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ultrathin films on van der Waals ferromagnet CrSiTe
Kato, Takemi*; Sugawara, Katsuaki*; Ito, Naohiro*; Yamauchi, Kunihiko*; Sato, Takumi*; Oguchi, Tamio*; Takahashi, Takashi*; Shiomi, Yuki*; Saito, Eiji; Sato, Takafumi*
Physical Review Materials (Internet), 4(8), p.084202_1 - 084202_6, 2020/08
Times Cited Count：4 Percentile：20.11(Materials Science, Multidisciplinary)Hata, Kuniki; Sato, Tomonori; Motooka, Takafumi; Ueno, Fumiyoshi; Hanawa, Satoshi; Kasahara, Shigeki; Tsukada, Takashi
Journal of Nuclear Science and Technology, 53(8), p.1183 - 1191, 2016/08
Times Cited Count：6 Percentile：49.05(Nuclear Science & Technology)Shirai, Nobutoshi; Miura, Yasushi; Tachibana, Ikuya; Omori, Satoru; Wake, Junichi; Fukuda, Kazuhito; Nakano, Takafumi; Nagasato, Yoshihiko
JAEA-Technology 2016-007, 951 Pages, 2016/07
JAEA-Technology-2016-007-01.pdf:11.93MBJAEA-Technology-2016-007-02.pdf:4.7MB
The periodic safety review of TRP is to confirm the safety activities and get effective additional measures the facility safety and its reliability. We implemented 4 items; for (1) evaluation of safety activity implementation, we confirmed we are adequately expanding its safety activities by the necessary documents and schemes. For (2) evaluation of status of safety activities reflecting the latest technical knowledges, we confirmed we reflect latest knowledges for improvement of safety and reliability. For (3) technical evaluation about aging degradation, we can keep the safety of the facilities important to safety and the sea discharge line, under assumption of the present maintenance, because of "focuses for aging degradation". For (4) planning measures about a 10-years-plan that the operator shall implement to keep the facility condition, by the technical evaluation, we found no additional safety plans into maintenance strategies.
Motooka, Takafumi; Sato, Tomonori; Yamamoto, Masahiro
Nihon Genshiryoku Gakkai Suikagaku Bukai Bukaiho, 7 (Internet), 2 Pages, 2015/03
At the Fukushima Daiichi Nuclear Power Plant, the seawater was injected into Spent Fuel Pool (SFP) after the accident in March 2013. It is considered that corrosion in SFP will be accelerated by the seawater injection. To prevent the corrosion, Tokyo Electronic Power Company injected hydrazine into SFP. We confirmed the hydrazine injection effect in a short time by irradiation test.
Nakano, Takafumi; Sato, Fuminori; Shirozu, Hidetomo; Nakanishi, Ryuji; Fukuda, Kazuhito; Tachibana, Ikuya
Nihon Genshiryoku Gakkai-Shi ATOMO
, 57(1), p.14 - 20, 2015/01
no abstracts in English
Fukuda, Kazuhito; Tomioka, Kenichiro*; Omori, Satoru; Nakano, Takafumi; Nagasato, Yoshihiko
JAEA-Technology 2014-032, 566 Pages, 2014/11
JAEA-Technology-2014-032.pdf:32.45MBJAEA-Technology-2014-032(errata).pdf:9.54MB
The Periodic Safety Review of TRP is assessment of the validity of safety activities in order to get assurance for continuous operation by adding effective items to extract and to execute for TRP safety. We performed 4 items; for (1) evaluation of safety activity at TRP, as we confirmed organization was ordered and managed. For (2) evaluation of status of safety activities reflecting the latest knowledge, we confirmed improvement of safety was continued adequately reflecting from the experience for safety. For (3) technical review on aging for the safety related structures, systems and components, we evaluated the guaranty of safety under assumption of continuous maintenance till the next Periodic Safety Review. For (4) establishment of long term maintenance program, we found no additional activities into maintenance programs, however, for several installations we established a plan and utilized them for reliability.
-ray irradiation on the deoxygenation of salt-containing water using hydrazineMotooka, Takafumi; Sato, Tomonori; Yamamoto, Masahiro
Journal of Nuclear Science and Technology, 50(4), p.363 - 368, 2013/03
Times Cited Count：7 Percentile：49.06(Nuclear Science & Technology) ray irradiation on deoxygenation by hydrazine in artificial seawaterMotooka, Takafumi; Sato, Tomonori; Yamamoto, Masahiro
Nihon Genshiryoku Gakkai Wabun Rombunshi, 11(4), p.249 - 254, 2012/12
At the spent nuclear fuel pools in the Fukushima Dai-ichi Nuclear Power Plant, hydrazine has been added to reduce dissolved oxygen in the pool water containing salts. The reduction behavior of dissolved oxygen in seawater with hydrazine in the presence of radiation is unknown. The effect of ray irradiation on deoxygenation by hydrazine in artificial seawater was investigated at room temperature. We placed the artificial seawater with small amount of hydrazine under ray irradiation at dose rates of 0.3 
7.5 kGy/h. The concentration of dissolved oxygen in the solutions was measured before and after the irradiation. The concentration of dissolved oxygen hardly decreased in the absence of radiation in a few hours, whereas the concentration of dissolved oxygen markedly decreased in the presence of radiation. The concentration of dissolved oxygen decreased with irradiation time. At this moment, hydrazine concentration was decreased more than twice the dissolved oxygen concentration. This shows that a part of radiolysis products of hydrazine act as deoxidizers. Dissolved oxygen in artificial seawater could be decreased by small addition of hydrazine in the presence of radiation at room temperature.
Kitamura, Takafumi; Hanai, Tasuku; Sato, Ikken
Nihon Genshiryoku Gakkai-Shi ATOMO, 53(8), p.569 - 575, 2011/08
Japan is a country far away from Europe and the US. The news of the accident occurred in this country was immediately reached to countries throughout the world and the image of the explosion was repeated on TV screens. This accident aroused various discussions on nuclear policy. The responses of countries divided with the US and France maintaining the stance of promoting nuclear power and Germany and Italy clarifying its policy to withdraw from nuclear energy. This report provides information on the responses to the accident taken by the US and other states.
collisions at 
= 200 and 62.4 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06
Times Cited Count：184 Percentile：99.45(Physics, Nuclear)Transverse momentum distributions and yields for 
, and 
in collisions at = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different collisions. We also present the scaling properties such as 
and 
scaling and discuss the mechanism of the particle production in collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.
and Au+Au collisions at 
= 200 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.
Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04
Times Cited Count：9 Percentile：49.6(Physics, Nuclear)Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.
; ; Kurosawa, A.; Hayashi, Naomi; Kobayashi, Kentaro; Kitajima, Takafumi; Sato, Yoshihiko
PNC TN8410 98-047, 278 Pages, 1998/02
The fire and explosion incident occurred at the Bituminization Demonstration Facility of the Tokai Reprocessing Plant on march 11th, 1997. For investigation of Bituminization Demonstration Facility Incident and prevention relapse, Investigation Group for Bituminization Demonstration Facility incident was set up. It has been investigated the situation at the time of incident was occurred. The result of investigated was presented for Science and Technology Agency. This report is arranged the result of investigated the situation for investigation and prevention relapse.
Maeda, Shigetaka; Okawachi, Yasushi; Aoyama, Takafumi; Sato, Osamu*
no journal, ,
no abstracts in English
Yamamoto, Masaya; Kawahara, Hirotaka; Isozaki, Kazunori; Aoyama, Takafumi; Sato, Ikken; Ohshima, Hiroyuki
no journal, ,
no abstracts in English
Yamamoto, Masaya; Kawahara, Hirotaka; Terakado, Tsuguo; Aoyama, Takafumi; Sato, Ikken; Ohshima, Hiroyuki
no journal, ,
CDF caused by ATWS (Anticipated Transient Without Scram) event and PLOHS (Protected Loss of Heat Sink) event are majority of CDF in probabilistic safety study at Joyo. Evaluation of these values by reactor dynamic characteristics analysis and natural convection analysis are conducted with a detailed success standard. It was found from evaluation result that CDF are quite low and a dominant core damage accident is UTOP (Unprotected Transient Over Power) event.
Motooka, Takafumi; Sato, Tomonori; Yamamoto, Masahiro
no journal, ,
The effect of ray irradiation on deoxidation in aqueous solution by hydrazine was investigated using pure water and artificial sea water at room temperature. We placed the solutions with small amount of hydrazine at ray irradiation field. The concentration of dissolved oxygen in the solutions was measured before and after ray irradiation. Concentration of dissolved oxygen was not decreased without ray irradiation, while concentration of dissolved oxygen was markedly decreased for one hour ray irradiation even at low dose rate. It is suggested that the hydrazine addition to spent nuclear fuel pool water is effective as a method for decreasing concentration of dissolved oxygen.
Sato, Tomonori; Motooka, Takafumi; Kato, Chiaki; Yamamoto, Masahiro
no journal, ,
The evaluation and the suitable countermeasures for the corrosion of the materials in spent nuclear fuel storage pool containing salinity is needed in Fukushima Daiichi Nuclear Power Station. In the fuel storage pool, the water containing sea water is irradiated. In this study, the water radiolysis calculation was performed to determine the corrosive condition in the fuel storage pool. Generation of 2 ppm of hydrogen peroxide magnitude was confirmed in the water with 8ppm of dissolved oxygen. The concentration of hydrogen peroxide decreased with oxygen concentration. This result indicated that the deaeration will be effective to mitigate the corrosive condition.
Tanaka, Kenichi*; Fukahori, Tokio; Yamamoto, Masahiro; Sato, Tomonori; Motooka, Takafumi; Okumura, Keisuke; Shibata, Keiichi; Iwamoto, Nobuyuki
no journal, ,
The meaning and plan on development of standard and fundamental databases for material compositions and activation cross sections are introduced. Those database is important for estimation of radioactive nuclide production, which is necessary for safety management and waste estimation for disusing procedure of nuclear plants.
ray irradiation on deoxidation in aqueous solution by addition of hydrazineMotooka, Takafumi; Sato, Tomonori; Yamamoto, Masahiro
no journal, ,
The effect of ray irradiation on deoxydation in aqueous solution by hydrazine was investigated using pure water and artificial sea water at room temperature. Concentration of dissolved oxygen was not decreased without ray irradiation, while concentration of dissolved oxygen was markedly decreased for one hour ray irradiation. It is believed that the small hydrazine addition to spent nuclear fuel pool water is effective as a method for decreasing concentration of dissolved oxygen.
ray irradiation on deoxidation in aqueous solution by hydrazineMotooka, Takafumi; Sato, Tomonori; Yamamoto, Masahiro
no journal, ,
The effect of ray irradiation on deoxidation in aqueous solution by hydrazine was investigated using pure water and artificial sea water at room temperature. We placed the solutions with small amount of hydrazine at ray irradiation field at dose rates of 0.3-7.5 kGy/h. The concentration of dissolved oxygen in the solutions was measured before and after ray irradiation. Concentration of dissolved oxygen was not decreased without ray irradiation, while concentration of dissolved oxygen was markedly decreased for one hour ray irradiation, which is under detection limit at higher dose rate over 2 kGy/h. It is believed that the hydrazine addition to spent nuclear fuel pool water is effective as a method for decreasing concentration of dissolved oxygen.
