The effects of vent-notch area on bulging and thinning during the clad vent test closure-weld operation

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The internal gas pressure during clad vent set (CVS) welding is vented through aligned vent notches in each cup. For Galileo, Ulysses, and most of Cassini CVS production, the vent-notch dimensional requirements for both cups were as follows: (1) vent-notch depth, 0.15/0.20 mm; (2) vent-notch width, 0.25/0.35 nun; (3) bottom of vent-notch comers, sharp to full radius; (4) top of vent-notch edge, 0.05 mm maximum break; and (5) maximum variation between vent notch and grit-blasted triangle centerlines, 3{degrees}. During the fuel encapsulation operation (with {sup 238}PuO{sub 2} fuel pellets) at Los Alamos National Laboratory (LANL), excessive bulges or blowouts at … continued below

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18 p.

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Ulrich, G. B. September 1, 1996.

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  • Oak Ridge Y-12 Plant
    Publisher Info: Oak Ridge Y-12 Plant, TN (United States)
    Place of Publication: Tennessee

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The internal gas pressure during clad vent set (CVS) welding is vented through aligned vent notches in each cup. For Galileo, Ulysses, and most of Cassini CVS production, the vent-notch dimensional requirements for both cups were as follows: (1) vent-notch depth, 0.15/0.20 mm; (2) vent-notch width, 0.25/0.35 nun; (3) bottom of vent-notch comers, sharp to full radius; (4) top of vent-notch edge, 0.05 mm maximum break; and (5) maximum variation between vent notch and grit-blasted triangle centerlines, 3{degrees}. During the fuel encapsulation operation (with {sup 238}PuO{sub 2} fuel pellets) at Los Alamos National Laboratory (LANL), excessive bulges or blowouts at the CVS closure-weld tie-in location occurred with 11.8% (27 out of 229) of the flight-quality welds made with the aforementioned standard vent-notch dimensions. These bulges and blowouts are primarily the result of inadequate venting of the increased gas pressure during the thermal cycle of the closure-weld operation. Proper venting is dependent mostly upon the weld parameters and the total vent-notch area. Because of the increased incidence of bulges/blowouts in the {sup 238}PuO{sub 2}-fueled CVS units, LANL personnel requested that consideration be given to increasing the vent-notch size to minimize further the loss of CVS hardware and the potential loss of {sup 238}PuO{sub 2} pellets. Thus, increasing further the production yield of the closure-weld operation would avoid potentially severe schedule delays.

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18 p.

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OSTI as DE97002831

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  • Other Information: PBD: Sep 1996

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  • September 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • April 8, 2016, 5:08 p.m.

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Ulrich, G. B. The effects of vent-notch area on bulging and thinning during the clad vent test closure-weld operation, report, September 1, 1996; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc674283/: accessed June 6, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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