Simulation of the Zirflex Process With an Analog Computer

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The Zirflex process was studied extensively at Hanford in the development of technology for the interim reprocessing of power reactor fuels. The process involves the dissolution of Zircaloy in aqueous ammonium fluoride - ammonium nitrate solution. It is of particular interest at Hanford because of the impending fuel recovery from Zircaloy-clad PRTR and NPR elements. The chemical kinetics of the Zirflex reaction were not fuily defined at the end of the original studies. However, a pseudo first order reaction with free'' fluoride (fluoride not complexed with Zr) was deemed to describe the kinetics adequately for engineering calculations. The refined kinetic ... continued below

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Pages: 40

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Smith, P. W. October 25, 1961.

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  • Hanford Atomic Products Operation
    Publisher Info: General Electric Co. Hanford Atomic Products Operation, Richland, Wash.
    Place of Publication: Richland, Washington

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Description

The Zirflex process was studied extensively at Hanford in the development of technology for the interim reprocessing of power reactor fuels. The process involves the dissolution of Zircaloy in aqueous ammonium fluoride - ammonium nitrate solution. It is of particular interest at Hanford because of the impending fuel recovery from Zircaloy-clad PRTR and NPR elements. The chemical kinetics of the Zirflex reaction were not fuily defined at the end of the original studies. However, a pseudo first order reaction with free'' fluoride (fluoride not complexed with Zr) was deemed to describe the kinetics adequately for engineering calculations. The refined kinetic equation and the analog computer solution on model of the system are discussed. The results of thirty computer simulated dis solutions are also presented, and the data are used to illustrate the effects of the process variables on the Zirflex dissolution time cycle. The data from a selected few of the runs are directly applicable to the reprocessing of PRTR fuel elements in Redox. It was found that the Zirflex reaction kinetics are dependent on free'' fluoride ion to the 2.0l7 power and on H ion to the 0.457 power according to laboratory data secured after completion of the original research and development studies. The direct integration of the kinetic equation was prevented by the complex interdependence of the chemical variables. However, an analog computer circuit was evolved which was used to solve the defining equations simultaneously. The circuitry is discussed in the report because of its applicability to future studies and its novel aspects. The data from the computer runs verified the results of the earlier laboratory and pilot plant work. However, a much clearer view of the process is presented with the continuous graphs of the variables prepared from the computer data. In addition, data not available from the pilot plant studies but applicable to Redox reprocessing of PRTR fuels are presented. (auth)

Physical Description

Pages: 40

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  • Other Information: Orig. Receipt Date: 31-DEC-62

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  • Report No.: HW-71054
  • Grant Number: AT(45-1)-1350
  • DOI: 10.2172/4762661 | External Link
  • Office of Scientific & Technical Information Report Number: 4762661
  • Archival Resource Key: ark:/67531/metadc1029155

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Creation Date

  • October 25, 1961

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Dec. 20, 2017, 3:04 p.m.

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Smith, P. W. Simulation of the Zirflex Process With an Analog Computer, report, October 25, 1961; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1029155/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.