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Development of a Mass Verification Method For UREX+3a NPEX product Using an Active Well Coincidence Counter

The ability of inspection agencies and facility operators to measure mixed oxide actinide powders is becoming increasingly necessary as reprocessing spent nuclear fuel becomes more attractive.

The objective of this project is to develop a technique for verifying the bulk oxide masses from the reprocessing method Uranium Extraction (UREX+3a), in particular the product material from the Neptunium Plutonium Extraction (NPEX) separations stream which contains U, Np, and Pu.  In additions to measuring UREX+3a products, a methodology to verify other bulk oxide materials containing up to four different actinides will be developed.

Technical Approach:

  • Measure actinide powders using a combination of passive, active (AmLi), and active (AmBe) techniques
  • Analyze detector singles using modified multiplicity list mode software.
  • Determine masses of different actinide isotopes based off  their nuclear properties and known isotopic ratios
  • Verify method using MCNPX models
  • Verify MCNPX models using measured oxide actinide data from Active Well Coincidence Counter detectors

Publications:

  1. Braden Goddard, William S. Charlton, Angela L. Lousteau, "Mass Verification Method for Actinide Mixtures Using a Multi Energy Spectrum Active Well Coincidence Counter," Proceedings of the 51st Annual Meeting of the Institute of Nuclear Materials and Management, Baltimore, MD, USA, July 11-15, 2010. See Document
  2. B. Goddard, W.S. Charlton, and S.M McDeavitt, "Real-Time Detection of UREX+3a Extraction Streams for Materials Accountancy," Proceedings of the 2009 Annual Meeting of the Institute of Nuclear Materials Management, Tucson, AZ, July 12-15, 2009. See Document

 

AWCC detector at ORNL
AWCC detector at ORNL

Theses/Dissertations Produced:

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