The article provides information on the results of R&D projects of CVŘ solved in 2022 within the NCK project for energy, subproject DP28 "Materials and diagnostic for advanced energy applications", work package PB28.1 "Surface treatment of components in NPPs and &#x...

Radial tilt-pad journal bearings are used to support machinery with journals of high circumferential speed. A unique design of these bearings prevents the formation of oil-induced instability. However, the design allows for so-called pad spragging and fluttering, which can damage bearing&#x...

In the core of a nuclear reactor, hydrogen is mainly produced by radiolysis of water, which is preferably separated from the primary medium in the Pressurizer. However, hydrogen is an undesirable gas, as it is an excellent thermal insulator and is explosive when combine...

Supercritical carbon dioxide (sCO2) power cycles are characterized by enhanced efficiency in heat to electricity conversion. Another advantage is the compact size of the components of the cycle (e.g., turbine). SCO2 power cycles can be used in both nuclear and non-nuclear e...

The main goal of the project is to evaluate the long-term exposure of the structural cement concrete of spent fuel pools (BSVP) with drainage solution of BSVP and its effect on mechanical properties of the cement concrete for NPP Dukovany and NPP Temelín.

Odolnosť proti korózii prevádzkovaných komponentov je jednou z najdôležitejších podmienok dlhodobého, ale hlavne bezpečného prevádzkovania všetkých jadrových zariadení, zariadenia určené pre skladovanie rádioaktívnych odpadov nevynímajúc. Je to jedným z dôvodov pre zavádzanie rôznych koróznych monitorovacích progra...

Dlhodobá prevádzka jadrových blokov vyžaduje splnenie mnohých podmienok tak, aby bola zaistená ich bezpečná prevádzka aj po presiahnutí pôvodnej plánovanej doby prevádzky. Medzi tieto podmienky patrí aj dlhodobá korózna odolnosť konštrukčných materiálov primárneho okruhu, ktorá má svoje špecif...

Eurofer-97 is considered a potential structural material for GEN IV reactors, and its properties and ability to withstand the given environment are assessed. An essential part of the research is verifying the corrosion behaviour in a liquid metal environment. The aim of the work&#x...

The aim of depositing a coating using the so-called Cold Spray on the inner surface of the corroded parts of the pipeline of the secondary circuit of the nuclear power plants (NPP) is to create a surface with high corrosion resistance, to extend the service li...

The flange joints of the emergency control cassette (HRK) nozzles are a possible source of leakage in a nuclear reactor. Threaded sockets and flange bolts may show mechanical and corrosion damage during operation, which must be monitored and evaluated in detail. CVŘ employees ...

Welded joints of three austenitic superheater steels (SUPER 304H, HR3C and TP347H FG) were subjected to six years of exposure in a real coal boiler superheater, while the temperature of joints was continuously recording. After removal from the superheater, the welded joints ...

The dependence of time to fracture on temperature was verified on high temperature 9-12 %Cr steels, while the stress was the same in all tests. These steels are currently used in the energy industry, where their good mechanical properties at high temperatures are utiliz...

The energy demand is constantly growing. Therefore, resources are being sought that would cover it, even taking into account the minimal footprint for the environment. One option is small modular reactors with a maximum output of up to 300 MWe. Setting the requirements ...

Nowadays, there are increasing demands for non-standard ways of measuring very delicate components, coatings, and joints, monitoring the structures of different materials, and checking the texture or surface roughness with high measurement accuracy. For these purposes, optical devices are...

The paper reports on the development of technology for evaluating the material properties of metallic structural materials used at NPPs using the results of small punch SPT tests and prediction using neural networks for cases where evaluation by standard or miniaturized testing&#...

During operation, due to the long-term effect of operating conditions (stress, temperature, pressure, environment), the properties of the materials of the core components of energy equipment degrade, which can lead to a reduction or loss of reliability and safety during their continued...

Laboratory ultrasonic testing of the welded joint was performed on tubular bodies measuring 89 x 6 mm. The testing was performed to verify the test system in terms of detecting the selected type of defects at the selected temperature. The test system includes ultrasonic...

There is a certain amount of weld joints with incomplete penetration on technical equipment. The weld's root is a significant stress concentrator, which is strongly unsatisfactory in fatigue evaluation based on linear elastic analysis. This is a singular place. One of the...

The project addresses the replacement of a heterogeneous welded joint on the feed water pipeline inside the steam generator at NPP V2 Jaslovské Bohunice unit 3, 4. The heterogeneous welded joint is located on the secondary circuit of the steam generator and is a pi...

The paper summarizes the results of material tests necessary for defining the initiation conditions and the rate of propagation of corrosion-fatigue cracks in repair welds of cast steel COR 13/4. Welds made with the additive material Avesta 248 SV, and duplex alloy ER 22...