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Journal Articles

Conceptual study on parasitic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beams in the parasitic gas cell

Sonoda, Tetsu*; Katayama, Ichiro*; Wada, Michiharu*; Iimura, Hideki; Sonnenschein, V.*; Iimura, Shun*; Takamine, Aiko*; Rosenbusch, M.*; Kojima, Takao*; Ahn, D. S.*; et al.

Progress of Theoretical and Experimental Physics (Internet), 2019(11), p.113D02_1 - 113D02_12, 2019/11

AA2019-0315.pdf:1.37MB

 Times Cited Count:0 Percentile:0.01(Physics, Multidisciplinary)

An in-flight separator, BigRIPS, at RIBF in RIKEN provides each experiment with specific nuclides separated from many nuclides produced by projectile fragmentation or in-flight fission. In this process, nuclides other than separated ones are discarded on the slits in BigRIPS, although they include many nuclides interested from the view point of nuclear structure. In order to extract these nuclides for parasitic experiments, we are developing a method using laser ion-source (PALIS). A test experiment with $$^{78}$$Se beam from RIBF has been performed by using a gas cell set in BigRIPS. Unstable nuclides around $$^{67}$$Se were stopped in the gas cell in accordance with a calculation using LISE code. The stopping efficiency has been estimated to be about 30%. As a next step, we will establish the technique for extracting reaction products from the gas cell.

JAEA Reports

Conceptual design of the SlimCS fusion DEMO reactor

Tobita, Kenji; Nishio, Satoshi*; Enoeda, Mikio; Nakamura, Hirofumi; Hayashi, Takumi; Asakura, Nobuyuki; Uto, Hiroyasu; Tanigawa, Hiroyasu; Nishitani, Takeo; Isono, Takaaki; et al.

JAEA-Research 2010-019, 194 Pages, 2010/08

JAEA-Research-2010-019-01.pdf:48.47MB
JAEA-Research-2010-019-02.pdf:19.4MB

This report describes the results of the conceptual design study of the SlimCS fusion DEMO reactor aiming at demonstrating fusion power production in a plant scale and allowing to assess the economic prospects of a fusion power plant. The design study has focused on a compact and low aspect ratio tokamak reactor concept with a reduced-sized central solenoid, which is novel compared with previous tokamak reactor concept such as SSTR (Steady State Tokamak Reactor). The reactor has the main parameters of a major radius of 5.5 m, aspect ratio of 2.6, elongation of 2.0, normalized beta of 4.3, fusion out put of 2.95 GW and average neutron wall load of 3 MW/m$$^{2}$$. This report covers various aspects of design study including systemic design, physics design, torus configuration, blanket, superconducting magnet, maintenance and building, which were carried out increase the engineering feasibility of the concept.

Journal Articles

Cost estimation of uranium collection from seawater with braid type adsorbent

Tamada, Masao; Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 45, 2007/02

Recovery cost of uranium from seawater was estimated on the conditions of annual 1200 ton-scale recovery and 2g-U/kg-adsorbent (hereafter ad) for adsorbent performance after 60 days soaking in seawater. The adsorbent was supposed to be used for 6 times and the six cycles of soaking were carried out annually. In these conditions, the uranium cost was estimated at 88 thousands yen/kg-U. If the repeatability of adsorbent increased up to 18 times, the cost became 48 thousands yen/kg-U. Further increment to 60 times reduced the cost to 34 thousands yen/kg-U. In the marine experiment at Okinawa, 3g-U/kg-ad of uranium adsorption was obtained by dipping an adsorbent chip into seawater for 30 days. This capacity supposed to be extended for 4g-U/kg-ad for 60 days soaking. This adsorption capacity can lead the cost of 25 thousands yen/kg-U at 18 times usage. In this case, initial investment is 108 billions yen which is one third of the construction cost of one million-kW nuclear plant.

Journal Articles

Physics issues and simulation of the JT-60 SA divertor for large heat and particle handling

Asakura, Nobuyuki; Kawashima, Hisato; Shimizu, Katsuhiro; Sakurai, Shinji; Fujita, Takaaki; Takenaga, Hidenobu; Nakano, Tomohide; Kubo, Hirotaka; Higashijima, Satoru; Hayashi, Takao; et al.

Europhysics Conference Abstracts (CD-ROM), 31F, 4 Pages, 2007/00

Divertor design for the JT-60 SA has been progressing in order to handle large heat flux during full pulse duration of 100 s. Divertor should be suitable for single null plasma experiments with the full power injection of 41 MW. The simulation results using 2D fluid (plasma) and Monte-Carlo (neutral) code are summarized. Lower single-null divertor is designed for ITER-like plasma configuration in order to study physics concept of the ITER divertor: control of the plasma detachment. Simulation results for various divertor geometries showed that the vertical target with V-shaped corner can produce plasma detachment near the outer strike-point for medium edge plasma density. It was also demonstrated that the divertor plasma became attached to move the outer strike point above the V-corner, suggesting that recover from sever detachment can be achieved by changing the plasma location. USN divertor will be designed for high-$$beta$$ plasma experiments with the highest shaping plasma of S=6.

Journal Articles

Cost estimation of uranium recovery from seawater with system of braid type adsorbent

Tamada, Masao; Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 5(4), p.358 - 363, 2006/12

Uranium cost in the annual collection of 1200 t-U from seawater was evaluated by using the recovery system of braid type adsorbents synthesized by radiation-induced graft polymerization. The total cost was calculated by summating those in the processes of adsorbent production, uranium recovery, and elution & purification. When the adsorbent performance increased from 2g-U/kg-adsorbent(ad) to 6 g-U/kg-ad, the cost of each process decreased in the same way. The increment of adsorbent durability of 6 times to 60 times reduced the process cost of adsorbent production especially. In the current state of 2 g-U/kg-ad and 6 times usage of adsorbent, the uranium from seawater cost 90 thousands yen/kg-U. The uranium cost becomes 2.5 thousands yen/kg-U in the promising performance of 4 g-U/kg-ad and 18 times usage of adsorbent.

Journal Articles

Nobel system for uranium recovery from seawater

Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*; Tamada, Masao

Nihon Kaisui Gakkai-Shi, 59(5), p.316 - 319, 2005/10

Braid adsorbent having functional group of amidoxime is a promising material for the recovery of uranium dissolved in the seawater. This long braid adsorbent was made by polyethylene multi-fibers in which amidoxime groups were introduced by radiation-induced graft polymerization and subsequent chemical treatment. The braid adsorbent obtained was moored at the offing of Okinawa Island. The average U adsorption of the adsorbent became 1.5 g-U/kg-adsorbent for 30 d soaking. The mooring system for braid adsorbent has possibility which reduced the cost for the recovery of uranium from seawater. Annual product of 1200 tons of uranium needs 134 km$$^{2}$$ of mooring area. In addition, there is 6000 km$$^{2}$$ and more of suitable sea area for the collection of the uranium in the regions from Okinawa Islands to Tosa Bay in Japan.

Journal Articles

Synthesis and practical scale system of braid adsorbent for uranium recovery from seawater

Tamada, Masao; Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*

FAPIG, (169), p.3 - 12, 2005/03

Braid adsorbent having functional group of amidoxime is a promising material for the recovery of uranium dissolved in the seawater. This braid adsorbent was made by polyethylene multi-fibers in which amidoxime groups were introduced by radiation-induced graft polymerization and subsequent chemical treatment. Reaction time for graft polymerization was 5 h and the resulted braid adsorbent had 2.8 mmol/g-adsorbent of amidoxime group. The braid adsorbent obtained was moored at the offing of Okinawa Island. The adsorption of uranium reached 1.5g/kg-adsorbent for 30 d soaking. The mooring system for braid adsorbent has possibility which reduced the cost for the recovery of uranium from seawater. It is shown that 134 km$$^{2}$$ of mooring area is needed for annual product of 1200 tons of uranium. In addition, there is 6000 km$$^{2}$$ and more of suitable sea area for the collection of the uranium in the regions from Okinawa Islands to Tosa Bay in Japan.

Journal Articles

Synthesis and evaluation of long braid adsorbent for recovery of uranium from seawater

Seko, Noriaki; Tamada, Masao; Kasai, Noboru; Yoshii, Fumio; Shimizu, Takao*

Kaiyo Kaihatsu Rombunshu, 20, p.611 - 616, 2004/06

Development of the recovery technology of uranium of storing all over seawater can stable supply of mineral resources over the future. The amidoxime adsorbents used by nonwoven fiber of the shape of cloth produced by the radiation graft polymerization technique. It became clear that their adsorbents of the high form of contact efficiency with seawater are important. Therefore, the braid adsorbents by which contact efficiency with seawater is improved were devised. Moreover, by the mooring system using braid adsorbents, since it counted upon lightweight-ization, i.e., rationalization of the marine structure which occupies the great portion of total cost, in this research, while developing the producing method, performance evaluation was performed, and the production method and the applicability of a recovery system were examined.

Journal Articles

Development of a Real-Time Environmental Radiation Dose Evaluation System for the Vicinity of a Nuclear Facility; A Study of a Real-Time Environmental Radiation Dose Evaluation System

Takeyasu, Masanori; Takeishi, Minoru; Shimizu, Takehiko; Iida, Takao*

Hoken Butsuri, 39(4), p.382 - 390, 2004/00

A computer code system was developed to evaluate a real-time environmental radiation dose when radioactive substances were accidentally released from a nuclear facility. The examination of the system was performed by using the data of air absorbed dose rate observed at monitoring stations and monitoring posts around the Tokai Reprocessing Plant when $$^{85}$$Kr was discharged during its normal operation.

Journal Articles

Long-term perspective of nuclear energy supply using uranium extracted from seawater

Uotani, Masaki*; Shimizu, Takao*; Tamada, Masao

Proceedings of 2003 International Congress on Advances in Nuclear Power Plants (ICAPP '03) (DVD-ROM), 8 Pages, 2003/00

The present paper describes the current technology of uranium recovery from seawater by using radiation-induced graft-adsorbent and the utilization scenario of collected uranium from the viewpoint of long-term perspective of nuclear energy demand in Japan. The several thousand tons of uranium will be required in the latter half of 21st century in Japan, even if the plutonium is practically used in fast breeder reactors (FBRs). This demand of uranium can be supplied by the uranium recovered from seawater if the recovery cost is reasonable. In conclusion, the utilization of uranium from seawater will be able to play an essential role of providing enough time to develop safe and economical FBRs.

Journal Articles

Recovery system for uranium from seawater with fibrous adsorbent and its preliminary cost estimation

Sugo, Takanobu; Tamada, Masao; Seguchi, Tadao; Shimizu, Takao*; Uotani, Masaki*; Kashima, Ryoichi*

Nihon Genshiryoku Gakkai-Shi, 43(10), p.1010 - 1016, 2001/10

 Times Cited Count:13 Percentile:68.69(Nuclear Science & Technology)

The cost of uranium recovered from seawater was estimated by using the amidoxime adsorbent of polymer fibers synthesized by radiation modification, and the technical problems in the recovery system were extracted. The cost of adsorbent materials, storage in seawater for uranium absorption, and the uranium detachment from the adsorbent was estimated respectively in three different systems of the storage in seawater as a buoy, floating body, and chain binding system. The recovery cost of uranium from seawater was estimated to be 8$$sim$$10 times of that from mine uranium. More than 80% of the total cost was occupied by the cost for storage in seawater, which is owing to a weight of metal cage for the holding of adsorbents. The cost can be attained to half by the reduction of the weight to 1/4. One of facing research subject is the improvement of adsorbent ability, since the cost directly depends on the adsorbent performance.

Oral presentation

Environmental monitoring from resident's point of view

Eda, Itsumu*; Omine, Mayumi*; Nemoto, Norimasa*; Shimizu, Tomoko*; Tanaka, Sachiko*; Kashima, Takao*; Ito, Yukari*; Taniyama, Hiroshi*; Kamei, Mitsuru*; Yonezawa, Rika; et al.

no journal, , 

no abstracts in English

Oral presentation

Cost estimation for recovery of uranium from seawater with braid type adsorbent

Tamada, Masao; Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*

no journal, , 

Recovery cost of uranium from seawater was estimated on the conditions of annual 1200 ton-scale recovery and 2g-U/kg-adsorbent (hereafter ad) for adsorbent performance after 60 days soaking in seawater. The adsorbent was supposed to be used for 6 times and the six cycles of soaking were carried out annually. In these conditions, the uranium cost was estimated at 88 thousands yen/kg-U. If the repeatability of adsorbent increased up to 18 times, the cost became 48 thousands yen/kg-U. Further increment to 60 times reduced the cost to 34 thousands yen/kg-U. In the marine experiment at Okinawa, 3g-U/kg-ad of uranium adsorption was obtained by dipping an adsorbent chip into seawater for 30 days. This capacity supposed to be extended for 4 g-U/kg-ad for 60 days soaking. This adsorption capacity can lead the cost of 25 thousands yen/kg-U at 18 times usage. In this case, initial investment is 108 billions yen which is one third of the construction cost of one million-kW nuclear plant.

Oral presentation

Mutation of budding yeast induced by ion beam irradiation

Izumi, Yoshinobu*; Matsuo, Yoichiro*; Sakamoto, Ayako; Takagi, Keiichi*; Hatashita, Masanori*; Kojima, Takao*; Shimizu, Kikuo*

no journal, , 

In cases of ion-beam irradiations, several features of deep interest can be observed, contrasting with the low-LET radiations such as $$gamma$$-rays. In order to elucidate the induction mechanisms of mutations peculiar to ion beams, carbon-ion beams with LETs of 13 keV/$$mu$$m - 107 keV/$$mu$$m and proton beam with LET of 0.45 keV/$$mu$$m were irradiated to budding yeast. Carbon-ion beams and proton beam irradiation were performed in TIARA or HIMAC, and WERC, respectively. After irradiations, survival ratios and mutation frequencies were analyzed as well as sequencing and gene expression analyses. In order to elucidate the molecular mechanisms of mutagenesis caused by radiations, we used ${it ogg1}$ (BER-) which is deficient in the elimination of 8-oxodGTP and ${it msh2}$ (MMR-) deficient in the mismatch-repair function. For comparison, we also used ${it rad50}$ (NHEJ-) and ${it rad52}$ (HR-) that were deficient in the double-strand breaks (DSBs)-repair function.

Oral presentation

Uranium collection from seawater with adsorbent prepared by radiation-induced graft-polymerization

Tamada, Masao; Kasai, Noboru; Seko, Noriaki; Shimizu, Takao*

no journal, , 

The uranium dissolved in seawater is extremely low concentration of 3.3 ppb. However, the total amount of uranium resource in seawater is 4.5 billons tons which is one thousand times of that in terrestrial ores. For uranium collection from seawater, amidoxime group was selected as a high affinity group in adsorbent. This adsorbent was synthesized by grafting of acrylonitrile and subsequent chemical treatment with hydroxylamine. The collection of uranium from seawater was performed in marine experiments at Aomori and Okinawa, Japan. In Aomori, 350 kg of the fibrous adsorbent stacks were dipped at 7 km offing of Aomori seashore. In total 9 tests over three years, 1 kg of uranium could be collected successfully as a yellow cake. A new braid type adsorbent has been developed to achieve the practical cost of uranium collection. The adsorption performance in Okinawa marine experiment indicated 1.5 g-U/kg-ad for 30 day soaking. The promising collection cost reached 25 thousand yen/kg-U which is equivalent to ${$}$96/lb-U$$_{3}$$O$$_{8}$$.

Oral presentation

Design and development of lower divertor for JT-60SA

Sakurai, Shinji; Higashijima, Satoru; Kawashima, Hisato; Shibama, Yusuke; Hayashi, Takao; Ozaki, Hidetsugu; Shimizu, Katsuhiro; Masaki, Kei; Hoshino, Katsumichi; Ide, Shunsuke; et al.

no journal, , 

Lower single null closed divertor with vertical target will be installed at the start of the experiment phase for JT-60 Super Advanced (JT-60SA). Reproducibility of brazed CFC (carbon fiber composite) monoblock targets for a divertor target has been significantly improved by precise control of tolerances and metallization inside CFC blocks. Divertor cassette with fully water cooled plasma facing components and remote handling (RH) system shall be employed to allow long pulse high performance discharges with large neutron yield and they are designed compatible with limited position and size of maintenance ports. Static structural analysis for dead weight, coolant pressure and electromagnetic forces shows that displacement and stress in the divertor module are generally small.

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