THERMAL ANALYSIS OF WASTE GLASS MELTER FEEDS

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Melter feeds for high-level nuclear waste (HLW) typically contain a large number of constituents that evolve gas on heating, Multiple gas-evolving reactions are both successive and simultaneous, and include the release of chemically bonded water, reactions of nitrates with organics, and reactions of molten salts with solid silica. Consequently, when a sample of a HLW feed is subjected to thermogravimetric analysis (TGA), the rate of change of the sample mass reveals multiple overlapping peaks. In this study, a melter feed, formulated for a simulated high-alumina HLW to be vitrified in the Waste Treatment and Immobilization Plant, currently under construction at ... continued below

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AA, KRUGER; PR, HRMA; R, POKORNY & DA, PIERCE October 21, 2011.

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  • Hanford Site (Wash.)
    Publisher Info: Hanford Site (HNF), Richland, WA (United States))
    Place of Publication: Richland, Washington

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Melter feeds for high-level nuclear waste (HLW) typically contain a large number of constituents that evolve gas on heating, Multiple gas-evolving reactions are both successive and simultaneous, and include the release of chemically bonded water, reactions of nitrates with organics, and reactions of molten salts with solid silica. Consequently, when a sample of a HLW feed is subjected to thermogravimetric analysis (TGA), the rate of change of the sample mass reveals multiple overlapping peaks. In this study, a melter feed, formulated for a simulated high-alumina HLW to be vitrified in the Waste Treatment and Immobilization Plant, currently under construction at the Hanford Site in Washington State, USA, was subjected to TGA. In addition, a modified melter feed was prepared as an all-nitrate version of the baseline feed to test the effect of sucrose addition on the gas-evolving reactions. Activation energies for major reactions were determined using the Kissinger method. The ultimate aim of TGA studies is to obtain a kinetic model of the gas-evolving reactions for use in mathematical modeling of the cold cap as an element of the overall model of the waste-glass melter. In this study, we focused on computing the kinetic parameters of individual reactions without identifying their actual chemistry, The rough provisional model presented is based on the first-order kinetics.

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  • THE 8TH INTERNATIONAL SYMPOSIUM ON RADIATION SAFETY MANAGEMENT (ISRSM) NUCLEAR ENGINEERING & TECHNICAL INSTITUTE (NETEC) KHMP & KOREAN RADIOACTIVE WASTE SOCIETY 11/02/2011 THRU 11/04/2011 GYEONGJU, REPUBLIC OF KOREA

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  • Report No.: ORP-50828 Rev 1
  • Grant Number: DE-AC27-08RV14800
  • Office of Scientific & Technical Information Report Number: 1029196
  • Archival Resource Key: ark:/67531/metadc843247

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  • October 21, 2011

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • July 25, 2016, 6:18 p.m.

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AA, KRUGER; PR, HRMA; R, POKORNY & DA, PIERCE. THERMAL ANALYSIS OF WASTE GLASS MELTER FEEDS, article, October 21, 2011; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc843247/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.