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Radiation damage of VVER-440 based Dukovany NPP reactor pressure vessel investigation
Říha, Tomáš ; Martinec, Jiří (referee) ; Šen, Hugo (advisor)
This master‘s thesis deals with radiation damage of reactor pressure vessels, specifically of NPP Dukovany Unit No. 3. In general damage mechanisms of reactor steels are described and possibilities of monitoring of material degradation and its recovery used at NPP’s all over the world are mentioned as well. A practical part of the thesis is focused on interpretation of analyses carried out with the assistance of MOBY DICK code. The ground of these analyses is a neutron fluence value development on different locations of RPV for the whole life of operation up to 24th cycle. The analyses results are put into context with performed in-service inspections. The thesis follows up with neutron fluence computation for the future cycles containing new types of nuclear fuel up to 34th cycle. The outcome of practical part of the master‘s thesis is a comparison between new types of nuclear fuel with respect to radiation damage of RPV’s.
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High temperature service embrittlement of EUROFER´97 steel
Stratil, Luděk ; Jan, Vít (referee) ; Hadraba, Hynek (advisor)
The thesis describes effect of long-time ageing on the microstructure and properties of the Eurofer´97 steel. The ferritic-martensitic reduced activation steel Eurofer´97 is candidate structural material for in-core components of proposed fusion reactors. Thesis is focused on examination and description of brittle-fracture behaviour of the steel. Properties of the steel were investigated in as-received state and state after long-time ageing. Detailed microstructure studies were carried out by means of optical and electron microscopy and also by means of quantitative electron microscopy. Mechanical properties were evaluated also in both states by means of hardness tetsing, tensile testing and Charpy impact testing. Fractography analysis of fracture surfaces was carried out on samples after Charpy impact testing.
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Study of Radiation Damage in Silicon Strip Detector for ATLAS ITk
Zatočilová, Iveta ; Mikeštíková, Marcela (advisor) ; Marčišovská, Mária (referee)
Ionizing radiation causes bulk and surface damages in silicon detectors. The significant bulk damage is caused also by neutrons. Those damages in- fluence the detection performance of silicon strip detectors. The main purpose of this thesis is to study the effects of radiation damage in silicon strip sen- sors by performing electrical tests on them. Tested silicon strip sensors were designed for the replacement of the current Inner Detector of the ATLAS ex- periment by a new all-silicon Inner Tracker. This replacement is needed because of the upgrade of the Large Hadron Collider (LHC) into the High-Luminosity LHC. 1
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Study of Radiation Damage in Silicon Strip Detector for ATLAS ITk
Zatočilová, Iveta ; Mikeštíková, Marcela (advisor) ; Marčišovská, Mária (referee)
Ionizing radiation causes bulk and surface damages in silicon detectors. The significant bulk damage is caused also by neutrons. Those damages in- fluence the detection performance of silicon strip detectors. The main purpose of this thesis is to study the effects of radiation damage in silicon strip sen- sors by performing electrical tests on them. Tested silicon strip sensors were designed for the replacement of the current Inner Detector of the ATLAS ex- periment by a new all-silicon Inner Tracker. This replacement is needed because of the upgrade of the Large Hadron Collider (LHC) into the High-Luminosity LHC. 1
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Radiation damage of VVER-440 based Dukovany NPP reactor pressure vessel investigation
Říha, Tomáš ; Martinec, Jiří (referee) ; Šen, Hugo (advisor)
This master‘s thesis deals with radiation damage of reactor pressure vessels, specifically of NPP Dukovany Unit No. 3. In general damage mechanisms of reactor steels are described and possibilities of monitoring of material degradation and its recovery used at NPP’s all over the world are mentioned as well. A practical part of the thesis is focused on interpretation of analyses carried out with the assistance of MOBY DICK code. The ground of these analyses is a neutron fluence value development on different locations of RPV for the whole life of operation up to 24th cycle. The analyses results are put into context with performed in-service inspections. The thesis follows up with neutron fluence computation for the future cycles containing new types of nuclear fuel up to 34th cycle. The outcome of practical part of the master‘s thesis is a comparison between new types of nuclear fuel with respect to radiation damage of RPV’s.
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High temperature service embrittlement of EUROFER´97 steel
Stratil, Luděk ; Jan, Vít (referee) ; Hadraba, Hynek (advisor)
The thesis describes effect of long-time ageing on the microstructure and properties of the Eurofer´97 steel. The ferritic-martensitic reduced activation steel Eurofer´97 is candidate structural material for in-core components of proposed fusion reactors. Thesis is focused on examination and description of brittle-fracture behaviour of the steel. Properties of the steel were investigated in as-received state and state after long-time ageing. Detailed microstructure studies were carried out by means of optical and electron microscopy and also by means of quantitative electron microscopy. Mechanical properties were evaluated also in both states by means of hardness tetsing, tensile testing and Charpy impact testing. Fractography analysis of fracture surfaces was carried out on samples after Charpy impact testing.
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The effect of ionizing radiation on the complex of estrogen receptor with DNA
Štísová, Viktorie ; Běgusová, Marie
Estrogen receptor protein forms a specific complex with DNA bearing estrogen response element. The study of the effect of ionizing radiation on the stability of the complex is presented. Method of agarose gel electrophoresis was used to follow radiomodifying effects of estrogen, which is in conditions in vivo necessary for complex formation. Method of retardation polyacrylamide electrophoresis was used to determine overall stability of the complex as a function of absorbed dose.
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