... have been reviewed and put into context for continued and long-term safe operation of RPVs. KEYWORDS: reactor pressure vessels, fracture toughness, master curve, radiation embrittlement, Charpy impact, nickel, copper, PWR, WWER Introduction A series of nine coordinated research projects CRPs has been...

... of the first generation of VVER-440 RPV steels. Calculations showed that it is possible to cut out a sample of 7×60×95 mm (with consequent repair) from a RPV core weld. Thus, it is impossible to machine the standard 10×10×55 mm Charpy V-notch specimens to determine RPV steel radiation embrittlement. Therefore...

... for radiation embrittlement monitoring. For VVER-440/213 RPVs, 80 % of the surveillance specimens are irradiated with a lead factor greater than 20. Only four specimens of base metal and four specimen halves of weld seam material are irradiated with a lead factor less than 3. Taking into account that full-size...

... problem of radiation embrittlement assessment for VVER-440/213 RPV materials. Prediction of radiation embrittlement of RPV materials using surveillance specimens is efficient on the basis of accelerated irradiation compared to irradiation of the RPV inner surface. However, the lead factor, which...

...Yu. A. Nikolaev Radiation embrittlement kinetics of Cr–Mo and Cr–Ni–Mo steels, used for manufacturing VVER-440 and VVER-1000 RPV steels, respectively, are under consideration. Radiation embrittlement of VVER-440 and VVER-1000 RPV steels exposed to irradiation for 17–22 years is analyzed. Extremely...

...Ya. I. Shtrombakh; Yu. A. Nikolaev The analysis of the current condition on the prediction of radiation embrittlement for VVER RPV materials of the first and second generation has been carried out. The radiation lifetime of a definite type of pressure vessel is determined by various parameters...

...-enriched precipitates and a lower number density (~1 × 1023 m 3) of P clusters. KEYWORDS: fracture toughness, radiation embrittlement, Charpy, To, atom probe, precipitates, master curve, JIc, reactor pressure vessel Introduction The master curve methodology has become a widely accepted technique...

... of irradiation temperature effects to the development of radiation embrittlement models are then discussed. A new methodology that incorporates the chemical compositions into the Charpy trend curve is also developed. The purpose of this new fitting procedure is to generate a new multi-space topography that can...