STP1170

    Radiation Stability of WWER-440 Vessel Materials

    Published: Jan 1993


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    Abstract

    The main results of a complex investigation of radiation embrittlement of WWER-440 reactor vessel (RV) materials, carried out in the former USSR are presented. The object of the investigation was surveillance specimen (SS) evaluations of RV materials. It has been found that at an irradiation temperature of 270°C neither the base metal (steel 15 Kh2MFA) nor weld metal exhibits saturation of radiation embrittlement in irradiation of specimens up to neutron fluences of 7 × 1020 n/cm2 (E > 0.5 MeV). Regularities in the influence of impurity elements (copper and phosphorus) on radiation embrittlement of RV materials have been investigated. It is shown that radiation embrittlement of the weld metal is determined by at least four processes associated with the individual effects of copper and phosphorus, their joint effect, and the mechanism of direct buildup of radiation defects in the metal. The effect of dependence of the radiation embrittlement characteristics of the WWER-440 RV materials on the neutron flux has been found. It is shown that within the range of fluences from 1 to 5 × 1018 n/cm2 at a neutron flux of 4 × 1011 n/cm2˙s, radiation embrittlement is stronger than in irradiation at a neutron flux of 3 to 4 × 1012 n/cm2˙s. A tendency has been observed for the values of the radiation embrittlement coefficients AF, characterizing sensitivity of the steel to radiation embrittlement, to reduce with an increase of neutron fluence in irradiation of specimens with a neutron flux of 4 × 1011 n/cm2˙s.

    Keywords:

    pressure vessel steels, radiation embrittlement, surveillance program, radiation effects, neutron fluence, copper, phosphorus, mechanisms


    Author Information:

    Amayev, AD
    Head of laboratory, deputy head of laboratory, senior researcher, and senior researcher, Kurchatov Institute of Atomic Energy, Moscow,

    Kryukov, AM
    Head of laboratory, deputy head of laboratory, senior researcher, and senior researcher, Kurchatov Institute of Atomic Energy, Moscow,

    Levit, VI
    Head of laboratory, deputy head of laboratory, senior researcher, and senior researcher, Kurchatov Institute of Atomic Energy, Moscow,

    Sokolov, MA
    Head of laboratory, deputy head of laboratory, senior researcher, and senior researcher, Kurchatov Institute of Atomic Energy, Moscow,


    Paper ID: STP24759S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP24759S


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