History of Science and Engineering Annotation << Back Ground of Phosphorus Content for Core Weld Radiation Embrittlement Assessment of Rovno-1 NPP RPV Shtrombakh Ya.I. Chernobaeva А.А. Nikolaev Yu.А. Krasikov Е.А. The chemical composition of Rovno-1 NPP weld metal surveillance specimens have been studied and generalized in Institute or Reactor Materials and Technologies NRC «Kurchatov Institute». The analysis of phosphorus distribution in the weld metal has been done after study of chemical composition in irradiated Rovno-1 NPP surveillance specimens. The assessment of upper boundary of phosphorus content in weld metal has been performed at the 5 % significance level. The radiation embrittlement dependence for the weld 4 of Rovno-1 NPP has been define more precisely. Keywords: surveillance specimens; reactor pressure vessel (RPV); weld; phosphorus content. Contacts: E-mail: anna.chernobaeva@gmail.com Pp. 119-130.