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Ueda, Ryoshiro*; Sato, Katsuya; Hayashi, Hidenori*; Narumi, Issey*; Ono, Yutaka
JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 101, 2016/02
Masubuchi, Takashi*; Toguchi, Kazuki*; Hayashi, Hidenori*; Ikenaga, Hiroshi*; Sato, Katsuya; Ono, Yutaka
JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 106, 2016/02
Ueda, Ryoshiro; Sato, Katsuya; Hayashi, Hidenori*; Narumi, Issey*; Ono, Yutaka
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 118, 2015/03
Masubuchi, Takashi*; Hyuga, Hirokazu*; Ueda, Ryoshiro; Hayashi, Hidenori*; Ikenaga, Hiroshi*; Sato, Katsuya; Ono, Yutaka
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 123, 2015/03
Kobayashi, Kazuhiro; Isobe, Kanetsugu; Iwai, Yasunori; Hayashi, Takumi; Shu, Wataru; Nakamura, Hirofumi; Kawamura, Yoshinori; Yamada, Masayuki; Suzuki, Takumi; Miura, Hidenori*; et al.
Nuclear Fusion, 47(12), p.1645 - 1651, 2007/12
Times Cited Count：4 Percentile：11.4(Physics, Fluids & Plasmas)The confinement and removal of tritium are the key subjects for safety of ITER. The ITER buildings are confinement barriers of tritium. In a hot cell building, tritium is often released, as vapor and is in contact with the inner walls. Also those of an ITER tritium plant building will be exposed to tritium in an accident. However, the data are scarce, especially on the penetration of tritium into the concrete of the wall materials. The tritium released in the buildings is removed by the Atmosphere Detritiation Systems (ADS), where the tritium is oxidized by catalysts and is removed as water. Special gas of SF
is used in ITER, and is expected to be released in an accident such as fire. Although the SF gas has the potential as a catalyst poison, the performance of ADS with the existence of SF has not been confirmed yet. Tritiated water is produced in the regeneration process of ADS, and is subsequently processed by the ITER Water Detritiation System (WDS). One of the key components of WDS is an electrolysis cell. The electrolysis cell is made of organic compounds, and there is no data on the durability of the cell exposed to tritium. To overcome these issues in a global tritium confinement, a series of experimental studies have been carried out as an ITER R&D task: (1) tritium behavior in concrete; (2) effect of SF on performance of ADS; and (3) tritium durability of electrolysis cell of ITER-WDS.
Kobayashi, Kazuhiro; Miura, Hidenori*; Hayashi, Takumi; Hoshi, Shuichi; Yamanishi, Toshihiko
Fusion Science and Technology, 52(3), p.711 - 715, 2007/10
Times Cited Count：3 Percentile：25.51(Nuclear Science & Technology)The tritium released in the building is removed by Atmosphere Detritiation System (ADS), where the tritium is oxidized by catalysts and is removed as water. Special gas of SF is used as an electric insulation gas in ITER, and is expected to be released in an accident such as fire. Although SF has the potential as a catalyst poison, the performance of ADS with the existence of SF has not been confirmed yet. Therefore, to study the effect of SF, the performance tests of ADS was carried out with air containing 
1% of hydrogen, 1% of methane and 1% of SF. The SF gas was notably decomposed in the case of the catalyst temperature higher than 673 K. In addition, a part of the water produced by the 473 K catalyst was reduced to hydrogen due to the reaction with the decomposed gas in SF. Consequently, the detritiation factor of ADS was decreased to less than 50 from 
1000 of its initial value.
Kobayashi, Kazuhiro; Isobe, Kanetsugu; Iwai, Yasunori; Hayashi, Takumi; Shu, Wataru; Nakamura, Hirofumi; Kawamura, Yoshinori; Yamada, Masayuki; Suzuki, Takumi; Miura, Hidenori*; et al.
Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 8 Pages, 2007/03
no abstracts in English
Kobayashi, Kazuhiro; Terada, Osamu*; Miura, Hidenori*; Hayashi, Takumi; Nishi, Masataka
Fusion Science and Technology, 48(1), p.476 - 479, 2005/07
Times Cited Count：10 Percentile：56.74(Nuclear Science & Technology)To construct the ITER with high safety and acceptability, it is necessary to establish and to ensure the tritium safe handling technology. The performance of the detritiation system at the off-normal events has not been confirmed well. To obtain performance data of detritiation system at the off normal events, the detritiation experiment was performed at TPL/JAERI using a scaled detritiation system for the oxidation performance test. The detritiation system consists of two oxidation catalyst beds (473K and 773K) and a molecular sieve drying absorber. Basic performance of the detritiation system for hydrogen and methane in air was evaluated under maximum ventilation flow rate. Obtained oxidation efficiency was more than 99.99% for hydrogen in the catalyst bed of 473K and more than 99.9% for methane in the 773K one, respectively. It was confirmed that these performances were maintained even under carbon dioxide , carbon monoxide if oxygen remained in the process gas.
Tomizawa, Yuki*; Hayashi, Hidenori*; Masubuchi, Takashi*; Kamiyama, Osamu*; Sato, Katsuya; Narumi, Issei; Ikenaga, Hiroshi*
no journal, ,
no abstracts in English
Sato, Katsuya; Ueda, Ryoshiro; Masubuchi, Takashi*; Kamiyama, Osamu*; Hayashi, Hidenori*; Ikenaga, Hiroshi*; Narumi, Issey*; Tanaka, Atsushi
no journal, ,
We have previously obtained high ethyl caproate producing Sake yeasts "No.227" and "No.1333" by ion beam breeding. The fatty acid synthase genes (
and 
) and the fatty acid esterase genes (
and 
) might be involved in the higher production of ethyl caproate in the mutant strains. In this study, to identify the mutation sites of the mutant strains, each gene locus was sequenced. For the , and loci, all the mutations found in mutant strains are nonsense mutations, suggesting that these mutations did not involved in the higher production of ethyl caproate. On the other hand, strains No.227 and No.1333 carried G/A and A/A mutations in gene at nucleotide position 3,748 as heterozygous and homozygous states, respectively. This result strongly suggested that the higher production of ethyl caproate in strains No.227 and No.1333 is attributed to a dominant mutation in gene.
Sato, Katsuya; Masubuchi, Takashi*; Kamiyama, Osamu*; Ueda, Ryoshiro; Hayashi, Hidenori*; Ikenaga, Hiroshi*; Narumi, Issey*
no journal, ,
Sake is a useful tool for promoting local industry, but sake consumption has been decreasing year by year. In Gunma prefecture, the Gunma industrial technology center has playing a central role in breeding original sake yeast. Furthermore, for quickly corresponding with the needs from market, JAEA have tried breeding of sake yeast by ion beam breeding technology for development of distinctive sake yeast and its practical use while closely coordinating with the Gunma industrial technology center. As a result, the high ethyl caproate producing novel sake yeast were obtained.
Masubuchi, Takashi*; Kamiyama, Osamu*; Ueda, Ryoshiro; Ikenaga, Hiroshi*; Hayashi, Hidenori*; Sato, Katsuya; Narumi, Issey*
no journal, ,
We have previously obtained high ethyl caproate producing Sake yeasts "No.227" and "No.1333" by ion beam breeding. The fatty acid synthase genes ( and ) and the fatty acid esterase genes ( and ) might be involved in the higher production of ethyl caproate in the mutant strains. In this study, to identify the mutation sites of the mutant strains, each gene locus was sequenced. For the , and loci, all the mutations found in mutant strains are nonsense mutations, suggesting that these mutations did not involved in the higher production of ethyl caproate. On the other hand, strains No.227 and No.1333 carried G/A and A/A mutations in gene at nucleotide position 3,748 as heterozygous and homozygous states, respectively. This result strongly suggested that the higher production of ethyl caproate in strains No.227 and No.1333 is attributed to a dominant mutation in gene.
Ueda, Ryoshiro; Sato, Katsuya; Hayashi, Hidenori*; Narumi, Issey*; Ono, Yutaka
no journal, ,
no abstracts in English
Masubuchi, Takashi*; Hyuga, Hirokazu*; Ikenaga, Hiroshi*; Hayashi, Hidenori*; Sato, Katsuya; Ono, Yutaka
no journal, ,
no abstracts in English
Ueda, Ryoshiro; Sato, Katsuya; Hayashi, Hidenori*; Narumi, Issey*; Ono, Yutaka
no journal, ,
no abstracts in English
Ikenaga, Hiroshi*; Tomizawa, Yuki*; Hikokubo, Kazuya*; Hayashi, Hidenori*; Masubuchi, Takashi*; Kamiyama, Osamu*; Sato, Katsuya; Narumi, Issey*
no journal, ,
no abstracts in English
Ueda, Ryoshiro*; Sato, Katsuya; Ono, Yutaka; Hayashi, Hidenori*; Narumi, Issey*
no journal, ,
no abstracts in English
Masubuchi, Takashi*; Toguchi, Kazuki*; Ikenaga, Hiroshi*; Hayashi, Hidenori*; Sato, Katsuya; Ono, Yutaka
no journal, ,
no abstracts in English
