Burn up extension in a PBMR-400 full core using weapon grade plutonium fuel mixed with thorium


Acir A., Coskun H.

KERNTECHNIK, vol.76, no.5, pp.337-340, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 76 Issue: 5
  • Publication Date: 2011
  • Doi Number: 10.3139/124.110170
  • Title of Journal : KERNTECHNIK
  • Page Numbers: pp.337-340

Abstract

In this study, the time dependent criticality and burn up analyses for a full core model of Pebble Bed Modular Reactors, such as PBMR-400, are performed using weapon grade plutonium mixed with thorium as an alternative to enriched UO(2) fuel. Neutronic calculations are performed with the MCNP and MONTEBURNS 2.0 using ENDF/B-V nuclear data library 9.6% enriched UO(2) gives an effective multiplication factor of k(eff) approximate to 1.2395, which can be achieved by 18% weapon grade plutonium +82% ThO(2) fuel mixture. Thorium mixed fuel with 18% weapon grade plutonium fuel would allow reactor operation periods 7 years without fuel change with burn up levels of 205 000 MW.D/t, for end of life k(eff) set equal to 1.02.