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溶融SUS316の垂直分光放射率,熱容量,熱伝導率測定

Measurements of normal spectral emissivity, heat capacity and thermal conductivity of liquid SUS316

東 英生*; 福山 博之*; 西 剛史*; 山野 秀将  

Higashi, Hideo*; Fukuyama, Hiroyuki*; Nishi, Tsuyoshi*; Yamano, Hidemasa

原子炉のシビアアクシデント時の炉心損傷メカニズムを理解するためには、溶融ステンレス鋼(SUS316)の熱物性値が必要である。本研究では、電磁浮遊法を用いて、液体SUS316の垂直分光放射率, 熱容量, 熱伝導度を測定した。垂直分光放射率は負の波長依存性があり、温度に対する依存性は無視できる程度であった。熱容量と熱伝導度は非接触レーザー周期加熱を用いて測定した。熱容量は1661K$$sim$$1778Kの温度範囲で一定を示した。熱伝導度は正の温度依存性を示した。

Thermophysical properties of molten stainless steel (SUS316) are necessary to understand a core degradation mechanism in severe accidents of nuclear reactors. In this study, the normal spectral emissivity, heat capacity and thermal conductivity of liquid SUS316 were measured using an electromagnetic levitation technique in a dc magnetic field. The normal spectral emissivity has a negative wavelength dependence, and a negligible temperature dependence. The heat capacity and thermal conductivity of liquid SUS316 were measured using the noncontact laser modulation calorimetry. The heat capacity presents a constant value at a temperature range from 1661 to 1778 K. The thermal conductivity has a positive temperature dependence.

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