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C+p reactionNakayama, Shinsuke; Watanabe, Yukinobu*
no journal, ,
In the effect assessment on healthy cells in particle therapy, the charged particle emission spectra from nuclear reactions on light element (e.g., C, N, O) constituting a living body are important as fundamental data. Unlike medium-heavy nuclei, nuclear reactions on light nuclei can cause particle emission from a discrete state of residual nuclei. The effect of this emission process on the spectra is analyzed using the nuclear reaction code CCONE, taking the C+p reaction as an example. As a result, the reproducibility the experimental proton and alpha-particle emission spectra is largely improved by considering particle emission from discrete states of residual nuclei. This result indicates that it is important to consider particle emission from discrete states of residual nuclei in the calculation of particle emission spectra from nuclear reactions on light nuclei.
I and 
I using ANNRI at MLF/J-PARCRovira Leveroni, G.; Kimura, Atsushi; Nakamura, Shoji; Endo, Shunsuke; Iwamoto, Osamu; Iwamoto, Nobuyuki; Toh, Yosuke; Segawa, Mariko; Maeda, Makoto; Katabuchi, Tatsuya*
no journal, ,
Uesawa, Shinichiro; Ono, Ayako; Yamashita, Susumu; Yoshida, Hiroyuki
no journal, ,
To evaluate the thermal behavior of fuel debris in PCVs of TEPCO's Fukushima Daiichi Nuclear Power Station for air cooling, JAEA has developed a numerical simulation method with JUPITER. The previous work reported JUPITER with a porous medium model was capable to calculate thermal behavior of a porous medium. In this report, we report the result of the preliminary numerical analysis of thermal behavior in the PCV of Fukushima Daiichi Nuclear Power Station Unit 2. The numerical result showed air in the RPV and the pedestal was heated with fuel debris, and natural convection was generated. Therefore, the numerical simulation method is expected to evaluate the thermal behavior in the PCV for air cooling.
Sasaki, Yuji; Kaneko, Masashi; Ban, Yasutoshi
no journal, ,
Using TODGA and ADAAM, which are developed by JAEA, the recovery of total amounts of An and Ln, and mutual separation of Am/Cm have been achieved. Recent studies give the very high SF(An/Ln) over 100 and show the different chemical behavior between An and Ln, using solvent extraction of tri, tetradentate extractant and masking agent. We confirm these conditions to satisfy the subsequent ones, to maintain the suitable concentrations of extractants and masking agents for Ln recovery, and to show high SF using sets of D values over and under 1. In the presentation, we will show the difficulties of An/Ln separation and direction of researches, and present the SF(An/Ln) using various extractants and masking agents.
Ono, Ayako; Okamoto, Kaoru*; Makino, Yasushi*; Hosokawa, Shigeo*; Yoshida, Hiroyuki
no journal, ,
JAEA has been developing an advanced neutronic/thermal-hydraulics coupling simulation system. In the system, the detailed thermal-hydraulics codes JUPITER and TPFIT, which are based on an interface-capturing method, will be adopted to simulate thermal-hydraulics in a fuel bundle. The experimental data and findings relating to the two-phase flow in a fuel bundle are needed to validate JUPITER and TPFIT. In this study, we propose a new measurement method to measure the bubbly flow in a narrow channel, such as a subchannel, by combining laser-doppler velocimetry and photodiodes. The proposed measurement method is cross-checked by a conductance probe and is confirmed for its validity.
Endo, Shunsuke; Kawamura, Shiori*; Tsuchikawa, Yusuke; Mishima, Kenji*; Kimura, Atsushi; Nakamura, Shoji; Iwamoto, Osamu; Iwamoto, Nobuyuki; Rovira Leveroni, G.
no journal, ,
no abstracts in English
Sato, Junya; Kuramochi, Ryo*; Shimizu, Koki; Matsumoto, Saori; Taniguchi, Takumi; Kuroki, Ryoichiro; Osugi, Takeshi
no journal, ,
no abstracts in English
Nakamura, Mizuki; Sato, Junya; Nakata, Hisakazu; Sakai, Akihiro; Osugi, Takeshi
no journal, ,
no abstracts in English
Naruse, Keiji; Matsui, Kazuaki; Obata, Ikuhito; Sawazaki, Hiromasa; Goto, Takehiro; Jo, Takahisa
no journal, ,
no abstracts in English
Nishino, Yuki; Kuramoto, Shimpei; Naruse, Keiji; Nishino, Hajime; Goto, Takehiro; Takeuchi, Toru
no journal, ,
no abstracts in English
rays using PHITS and GEANT4 codesShikaze, Yoshiaki
no journal, ,
Among the radioactive nuclides emitted inside the nuclear reactor buildings by the Fukushima Daiichi nuclear reactor accident, high-energy beta-ray sources such as strontium-90 and yttrium-90 generate bremsstrahlung photons in the materials which constitute wall, floor and interior structure of the building. Therefore, evaluation of the bremsstrahlung radiation dose to the workers in the nuclear reactor building is important for radiation exposure management. To investigate calculation precision of the bremsstrahlung dose evaluation, the results of PHITS and GEANT4 codes were compared. In the calculation, behind various shielding plates the water cylinder was set, and the deposited energy spectrum and absorbed dose in the water cylinder by the bremsstrahlung were compared in this presentation.
Isobe, Yuta; Hayashi, Takehiro; Tanigaki, Takanori; Miyoshi, Nobuaki; Kawanago, Sho; Obata, Ikuhito; Kobayashi, Takanori
no journal, ,
no abstracts in English
Kim, M.; Yoshimura, Kazuya; Sakuma, Kazuyuki; Malins, A.*; Abe, Tomohisa; Nakama, Shigeo; Machida, Masahiko; Saito, Kimiaki
no journal, ,
The dynamics of radiocesium differs depending on the ground surface coverage, and a detailed environmental model was created and Monte Carlo simulation analysis was conducted to quantitatively evaluate the effects of these differences on the reduction of air dose rates in urban areas. As a result, it was confirmed that the presence of human activities in urban areas promotes the decay of air dose rates.
Iwamoto, Nobuyuki
no journal, ,
no abstracts in English
Maeda, Makoto; Komeda, Masao; Toh, Yosuke
no journal, ,
no abstracts in English
Be thermal scattering law data considering crystallite size, 1; Critical experiment analysisKonno, Chikara
no journal, ,
Recently European Spallation Source group reported that the thermal scattering law data of Be changed with the crystallite size of beryllium. We calculated the effective multiplication factor for the critical experiment MIX-MET-FAST-007 with JENDL-5 and the ESS thermal scattering law data of Be. The calculation results indicated that the effective multiplication factor decreased as the crystallite size of beryllium increased in the cases where the beryllium reflector was thicker than 16 cm.
Taniguchi, Yoshinori; Udagawa, Yutaka
no journal, ,
no abstracts in English
Ouchi, Kazuki; Kitatsuji, Yoshihiro; Maeda, Shigetaka; Takaki, Naoyuki*
no journal, ,
In previous study, we have studied the purification process for efficient recovery of Ac-225 produced by neutron irradiation of Ra-226 in a fast reactor. In this presentation, the reuse process for re-irradiating Ra-226 after separation of Ac-225 was studied by using Ba and La as alternative elements. By using Ln resin as adsorbent and changing the nitric acid concentration, the conditions under which Ra can be isolated from impurities expected to be produced by irradiation were clarified. We propose a purification process for Ac using DGA resin and a recycling process for Ra using Ln resin.
Sasaki, Yuto; Sano, Aaru; Itagaki, Wataru; Maeda, Shigetaka; Takaki, Naoyuki*
no journal, ,
no abstracts in English
Taniguchi, Takumi; Kuramochi, Ryo*; Sakamoto, Ryo*; Osawa, Norihisa*; Kaneda, Yoshihisa*; Matsuzawa, Kazuki*; Yamamoto, Takeshi*; Kuroki, Ryoichiro; Osugi, Takeshi
no journal, ,
no abstracts in English