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1

Assessment of the control rods shadow effect in the VENUS-F core

Cetnar J., Domańska G., Gajda P., Janczyszyn J.

Nukleonika

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2014

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Vol. 59, No. 4

137--143

EN

The partitioning and transmutation (P&T) of spent nuclear fuel is an important fi eld of present development of nuclear energy technologies. One of the possible ways to carry out the P&T process is to use the accelerator driven systems (ADS). This technology has been developed within the EURATOM Framework Programmes for several years now. Current research in this fi eld is carried out within the scope of 7th FP project FREYA. Important parts of the project are experiments performed in the GUINEVERE facility devoted to characterising the subcritical core kinetics and development of reactivity monitoring techniques. The present paper considers the effects of control rods use on the core reactivity. In order to carry out the evaluation of the experimental results, it is important to have detailed core characteristics at hand and to take into consideration the differences in the effect of control rods acting separately or together (the so-called shadow effect) on both the reactivity value and the measured neutron fl ux. Also any core asymmetry should be revealed. This goal was achieved by both MCNP simulations and the experimental results. However, in the case of experimental results, the need for calculating respective correction factors was unavoidable.

2

Correction methods for pulsed neutron source reactivity measurement in accelerator driven systems

Gajda P., Janczyszyn J., Pohorecki W.

Nukleonika

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2013

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Vol. 58, No. 2

287--293

EN

Important issue in the perspective of nuclear energy development in the near future is the partitioning and transmutation (P&T) of spent nuclear fuel. For years the European Commission (EC) has sponsored this scientific activity through the Framework Programmes (FP). One of the milestones for P&T is the development of accelerator driven systems (ADS). Extensive research in this field was carried out within the EUROTRANS project of 6th FP of EURATOM. Part of this research was devoted to testing and development of reactivity monitoring techniques in ADS. This paper concerns the methods of the reactivity measurement using the pulsed neutron source (PNS). Due to the fact that basic methods devoted to determine the core reactivity are derived from point kinetics, while real subcritical core kinetics differs from this model, there is a need to improve these methods in order to deal with the observed spatial effects. There are several ways to make these methods work properly and finally it should be possible to achieve this. However, they still need a validation which is supposed to be done within next FP project FREYA.

3

Cykl torowy jako przyszła alternatywa energetyczna

Janczyszyn J.

Archiwum Energetyki

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1998

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T. 27, nr 3/4

79-96

PL

Artykuł jest poświęcony przyszłej roli energetyki jądrowej opartej na paliwie torowym, ze szczególną uwagą zwróconą na systemy sterowane akceleratorem. Omówiono własności Th jako materiału rodnego i 233U jako paliwa, podkreślając ich zalety i wady. Przypomniano historię oraz nakreślono stan obecny i perspektywy stosowania Th w energetyce jądrowej. Zaprezentowano krótko najnowsze koncepcje podkrytycznych układów sterowanych akceleratorem omawiając ich zakres zastosowań, od transmutacji odpadów jądrowych poczynając na redukcji zapasów Pu kończąc.

EN

The paper is devoted to the future role of nuclear power based on thorium as a fuel with particular attention paid to the accelerator-driven systems. Characteristics of Th as a fertile material and 233U as fissile one are discussed and their advantages and disadvantages are pointed out. History of the nuclear power application of Th is reminded and its present state and future perspectives are outlined. Also the newest concepts of subcritical accelerator-driven systems are briefly presented with the discussion of their fields of application, from nuclear power waste transmutation to plutonium surplus reduction.