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Papers by Waclaw Gudowski

Research paper thumbnail of Results from pulsed neutron source measurements in the YALINA-Booster ads experiment

Two subcritical configurations of the zero-power coupled subcritical core YALINA-Booster have bee... more Two subcritical configurations of the zero-power coupled subcritical core YALINA-Booster have been identified through pulsed neutron source measurements. The area ratio and the slope fitting reactivity estimation methods have been utilized as well as the pulsed Rossi-�. noise method. The measurements showed that despite the inhomogeneous two-zone core composition a clear single exponential prompt neutron decay was obtained. Spatial spread of the results and converegence issues related to the area ratio method are addressed.

Research paper thumbnail of Comparison of calculated and measured reaction rates obtained through foil activation in the subcritical dual spectrum facility YALINA-Booster

Annals of Nuclear Energy, 2011

Research paper thumbnail of Pulsed neutron source measurements in the subcritical ADS experiment YALINA-Booster

Annals of Nuclear Energy, 2008

Research paper thumbnail of A Liquid Metal as an Extensive Test Case of Static and Dynamic Properties

Springer Proceedings in Physics, 1989

Research paper thumbnail of Evidence for structural effects in self-diffusion

Research paper thumbnail of Comparison of the results of mode-coupling theory for liquid lead at 623 K and 1170 K with molecular dynamics data

Journal of Non-Crystalline Solids, 1993

Abstract The mode-coupling formalism for the memory function of the velocity autocorrelation func... more Abstract The mode-coupling formalism for the memory function of the velocity autocorrelation function formulated roughly 10 years ago by Sjolander, Sjogren and Wahnstrom is believed to describe the dynamical properties of argon and rubidium in the liquid state relatively well. Moreover, mode-coupling theory has been successfully applied to interpret a number of dynamical phenomena observed in a supercooled liquid approaching the liquid-glass transition. The results of a mode-coupling theory limited to four coupling terms and extended to Q -dependent memory functions over the region of 0–6 A −1 are discussed. The comparison with molecular dynamics (MD) data demonstrates that mode-coupling theory overestimates the long-time tail of the second-order memory function and fails to describe correctly the self-motion of liquid lead both at low and high temperature. The self-diffusion coefficient obtained from a mode-coupling calculation is about 25% too low. However, the analysis of the results at two different temperatures indicates that there is a systematic pattern in the discrepancies which suggests a possibility to improve the theoretical approach to match the MD-results.

Research paper thumbnail of Neutronics of a Subcritical System Burning Non-Recycled LWR Waste

We have investigated neutronic properties of a sub-critical system designed for trans- mutation o... more We have investigated neutronic properties of a sub-critical system designed for trans- mutation of non-recycled TRU discharges from commercial light water reactors. Burnable absorbers (BA) and depleted uranium in variable concentrations are introduced in order to maximize fission to absorption ratios, and to minimize power peaking as well as reac- tivity losses. The use of nitride fuel raises linear power ratings to 60-110 kW/m while keeping fuel center line temperatures below 1400 K after gap closure. A comparatively small power peaking of 1.5 at a sub-criticality level of 0.97 allows for a total core power of 1200 MWth with a corresponding proton beam power of 20 MW at BOL. Core averaged fissionto absorption ratios for Np and Am as high as 0.5 are achieved using 10 B enriched B4C as BA. Hence, both Pu and minor actinide inventories are reduced during burnup in the here proposed system, mitigating swelling problems arising due to high -activity in MA-based fuels. Disadvantages foll...

Research paper thumbnail of Results from pulsed neutron source measurements in the YALINA-Booster ads experiment

Two subcritical configurations of the zero-power coupled subcritical core YALINA-Booster have bee... more Two subcritical configurations of the zero-power coupled subcritical core YALINA-Booster have been identified through pulsed neutron source measurements. The area ratio and the slope fitting reactivity estimation methods have been utilized as well as the pulsed Rossi-�. noise method. The measurements showed that despite the inhomogeneous two-zone core composition a clear single exponential prompt neutron decay was obtained. Spatial spread of the results and converegence issues related to the area ratio method are addressed.

Research paper thumbnail of Comparison of calculated and measured reaction rates obtained through foil activation in the subcritical dual spectrum facility YALINA-Booster

Annals of Nuclear Energy, 2011

Research paper thumbnail of Pulsed neutron source measurements in the subcritical ADS experiment YALINA-Booster

Annals of Nuclear Energy, 2008

Research paper thumbnail of A Liquid Metal as an Extensive Test Case of Static and Dynamic Properties

Springer Proceedings in Physics, 1989

Research paper thumbnail of Evidence for structural effects in self-diffusion

Research paper thumbnail of Comparison of the results of mode-coupling theory for liquid lead at 623 K and 1170 K with molecular dynamics data

Journal of Non-Crystalline Solids, 1993

Abstract The mode-coupling formalism for the memory function of the velocity autocorrelation func... more Abstract The mode-coupling formalism for the memory function of the velocity autocorrelation function formulated roughly 10 years ago by Sjolander, Sjogren and Wahnstrom is believed to describe the dynamical properties of argon and rubidium in the liquid state relatively well. Moreover, mode-coupling theory has been successfully applied to interpret a number of dynamical phenomena observed in a supercooled liquid approaching the liquid-glass transition. The results of a mode-coupling theory limited to four coupling terms and extended to Q -dependent memory functions over the region of 0–6 A −1 are discussed. The comparison with molecular dynamics (MD) data demonstrates that mode-coupling theory overestimates the long-time tail of the second-order memory function and fails to describe correctly the self-motion of liquid lead both at low and high temperature. The self-diffusion coefficient obtained from a mode-coupling calculation is about 25% too low. However, the analysis of the results at two different temperatures indicates that there is a systematic pattern in the discrepancies which suggests a possibility to improve the theoretical approach to match the MD-results.

Research paper thumbnail of Neutronics of a Subcritical System Burning Non-Recycled LWR Waste

We have investigated neutronic properties of a sub-critical system designed for trans- mutation o... more We have investigated neutronic properties of a sub-critical system designed for trans- mutation of non-recycled TRU discharges from commercial light water reactors. Burnable absorbers (BA) and depleted uranium in variable concentrations are introduced in order to maximize fission to absorption ratios, and to minimize power peaking as well as reac- tivity losses. The use of nitride fuel raises linear power ratings to 60-110 kW/m while keeping fuel center line temperatures below 1400 K after gap closure. A comparatively small power peaking of 1.5 at a sub-criticality level of 0.97 allows for a total core power of 1200 MWth with a corresponding proton beam power of 20 MW at BOL. Core averaged fissionto absorption ratios for Np and Am as high as 0.5 are achieved using 10 B enriched B4C as BA. Hence, both Pu and minor actinide inventories are reduced during burnup in the here proposed system, mitigating swelling problems arising due to high -activity in MA-based fuels. Disadvantages foll...

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