Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Ozu, Akira; Takase, Misao*; Haruyama, Mitsuo; Kurata, Noritaka*; Kobayashi, Nozomi*; Tobita, Hiroshi; Kureta, Masatoshi; Nakamura, Tatsuya; To, Kentaro; Suzuki, Hiroyuki; et al.
no journal, ,
no abstracts in English
Shibata, Keiichi
no journal, ,
Although JENDL-4.0 was released in 2010, the high-energy cross sections of about 40 FP nuclides were not re-examined due to the time limit. Tellurium is one of such data which were not revised in the high-energy region. Considering the significance of the activation cross sections of tellurium, the present work was undertaken to evaluate the neutron cross sections of 
Te in the energy from 10
eV to 20 MeV. The statistical model code CCONE, which was based on the Hauser-Feshbach theory, was used to evaluate cross sections above 10 eV. Parameters required as input to the CCONE code were determined by reflecting the latest knowledge on nuclear physics. As for the neutron optical model parameters, we employed the values obtained by Kunieda et al. using the coupled-channel method. The evaluated results reproduce existing experimental data very well.
Nagai, Takayuki; Okamoto, Yoshihiro; Kano, Shigeru; Nishizawa, Daiji; Seki, Katsumi*; Homma, Masanobu*; Kobayashi, Hiromi*; Ayame, Yasuo
no journal, ,
no abstracts in English
Tc and 
I in the keV regionIwamoto, Nobuyuki
no journal, ,
no abstracts in English
Inose, Takehiko*; Nishizawa, Daiji; Oyama, Koichi; Miyauchi, Atsushi; Nagai, Takayuki
no journal, ,
no abstracts in English
Okagaki, Yuria; Shibamoto, Yasuteru; Sun, Haomin; Satou, Akira; Yonomoto, Taisuke
no journal, ,
no abstracts in English
Nakano, Masanao
no journal, ,
Since the remote sensing technique for the meteorological observation has been developing these years, the Doppler Lidar is available in the commercial market. Although some investigation organizations carried out the examination on the method and application of Doppler Lidars and had generally good results, the duration of the examination was limited in a short period. So it is unknown whether the Doppler Lidar is applicable to the long-term meteorological observation in the nuclear facilities to assess the public dose around nuclear facilities. Therefore, the long-term performance and applicability of a small Doppler Lidar has been examined. As the result, the Doppler Lidar was satisfied with the national guideline, and the data at 100 m above sea level had a good relationship with the propeller data,. Additionally, the Doppler Lidar could obtain the data even in the storm condition. From this fact, the Doppler Lidar used in this examination is considered to have a practicability for the dose assessment of the public.
Saito, Kimiaki
no journal, ,
no abstracts in English
Terada, Hiroaki; Nagai, Haruyasu
no journal, ,
no abstracts in English
Nagai, Haruyasu; Tsuzuki, Katsunori; Kobayashi, Takuya; Terada, Hiroaki
no journal, ,
no abstracts in English
Sato, Isamu; Onishi, Takashi; Hirosawa, Takashi; Tanaka, Kosuke; Osaka, Masahiko; Koyama, Shinichi; Tokoro, Daishiro*; Ishigamori, Toshio*; Seki, Takayuki*; Shinada, Masanori*; et al.
no journal, ,
As a material simulating FP, CsI was heated and evaporated to be decomposited on the surface of a tube having a temperature gradient. Gaseous B
O
made by heating it at higher temperature was react with CsI decomposited on the surface, and then the boron effects for decomposition and migration behavior of Cs and I were observed. Consequently, it was indicated that boron vapor could strip decomposited CsI to make it gaseous species again and then the guseous CsI could move to the colder position.
Katsuyama, Jinya; Yamaguchi, Yoshihito; Kaji, Yoshiyuki; Yoshida, Hiroyuki
no journal, ,
no abstracts in English
Okano, Yasushi; Yamano, Hidemasa
no journal, ,
There has been an increased concern in the safety of NPP for external hazards, one of which is a forest fire. Conventional forest fire assessments have been performed with deterministic and conservative manner, using so-called envelope initial and boundary conditions on forest fire analyses. In this study, the forest fire hazard assessment methodology, which is subject to an external-hazard probabilistic risk assessment (PRA), is being developed in order to quantitatively evaluate frequency and consequence of the forest fire that has a potential impact on a NPP and then to obtain the Core Damage Frequency. The new methodology based on a logic tree is developed in this study, as well as the sensibility analyses on weather conditions.
Higashiuchi, Atsushi; Maeda, Koji; Otani, Akira; Sasaki, Shinji; Katsuyama, Kozo; Chigira, Takayuki*; Murata, Hirotoshi*
no journal, ,
no abstracts in English
Saito, Kimiaki
no journal, ,
no abstracts in English
Nakayama, Masashi; Miura, Norihiko*; Ishida, Tomoko*; Takeda, Nobufumi*; Niunoya, Sumio*; Jo, Mayumi*
no journal, ,
no abstracts in English
Nakajima, Motoki; Hirose, Takanori; Tanigawa, Hisashi; Tanigawa, Hiroyasu; Enoeda, Mikio
no journal, ,
no abstracts in English
Np in spent nuclear fuel using anion-exchange porous polymeric filterAsai, Shiho; Hanzawa, Yukiko; Konda, Miki; Suzuki, Daisuke; Magara, Masaaki; Kimura, Takaumi; Ishihara, Ryo*; Saito, Kyoichi*; Yamada, Shinsuke*; Hirota, Hideyuki*
no journal, ,
no abstracts in English
Iwai, Yasunori
no journal, ,
Hydrophobic platinum catalysts have been widely applied in the field of nuclear fusion such as to the exchange reactions of hydrogen isotopes between hydrogen and vapor and to the oxidation reactions of tritium. Hydrophobic platinum catalysts are hardly susceptible to water mist and water vapor. Hydrophobic platinum catalysts are produced by supporting platinum directly on hydrophobic polymer beads. For the hydrophobic polymer, styrene divinyl benzene (SDB) has been applied in Japan. It can be pointed out that the betterment in catalytic activity of hydrophobic catalyst is expected to downsize the catalytic reactor based on a hard look at a large increase in flow rate in future. The acute change in catalytic activity of two types of commercial Pt/SDB catalysts was found when they were irradiated with electron beams. After irradiation with electron beams, the catalytic activity was evaluated by means of overall reaction rate constant for the oxidation of tritium. The overall reaction rate constant increased as increase in dose. The constant showed the peak value in the dose between 500 to 1000 kGy. After the peak, the constant decreased as increase in dose. The overall reaction rate constant at the peak was 6 times larger than that evaluated with unirradiated. The mechanical strength of irradiated Pt/SDB kept sound until 1500 kGy. The irradiation is a promising method to the betterment in catalytic activity of Pt/SDB catalyst.
Kamei, Miho; Ozawa, Takayuki
no journal, ,
The future fast reactor (FR) cycle system to reduce radioactive waste volume by recycling Pu and minor actinides (MA), and it is important to evaluate the influence of high Pu content and MA content on oxide fuel performance. In this study, we investigated the influence of fuel characteristics on power-to-melt (PTM) from a viewpoint to prevent fuel melting. As a result, PTM of FR oxide fuel with high Pu content and MA content would be affected by fuel properties due to fuel composition, but it revealed that a correlation between fuel specifications and PTM in MA-containing MOX fuel would be similar to that in MOX fuel, and it can be mentioned that thermal performance of MA-containing MOX fuel would be secured to be equal to that of conventional MOX fuels by providing suitable fuel specifications up to MA content of 5 wt.%.