Design fusion-plant piping and piping-system R&D, including layouts, materials, stress analysis and 3D CAD. Requires relevant plant or piping experience, ASME/JIS knowledge and intermediate English.
About this role
This role performs neutron analysis for entire fusion plants and their component equipment within the Plant Technology Division. The work evaluates shielding, heat generation, dose rates, generated nuclides and half-lives, then provides appropriate feedback to design teams. It also includes engineering work such as developing measurement equipment and conducting material irradiation experiments to expand validation data.
Daily responsibilities include selecting or developing physical models suited to each analysis target, creating or modifying CAD models for analysis, and examining appropriate boundary conditions and meshes. The engineer verifies the validity of analysis results and uses the findings to support design decisions.
Required qualifications include specialist knowledge of neutron analysis and experience using commercial or open-source neutron-analysis software such as PHITS, MCNP or OpenMC. Experience using 3D CAD tools such as Inventor or Fusion 360 is also required. The posting seeks flexibility in responding to changes in projects and the surrounding social environment, together with an interest in exploring new technologies and knowledge.
Preferred qualifications include knowledge of fast-neutron reactions, work experience in mechanical design and mechanical drafting, and coding skills using Python or similar tools. English ability sufficient for technical discussions with members from other countries is also listed as a preferred qualification.
The position is part of the simulation function supporting fusion-plant technology and may involve work for customers in Japan and overseas. The listed work locations are the Tokyo headquarters office in Ota, Tokyo, and the Kyoto Research Center in Kuse-gun, Kyoto. For Tokyo-based work, the Marunouchi satellite office may also be available from June 2026. Remote work may be discussed if the employee lives within commuting distance. Domestic and overseas transfers may be possible.
The standard schedule is 9:00 to 18:00 with a one-hour break. Flextime may apply depending on business needs. Saturdays, Sundays and public holidays are days off, with at least 120 annual holidays; the posting records 125 for 2025 and 126 for 2026. The employment is listed as full-time with no fixed contract period, although hiring as a contract employee may also be possible. Compensation is monthly-based, with annual pay listed at JPY 5.4 million to JPY 12 million and subject to consultation based on experience and changes related to company performance and individual evaluation. Benefits include social insurance, other benefits, salary increases and special paid leave granted upon joining. Indoor smoking is prohibited throughout the workplace, with a smoking room in the building. Applicants are asked not to reapply for the same position within six months of a previous application.
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