Study of LiTiO + 5 mol% TiO lithium ceramics after long-term neutron irradiation

長期間中性子照射した5mol%TiO添加LiTiOセラミックスに関する研究

Chikhray, Y.*; Shestakov, V.*; Maksimkin, O.*; Turubarova, L.*; Osipov, I.*; Kulsartov, T.*; Kuykabayeba, A.*; Tazhibayeva, I.*; 河村 弘; 土谷 邦彦 

Chikhray, Y.*; Shestakov, V.*; Maksimkin, O.*; Turubarova, L.*; Osipov, I.*; Kulsartov, T.*; Kuykabayeba, A.*; Tazhibayeva, I.*; Kawamura, Hiroshi; Tsuchiya, Kunihiko

本論文は、長期間中性子照射した5mol%TiO添加LiTiO微小球の照射後試験結果について記述したものである。照射試料は、Liを96at%濃縮したLiTiO微小球を用い、照射試験はカザフスタン国立原子力センターのWWR-K炉で223日間、熱出力6MWで行った。照射後、白色の微小球が灰色に変化し、密度及び微小硬が低下するとともに、機械的強度も低下した。また、X線回折による結晶構造の測定を行った結果、照射後の結晶構造に変化があることがわかった。さらに、微小球中の残留トリチウム量を明らかにした。

The PIE (Post Irradiation Examinations) results of LiTiO pebbles added with 5 mol% TiO after the long-term irradiation tests are described in this paper. 96 at% Li-enriched LiTiO pebbles were prepared as the irradiation specimens and these specimens were irradiated during 223 days at the reactor power of 6 MWt in the WWR-K of NNC-RK. After neutron irradiation, light-colored pebbles became gray-colored due to structure changes which generation of gray-colored inclusions with low density and microhardness. Crystal structure of the pebbles after the irradiation test were changed from the results of X-ray diffraction measurement. The value of maximum permissible load (pebble crash limit) at that was also low. The residual tritium in the pebbles was measured after the irradiation test.