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Asada, Naoki; Sasaki, Shunichi; Rachi, Reona; Komori, Tsuyoshi; Suzuki, Hisanori; Takeuchi, Kenji; Uchida, Naoki
Nihon Hozen Gakkai Dai-20-Kai Gakujutsu Koenkai Yoshishu, p.5 - 8, 2024/08
no abstracts in English
Yokochi, Masaru; Sasaki, Shunichi; Yanagibashi, Futoshi; Asada, Naoki; Komori, Tsuyoshi; Fujieda, Sadao; Suzuki, Hisanori; Takeuchi, Kenji; Uchida, Naoki
Nihon Hozen Gakkai Dai-20-Kai Gakujutsu Koenkai Yoshishu, p.1 - 4, 2024/08
Tokai Reprocessing Plant, which is shifted to decommissioning stage, stores large amount of high-level radioactive liquid waste (HLLW) generated by reprocessing of spent nuclear fuels in High-level Active Waste facility (HAW). Radioactive risk related to HLLW has been concentrated in HAW until the completion of vitrification. Natural disasters such as earthquake may damage cooling function of HAW. Therefore, HAW must improve earthquake resistance, as exchanging the ground around HAW facility and pipe trench by concrete. This earthquake resistance construction starts from July of 2020 and completed in March 2024. This report summarizes the construction work and describes the inspection results after the construction.
-edgesIshimatsu, Naoki*; Sasada, Ryohei*; Maruyama, Hiroshi*; Ichikawa, Takayuki*; Miyaoka, Hiroki*; Kimura, Toru*; Tsubota, Masami*; Kojima, Yoshitsugu*; Tsumuraya, Takao*; Oguchi, Tamio*; et al.
Journal of Physics; Conference Series, 190, p.012070_1 - 012070_4, 2009/11
Times Cited Count：7 Percentile：83.90(Physics, Condensed Matter)We have investigated the effect of hydrogenation on La 
and 
electronic states in metallic LaH
by X-ray absorption near edge structure at the La -edges. As the hydrogen content 
increases from 0 to 2.6, white-line intensity at the La 
-edges shows a remarkable increase in the range of 
2.0. This is interpreted as the increase in La hole induced by interstitial H atoms on the octahedral sites. On the other hand, the shoulder structure at the La 
-edge disappears in the process of = 0.0 
2.0, indicating that the 
-
hybridization is weakened by H atoms on the tetrahedral sites. This study demonstrates that H atoms on the two interstitial H sites provide different contribution to the modification of the electronic states.
Nishimura, Arata*; Okano, Kunihiko*; Ikebe, Yasushi*; Oba, Kyoko; Kasada, Ryuta*; Sakamoto, Ryuichi*; Sawa, Naoki*; Ishii, Yasutomo*; Kashiwagi, Mieko*; Takenaga, Hironobu*; et al.
no journal, ,
no abstracts in English
Inose, Kenta; Ouchi, Masayuki; Tobita, Ryuto; Aoki, Kenji; Asada, Naoki; Kusaka, Shota; Morita, Kazuki; Oyama, Koichi; Sumi, Hirotaka; Nakabayashi, Hiroki
no journal, ,
At the Tokai Reprocessing Plant, safety measures have been taken to maintain important safety functions in the High Active Liquid Waste Storage Facility (HAW) and Tokai Vitrification Facility (TVF), which handle high active liquid waste, in accordance with new regulatory requirements and assuming the occurrence of internal events such as fire and flooding. Fire prevention measures were taken to prevent the occurrence of fires, detect and extinguish fires, and mitigate the impact of fires. Flooding measures were taken to effects of submersion, water coverage, and steam due to flooding. In addition to measures against internal hazards, measures for external hazards and accident response measures have been completed, improving the safety of the HAW and TVF.
