Sasa, Toshinobu; Saito, Shigeru; Obayashi, Hironari; Sugawara, Takanori; Wan, T.; Yamaguchi, Kazushi*; Yoshimoto, Hidemitsu
NEA/CSNI/R(2017)2 (Internet), p.111 - 116, 2017/06
Japan Atomic Energy Agency (JAEA) proposes to reduce the environmental impact caused from high-level radioactive waste by using Accelerator-driven system (ADS). To realize ADS, JAEA plans to build the Transmutation Experimental Facility (TEF) within the framework of J-PARC project. For the JAEA-proposed ADS, lead-bismuth eutectic alloy (LBE) is adopted as a coolant for subcritical core and spallation target. By using TEF in J-PARC, we are planning to solve technical difficulties for LBE utilization by completion of the data for the design of ADS. The 250kW LBE spallation target will be located in TEF facility to prepare material irradiation database. Various R&Ds for important technologies required to build the facilities are investigated such as oxygen content control, instruments development, remote handling techniques for target maintenance, and spallation target design. The large scale LBE loops for 250kW target mock up and material corrosion studies are also manufactured and ready for various experiments. The latest status of 250kW LBE spallation target optimization will be described in the presentation.
Saito, Shigeru; Okubo, Nariaki; Obayashi, Hironari; Sasa, Toshinobu
NEA/CSNI/R(2017)2 (Internet), p.195 - 200, 2017/06
An ADS (Accelerator Driven System) for waste transmutation investigated in JAEA employs LBE (Lead-Bismuth Eutectic) as spallation target material and core coolant. To realize future ADS and an ADS target experimental facility (TEF-T) planned for construction in J-PARC, there are many technical issues on LBE. In particular, corrosion data of relevant materials like T91 (Mod. 9Cr-1Mo) and SS316L steels at 400-550C under oxygen concentration controlled and flowing condition are indispensable. JAEA has designed and built new LBE corrosion test loop named OLLOCHI (Oxygen-controlled LBE LOop Corrosion tests in HIgh-temperature), to obtain the corrosion data at the higher temperature. The piping of high temperature sections was made by T91 and 2.25Cr-1Mo steel. The maximum temperature of these parts is 550C. At low temperature sections, piping and components were made by SS316L and the maximum temperature is limited to 450C. The status for the OLLOCHI as of March 2016 is that the some modification and the conditioning operation without LBE have already finished. The oxygen sensors and the oxygen control system will be installed soon. After that, the conditioning operation with LBE and oxygen control test will be started. And more, additional flow meters will be installed in each test section until next March. In parallel with these tests, thermal hydraulic analysis of the two test sections will be performed to identify the flow pattern in the specimen holders.
Wan, T.; Obayashi, Hironari; Sasa, Toshinobu
NEA/CSNI/R(2017)2 (Internet), p.117 - 127, 2017/06
Obayashi, Hironari; Hirabayashi, Masaru; Sasa, Toshinobu; Ara, Kuniaki
NEA/CSNI/R(2017)2 (Internet), p.188 - 194, 2017/06
no abstracts in English
Oizumi, Akito; Sugawara, Takanori; Iwamoto, Hiroki; Nishihara, Kenji; Tsujimoto, Kazufumi
NEA/NSC/R(2017)2, p.152 - 160, 2017/06
Sugawara, Takanori; Yamaguchi, Kazushi; Obayashi, Hironari; Saito, Shigeru; Yoshimoto, Hidemitsu; Sasa, Toshinobu
no journal, ,
JAEA is planning to build a Transmutation Experimental Facility (TEF) for R&D on volume reduction and mitigation of harmfulness of high-level radioactive waste by using an Accelerator-Driven System (ADS). In the ADS Target Test Facility (TEF-T) of the TEF, a liquid lead-bismuth eutectic (LBE) target will be irradiated with a high-power (250 kW) proton beam, and irradiation effects on structural materials will be studied. On the other hand, LBE is corrosive, so it is necessary to control oxygen concentration in LBE adequately to protect structural materials from the corrosion. In order to control the oxygen concentration in LBE, it is required to develop an oxygen sensor to measure the oxygen concentration. JAEA tried to fabricate two-types of oxygen sensors (platinum type and bismuth type). As the result, it was confirmed that output voltage of the platinum type sensors was adequate in a wide temperature range.
no journal, ,
The previous presentation related to the title was carried out at the TCADS-1 in 2010 in Karlsruhe. In FY2008, Atomic Energy Commission (AEC) of Japan conducted Check and Review on Partitioning and Transmutation (P-T) technologies. The results of it were shown in the presentation. Since then the situation of the nuclear energy development policy in Japan has changed. One of the main reasons of the change was Fukushima Daiichi Nuclear Power Plant Accidents which were induced by the Great East Japan Earthquake and the following tsunami in 2011. The status of the nuclear energy development took on a different posture in Japan. This time the status of it, including the latest strategic energy plan issued by Government of Japan, and the on-going programs in Japan concerning to the P-T technologies will be presented. And the state-of-the-art not only in the development of the P-T technologies and but also in the development of ADS technologies will be also shown.