The results of failure analysis of two cases of cooling insert damage inside dieselgenerator ́s engines, operated in Dukovany NPP, induced a need of positive material identification of spare parts by nondestructive evaluation method. Material identification on the base of microstructu...

The study investigates the effect of protective coatings on the service life of reinforced concrete chimneys and cooling towers. Probabilistic methods and carbonation depth measurements make it possible to predict carbonation ingress and development of corrosion, and adapt maintenance plan...

Potential Drop (PD) techniques have been used for decades, especially in mechanical laboratories for monitoring crack growth. During the test AC/DC currents are injected in the specimen. Defects generally increases local resistance and hence the measured voltage drop. The PD...

This paper describes creep properties of CB2 steel. These properties are almost absent in the available literature. In SVUM, a.s. was tested the material produced by ŽĎAS, a.s. Shortterm mechanical properties and long-term creep properties of the base material were tested during&...

The paper deals with the evaluation of the influence of short-term laboratory ageing (650 °C, 100 to 20 000 hours) of martensitic steel P92 in view of ongoing microstructural changes. During thermal exposure process, a coarsening of the carbide particles and precipitation of...

Generalized procedure for boilers and high pressure vessel lifetime assessment is usage of creep data and roughly the same operation time between boilers. This paper present results that this procedure is not always possible to use.

The paper presents in brief two selected results of the Competence Centre Project of Technology Agency of the Czech Republic “Centre of research and experimental development of reliable energy production” achieved in 2017: developed equipment and methods for contactless magnetic inspe...

Work package M5 focused on chemical treatment in fossil plants of ČEZ company and evaluation of deposit on the blade surface with the aim to minimalize initiation and development of pitting. Useful information and recommendations of EPRI for water chemistry of operation and&...

This paper deals with two stages of the R&D project: Turbines – development of blade control methodology using EPRI information. The aim of the first stage was to find a suitable method for detecting and determining the dimensions of the corrosion pits that may ...

The aim of this contribution is to introduce a motivation and goals of the R&D project of ČEZ, a.s. “Turbines – The Development of a Steam Turbine Blades Checking using EPRI information”, which is focused on the development of a predictive methodology of the as...

The aim of this R&D project was an analytical treatment of chemical-technologist bases for agent sampling to open cooling water systems which is interconnected with essential service water systems in NPP Dukovany. The objectives are reduction of corrosion in piping of essenti...

The paper describes the internal CEZ R & D project, which aimed at obtaining a procedure for evaluating the life-time of the steam pipelines with crack occurrence and obtaining diagnostic procedures for its monitoring. There is presented the task when, the crack with limi...

This paper documents the microstructure changes of steel SUPER 304H caused by high temperature overheating (1140 °C, 15 hours). The experimental material was firstly isothermally laboratory exposed about 30,000 hours at temperature 650 °C and then subject to high temperature ove...

The most thermally stressed parts of combustion turbines are functional parts of combustion chambers. That is due to thermal radiation of the flame to the wall and substantial convection from inner and outer side of the flame tube. This creates non-uniform temperature field&...

The thermal ageing monitoring of nuclear power plant primary circuit materials is the issue solved only since 2010. Monitoring of this degradation process is necessary in aspect of NPPs long-term operation as one from the main material degradation process of the safety impor...

The paper describes the way of choosing the method, qualification process and implementation of the repair of the dissimilar metal weld. Weld is on the superemergency feed water system of the steam generator No° 25 at the NPP Dukovany (type VVER 440 MW). This is &#x...

The paper provides the results of the non-destructive and destructive exams which were made during the qualifications of orbital welding of dissimilar weld joints in steels 12022.1 ÷ 08Ch18N10T filler material Sv-07Ch25N13. The paper contains also the comparison with the results...

Methods and results of prediction residual lifetime are presented in the paper

Determination of neutron fluence affecting RPV in Dukovany NPP is a part of ageing management program because the lifetime of RPV is negatively influenced by absorption of fast neutrons. Neutron fluence causes increase of RPV transition temperature and thus also the probabi...