Case study on tritium inventory in the fusion DEMO plant at JAERI

Hirofumi Nakamura, Shinji Sakurai, Satoshi Suzuki, Takumi Hayashi, Mikio Enoeda, Kenji Tobita

Research output: Contribution to journalConference articlepeer-review

50 Citations (Scopus)


Case studies on tritium inventory and permeation in a fusion demo plant designed by JAERI (DEMO(J05)) have been carried out using several data sets on the tritium transport properties of the candidate materials of the plasma facing components. The results have been compared with the design guidelines for loss of tritium into the components or coolant for tritium accountancy (1.4 kg/y) and tritium concentration in the coolant (0.37 GBq/cm3) for DEMO(J05). The results revealed that tritium concentration and inventory in the coolant attributed to permeation from the blanket (plasma facing first wall and breeding region) is expected to be much higher both of these guidelines unless designated permeation barriers are used. Therefore, permeation must be reduced by a factor of 100 in order to satisfy the guidelines. Tungsten coating on the first wall and glassy coating on the blanket cooling tubes may be good countermeasures for permeation reduction in DEMO(J05).

Original languageEnglish
Pages (from-to)1339-1345
Number of pages7
JournalFusion Engineering and Design
Issue number8-14 PART B
Publication statusPublished - 2006 Feb
Externally publishedYes
EventProceedings of the Seventh International Symposium on Fusion Nuclear Technology ISFNT-7 Part B -
Duration: 2005 May 222005 May 27


  • Fusion demo plant
  • Tritium inventory
  • Tritium permeation

ASJC Scopus subject areas

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


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