The paper is a practical example of the use of detailed laboratory results of material tests (such as mechanical, creep, microstructural, and chemical tests) for subsequent in-situ inspection of VT steam pipeline, which was suspected that parts of the pipeline may be brittle. ...

Uneven temperatures in the circumferential direction can occur in the combustion chamber. The combustion chamber of the GT750-6 gas turbine with a microdiffusion circular burner is analyzed. The results of the calculation of thermal stresses in the flame and in the circular ...

Steam pipelines and especially their welds are exposed to steam pressure and high temperatures in the range of 500 to 600 °C during operation. The applied stress and temperature, together with the chemical composition and microstructure of the material, have a fundamental influenc...

The materials of reactor pressure vessel internals are exposed to a significantly more intense neutron flux than reactor pressure vessel during their operation. The technology of thermal annealing can be one of the possible solutions to ensure long term service life of react...

The paper presents material tests for determining the conditions of corrosion-fatigue crack initiation in COR 13/4 steel. The paper summarizes the results of high-cyclic fatigue tests of COR 13/4 steel – determination of S-N curves on smooth and notched cylindrical rods ...

Application of dispersants in secondary circuit, specifically polyacrylic acid (PAA), was in the USA investigated since year 2000. The use of dispersants is based on their interaction with corrosion products, which slows down the deposition of corrosion products and, in some case...

The paper deals with the comparison of the results of corrosion tests of superheated austenitic Sanicro 25 steel in the form of a straight pipe, similar weld and 90° bending. Gravimetric corrosion tests were performed in air at temperatures of 600, 650, 700 and 750 ...

This paper deals with the evaluation of precipitation and coarsening process of the Laves phase in the individual zones of the heat affected zone of heterogenous weld of 9% Cr steels P91 and P92. Precipitation of Laves phase was evaluated after long-term laboratory agin...

Due to the precipitation of the brittle sigma phase in austenitic creep-resistant steel HR3C occurs to significant embrittlement of steel. This steel is used for application of superheaters of supercritical coal-fired power plant blocks. This paper deals with the microstructure change...

The paper deals with the problem of determining the delta ferrite content in austenitic stainless steels. Delta ferrite in these steels, together with other factors, affects the degree of the susceptibility to hot cracking during welding. Particularly is evaluated the influence and...

The article summarizes the main achievements of terminated projects focused on the development of the Supercritical Water Cooled Reactor (SCWR), financially supported by the European Commission in Horizon 2020, fifth, sixth and seventh framework programmes, as well as in the ongoing pr...

The paper presents list of the most significant results of the solution of the Competence Centre Project of the Technology Agency of the Czech Republic “Centre of research and experimental development of reliable energy production” (CESEN acronym). Two selected results, achieved in...

The article presents information on R&D projects of the Research Centre Rez developed within the project of National Centre for Energy, sub-project DP6 “Development of diagnostic methods for characterization of own energy components”, working package PB1.14 “Perspec- tive diagnostic methods”, ...

This article deals with a summary of the results of the project of the National Center for Energy, sub-project DP6 “Development of diagnostic methods for characterization of key components of energy units”, work package PB1.13 “Turbine blades – causes and prevention of failu...

The paper evaluates the fatigue strength of the martensitic steel Böhler T552 used for the production of moving L-1 blades of low-pressure steam turbine stages. High cycle fatigue tests were performed on test specimens without defects with a polished surface and samples with...

The main objective of the project is successful copy surfacing cobalt alloy on the leading edge of rotor blades. This protective layer has excellent effectiveness against the action of water droplets and their degradation mechanism, erosion by water droplets. The article shows&#x...

Steam turbines production has gone through large change in the last decade. Main production was aimed specially at the units of large power output in range 200 – 1200 MW usually fossil or nuclear power plants. Currently main production is aimed at small power outpu...

This paper summarizes the applied numerical-analytical approach for predicting the fatigue crack growth rate and direction of propagation in potentially critical localities of the shaft of the low-pressure part of the steam turbine. The primary objective was to develop a means of...

During the revision of the pump SULZER 200-450 of the impeller 2TQ32D01, a crack was detected on one of the five blades based on visual and capillary inspection. In order to determine the causes of damage, the impeller was transferred to ÚJV Řež. Destructive evalua...

Increased attention was given to the development of thermal cycles with supercritical carbon dioxide (sCO2 cycles) as a working medium already in the 1970s. Mainly due to the insufficient level of available materials and technologies, further development was abandoned for several ...