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      Usage of burnt fuel isotopic compositions from engineering codes in Monte-Carlo code calculations Translated title: Verwendung von vorausberechneten Brennstoffzusammensetzungen in Monte-Carlo-Berechnungen

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      Carl Hanser Verlag

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          A burn-up calculation of VVER's cores by Monte-Carlo code is complex process and requires large computational costs. This fact makes Monte-Carlo codes usage complicated for project and operating calculations. Previously prepared isotopic compositions are proposed to use for the Monte-Carlo code (MCU) calculations of different states of VVER's core with burnt fuel. Isotopic compositions are proposed to calculate by an approximation method. The approximation method is based on usage of a spectral functionality and reference isotopic compositions, that are calculated by engineering codes (TVS-M, PERMAK-A). The multiplication factors and power distributions of FA and VVER with infinite height are calculated in this work by the Monte-Carlo code MCU using earlier prepared isotopic compositions. The MCU calculation data were compared with the data which were obtained by engineering codes.


          Die Berechnung des Abbrands eines WWER-Kerns mit einem Monte-Carlo-Programm ist komplex und erfordert einen sehr hohen Rechenaufwand. Daher ist die Nutzung von Monte-Carlo-Programmen für Betriebs- und Projektrechnungen selten. In diesem Beitrag wird gezeigt, dass vorbereitete isotope Brennstoffzusammensetzungen sehr gut als Eingangsgrößen für Monte-Carlo-Berechnungen verschiedener Kernzustände mit abgebranntem Brennstoff geeignet sind. Dabei werden die isotopen Brennstoffzusammensetzungen mit der Näherungsmethode basierend auf der Nutzung der spektralen Funktionalität und einer Referenzzusammensetzung mit Programmen wie TVS-M oder PERMAK-A berechnet. So werden die Multiplikationsfaktoren und der Leistungsverteilung von Brennelementen für WWER mit dem Monte-Carlo-Programm MCU bestimmt und mit den Ergebnissen der Programme TVS-M und PERMAK-A verglichen.

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          Development of approximation method to evaluate isotopic composition of burnt fuel

          This paper deals with the development of an approximation method to evaluate the isotopic composition of burnt VVER fuel rods (with U-Gd) by engineering codes (TVS-M, PERMAK-A) and taking into account fuel rods depletion conditions. Burn-up conditions for fuel rods differ from each other during operation due to the presence of water cavities, absorber and other within FA. Therefore, the isotopes evolution during burn-up in different fuel rods goes on in different manner even with identical values of fuel burn-up (MW · day/kg U). The isotopic content evolution can be described in detail by spectral codes. However, a full-size core calculation takes much running time. The approximation method, which takes into account fuel rods spectral differences during operation, was considered. The method is based on spectral functionality (a non asymptotic factor) usage, which allows to take into account the spectral conditions and history of exposure.

            Author and article information

            Carl Hanser Verlag
            27 August 2015
            : 80
            : 4
            : 394-401
            1 Nuclear Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., Moscow, 123182, Russian Federation
            Author notes
            © 2015, Carl Hanser Verlag, München
            : 28 January 2015
            Page count
            References: 4, Pages: 8
            Technical Contributions/Fachbeiträge

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


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