The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Marc Legros - One of the best experts on this subject based on the ideXlab platform.
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extended defect change in uo2 during in situ tem annealing
Acta Materialia, 2020Co-Authors: C Onofri, C Sabathier, Cedric Baumier, C Bachelet, D Drouan, Marie Gerardin, Marc LegrosAbstract:Abstract Predicting the nuclear fuel microstructure at each moment of its irradiation cycle (Nominal, Power transient, accidental conditions) is a significant nuclear safety issue. For that, it is necessary to understand the impact of irradiation parameters on the microstructure. This study provides insight about the temperature effect on dislocations. In situ thermal annealing up to 1400°C on pre-irradiated polycrystalline UO2 thin foils was performed inside a TEM for the first time. The aim of the current study is to establish the kinetic and the mechanisms of thermal recovery of extended defects induced by irradiation. Whatever the initial irradiation conditions, extended defect recovery was observed around 1000-1100°C, in good agreement with literature data. Dislocation line disappear mainly by climb and dislocation loops move by pencil glide along the Burger vector directions. Defect growth by coalescence of dislocation loops is also observed.
C Onofri - One of the best experts on this subject based on the ideXlab platform.
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extended defect change in uo2 during in situ tem annealing
Acta Materialia, 2020Co-Authors: C Onofri, C Sabathier, Cedric Baumier, C Bachelet, D Drouan, Marie Gerardin, Marc LegrosAbstract:Abstract Predicting the nuclear fuel microstructure at each moment of its irradiation cycle (Nominal, Power transient, accidental conditions) is a significant nuclear safety issue. For that, it is necessary to understand the impact of irradiation parameters on the microstructure. This study provides insight about the temperature effect on dislocations. In situ thermal annealing up to 1400°C on pre-irradiated polycrystalline UO2 thin foils was performed inside a TEM for the first time. The aim of the current study is to establish the kinetic and the mechanisms of thermal recovery of extended defects induced by irradiation. Whatever the initial irradiation conditions, extended defect recovery was observed around 1000-1100°C, in good agreement with literature data. Dislocation line disappear mainly by climb and dislocation loops move by pencil glide along the Burger vector directions. Defect growth by coalescence of dislocation loops is also observed.
Dalibor Cervinka - One of the best experts on this subject based on the ideXlab platform.
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Increasing the Efficiency of Induction Generator in Small Hydro Power Plant for Varying River Flow Rate
Advances in Intelligent Systems and Computing, 2017Co-Authors: Ondrej Rubes, Dalibor CervinkaAbstract:This paper deals with improving efficiency of a small hydro Power plant that not operates in Nominal Power, but in lower Power. Efficiency is lower in this low Power operation than in Nominal Power operation since constant no-load losses. These no-load losses can be varied by changing stator voltage and it may produce higher efficiency. Relation between efficiency, Power operation and stator voltage are presented and the highest possible efficiency is highlighted. This process is made for typical 15 kW small hydro Power plant with horizontal Francis turbine. Finally, there is comparison between original efficiency of generator and improved efficiency with corresponding stator voltage and one year Power savings.
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Efficiency optimization of small hydro Power plant in low Power operation
2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC I&CPS, 2017Co-Authors: Ondrej Rubes, Dalibor CervinkaAbstract:This paper deals with a low Power operation of small hydro Power plants. It is typical for small hydro Power plants on small rivers without reservoirs where the Power in low season is less than one-third of Nominal Power. That is why the efficiency is decreased. The generator has low efficiency in this operation due to constant no load losses. The analysis of losses is presented and possible improvements are suggested. The last part of this paper presents a simple method of reducing no load losses, calculation of the Power savings and experimental validation of this method.
D Drouan - One of the best experts on this subject based on the ideXlab platform.
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extended defect change in uo2 during in situ tem annealing
Acta Materialia, 2020Co-Authors: C Onofri, C Sabathier, Cedric Baumier, C Bachelet, D Drouan, Marie Gerardin, Marc LegrosAbstract:Abstract Predicting the nuclear fuel microstructure at each moment of its irradiation cycle (Nominal, Power transient, accidental conditions) is a significant nuclear safety issue. For that, it is necessary to understand the impact of irradiation parameters on the microstructure. This study provides insight about the temperature effect on dislocations. In situ thermal annealing up to 1400°C on pre-irradiated polycrystalline UO2 thin foils was performed inside a TEM for the first time. The aim of the current study is to establish the kinetic and the mechanisms of thermal recovery of extended defects induced by irradiation. Whatever the initial irradiation conditions, extended defect recovery was observed around 1000-1100°C, in good agreement with literature data. Dislocation line disappear mainly by climb and dislocation loops move by pencil glide along the Burger vector directions. Defect growth by coalescence of dislocation loops is also observed.
C Sabathier - One of the best experts on this subject based on the ideXlab platform.
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extended defect change in uo2 during in situ tem annealing
Acta Materialia, 2020Co-Authors: C Onofri, C Sabathier, Cedric Baumier, C Bachelet, D Drouan, Marie Gerardin, Marc LegrosAbstract:Abstract Predicting the nuclear fuel microstructure at each moment of its irradiation cycle (Nominal, Power transient, accidental conditions) is a significant nuclear safety issue. For that, it is necessary to understand the impact of irradiation parameters on the microstructure. This study provides insight about the temperature effect on dislocations. In situ thermal annealing up to 1400°C on pre-irradiated polycrystalline UO2 thin foils was performed inside a TEM for the first time. The aim of the current study is to establish the kinetic and the mechanisms of thermal recovery of extended defects induced by irradiation. Whatever the initial irradiation conditions, extended defect recovery was observed around 1000-1100°C, in good agreement with literature data. Dislocation line disappear mainly by climb and dislocation loops move by pencil glide along the Burger vector directions. Defect growth by coalescence of dislocation loops is also observed.