Physico-Chemical Studies of Clad UO$Sub 2$ in Potential Meltdown Environments.

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Behavior of zirconium alloy clad UO{sub 2} fuel elements in steam and air at 100 deg C to the melting point of UO{sub 2} was studied. Heating tests of Zircaloy-4 tubes with internal pressure show that steam oxidation of the metal results in lower deformation rates, less deformation, and higher failure temperature. Air oxidation of Zircaloy-4 is erratic and occurs at a greater rate than in steam due to the reaction with N in the air. Rate-controlling mechanism for UO{sub 2} oxidation by steam is the diffusion of O through UO{sub 2+x} lattice. The air oxidation rate of 304 stainless … continued below

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p. 316-360

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White, J. F. October 31, 1969.

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Description

Behavior of zirconium alloy clad UO{sub 2} fuel elements in steam and air at 100 deg C to the melting point of UO{sub 2} was studied. Heating tests of Zircaloy-4 tubes with internal pressure show that steam oxidation of the metal results in lower deformation rates, less deformation, and higher failure temperature. Air oxidation of Zircaloy-4 is erratic and occurs at a greater rate than in steam due to the reaction with N in the air. Rate-controlling mechanism for UO{sub 2} oxidation by steam is the diffusion of O through UO{sub 2+x} lattice. The air oxidation rate of 304 stainless steel is about 10{sup 3} times less than the rate in steam up to 1370 deg C due to excess CR{sub 2}O{sub 3} film formation. During steam oxidation, the film provides less protection because of its spinel structure. Tensile strength of annealed 304 L decreased from 0.66 kg/mm{sup 2} at room temperature to 0.86 kg/mm{sup 2} at 1375 deg C. Thermal conductivity increased with temperature. The spectral emittance of Zircaloy-4 varied. Solution of O in the metal during prolonged heating caused spectral and total emittance to approach the values of the unoxidized metal. (F.S.)

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p. 316-360

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  • Other Information: UNCL. Orig. Receipt Date: 31-DEC-69

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  • October 31, 1969

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  • Jan. 22, 2018, 7:23 a.m.

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  • June 20, 2024, 12:29 p.m.

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White, J. F. Physico-Chemical Studies of Clad UO$Sub 2$ in Potential Meltdown Environments., report, October 31, 1969; [Cincinnati, Ohio]. (https://digital.library.unt.edu/ark:/67531/metadc1057107/: accessed June 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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