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      Inter-assembly gap deviations in VVER-1000: Accounting for effects on engineering margin factors Translated title: Berücksichtigung der Abweichungen zwischen den Brennelementen in WWER-1000-Reaktoren durch ingenieurtechnische Toleranzfaktoren

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      1 , 1 , 1 , * , , 1
      Kerntechnik
      Carl Hanser Verlag

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          Abstract

          Jacketless fuel assemblies change their form in the course of operation. Often they bow lengthwise. Primarily, these fuel assembly (FA) bows threaten to reduce the control rods' fall rate, but at the same time they change (e. g. increase) the amount of moderator in inter-assembly gaps, thus producing additional power surges. Gap sizes vary randomly and their impact is accounted for with the help of engineering margin factors. For VVER-1000, this account of engineering margin factors increases the fuel component of electricity generation cost by 3–5%, and a half of this increase is due to inter-assembly gap variations. This paper discusses the technique used to account for the impact produced by these gaps on fuel rod power; gives numerical values of sensitivity factors for power variations vs. gap sizes depending on the computational model assumed; and discusses the interference of gap effects and the account of power and coolant temperature feedbacks.

          Kurzfassung

          Während des Betriebs von KKW verändern die Abstandshalter der Brennelemente ihre Form, so dass sich beispielsweise kleine Abweichungen und Spalte zwischen den Brennelementen bilden können. Diese können sowohl die Moderatormenge lokal verändern und zu lokalen Leistungsschwankungen führen als auch den Einfall der Kontrollstäbe lokal behindern. Ihr Einfluss auf die Leistungsverteilung im Kern sollte in Berechnungen berücksichtigt werden. In diesem Beitrag wird eine Technik zur Berücksichtigung dieser Effekte durch die Einführung ingenieurtechnischer Toleranzfaktoren vorgestellt. Dabei werden auch Sensitivitäten und Überlagerungen mit anderen Parametern diskutiert.

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          Most cited references5

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          Computational technique for lateral/axial bend of jacketless FAs under VVER-1000 operational loads

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            Probabilistic method to assess the effect of gaps between FAs on VVER-1000 core power

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              Accounting for VVER-1000 FA bow on fuel rod power

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                Author and article information

                Journal
                kt
                Kerntechnik
                Carl Hanser Verlag
                0932-3902
                2195-8580
                27 August 2015
                : 80
                : 4
                : 408-411
                Affiliations
                1 Nuclear Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., Moscow, 123182, Russian Federation
                Author notes
                Article
                KT110518
                10.3139/124.110518
                a726bd3b-f862-4903-a8d7-e62d6353eacc
                © 2015, Carl Hanser Verlag, München
                History
                : 2 February 2015
                Page count
                References: 11, Pages: 4
                Categories
                Technical Contributions/Fachbeiträge

                Materials technology,Materials for energy,Nuclear physics
                Materials technology, Materials for energy, Nuclear physics

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