Nuclear fuel failures during the reactor operation happen quite often in the world. The theoretical part of this thesis is dedicated to the most common causes of nuclear fuel failures. It describes failure mechanism and corrective actions. The unfavorable trends in nuclear fuel behavior are prevented by suitable method of nuclear fuel monitoring. Some of them may affect the safety of the power plant. For example, the fuel assembly bow affects the function of rod cluster control assembly. Another part, which describes inspection methods, is devoted to inspection and repair of nuclear fuel. The thesis concentrates on the Temelin NPP, where there was implemented post-irradiation inspection program for checking compatibility between Westinghouse's fuel assemblies and water chemistry of reactor VVER. This program continues even after the change of nuclear fuel supplier. Practical part of this thesis is dedicated to proposal of a new method of fuel assembly bow measurement for Temelin NPP based on ultrasound. This proposal is supported by measurement on the experimental device for detection of spacer grid position developed by Research Centre Rez.

This thesis deals with the technical and economic evaluation of tractor transport kits. The first part is indicated the current situation in construction of tractors and there is, more detailed description of structural elements of tractors NewHolland T7050 PowerCommand and AutoCommand. In the second part there is the methodology of laboratory measurements and their subsequent evaluation. The third part deals with the field measurements, where is described the detailed profile of the test track and measurement methodology. At the end the measured data were given into the tabular and graphical form and finally evaluated. The evaluation of the data shows that the transmission is suitable for transports. The thesis came to the conclusion about which kit had the best results according the conditions.

Farm tractors are used in various works that is the reason why manufacturers equip the tractors with engines with outputs from 30 to 450 kW, mechanical or hydro mechanical gearboxes and tires with various acceptable inflation pressures and dimensions. Many types of tires which are available for agricultural tractors, places higher requests on the knowledge of the transfer of power from the tires on a surface. What is the impact of different design of tires transmission on output power or fuel consumption can be determined, for example, make a field measurements. Results of field measurement shows that tire inflation and type of tires has significant effect on pull performance slip and fuel consumption.

The purpose of this thesis was first to make a survey of compressed natural gas and its characteristic properties, matters relating to safety, environmental impact, and other issues associated with the use of this fuel. Furthermore, this work also addresses economic analysis of vehicle performance of operating vehicles on compressed natural gas of selected company. A new car fleet was created from the data provided from the selected company. The operational efficiency of compressed natural gas was detected and compared to results with conventional liquid fuels such as automotive gasoline and diesel fuel. Furthermore, the calculation of operating costs was made and the calculated return of investment associated with the use of compressed natural gas to power motor vehicles.

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