Applicability of iron phosphate glass medium for loading NaCl originated from seawater used for cooling the stricken power reactors

Conference · Mon Jul 01 00:00:00 EDT 2013

DOI:https://doi.org/10.1115/ICEM2013-96108· OSTI ID:22535208

Amamoto, Ippei; Kobayashi, Hidekazu; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki ^[1]; Kitamura, Naoto; Takebe, Hiromichi ^[2]; Mitamura, Naoki; Tsuzuki, Tatsuya ^[3]

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1. Japan Atomic Energy Agency, Tokai-mura, Ibaraki Pref. (Japan)
2. Ehime University, Matsuyama, Ehime Pref. (Japan)
3. Central Glass Co.,Ltd., Matsusaka, Mie Pref. (Japan)

As the part of investigation for immobilization of the sludge as one of the radioactive wastes arising from the treatment of contaminated water at Fukushima Dai-ichi nuclear power plant, applicability of vitrification method has been evaluated as a candidate technique. The aim of this study is to evaluate the influence of NaCl as one of the main constituents of sludge, on glass formation and glass properties. Two kinds of iron phosphate glass (IPG) media in the xFe{sub 2}O{sub 3}-(100-x)P{sub 2}O{sub 5}, with x=30 and 35 (mol%) were chosen and the glass formation, structure and properties including density, coefficient of thermal expansion, glass transition temperature, onset crystallization temperature and chemical durability of NaCl-loaded IPG were studied. The results are summarized as follows. Sodium chloride, NaCl could be loaded into IPG medium as Na{sub 2}O and Cl contents and their loading ratio could be up to 19 and 15 mol%, respectively. Majority of Cl content of raw material NaCl was thought to be volatilized during glass melting. Loading NaCl into IPG induces to de-polymerize glass network of phosphate chains, leads to decrease both glass transition and onset crystallization temperatures, and to increase coefficient of thermal expansion. NaCl-loaded IPG indicated good chemical durability in case of using 35Fe{sub 2}O{sub 3}- 65P{sub 2}O{sub 5} medium. (authors)

• Research Organization: American Society of Mechanical Engineers - ASME, Nuclear Engineering Division, Environmental Engineering Division, Two Park Avenue, New York, NY 10016-5990 (United States)
• OSTI ID: 22535208
• Resource Relation: Conference: ICEM2013 - ASME 2013: 15. International Conference on Environmental Remediation and Radioactive Waste Management, Brussels (Belgium), 8-12 Sep 2013; Other Information: Country of input: France; 13 refs
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CRYSTALLIZATION
FUKUSHIMA DAIICHI NUCLEAR POWER STATION
IRON OXIDES
IRON PHOSPHATES
PHOSPHATE GLASS
PHOSPHORUS OXIDES
RADIOACTIVE WASTES
SEAWATER
SODIUM CHLORIDES
SODIUM OXIDES
THERMAL EXPANSION