STP725: An Internally Consistent Model for Radiation-Induced Void Swelling

    Nichols, FA
    Senior technical advisor and assistant nuclear engineer, Argonne National Laboratory, Argonne, Ill.

    Liu, YY
    Senior technical advisor and assistant nuclear engineer, Argonne National Laboratory, Argonne, Ill.

    Pages: 21    Published: Jan 1981


    Abstract

    Most previous analytical models for radiation-induced void swelling employed reaction rate theory in which all concentrations were “averaged out.” The loss terms for use in such models were then usually obtained by separate, single-cell diffusion analyses which introduced various inconsistencies and uncertainties. We present here a unified, internally consistent analytical approach which incorporates, for the first time, the presence of dislocations, voids, and grain boundaries each with their own spatially varying diffusional fields. The results show large variations in sink strength Z-factors, usually treated as constants, significant variations in the void swelling bias factor, and quantitative levels of bias about an order of magnitude larger than most previous estimates. Good qualitative agreement is shown with available data, consistent with current concepts of close-pair annihilation in high-energy damage cascades.

    Keywords:

    radiation, irradiation, displacement, radiation damage, stainless steels, metals, swelling, vacancy, interstitial, voids, fast neutrons, radiation effects


    Paper ID: STP28211S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP28211S


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