| Autor: |
V. S. Granovsky, Sevostian Bechta, V. V. Gusarov, V.I. Almjashev, V.B. Khabensky, Andrei Komlev |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Journal of Nuclear Materials. 467:778-784 |
| ISSN: |
0022-3115 |
| DOI: |
10.1016/j.jnucmat.2015.10.035 |
| Popis: |
A new functional (sacrificial) material has been developed in the Fe 2 O 3 –SrO–Al 2 O 3 –CaO system based on strontium hexaferrite ceramic in concrete matrix. The method of producing SM has been advanced technologically; this technological effectiveness allows the SM to be used in ex-vessel core catchers with corium spreading as well as in crucible-type core catchers. Critical properties regarding the efficiency of SM in ex-vessel core catchers, such as porosity, pycnometric density, apparent density, solidus and liquidus temperatures, and water content have been measured. Suitable fractions of SrFe 12 O 19 and high alumina cement (HAC) were found in the SM based on thermodynamic analysis of the SM/corium interaction. The use of sacrificial steel as an additional heat adsorption component in the core catcher allowed us to increase the mass fraction range of SrFe 12 O 19 in the SM from 0.3−0.5 to 0.3–0.85. The activation temperature of the SM/corium interaction has been shown to correspond to the liquidus temperature of the local composition at the SM/corium interface. The calculated value of this temperature was 1716 °C. Analysis of phase transformations in the SrO–Fe 2 O 3 system revealed advantages of the SrFe 12 O 19 –based sacrificial material compared with the Fe 2 O 3 -contained material owing to the time proximity of SrFe 12 O 19 decomposition and corium interaction activation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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