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Abe, Toru*; Hirano, Fumio; Mihara, Morihiro; Honda, Akira
Genshiryoku Bakkuendo Kenkyu (CD-ROM), 27(1), p.3 - 11, 2020/06
Degradation of TRU waste in a geological disposal facility may cause the formation of a nitrate plume. A Nitrate Evolution model due to mineral reactions, microbial activity, and metal corrosiON (NEON) has therefore been developed to evaluate the safety case for geological disposal of TRU waste. Small scale laboratory experiments can be reproduced satisfactorily, however, it is necessary to demonstrate the applicability of the NEON model on scales relevant to the geological disposal of TRU waste. In the current study, an industrial analogue of a nitrate plume from the pollution of groundwater from nitrate fertilizers used on Ikuchi Island, Japan was selected to test the applicability of the NEON model. Concentration profiles of nitrate ions in the groundwater were successfully reproduced over the hundreds of meters scale demonstrating the applicability of the NEON model in evaluating the chemical behavior of a nitrate plume derived from the geological disposal of TRU waste.
Fukumoto, Masahiro; Nishikawa, Yoshiaki*; Kagawa, Akio; Kawamura, Kazuhiro
JNC TN8400 2001-002, 23 Pages, 2000/12
JNC-TN8400-2001-002.pdf:0.55MB
The soluble organic compounds generated by radiological degradation of asphalt (
ray) were confirmed as a part of influence of the bituminized waste degradation in the TRU waste repository. Especially, the influence of the nitrate was focused on. As a result, the concentration of the soluble organic compounds generated by radiological degradation of asphalt (10MGy, ray which is correspond to absorbed dose of asphalt for 1,000,000 years) were lower (each formic acid : about 50mg/dm
, acetic acid : about 30mg/dm and oxalic acid : about 2mg/dm) than that of the formic acid, the acetic acid and the oxalic acid which Valcke et al. had shown (the influence of the organic at the solubility examination which uses Pu and Am). Moreover, the change in the concentration of TOC and the soluble organic compounds (formic acid, acetic acid and oxalic acid) is little under the existence of nitrate ion. That is, the formic acid and acetic acid which can be organic ligands were generated little by oxidative decomposition of asphalt in the process that nitrate ion becomes nitrite ion by radiation. The influence of the soluble organic compounds by the radiological degradation of the asphalt ( ray) on adsorption and solubility by the complexation of radionuclides in the performance assessment can be limited.
Yaita, Tsuyoshi; Narita, Hirokazu*; Suzuki, Shinichi; Tachimori, Shoichi; Motohashi, Haruhiko; Shiwaku, Hideaki
Journal of Radioanalytical and Nuclear Chemistry, 239(2), p.371 - 375, 1999/00
Times Cited Count：95 Percentile：98.36(Chemistry, Analytical)no abstracts in English
Matsumoto, Shiro*; Tajima, Yasunori*; Koga, Jiro*; Miyahara, Yukari*
PNC TJ1609 98-001, 26 Pages, 1998/02
no abstracts in English
La NMR relaxation and chemical shift studies in the aqueous nitrate and chloride SolutionsYaita, Tsuyoshi; ; Tachimori, Shoichi
Journal of Physical Chemistry B, 102(20), p.3886 - 3891, 1998/00
Times Cited Count：26 Percentile：62.03(Chemistry, Physical)no abstracts in English
; Kubota, Masumitsu
Journal of Nuclear Science and Technology, 26(11), p.1038 - 1044, 1989/11
Times Cited Count：24 Percentile：88.99(Nuclear Science & Technology)no abstracts in English
Sasaki, Shoji*; Kanemaru, Ryota*; Matsuura, Hirotaka*; Ihara, Toshihiro*; Seko, Noriaki
no journal, ,
no abstracts in English
Kanemaru, Ryota*; Sasaki, Shoji*; Matsuura, Hirotaka*; Ihara, Toshihiro*; Seko, Noriaki
no journal, ,
no abstracts in English
Okura, Minoru; Mihara, Morihiro; Honda, Akira
no journal, ,
A model of nitrate evolution (NEON) has been developed to estimate the nitrate impact on geological disposal and includes mineral reaction, microbial activity and metal corrosion. Each reaction model was found to provide satisfactory predictions of laboratory results. Nitrate polluted groundwater from agricultural activity also provides a useful analogue study to improve the reliability of NEON. Despite a number of uncertainties in model parameterization, NEON was able to predict the general trends of nitrate concentration in the groundwater with microbial activity likely controlling nitrate reduction.
Izeki, Takashi*; Kanemaru, Ryota*; Matsuura, Hirotaka*; Ihara, Toshihiro*; Ueki, Yuji; Seko, Noriaki
no journal, ,
no abstracts in English
Sasaki, Shoji*; Kanemaru, Ryota*; Matsuura, Hirotaka*; Ihara, Toshihiro*; Seko, Noriaki
no journal, ,
no abstracts in English
Abe, Toru*; Hirano, Fumio; Mihara, Morihiro; Honda, Akira
no journal, ,
no abstracts in English
Shimizu, Koki
no journal, ,
no abstracts in English
Shimizu, Koki; Koyama, Hayato; Hagiwara, Masayoshi
no journal, ,
no abstracts in English
/
/ radiolysis, 3; Effects of gaseous-phase radiolysis on water under irradiationHata, Kuniki; Kimura, Atsushi*; Sato, Tomonori; Taguchi, Mitsumasa*; Kato, Chiaki; Watanabe, Yutaka*
no journal, ,
no abstracts in English
