Zvyšování životnosti komponent energetických zařízení v elektrárnách 2018 Collection home page

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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 43
Brabec, Petr , Tonarová, Dana
Využití metalografických replik při nedestruktivní identifikaci materiálu chladících kroužků pro dieselgenerátory JE Dukovany

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...

Marková, Jana , Mlčoch, Jan , Sýkora, Miroslav , Prešl, Kamil , Molnár, Jan
Optimalizace údržby ochranných nátěrů průmyslových komínů a chladících věží

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...

Černý, Miroslav J.
Životnost lopatek parních turbín

Minařík, Jakub , Chuchvalec, Petr , Kec, Jan
Návrh zařízení pro měření hloubky trhlin střídavou potenciálovou metodou

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...

Neumannová, Šárka , Vlasák, Tomáš , Hakl, Jan , Čech, Jan , Havelková, Libuše
Žárupevné vlastnosti martenzitické ocele CB2 v základním stavu a po svaření

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&...

Junek, Michal , Svobodová, Marie , Janovec, Jiří
Vliv krátkodobého degradačního žíhání oceli P92 na změnu mechanických vlastností z hlediska precipitace Lavesovy fáze

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...

Horváth, Ladislav , Horváth, Jakub , Smejkal, Martin , Rohlová, Marie
Příklad nízké vypovídací schopnosti projektových parametrů VT parovodů pro plánování prodlužování životnosti jejich komponent

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.

Polach, Pavel , Černý, Josef , Houdková, Šárka
Energetické centrum kompetence: vybrané výsledky druhé fáze řešení projektu II

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...

Kobzová, Alena , Kronďák, Martin
V&V projekt: turbíny – vývoj metodiky kontroly lopatek s využitím informací z EPRI, etapa M5 – Chemické režimy a nánosy

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&...

Habrcetl, Vlastimil , Mareš, Pavel , Zahrádka, Pavel , Patera, Jan
VaV projekt: turbíny – vývoj metodiky kontroly lopatek s využitím informací z EPRI, etapa M1 A M2

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 ...

Kasl, Josef , Václavík, Jaroslav , Novák, Matyáš , Mrštík, Jakub , Matějová, Miroslava
Projekt VaV ČEZ, A.S. „Turbíny – vývoj metodiky kontroly lopatek s využitím informací z EPRI“ – hodnocení korozních důlků oběžných lopatek NT dílů parních turbín

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...

Kobzová, Alena
Stabilizace cirkulačních chladících vod na EDU

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...

Lukáš, Jiří
Výzkum pro umožnění bezpečného provozu parovodů s makrotrhlinami

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...

Horváth, Jakub , Junek, Michal , Rohlová, Marie , Janovec, Jiří
Dopad vysokoteplotního přehřátí na mikrosturuturní změny degradované ocele super 304H

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...

Veselý, Stanislav
Analýza teplotních napětí plamence spalovací komory a predikce životnosti

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&...

Baľák, Miloš , Petzová, Jana , Adamech, Marek
Teplotné starnutie a jeho monitorovanie v je na Slovensku

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...

Palán, Marek , Ducháček, Petr , Čančura, Zdeněk
Oprava heterogenního svarového spoje parního generátoru č. 25 na jaderné elektrárně Dukovany technologií weld overlay

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...

Ducháček, Petr , Palán, Marek , Čančura, Zdeněk
Orbitální svařování heterogenních svarových spojů ocelí 12022.1 a 08CH18N10T přídavným materiálem typu SV-07CH25N13

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...

Fleischhans, Jiří , Kos, Petr , Švehla, Jan
Predikce prodlužení životnosti detektorů neutronů

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

Ertl, Jakub
Postup hodnocení fluencí rychlých neutronů dopadajících na TNR JE Dukovany

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...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 43