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Simulation of Neptunium Extraction in an Advanced PUREX Process — Model Improvement

Research output: Contribution to journalJournal article

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  • Hongyan Chen
  • Robin J. Taylor
  • Megan Jobson
  • David Woodhead
  • Colin Boxall
  • Andrew Masters
  • Scott Edwards
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<mark>Journal publication date</mark>2017
<mark>Journal</mark>Solvent Extraction and Ion Exchange
Issue number1
Volume35
Number of pages18
Pages (from-to)1-18
<mark>State</mark>Published
Early online date20/01/17
<mark>Original language</mark>English

Abstract

Routing neptunium to a single product in spent nuclear fuel reprocessing is a significant challenge. In this work, we have further improved the simulation of neptunium extraction in an advanced PUREX flowsheet by applying a revised model of the Np(V)-Np(VI) redox reaction kinetics, a new nitric acid radiolysis model and by evaluating various models for the nitrous acid distribution coefficient. The Np disproportionation reaction is shown to have a negligible effect. The models are validated against published ‘cold test’ experimental results; the ‘hot test’ simulation suggests high neptunium radiolysis could help to achieve high recoveries using this flowsheet.