The thesis deals with the knowledge of the population about the nuclear disaster at Fukushima in the Vysočina Region. The goal is to determine the level of knowledge of population about the accident and then compare the knowledge of people aged 18-44 years and older than 45 years. In the thesis were set two hypotheses, H1: the knowledge of the population in the nuclear accident will be close to normal distribution and H2: people under 45 years will have statisticly higher knowledge than older people. To achieve the setted goals and to test the hypotheses, a questionnaire was compiled and a survey was made. The results of the survey were evaluated by methods of descriptive and mathematical statistics. The questionnaire consisted of 11 questions. The survey consisted of 100 people aged 18-44 years and 100 people aged over 45 years. The results of the survey show that the overall percentage of correctly answered questions was 63,3 %, which can be considered slightly above average. 66,1 % of people aged 18-44 years answered the questions correctly and residents over the age of 45 years 60,6 % correctly. The set goals were achieved and both hypotheses were confirmed. The benefit of this thesis is to obtain a picture of knowledge of public in the nuclear disaster at Fukushima in the Vysočina Region. The results can also be used for crisis management authorities within the preparation and preventive educational activities focused on the issue of nuclear energy and radiation protection.

The utilisation of nuclear energy entails, like any other human activity, risk of occurrence of accidents and emergencies. On Saturday 26th April 1986 early morning in the fourth block of the Chernobyl nuclear power plant in Ukraine occurred the biggest industrial accident in the peace usage of nuclear energy. It led to a vast leakage of radioactive debris to the wide surrounding area. An accident of such extent has never been thought possible before and it has surprised national authorities responsible for emergency preparedness practically in all counties operating nuclear power plants. It was crucial to prepare and introduce many countermeasures to restrict exposure of persons and environment to radiation. The most affected countries have been today{\crq}s Byelorussia, Russia and Ukraine. Although international instructions and criteria for failure actions had existed even before the Chernobyl accident, the experience with their application was very limited. Needless to say, some short-term countermeasures had been neglected or insufficiently realised. Inhabitants were not informed about the accident in time and therefore they hid late. Also iodine prophylaxis did not start in time, which led to unnecessarily high irradiation of thyroid gland. The evacuation was, in view of decreasing external exposure, executed within possibilities efficiently. As for the long-term countermeasures related not only to the liquidation of the aftermath of the accident in the area of the nuclear power plant but especially the decontamination works in residential units and on contaminated soils, regulation of food chains and relocation of persons from the affected areas, preventive and health care of the inhabitants living in the contaminated territory - these measures were massive in scope and in principle mostly reasoned and effective. Unfortunately, the effectiveness of some of these measures was somewhat deteriorated by the fact they were introduced area-wide (only on the basis of the surface contamination and not on the estimation of exposure from whole-body measurements), were not fully substantiated and later had to by cancelled for economical reasons. Not only economical factors play an important role in the planning and application of the countermeasures (mainly long-term ones). Without question it is necessary to secure that the measures can be applied in the contaminated areas in view of their effectiveness in sufficient extent for time long enough and after a thorough evaluation of all pros and cons, expenses and gains. As well, it is needed to take into consideration the effect of social and psychological factors, where in practise a satisfactory progress has not been made yet. Many studies proved that the introduction of countermeasures affects the increase of psychosocial tension among the involved people. This negative attitude results from the public{\crq}s lack of information about radiation and about the possibilities of its reduction and consequent fear and anxiety due to the uncertainty regarding future. Because of the concealment of information about the Chernobyl accident, also distrust of citizens against authorities has remained to be a problem. However, the approach of public is very important in regard to the effectiveness of countermeasures. In order that the measures would be accepted as well as possible, it is needed to secure corresponding education programs and to engage public into discussions and decision-making within the introduced measures.

In this thesis I target the assesment of a volume activity of gamma ray nuclides in the environment and the examination of the operation the Nuclear Power Station (NPS) Temelín in term of emitting the gamma ray nuclides and their environmental impact. There were collected data of several sorts of environmental samples for statistical analysis. The activity of gamma ray nuclides released by nuclear power plants to the environment after its initiation was compared to the activity of gamma ray nuclides contained it the environment before the initiation of the NPS. It was chosen five exemplary samples - , aerosoles, sediments, milk, soil and surface moisture, which have been scanning in years 1995 and 2005. In these samples, that have sufficient amount of data (sorts of milk, aerosoles and surface moisture) so the statistical analysis was relevant, it was proved, by the non-parametrical Mann-Whitney statistical testing, that there were no statistical difference between the data before and after the initiation of the NPS. The environmental impact wasn´t demonstrated. In these samples, that haven´t sufficient amount of data (sediments and soil), they were also tested (parametrical t. test) and it was proved that there were no statistical difference between the data before and after the initiation of the NPS. Because of very low quality of the testing, we have to use the box plot to ascertain the influence of NPS. In these plots the environmental impact wasn´t demonstrated as well.

This thesis deals with the topic of nuclear energy. The Czech Republic is currently a net electricity exporter however this status will probably change in next few years because of growing electricity consumption and decommissioning of obsolete coal-fired power plants. Moreover, contemporary government declared that it won't approve any construction of new reactors stressing the importance of renewable sources of energy (in spite of their limited potential in the Czech Republic). The goal of this thesis is to answer the question whether nuclear energy can compete with other sources of energy and whether is it possible to satisfy growing electricity consumption under the conditions of the Czech Republic by any other source of electricity besides nuclear energy taking into account environmental aspects.

The events of the recent past in the energy department in Europe have shown how big is it's dependency on import of the primary energy resources. In the long run it is obvious that a high dependency on import of resources with the increasing demand of the population will not be able to provide Europe with so much needed easy accessible and reasonably priced energy. The integration process in Europe lasts more than fifty years now but energy policy is even after the ratification of the Lisbon treaty in controll of the national parlaments of member countries. Even though the options and posibilitie of the countries differ in the long run a closer cooperation is mandatory. The thesis is about the united energy policy in Europe and the development it went through since the beginning of the integration process in the fifties of last century. I will describe the main events that formed it as well as the main resources of energy production in the EU. I will explain the term energy security and in the end I will write about nuclear power that is today a vary efficient but after the events of Fukushima also controversial alternative of energy independence.

This diploma thesis deals with activities of the Czech ecological organisations which were active in case of nuclear power plant Temelin after its breaking-in. The thesis is divided into four chapters. The first one focuses on the definition of the ecological organisation (movement). In the second chapter, the attention is paid to the history of foundation and functioning of the nuclear power plant Temelin. The third chapter is about advantages and disadvantages of the nuclear power. The last chapter focuses on the analysis of activities of the Czech ecological organisations which opposed or supported the nuclear power plant Temelin.

The topic of this work is the renewal of hermetic pipe penetrations within the primary loop of a nuclear power station. A description of the Dukovany nuclear power plant is included at the beginning, ranging from basic description to details of the renewed component and the reasoning for its replacement. Following is a description of the technologies, which are applied in order to restore the hermetic pipes, the choice of the placement of the heterogeneous weld and the compilation of a workflow for the renewal in the environment of the primary loop while maintaining the quality standards and the strict safety conditions. The conclusion includes a calculation of the expenses tied with the chosen variant the reasoning behind the renewal regarding the length of the outage.

The subject of this work is the repair of an air-handling unit. Possible causes of the problem are analyzed and multiple solutions are proposed. The first variant considers the refurbishment of the damaged component using thermal spray technology, including the choice of the best method. The second solution proposes the manufacture of a new part using machining in the environment of the company. This process requires an intermediate product to be made, and the choice of the correct machines from what the company has available, choice of the right tools and cutting conditions. The technical-economical evaluation compares the the expenses tied with both of the solutions. The chosen repair solution was used for the repair of the air-handling unit.

The goal of this thesis is to simulate the course of events during Dukovany Nuclear Power Plant blackout and to determine the optimal process of cooling down the cold branches of the primary circuit loops to secure the maximum amount of the primary fuel needed for the residual heat outlet so that the operating staff has as much time as possible for renewing the electric power supply. The first part of the thesis describes nuclear power plants built in the Czech Republic and in the world as well as reactor blocks whose construction is being considered. The detailed description of Dukovany’s steam generator is shared in chapter three. Following chapter summarizes blackouts that occurred at power plants around the world, events that might have led to blackouts in the Czech Republic, and it also describes current approach to blackout problematics at Dukovany Nuclear Power Plant. Chapters six and seven contain the core of the thesis. That includes detailed description of a mathematical model explaining the behaviour of a reactor block during blackout as well as the analysis of the results found.

This thesis deals with the idea of using accelerator driven systems for thorium transmutation into the fissile material, which can be utilized in the accelerator driven systems and in thermal nuclear reactors. Thorium occurs on Earth only in fertile isotope Th-232. It can be converted to fissile U-233 by neutron capture and subsequent beta decay. The experimental part handles the data measured by the irradiation of four thorium samples by the secondary neutrons in the QUINTA spallation target, which was irradiated with 660~MeV protons. Reaction rates for the fission and spallation products were estimated using gamma spectroscopy and activation techniques. Furthermore, Pa-233 production rates were also determined in all experimental samples. Pa-233 and fission production rates were calculated in all experimental samples using the MCNPX transport code and evaluated nuclear data for high-energy reactions. The experimental results are of a great importance for the future investigation of thorium in the accelerator driven system concept, validation of Monte-Carlo based calculation codes and validation of high-energy nuclear models.