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JAEA Reports

Development of mock-up test loop (IMMORTAL) for LBE spallation target

Obayashi, Hironari; Yamaki, Kenichi*; Yoshimoto, Hidemitsu*; Kita, Satoshi*; Wan, T.*; Sasa, Toshinobu

JAEA-Technology 2021-035, 66 Pages, 2022/03

JAEA-Technology-2021-035.pdf:4.26MB

Construction of Transmutation Experimental Facility (TEF) is under planning in Japan Proton Accelerator Research Complex (J-PARC) program to promote R&Ds on realization of transmutation technology by an accelerator driven system (ADS). As a facility of TEF, ADS Target Test Facility (TEF-T) will provide a spallation target to study target technology and perform post irradiation examination (PIE) of candidate materials of ADS. In ADS, lead-bismuth eutectic (LBE) alloy is used as a spallation target material and a core coolant. As is well known, LBE has corrosive to structural materials hence each component of the target system should provide compatibility with LBE. In addition, instrumentations for LBE are restricted by the target operation condition such as high temperature and irradiation environment. The devices for LBE have been developed individually to achieve the LBE target system. "Integrated Multi-functional MOckup for TEF-T Real-scale TArget Loop, IMMORTAL" was fabricated as a mock-up test loop of the target for the purpose of the integration testing of individually developed devices. This report describes an overview of IMMORTAL and the design of the installed devices.

Journal Articles

Status of LBE study and experimental plan at JAEA

Saito, Shigeru; Wan, T.*; Okubo, Nariaki; Obayashi, Hironari; Watanabe, Nao; Ohdaira, Naoya*; Kinoshita, Hidetaka; Yamaki, Kenichi*; Kita, Satoshi*; Yoshimoto, Hidemitsu*; et al.

JPS Conference Proceedings (Internet), 33, p.011041_1 - 011041_6, 2021/03

An Accelerator Driven System (ADS) for waste transmutation investigated in JAEA employs lead-bismuth eutectic (LBE) as a neutron production target material and coolant. The neutrons are to be produced via the spallation with 1.5 GeV proton beam injection. As materials irradiation data are important for ADS development, JAEA plans to construct an irradiation facility with LBE neutron production target in J-PARC. There are many technical issues on LBE for practical use. In JAEA, various R&Ds are being carried out. Concerning corrosion study, conditioning operation and functional tests of OLLOCHI started. Oxygen concentration control technology has also developing. In the large scale LBE loop experiment, the operation for steady state and transient experiments was performed by using IMMORTAL. In the area of instrument, development of ultrasonic flow meter and freeze seal valve are progressing as a key technology for the LBE loop system. Investigation of behavior of impurities in LBE, which is important for design of the irradiation facility, started. In this paper, the status of the LBE studies and experimental plan will be presented.

Journal Articles

Remote handling technology for lead-bismuth spallation target system

Obayashi, Hironari; Yoshimoto, Hidemitsu*; Kita, Satoshi*; Yamaki, Kenichi*; Wan, T.*; Saito, Shigeru; Sasa, Toshinobu

JPS Conference Proceedings (Internet), 33, p.011048_1 - 011048_6, 2021/03

Journal Articles

Steady-state and transient experiments in mock-up of J-PARC LBE spallation target system using mock-up loop "IMMORTAL"

Obayashi, Hironari; Yamaki, Kenichi; Kita, Satoshi; Yoshimoto, Hidemitsu; Wan, T.; Saito, Shigeru; Sasa, Toshinobu

Proceedings of 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-18) (USB Flash Drive), p.262 - 274, 2019/08

Construction of an experimental facility using LBE spallation target is under planning in the framework of J-PARC project to understand the compatibility of candidate ADS structural materials under flowing high temperature LBE environment with proton / neutron irradiation. We constructed a mock-up test loop, IMMORTAL to verify the feasibility of a primary cooling system in the target system. Including the layout considering remote maintainability, the same design as the actual JAEA's LBE target is reflected in most devices of IMMORTAL such as an electromagnetic pump (EMP), a heat exchanger and instrumentations. During the integrated tests, the individually developed devices of LBE loop system worked without significant malfunction. Several experimental data to verify the safety analysis model for LBE loop system using RELAP5-3D was acquired by simulation experiment of transient events such as beam over power and decrease of forced cooling.

JAEA Reports

Measurement experiment of oxygen concentration in liquid lead-bismuth eutectic; Basic Tests and estimation of gamma-ray irradiation effect

Sugawara, Takanori; Kita, Satoshi*; Yoshimoto, Hidemitsu*; Okubo, Nariaki

JAEA-Technology 2018-008, 26 Pages, 2018/09

JAEA-Technology-2018-008.pdf:10.35MB

The oxygen sensors to measure the oxygen concentration in liquid LBE (lead-bismuth eutectic) were fabricated and tested for future use in LBE-cooled ADS (accelerator-driven system) or LBE test loops. The following tests were performed; estimation of catalyst application range, freeze seal structure and estimation of gamma-ray irradiation effect. For the estimation of the catalyst application range, it was confirmed that the measurement accuracy became worse in low LBE temperature as the application range became small. For the freeze seal structure, we realized the structure to prevent the LBE leakage with 0.5 MPa pressure condition. For the estimation of gamma-ray irradiation effect, the ex-situ test was carried out and it was observed that there was little effect by 4 MGy gamma-ray irradiation.

Journal Articles

Design of 250kW LBE spallation target for the Japan Proton Accelerator Research Complex (J-PARC)

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.

Oral presentation

R&D activities on oxygen sensor and potential control for lead-bismuth eutectic

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.

Oral presentation

250 kW LBE spallation target for J-PARC Transmutation Experimental Facility

Sasa, Toshinobu; Saito, Shigeru; Obayashi, Hironari; Wan, T.; Sugawara, Takanori; Kita, Satoshi*; Yamaki, Kenichi*; Yoshimoto, Hidemitsu*

no journal, , 

JAEA proposes the Partitioning and Transmutation Technology to reduce the environmental impact caused from high-level radioactive waste using Accelerator-driven system (ADS) which adopts lead-bismuth eutectic alloy (LBE) as a coolant for subcritical core and spallation target. To realize ADS, JAEA plans to construct the Transmutation Experimental Facility (TEF) within the framework of J-PARC project. By using TEF in J-PARC, it is planned to solve technical issues for safe application of LBE by completing the data to design LBE-cooled ADS. The 250kW LBE spallation target will be located in TEF facility to prepare material irradiation database by both proton and neutron injection in the temperature range for typical LBE-cooled ADS. Detailed design and optimization of the target as a reference target of TEF-T and various elemental technologies are investigated. The large scale LBE loops for mock up the spallation target and material corrosion studies are also manufactured and ready for various experiments. The latest status of 250kW LBE spallation target design works will be described in the presentation.

Oral presentation

J-PARC LBE spallation target for ADS development

Sasa, Toshinobu; Saito, Shigeru; Obayashi, Hironari; Ariyoshi, Gen; Wan, T.*; Okubo, Nariaki; Ohdaira, Naoya*; Yamaki, Kenichi*; Kita, Satoshi*; Yoshimoto, Hidemitsu*

no journal, , 

Japan Atomic Energy Agency (JAEA) proposes to reduce the minor actinides by Partitioning and Transmutation Technology using Accelerator-driven system (ADS). To realize ADS, JAEA plans to locate Lead-Bismuth Eutectic alloy (LBE) spallation target in J-PARC. LBE spallation target will be used to solve technical issues for ADS design by preparing irradiation database. The 400 MeV - 250 kW proton beam can be used for ADS studies. The spallation target is optimized by thermal-hydraulic analysis and structural analysis to increase proton/neutron irradiation of ADS materials by sharply focused proton beam injection. The studies for elemental technologies such as a fully-remote target exchange procedure and freeze-sealed drain valve system are also performed and integrated into the design of LBE target. The latest design of the J-PARC LBE spallation target system will be presented.

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