THERMAL ANALYSIS OF WASTE GLASS MELTER FEEDS

Conference · Fri Oct 21 00:00:00 EDT 2011

OSTI ID:1029196

AA, KRUGER; PR, HRMA; R, POKORNY; DA, PIERCE

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.

• Research Organization: Hanford Site (HNF), Richland, WA (United States)
• Sponsoring Organization: USDOE Office of Environmental Management (EM)
• DOE Contract Number: DE-AC27-08RV14800
• OSTI ID: 1029196
• Report Number(s): ORP-50828 Rev 1; TRN: US1105664
• Resource Relation: Conference: 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
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CERAMIC MELTERS
CHEMISTRY
CONSTRUCTION
HEATING
KINETICS
MANAGEMENT
MOLTEN SALTS
NITRATES
NUCLEAR ENGINEERING
RADIATION PROTECTION
RADIOACTIVE WASTES
SACCHAROSE
SILICA
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
WASTE PROCESSING