To ensure the long-term safe use of creep-resistant steels at elevated operating temperatures, basic creep strength studies and degradation assessments are essential. Although there is still a lack of systematically obtained reliable data on the creep behaviour of these steels in ...

Research Center Řež s.r.o. has been investigating in the field of nuclear reactors of the 4th generation for a long time. One of the promising concepts of advanced reactors is SCWR (super-critical water-cooled reactor). The paper presents part of the results from the ex...

It is required to comply with the heat treatment during and post welding, which cannot be performed on site due to many difficulties. It is necessary to perform the method of temper bead welding techniques. This technology is known in the project of VVER, but ...

The paper deals with the preparation of the replacement of the pressure measurement nozzle of the main circulation pipe of the primary circuit at the NPP type VVER-1000/320 with a focus on design-technological and material issues in connection with a specific welding pr...

Nuclear fuel claddings prevent against a release of fission products during nuclear power plant operation and spent fuel storage. Cladding materials must resist to extreme conditions in the reactor core, i.e., mechanical stress at elevated temperatures in the corrosion environment &#x...

In 2014, material cluster assemblies, i.e. MCA, were loaded into a reactor of the first Unit of Temelín NPP in frame of a joint project between ČEZ, ALVEL and TVEL with a goal to obtain information about a dependency of microstructure changes and irradiationnduced ...

Zirconium-based alloys used as nuclear fuel cladding materials represent the second barrier of the defence-in-depth protection against fission products release. From the point of view of nuclear safety, it is crucial to understand and be able to predict the cladding behaviour not...

Necessary requirement for success of the Corium retention strategy inside the RPV during the severe accident is the justification of the RPV integrity. Melted Corium inside the RPV leads to the “ablation” effect, in another words it is initiating significant RPV wall thinnin...

Research of the nuclear fuel reliability and extended life cycle is a long-term goal of the ČEZ Group, achieved namely by the participation in the international programmes. The paper describes main outcomes of the OECD Halden Reactor Project and Studsvik Cladding Integrity p...

Nuclear fuel belongs to components and installations that are inspected during refuelling outages of nuclear power plants. The nuclear fuel stays in a reactor core only few years, but it is still important to monitor its status and behavior, because it influences a safe...

This contribution deals with a new device of ŠKODA JS a.s., which is designed for inspections of irradiated fuel assemblies at nuclear power plants. In the case of the VVER-1000/V-320 project, the fuel assembly inspection stand (hereinafter referred to as SI-PS) is designed&#...

The contribution deals with the development of the newest type of linear step control rod drive mechanism (CRDM) type LKP-M/4. The new CRDM was developed together with its electronics to assure full compatibility with new project of power plants VVER 1200 as well a...

The paper briefly summarizes the possibilities of entering and solving CFD flow simulations in the model of the control body under the selected operating mode. A computational model of the reactor emergency cluster was compiled for the solution of pressure fields during its&...

The paper describes the use of artificial intelligence and machine learning to build and train a neural model of the turbine sets of the Temelín nuclear power plant based on available diagnostic data in order to detect anomalies and differences in the behavior of TG1...

This paper describes an experimental method that can be used to find the location of an impact point in a general three-dimensional structure. Measuring vibrations at several measurement points allows determining when the shock wave arrives from the excitation/impact point to...