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Mukai, Satoru*; Umehara, Ryuji*; Hanawa, Satoshi; Kasahara, Shigeki; Nishiyama, Yutaka
Proceedings of 20th International Conference on Water Chemistry of Nuclear Reactor Systems (NPC 2016) (USB Flash Drive), 9 Pages, 2016/10
In Japanese PWR, the concentration of dissolved hydrogen in the primary coolant is controlled in the range from 25 cc/kg-H
O to 35 cc/kg-HO for suppression of water decomposition. However this concentration is desired to reduce for the purpose of radiation source reduction in Japan. So, the concentration due to water radiolysis in primary coolant was evaluated at lower hydrogen concentration by the water radiolysis model in consideration of 
ray, fast neutron and alpha ray due to the reaction 
B(n,
)
Li. The results of evaluation showed that the water radiolysis was suppressed even if the hydrogen concentration was decreased to 5 cc/kg-HO. The effects of the different G-value and the rate constants of major reaction on the concentration of HO and O were studied under hydrogen addition. We also focused on the effect of the alpha radiolysis in boron acid water.
Hayashi, Takumi; Ito, Takeshi*; Kobayashi, Kazuhiro; Isobe, Kanetsugu; Nishi, Masataka
Fusion Engineering and Design, 81(8-14), p.1365 - 1369, 2006/03
Times Cited Count：19 Percentile：76.85(Nuclear Science & Technology)In a fusion reactor, high-level tritiated water of more than GBq/ml will be generated and stored temporally in the various areas. High level tritiated water decomposes by itself and generates hydrogen and oxygen, and becomes to tritiated hydrogen peroxide water, however, effective G-values from tritiated water are different from those obtained -ray experiments in our previous report. Furthermore, tritiated water of about 250GBq/ml has been stored for several years safely and checked its characteristics. Using the above experiences, this paper summarizes safety requirements for storage of high-level tritiated water and discusses design issues of the safety storage system. Concerning gaseous species, storage tank should be maintained at negative pressure and purged periodically or constantly to dedicated tritium removal system. Specially, it is important that the G-value of high-level tritiated water is increasing with decreasing the tritium concentration. The pH and ORP (Oxidation Reduction Potential) of tritiated water have been also changed depending on the tritium concentration and maintained for more than several years in glass vessel. High-level tritiated water of more than GBq/ml was acid and became to be corrosive depending on the dissolved species. Large amount of tritiated water will be stored in the various tanks of stainless steel, therefore, it should be monitored so that the liquid situation is maintained not to be corrosive.
Taguchi, Mitsumasa; Kojima, Takuji
JAEA-Review 2005-001, TIARA Annual Report 2004, p.181 - 182, 2006/01
The yields of OH radicals in water containing phenol have been investigated for several ten MeV/n C ion and Ne ion having the same LET value, as a function of the residual ion energy at the specific depth in water. In this study, beside such energy dependence, the dependence of reaction time of OH radical yield was examined by changing the concentration of phenol as solute. The defferential G'-values of OH radicals, those G-values per kinetic energy of ions increase with specific energy of Ne ions. The G'-value just after irradiation(1.5ns) is relatively high but become lower with reaction time to be the value (2.7) obtained for 
Co -rays. It suggests the diffusion behavior of OH radicals locally induced in water.
Tabata, Yoneho*; Oshima, Akihiro
Macromolecular Symposia, 143, p.337 - 358, 1999/08
Times Cited Count：34 Percentile：76.44(Polymer Science)no abstracts in English
Oshima, Akihiro; Seguchi, Tadao; Tabata, Yoneho
Polymer International, 48, p.996 - 1003, 1999/00
Times Cited Count：24 Percentile：67.42(Polymer Science)no abstracts in English
*; *; *; Tabata, Yoneho*; Seguchi, Tadao; *
Radiation Physics and Chemistry, 54(2), p.165 - 171, 1999/00
Times Cited Count：76 Percentile：97.54(Chemistry, Physical)no abstracts in English
*; *; *; Seguchi, Tadao; Tabata, Yoneho*
Radiation Physics and Chemistry, 55(4), p.399 - 408, 1999/00
Times Cited Count：15 Percentile：72.53(Chemistry, Physical)no abstracts in English
Oshima, Akihiro; Seguchi, Tadao; Tabata, Yoneho*
Proceedings of IUPAC World Polymer Congress 37th International Symposium on Macromolecules (MACRO 98), P. 56, 1998/00
no abstracts in English
*; Ikeda, Shigetoshi*; Kudo, Hisaaki; Seguchi, Tadao; Tabata, Yoneho*
Radiation Physics and Chemistry, 50(6), p.611 - 615, 1997/00
Times Cited Count：58 Percentile：95.76(Chemistry, Physical)no abstracts in English
Hama, Yoshimasa*; *; Hamanaka, Kenichi*; Matsumoto, Hideya*; Kudo, Hisaaki; Sasuga, Tsuneo; Seguchi, Tadao; *
Proceedings of of the Yayoi Symposium on Ion-Beam Radiation Chemistry; NIRS-M-101, HIMAC-007, 0, p.9 - 12, 1994/00
no abstracts in English
Arakawa, Kazuo
Journal of Polymer Science Part A-1, 25, p.1713 - 1716, 1987/00
no abstracts in English
Arakawa, Kazuo; Seguchi, Tadao; Yoshida, Kenzo
Radiation Physics and Chemistry, 27(2), p.157 - 163, 1986/00
no abstracts in English
Hayakawa, Naohiro; ; *; *; *; Seguchi, Tadao
Radiation Physics and Chemistry, 25(1-3), p.399 - 409, 1985/00
no abstracts in English
Arakawa, Kazuo; Seguchi, Tadao
Kobunshi Rombunshu, 41(12), p.733 - 738, 1984/00
Times Cited Count：5 Percentile：38.51(Polymer Science)no abstracts in English
;
JAERI-M 83-126, 113 Pages, 1983/08
no abstracts in English
Arakawa, Kazuo; Nakanishi, Hiroshi*; Hayakawa, Naohiro
Nucl.Techonl., 61, p.533 - 539, 1983/00
Times Cited Count：2 Percentile：35.25(Nuclear Science & Technology)no abstracts in English
solvent mixture in the presence of aqueous solution;
Journal of Radioanalytical Chemistry, 67(2), p.329 - 337, 1981/00
no abstracts in English
-IrradiationArakawa, Kazuo; Hayakawa, Naohiro; Kuriyama, Isamu
JAERI-M 7244, 29 Pages, 1977/09
no abstracts in English
and H ions with the initial energies of 1 and 0.1MeVOno, Shinichi
Bulletin of the Chemical Society of Japan, 48(7), p.2229 - 2230, 1975/07
Times Cited Count：1no abstracts in English
Ono, Shinichi; ; *; *
Bulletin of the Chemical Society of Japan, 48(7), p.2153 - 2157, 1975/07
Times Cited Count：18no abstracts in English
