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Journal of Failure Analysis and Prevention

, Volume 14, Issue 1, pp 113–121 | Cite as

Methods of Preventing the Spread of Zinc Contamination During Vacuum Processing

  • Paul S. Korinko
  • Andrew J. Duncan
  • Kevin J. Stoner
Technical Article---Peer-Reviewed

Abstract

Radioactive zinc, 65Zn, was detected after a thermal vacuum process that extracted a desired product from articles out of a commercial light water reactor. While the facility is designed to handle radioactive materials, the location of the 65Zn was in an area that is not designed for gamma-emitting contaminants. A series of experiments were conducted to entrain the contaminant in an easily replaceable trap within the process piping. The experiments were conducted with increasing levels of complexity. Initially, a simple apparatus was developed to determine the effect of substrate temperature on the vapor capture, which was followed by experiments to determine the effect of filter pore size on pumping and trapping, and finally the interactive effects of both pore size and temperature were evaluated. The testing was conducted on a system that used a roughing vacuum pump using model and prototypic materials. It was determined that heating the substrate to nominally 200 °C resulted in effective trapping on the model as well as prototypic material.

Keywords

Containment Vacuum effects Metallurgical investigation 

References

  1. 1.
    P.S. Korinko, M.H. Tosten, Analysis of zinc 65 contamination after vacuum thermal process. J. Pract. Fail. Anal. 13(4), 389–395 (2013)CrossRefGoogle Scholar
  2. 2.
    G.W. Sears, J.W. Cahn, Interaction of condensable gases with cold surfaces. J. Chem. Phys. 33(2), 494–499 (1960)CrossRefGoogle Scholar
  3. 3.
    T. Parker (ed.), Physical Vapor Deposition (Airco Temescal, 1976)Google Scholar
  4. 4.
    P.B. Barna, History of Thin Films Growth, Techniques, Characterization, Research Institute for Technical Physics and Materials Science of HAS, Budapest, Hungary, Autumn School 2005 on Advanced Materials Science and Electron Microscopy, Humbold University of Berlin, 4–7 Oct 2005Google Scholar
  5. 5.
    B.A. Movchan, A.V. Demshishin, Study of the structure and properties of thick vacuum condensates of nickel, titanium, tungsten, aluminum oxide and zirconium dioxide. Fiz. Metal. Metaloved. 28(4), 653–660 (1969)Google Scholar
  6. 6.
    G.W. Sears, Mechanism of whisker growth. Acta Metall. 3, 367–369 (1955)CrossRefGoogle Scholar
  7. 7.
    R.V. Coleman, G.W. Sears, Growth of zinc whiskers. Acta Metall. 5, 131–136 (1957)CrossRefGoogle Scholar
  8. 8.
    J.B. Hudson, Nucleation of zinc on glass. J. Chem. Phys. 36(4), 887–889 (1962)CrossRefGoogle Scholar
  9. 9.
    M. Kast, P. Schroeder, Y.J. Hyun, P. Pongratz, H. Bruuckl, Synthesis of single crystal Zn Metal nanowires using cold wall physical vapor deposition. NanoLetters 7(8), 2540–2544 (2007)CrossRefGoogle Scholar

Copyright information

© ASM International 2013

Authors and Affiliations

  • Paul S. Korinko
    • 1
  • Andrew J. Duncan
    • 1
  • Kevin J. Stoner
    • 2
  1. 1.Savannah River National LaboratoryMaterials Science and TechnologyAikenUSA
  2. 2.Savannah River Nuclear SolutionsSavannah River Tritium EnterpriseAikenUSA

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