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      https://www.ias.ac.in/article/fulltext/pram/090/04/0046

    • Keywords

       

      Primary-knock-on atom spectra; displacement per atom; displacement per atom cross-section; computation of radiation damage; molecular dynamics simulation; renormalisation

    • Abstract

       

      The radiation damage in the structural materials of a 500 MWe Indian prototype fast breeder reactor (PFBR) is re-assessed by computing the neutron displacement per atom (dpa) cross-sections from the recent nuclear data library evaluated by the USA,ENDF/B-VII.1, wherein revisions were taken place in the new evaluations of basicnuclear data because of using the state-of-the-art neutron cross-section experiments, nuclear model-based predictions and modern data evaluation techniques. An indigenous computer code, computation of radiation damage (CRaD), is developed at our centre to compute primary-knock-on atom (PKA) spectra and displacement cross-sections of materials both in point-wise and any chosen group structure from the evaluated nuclear data libraries. The newradiation damage model, athermal recombination-corrected displacement per atom (arc-dpa), developed based on molecular dynamics simulations is also incorporated in our study. This work is the result of our earlier initiatives to overcome some of the limitations experienced while using codes like RECOIL, SPECTER and NJOY 2016, to estimate radiation damage. Agreement of CRaD results with other codes and ASTM standard for Fe dpa cross-section is found good. The present estimate of total dpa in D-9 steel of PFBR necessitates renormalisation of experimental correlations of dpa and radiation damage to ensure consistency of damage prediction with ENDF/B-VII.1 library.

    • Author Affiliations

       

      UTTIYOARNAB SAHA1 K DEVAN1 ABHITAB BACHCHAN1 G PANDIKUMAR1 S GANESAN2

      1. Reactor Neutronics Division, Reactor Design Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institue, Kalpakkam 603 102, India
      2. Bhabha Atomic Research Centre, Mumbai 400 085, India
    • Dates

       
  • Pramana – Journal of Physics | News

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