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Licensed Unlicensed Requires Authentication Published by De Gruyter December 18, 2014

Burnup analysis of the VVER-1000 reactor using thorium-based fuel

Abbrandanalyse eines VVER-1000 Reaktors mit einem auf Thorium basierenden Brennstoff
M. E. Korkmaz, O. Agar and E. Büyüker
From the journal Kerntechnik

Abstract

This paper aims to investigate 232Th/233U fuel cycles in a VVER-1000 reactor through calculation by computer. The 3D core geometry of VVER-1000 system was designed using the Serpent Monte Carlo 1.1.19 Code. The Serpent Code using parallel programming interface (Message Passing Interface-MPI), was run on a workstation with 12-core and 48 GB RAM. 232Th/235U/238U oxide mixture was considered as fuel in the core, when the mass fraction of 232Th was increased as 0.05–0.1–0.2–0.3–0.4 respectively, the mass fraction of 238U equally was decreased. In the system, the calculations were made for 3 000 MW thermal power. For the burnup analyses, the core is assumed to deplete from initial fresh core up to a burnup of 16 MWd/kgU without refuelling considerations. In the burnup calculations, a burnup interval of 360 effective full power days (EFPDs) was defined. According to burnup, the mass changes of the 232Th, 233U, 238U, 237Np, 239Pu, 241Am and 244Cm were evaluated, and also flux and criticality of the system were calculated in dependence of the burnup rate.

Kurzfassung

Ziel dieser Arbeit ist die Untersuchung von 232Th/233U Brennstoffzyklen in einem VVER-1000 Reaktor mit Hilfe von Computerberechnungen. Die 3D Kerngeometrie des VVER-1000 Systems wurde ausgeführt mit Hilfe des Serpent Monte Carlo 1.1.19 Codes. Die Berechnungen mit Hilfe des Serpent Codes, der parallele Programmschnittstellen (Message Passing Interface-MPI) verwendet, wurden mit einer Workstation mit 12-Core and 48 GB RAM durchgeführt. Als Brennstoff wurde ein 232Th/235U/238U Oxidgemisch verwendet bei Erhöhung des Massenanteils von 232Th in Schritten von jeweils 0.05–0.1–0.2–0.3–0.4. Der Masseanteil von 238U wurde gleichermaßen verringert. In diesem System wurden die Berechnungen für eine thermische Leistung von 3 000 MW durchgeführt. Für die Abbrandanalyse wird angenommen, dass der anfangs frische Kern bis zu einem Abbrand von 16 MWd/kgU abgereichert wird. Bei den Berechnungen wurde ein Abbrandinterval von 360 effektiven Volllasttagen festgelegt. In Abhängigkeit vom Abbrand wurden die Massenänderungen von 232Th, 233U, 238U, 237Np, 239Pu, 241Am und 244Cm ausgewertet. Flussdichte und Kritikalität des System wurden berechnet in Abhängigkeit von der Abbrandrate.


* Corresponding author: E-mail:

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Received: 2014-09-29
Published Online: 2014-12-18
Published in Print: 2014-12-18

© 2014, Carl Hanser Verlag, München

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