paper discusses the influence of the reactor parameters limits for normal operation on the economical performance of WWER fuel cycles. It is shown for the typical WWER fuel cycles that decreasing the limits for the main power distribution parameters to 10% leads to decreasing the fuel components of the electricity cost price up to 4-5%. As the nowadays limitations are reached the dependence becomes weaker. (Authors)
Source
Vidovszky, I. (Kiadja az MTA KFKI Atomenergia Kutatointezet, Budapest (Hungary)); Fortum Nuclear and Thermal (Finland); VTT Technical Research Centre of Finland (Finland); Lappeenranta University of Technology (Finland); The Aalto University School of Science and Technology (Finland); Paks NPP Ltd., Paks (Hungary); KFKI Atomic Energy Research Institute, Budapest (Hungary); Budapest University of Technology and Economics, Institute of Nuclear Techniques, Budapest (Hungary); Hungarian Atomic Energy Authority (Hungary); VUJE, Inc., Trnava (Slovakia); Slovak University of Technology, Faculty of Electrical Engineering and Information Technology, Department of Nuclear Physics and Technology, Bratislava (Slovakia); Nuclear Regulatory Authority of the Slovak Republic (Slovakia); Nuclear Research Institute Rez plc, Husinec-Rez (Czech Republic); Skoda JS a.s., Plzen (Czech Republic); CEZ , Inc. (Czech Republic); University of Defence in Brno (Czech Republic); The University of West Bohemia Faculty of Applied Sciences (Czech Republic); Russian Research Center 'Kurchatov Institute', Moscow (Russian Federation); JSC OKB 'GIDROPRESS' (Russian Federation); JSC 'TVEL' (Russian Federation); Forschungszentrum Dresden- Rossendorf, Institute of Safety Research, Dresden (Germany); GRS mbH (Germany); Studsvik Scandpower GmbH (Germany); TUEV SUED Industrie Service, Energy and Technology (Germany); Gesellschaft fuer Anlagen - und Reaktorsicherheit (Germany); Studsvik Scandpower (Sweden); State Scientific and Technical Centre on Nuclear and Radiation Safety of Ukraine, Kyiv (Ukraine); Nuclear and Radiation Safety Centre (Armenia); Jiangsu Nuclear Power Corporation, Tianwan Nuclear Power Station (China); Jiangsu Nuclear Power Corporation (China); 790 p; ISBN 978-963-372-643-3 (OE); ; Oct 2010; p. 1-7; 20. Atomic Energy Research Symposium on WWER Physics and Reactor Safety; Hanasaari, Espoo (Finland); 20-24 Sep 2010; 1 fig.; 8 refs.
; Oct 2010; p. 1-7; 20. Atomic Energy Research Symposium on WWER Physics and Reactor Safety; Hanasaari, Espoo (Finland); 20-24 Sep 2010; 1 fig.; 8 refs.
No abstract available
Journal
Atomnaya Ehnergiya; ISSN 0004-7163; ; v. 45(5); p. 386-387
; v. 45(5); p. 386-387
[en] Presence of spacing grid in fuel assembly noticeably decreases local energy release due to small local change of uranium-water ratio. Condition of total energy release conservation leads to some increase in maximum of axial power distribution. With MCU Monte Carlo code these increase/decrease were calculated for some VVER-440 and VVER-1000 F As. Since geometry of spacing grid is very complicated, two different sensibly simplified models were proposed. Both gave close results. Local minimums turn out to be ∼5% lower than average and local maximums increase slightly more than 1%. (Authors)
Source
Vidovszky, I. (Kiadja az MTA KFKI Atomenergia Kutatointezet, Budapest (Hungary)); Fortum Nuclear and Thermal (Finland); VTT Technical Research Centre of Finland (Finland); Lappeenranta University of Technology (Finland); The Aalto University School of Science and Technology (Finland); Paks NPP Ltd., Paks (Hungary); KFKI Atomic Energy Research Institute, Budapest (Hungary); Budapest University of Technology and Economics, Institute of Nuclear Techniques, Budapest (Hungary); Hungarian Atomic Energy Authority (Hungary); VUJE, Inc., Trnava (Slovakia); Slovak University of Technology, Faculty of Electrical Engineering and Information Technology, Department of Nuclear Physics and Technology, Bratislava (Slovakia); Nuclear Regulatory Authority of the Slovak Republic (Slovakia); Nuclear Research Institute Rez plc, Husinec-Rez (Czech Republic); Skoda JS a.s., Plzen (Czech Republic); CEZ , Inc. (Czech Republic); University of Defence in Brno (Czech Republic); The University of West Bohemia Faculty of Applied Sciences (Czech Republic); Russian Research Center 'Kurchatov Institute', Moscow (Russian Federation); JSC OKB 'GIDROPRESS' (Russian Federation); JSC 'TVEL' (Russian Federation); Forschungszentrum Dresden- Rossendorf, Institute of Safety Research, Dresden (Germany); GRS mbH (Germany); Studsvik Scandpower GmbH (Germany); TUEV SUED Industrie Service, Energy and Technology (Germany); Gesellschaft fuer Anlagen - und Reaktorsicherheit (Germany); Studsvik Scandpower (Sweden); State Scientific and Technical Centre on Nuclear and Radiation Safety of Ukraine, Kyiv (Ukraine); Nuclear and Radiation Safety Centre (Armenia); Jiangsu Nuclear Power Corporation, Tianwan Nuclear Power Station (China); Jiangsu Nuclear Power Corporation (China); 790 p; ISBN 978-963-372-643-3 (OE); ; Oct 2010; p. 1-5; 20. Atomic Energy Research Symposium on WWER Physics and Reactor Safety; Hanasaari, Espoo (Finland); 20-24 Sep 2010; 3 figs.; 3 tabs.; 1 ref.
; Oct 2010; p. 1-5; 20. Atomic Energy Research Symposium on WWER Physics and Reactor Safety; Hanasaari, Espoo (Finland); 20-24 Sep 2010; 3 figs.; 3 tabs.; 1 ref.
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