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Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Yoshinaka, Kazuyuki; Otsuka, Masahiro*; Hoshino, Masato; Kikuchi, Kenji; Kawata, Tsuyoshi; Taki, Kiyotaka
Nihon Genshiryoku Gakkai Wabun Rombunshi, 7(3), p.268 - 279, 2008/09
The fluorescent liquid penetrant test equipment, for welding part in the evaporator for phosphate liquid waste generated by solvent waste treatment at Tokai reprocessing plant, was developed. It is composed of CCD camera and UV light for observation, sprinkling nozzles for fluorescent liquid, washing water and drying air, and positioning mechanism, which could be arranged position of the equipment to inspection object by 3 axes operation, insert length, bending angle and turn angle. Also, the equipment could be inserted by way of the nozzle, which inside diameter is 60 mm, into the evaporator for inspection. It was confirmed that it could be observed the standard faults, which was defined in JIS, by the equipment. Then, fluorescent liquid penetrant test for the evaporator, which has treated phosphate liquid waste for 18 years, and which heating temperature was about 105 centigrade degree, was done. As the result of the test, it was not observed fault in the evaporator.
Sakanaka, Shogo*; Ago, Tomonori*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; Harada, Kentaro*; Hiramatsu, Shigenori*; Honda, Toru*; et al.
Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06
Future synchrotron light sources based on the energy-recovery linacs (ERLs) are expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation. Our Japanese collaboration team is making efforts for realizing an ERL-based hard X-ray source. We report recent progress in our R&D efforts.
Kawata, Tsuyoshi; Kojima, Hiroshi; Kanamaru, Yoshiyuki; Wakayama, Yoshinori
no journal, ,
no abstracts in English
Hashimoto, Kazuichi; Kawata, Tsuyoshi; Nagayama, Mineo; Komoto, Norio; Shoji, Kenji; Choki, Toshiyuki; Sasaki, Hirofumi; Kashimura, Takao; Kinoshita, Shigemi*
no journal, ,
no abstracts in English
Ishii, Takayuki; Kawata, Tsuyoshi; Choki, Toshiyuki
no journal, ,
Approximately 70 valves (three-part ball valves) are installed in cells related to the low-radioactive liquid waste treatment process at the Tokai Reprocessing Plant. In order to prevent liquid leakage from the joints of these valves, we investigated the relationship between the sealing material of the joints and the tightening force of bolts, practiced maintenance management of the valves using a bolt/nut tightening management method (torque management) that takes into account the characteristics of gaskets (PTFE), and report the results obtained.
Takada, Tsuyoshi; Tsutsumi, Hideaki*; Kawata, Manabu
no journal, ,
The 2006 seismic design review guide requires results of their site-specific probabilistic seismic hazard assessment (PSHA) for setting Design Basis Ground Motions (DBGMs) to verify seismic safety of Nuclear Power Plants (NPPs). All electric utilities have submitted their results of their DBGMs to the NRA (Nuclear Regulatory Authority) together with the results of their PSHA. The AEPs (Annual Exceedance Probabilities) of DBGMs reflect not only the site-specific physical earthquake environment but also degree of design conservatisms which each electric utility wants to maintain for their NPPs. The present paper, based on the publicly available documents submitted to NRA, demonstrates the AEPs of the DBGMs of 16 NPPs in Japan and shows the regulatory requirements as well as utilities' decision by statistically analyzing the AEPs, which certainly can lead to risk-informed decision-making activities for nuclear safety assurance in Japan.
Komoto, Norio; Sasaki, Hirofumi; Kawata, Tsuyoshi; Taki, Kiyotaka; Kinoshita, Shigemi*
no journal, ,
no abstracts in English
Yoshinaka, Kazuyuki; Hoshino, Masato; Kikuchi, Kenji; Kawata, Tsuyoshi; Taki, Kiyotaka; Otsuka, Masahiro*
no journal, ,
no abstracts in English
