Comparative evaluation of remote maintenance schemes for fusion DEMO reactor

Hiroyasu Utoh, Kenji Tobita, Youji Someya, Nobuyuki Asakura, Yoshiteru Sakamoto, Kazuo Hoshino, Makoto Nakamura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Maintenance schemes are one of the critical issues in DEMO design, significantly affecting the configuration of in-vessel components, the size of toroidal field (TF) coil, the arrangement of poloidal field (PF) coils, reactor building, hot cell and so forth. Therefore, the maintenance schemes should satisfy many design requirements and criteria to assure reliable and safe plant operation and to attain reasonable plant availability. The plant availability depends on reliability of remote maintenance scheme, inspection of pipe connection and plasma operation. In this paper, various remote maintenance schemes for DEMO were comparatively assessed based on requirements for DEMO remote maintenance. From the view points of the reliability of inspection on hot cell, TF coil size, stored energy of PF coil and portability of segment, the banana shape segment transport using all vertical maintenance ports would be more probable DEMO reactor maintenance scheme, and it has key engineering issues such as in-vessel transferring mechanism of segment, pipe connection and conducting shell design for plasma vertical stability.

Original languageEnglish
Pages (from-to)1648-1651
Number of pages4
JournalFusion Engineering and Design
Publication statusPublished - 2015 Oct 1
Externally publishedYes


  • DEMO
  • Fusion reactor
  • Remote maintenance
  • Sector transport
  • Segment

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering


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