FURTHER DEVELOPMENT OF GAS-PRESSURE BONDING OF ZIRCALOY-CLAD FLAT-PLATE URANIUM DIOXIDE FUEL ELEMENTS

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The effects of core barrier coatings, void spaces, and surface-cleaning techniques on the quality of Zircaloyclad flat-plate UO/sub 2/ fuel elements prepared by gas-pressure bonding were investigated. Techniques were developed for the application of barrier layers of chromium by a vapordeposition process and of crystalline carbon by a pyrolytic process. These coatings, together with a graphite coating previously developed, were evaluated in pressure-bonded fuel elements for their effectiveness in preventing coreto-cladding reaction and for their general production feasibility. Crystalline carbon coatings 15 to 40 mu in. thick and chromium coatings 25 to 40 mu in. thick were determined to be ... continued below

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Pages: 59

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Paprocki, S.J.; Hodge, E.S.; Layer, E.H.; Wintucky, E.G.; Gripshover, P.J. & Carmichael, D.C. May 11, 1960.

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Description

The effects of core barrier coatings, void spaces, and surface-cleaning techniques on the quality of Zircaloyclad flat-plate UO/sub 2/ fuel elements prepared by gas-pressure bonding were investigated. Techniques were developed for the application of barrier layers of chromium by a vapordeposition process and of crystalline carbon by a pyrolytic process. These coatings, together with a graphite coating previously developed, were evaluated in pressure-bonded fuel elements for their effectiveness in preventing coreto-cladding reaction and for their general production feasibility. Crystalline carbon coatings 15 to 40 mu in. thick and chromium coatings 25 to 40 mu in. thick were determined to be satisfactory. In the stady of the flow of cladding-plate material into void spaces in the picture-frame assembly, it was established that excessive flow, and consequent thinning of the cladding, can be minimized by individually compartmentalizing the cores with Zircaloy ribs. This design resulted in maximum restriction of the effects of a cladding failure in service. Quantitative data on the maximum amount of void space resulting from manufucturing tolerances or from chipped fuel cores that is tolerable in cladding failure in service. Quantitative data on the maximum amount of void space resulting from manufucturing tolerances or from chipped fuel cores that is tolerable in elements of this design were obtained. In stadies of surface-cleaning technlques, it was found that a final multistep rinsing cycle resulted in bonds consistently free of evidence of contamination. (See also BMI-1374.) (auth)

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Pages: 59

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  • Other Information: Orig. Receipt Date: 31-DEC-60

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  • Report No.: BMI-1436
  • Grant Number: W-7405-ENG-92
  • DOI: 10.2172/4138392 | External Link
  • Office of Scientific & Technical Information Report Number: 4138392
  • Archival Resource Key: ark:/67531/metadc865932

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  • May 11, 1960

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Nov. 18, 2016, 7:20 p.m.

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Paprocki, S.J.; Hodge, E.S.; Layer, E.H.; Wintucky, E.G.; Gripshover, P.J. & Carmichael, D.C. FURTHER DEVELOPMENT OF GAS-PRESSURE BONDING OF ZIRCALOY-CLAD FLAT-PLATE URANIUM DIOXIDE FUEL ELEMENTS, report, May 11, 1960; Columbus, Ohio. (digital.library.unt.edu/ark:/67531/metadc865932/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.