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Sugawara, Takanori; Eguchi, Yuta; Obayashi, Hironari; Iwamoto, Hiroki; Tsujimoto, Kazufumi
Nuclear Engineering and Design, 331, p.11 - 23, 2018/05
Times Cited Count：12 Percentile：73.93(Nuclear Science & Technology)This study aims to perform the coupled analysis for the feasible beam window concept. To mitigate the design condition, namely to reduce the necessary proton beam current, subcriticality adjustment rod (SAR) was installed to the ADS core. The burnup analysis was performed for the ADS core with SAR and the results indicated that the maximum proton beam current during the burnup cycle was reduced from 20 to 13.5 mA. Based on the burnup analysis result, the coupled analysis; particle transport, thermal hydraulics and structural analyses, was performed. As the final result, the most robust beam window design; the hemisphere shape, the outer radius = 235 mm, the thickness at the top of the beam window = 3.5 mm and the factor of safety for the buckling = 9.0, was presented. The buckling pressure was 2.2 times larger than the previous one and more feasible beam window concept was presented through this study.
Meigo, Shinichiro; Matsuda, Hiroki; Iwamoto, Hiroki
Proceedings of 13th International Topical Meeting on Nuclear Applications of Accelerators (AccApp '17) (Internet), p.396 - 402, 2018/05
no abstracts in English
Meigo, Shinichiro; Nishikawa, Masaaki; Iwamoto, Hiroki; Matsuda, Hiroki
EPJ Web of Conferences, 146, p.11039_1 - 11039_4, 2017/09
Times Cited Count：2 Percentile：77.83(Nuclear Science & Technology)no abstracts in English
Sasa, Toshinobu; Umeno, Makoto*; Mizubayashi, Hiroshi*; Mori, Keijiro*; Futakawa, Masatoshi; Saito, Shigeru; Kai, Tetsuya; Nakai, Kimikazu*; Zako, Akira*; Kasahara, Yoshiyuki*; et al.
JAERI-Tech 2005-021, 114 Pages, 2005/03
JAERI-Tech-2005-021.pdf:9.66MB
To perform the research and development for accelerator-driven system (ADS), Japan Atomic Energy Research Institute (JAERI) plans to build a Transmutation Experimental Facility under the JAERI-KEK joint J-PARC program. Transmutation Experimental Facility consists of two buildings, Transmutation Physics Experimental Facility to make reactor physics experiment with subcritical core, and ADS Target Test Facility for the preparation of irradiation database for various structural materials. In this report, purpose to build, experimental schedule, and design study of the ADS target test facility with drawer type spallation target are summarized.
Kogawa, Hiroyuki; Ishikura, Shuichi*; Haga, Katsuhiro; Kinoshita, Hidetaka; Kaminaga, Masanori; Hino, Ryutaro
Proceedings of ICANS-XVI, Volume 3, p.1295 - 1304, 2003/07
no abstracts in English
Teraoku, Takuji*; Terada, Atsuhiko*; Maekawa, Fujio; Meigo, Shinichiro; Kaminaga, Masanori; Ishikura, Shuichi*; Hino, Ryutaro
JAERI-Tech 2003-026, 77 Pages, 2003/03
JAERI-Tech-2003-026.pdf:19.78MB
A 1-MW spallation neutron source aiming at materials and life science researches will be constructed under the JAERI-KEK Proton Accelerator Project(J-PARC). The proton beam window functions as a boundary wall between a high vacuum area and a helium atmosphere and it is cooled by light water because high heat-density is generated in the window material by interactions with the proton beam. Then, uniformity of the water flow is requested at the window to suppress a hot-spot that causes excessive thermal stress and cooling water boiling. Also, the window has to be strong enough in its structure for inner stress due to water pressure and thermal stress due to heat generation. In this report, we propose two types of proton beam windows, flat-type and curved-type. We evaluated the strength of structure and thermal hydraulic analysis. As a result, it was found that sufficient heat removal was assured with uniform water flow at the window, and the stress could be maintained below allowable stress values. Accordingly, it was confirmed that the proton beam window designs were feasible.
Kinoshita, Hidetaka; Terada, Atsuhiko*; Kaminaga, Masanori; Hino, Ryutaro
JAERI-Tech 2001-061, 43 Pages, 2001/10
JAERI-Tech-2001-061.pdf:5.21MB
no abstracts in English
Sunaga, Hiromi; Okada, Sohei; Takizawa, Haruki; ; Kawasuso, Atsuo; Yotsumoto, Keiichi
Proceedings of 23rd Linear Accelerator Meeting in Japan, p.313 - 315, 1998/00
no abstracts in English
; Takizuka, Takakazu; Takada, Hiroshi; *; *
Proc. of 2nd Int. Conf. on Accelerator-Driven Transmutation Technologies and Applications, 2, p.210 - 216, 1996/06
no abstracts in English
Iwamoto, Hiroki; Nishihara, Kenji; Iwamoto, Yosuke; Hashimoto, Shintaro; Sato, Tatsuhiko
no journal, ,
no abstracts in English
Sugawara, Takanori
no journal, ,
To reduce the burden of the geological disposal of high-level waste (HLW), the Japan Atomic Energy Agency (JAEA) has investigated an accelerator-driven system (ADS) to transmute minor actinide (MA) included in HLW. Since the ADS is a hybrid system of an accelerator and a subcritical core, there are various inherent issues in the research and development of the ADS. As one of the critical issues, the design of a beam window which is a boundary of the accelerator and the subcritical core, has been pointed out. In this study, a new beam window concept was investigated by the coupled analysis of neutronics, particle transport, thermal hydraulics and structural analyses. Through these coupled analyses, feasible beam window concept was presented.
Oi, Motoki; Hosokawa, Hidemitsu*; Nishikawa, Masaaki*; Fukuda, Shimpei; Teshigawara, Makoto; Meigo, Shinichiro; Takada, Hiroshi
no journal, ,
At J-PARC, a neutron production target is installed in the helium vessel, and 3-GeV proton beams are delivered from a 3-GeV synchrotron to the target through a beamline with high vacuum environment. A proton beam window (PBW) is installed to isolate the helium vessel from the proton beamline. Since the PBW is degraded by radiation damage, it is scheduled to be replaced every 2 or 3 years under the 1-MW operation. In the summer outage in 2017, the PBW #2 was replaced to #3. A shielding cask was used for transferring the activated PBW, while hands-on works were done to remove the cooling water pipes at the top of the shielding plug of PBW. Since the cooling water contains 5
10
Bq/cc of tritium, it was drained from the pipes and the pipes were dried before removing PBW. The hands-on work was carried out in a green-house with a local exhaust device to prevent scattering of radioactive materials. In this presentation, we report the replacement work of the PBW including safety measures.
Okubo, Nariaki; Fujimura, Yuki; Kitamura, Akane; Okuno, Yasuki
no journal, ,
Japan atomic energy agency has been conducting research activities for developing the accelerator driven system (ADS), which is expected to reduce and transmute radioactive wastes involved in spent fuels by nuclear power plants. The ADS adopts a liquid metal of lead-bismuth eutectic (LBE) as a coolant and also spallation target to produce high energy neutrons. In this study, effect of irradiation on corrosion behavior was evaluated for 316L stainless steel and T91 ferritic martensitic steel, which are candidate materials of ADS target window, through the immersion test under LBE with saturated and low oxygen concentration followed by ion irradiation experiment. In the case of soaking in LBE with saturated oxygen concentration for SS316L steels at 450
C, 330 hrs, non-irradiated region did not show clear oxide layer, however, irradiated region showed bi-layers of magnetite and spinel type oxides. The formation rate of oxide layer for irradiated region, 26 
m/year, was about twice faster than that of non-irradiated region, 12 m/year. This result suggests that diffusion behavior after irradiation and mass transfer in the interface between LBE and steel surface is important for understanding of irradiation effect on liquid metal corrosion.
Okubo, Nariaki; Fujimura, Yuki
no journal, ,
The accelerator driven system (ADS) adopts a liquid metal of lead-bismuth eutectic (LBE) as a coolant and also spallation target to produce high energy neutrons. In this study, irradiation effect on the corrosion behavior was evaluated for the compativility of 316L stainless steel, which is candidate material of ADS target window, through the immersion test under LBE with saturated and low oxygen concentration followed by ion irradiation experiment. In the case of soaking in LBE with saturated oxygen concentration for SS316L steels at 450C, 330 hrs, non-irradiated region did not show clear oxide layer, however, irradiated region showed bi-layers of magnetite and spinel type oxides. The formation rate of oxide layer for irradiated region was about twice faster than that of non-irradiated region. This result suggests that diffusion behavior after irradiation and mass transfer in the interface between LBE and steel surface is important for understanding of irradiation effect on liquid metal corrosion.
