STP1270: The Modelling of Irradiation-Enhanced Phosphorus Segregation in Neutron Irradiated Reactor Pressure Vessel Submerged-Arc Welds

    Druce, SG
    IAEA Technology, Harwell Laboratory,

    English, CA
    IAEA Technology, Harwell Laboratory,

    Foreman, AJE
    IAEA Technology, Harwell Laboratory,

    McElroy, RJ
    IAEA Technology, Harwell Laboratory,

    Vatter, IA
    IAEA Technology, Harwell Laboratory,

    Bolton, CJ
    Nuclear Electric, Berkeley Technology Centre,

    Buswell, JT
    Nuclear Electric, Berkeley Technology Centre,

    Jones, RB
    Nuclear Electric, Berkeley Technology Centre,

    Pages: 19    Published: Jan 1996


    Abstract

    Recent results on neutron-irradiated RPV submerged-arc welds have revealed grain boundary segregation of phosphorus during irradiation, which may lead to intergranular fracture. However, the experimental database is insufficient to define the dependence of the process on variables such as dose, dose-rate and temperature. This paper describes work in which two existing models of phosphorus segregation, under thermal or irradiation conditions, have been developed to obtain predictions of these dependencies.

    The critical parameters in the models have been adjusted to give consistency with the available reference data, and predictions have been made of the dependence of segregation on a number of variables.

    Keywords:

    Irradiation damage, welds, segregation, phosphorus, inter-granular failure


    Paper ID: STP16471S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP16471S


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