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Journal Articles

A Modelling study on water radiolysis for primary coolant in PWR

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$$_{2}$$O to 35 cc/kg-H$$_{2}$$O 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 $$gamma$$ ray, fast neutron and alpha ray due to the reaction $$^{10}$$B(n,$$alpha$$)$$^{7}$$Li. The results of evaluation showed that the water radiolysis was suppressed even if the hydrogen concentration was decreased to 5 cc/kg-H$$_{2}$$O. The effects of the different G-value and the rate constants of major reaction on the concentration of H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ were studied under hydrogen addition. We also focused on the effect of the alpha radiolysis in boron acid water.

Journal Articles

Safety handling characteristics of high-level tritiated 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:18 Percentile:20.63(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 $$gamma$$-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.

Journal Articles

Time-dependence of differential G-values of OH radicals in water under Ne ion radiolysis

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 $$^{60}$$Co $$gamma$$-rays. It suggests the diffusion behavior of OH radicals locally induced in water.

Journal Articles

Temperature dependence of radiation effects on polymers

Tabata, Yoneho*; Oshima, Akihiro

Macromolecular Symposia, 143, p.337 - 358, 1999/08

 Times Cited Count:32 Percentile:23.79(Polymer Science)

no abstracts in English

Journal Articles

Radiation-induced free radicals and their behaviour in crosslinked polytetrafluoroethylene(PTFE)

Oshima, Akihiro; Seguchi, Tadao; Tabata, Yoneho

Polymer International, 48, p.996 - 1003, 1999/00

 Times Cited Count:21 Percentile:34.7(Polymer Science)

no abstracts in English

Journal Articles

Evidence for radiation induced crosslinking in polytetrafluoroethylene by means of high-resolution solid-state F high-speed MAS NMR

*; *; *; Tabata, Yoneho*; Seguchi, Tadao; *

Radiation Physics and Chemistry, 54(2), p.165 - 171, 1999/00

 Times Cited Count:69 Percentile:2.63(Chemistry, Physical)

no abstracts in English

Journal Articles

Temperature effects on radiation induced phenomena in polystyrene having atactic and syndiotactic structures

*; *; *; Seguchi, Tadao; Tabata, Yoneho*

Radiation Physics and Chemistry, 55(4), p.399 - 408, 1999/00

 Times Cited Count:13 Percentile:29.79(Chemistry, Physical)

no abstracts in English

Journal Articles

Radiation induced free radicals and its behaviors in crosslinked polytetrafluoroethylene (PTFE)

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

Journal Articles

Temperature effects on radiation induced phenomena in polytetrafluoroethylene (PTFE); Change of G-value

*; Ikeda, Shigetoshi*; Kudo, Hisaaki; Seguchi, Tadao; Tabata, Yoneho*

Radiation Physics and Chemistry, 50(6), p.611 - 615, 1997/00

 Times Cited Count:53 Percentile:4.47(Chemistry, Physical)

no abstracts in English

Journal Articles

Micro profile of the chemical structure in ion-beam irradiation effects for some polyolefins

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

Journal Articles

Oxygen consumption and gas evolution by radiation-induced oxidation in ethylene-propylene diene terpolymers

Arakawa, Kazuo

J.Polym.Sci.,Part A-1, 25, p.1713 - 1716, 1987/00

no abstracts in English

Journal Articles

Radiation-induced gas evolution in chlorine-containing polymer.Poly(vinyl chloride),chloroprene rubber,and chlorosulfonated-polyethylene

Arakawa, Kazuo; Seguchi, Tadao; Yoshida, Kenzo

Radiation Physics and Chemistry, 27(2), p.157 - 163, 1986/00

no abstracts in English

Journal Articles

Radiation-crosslinking of polyethylene model compounds

Hayakawa, Naohiro; ; *; *; *; Seguchi, Tadao

Radiation Physics and Chemistry, 25(1-3), p.399 - 409, 1985/00

no abstracts in English

Journal Articles

Oxygen consumption and oxidation region by rasiation-induced oxidation in polyethylene and ethylene-propylene copolymer

Arakawa, Kazuo; Seguchi, Tadao

Kobunshi Rombunshu, 41(12), p.733 - 738, 1984/00

 Times Cited Count:5 Percentile:61(Polymer Science)

no abstracts in English

Journal Articles

Radiation-induced gas evolution from commercial lubricant base oil

Arakawa, Kazuo; Nakanishi, Hiroshi*; Hayakawa, Naohiro

Nucl.Techonl., 61, p.533 - 539, 1983/00

no abstracts in English

Journal Articles

Radiolysis of DEHPA-CCI$$_{4}$$ solvent mixture in the presence of aqueous solution

;

J.Radioanal.Chem., 67(2), p.329 - 337, 1981/00

no abstracts in English

JAEA Reports

The Quntitative Analysis of Gas Evolved from High Polymer by $$gamma$$-Irradiation

Arakawa, Kazuo; Hayakawa, Naohiro; Kuriyama, Isamu

JAERI-M 7244, 29 Pages, 1977/09

JAERI-M-7244.pdf:0.81MB

no abstracts in English

Journal Articles

Calculation of the ionization yield in He by incident Ar$$^{+}$$ and H$$^{+}$$ ions with the initial energies of 1 and 0.1MeV

Ono, Shinichi

Bulletin of the Chemical Society of Japan, 48(7), p.2229 - 2230, 1975/07

 Times Cited Count:1

no abstracts in English

Journal Articles

The Calculation of the primary radiolysis yield of water vapor irradiated by 10-keV electrons

Ono, Shinichi; ; *; *

Bulletin of the Chemical Society of Japan, 48(7), p.2153 - 2157, 1975/07

 Times Cited Count:18

no abstracts in English

23 (Records 1-20 displayed on this page)