Development of water-cooled blanket concept with pressure tightness against in-box LOCA for JA DEMO

Joint Special Design Team for Fusion DEMO

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


A conceptual design of breeding blanket module with pressure tightness against in-box LOCA has been carried out, based on a pressurized water-cooled solid breeder blanket. The cooling water for DEMO is operated at the PWR water conditions of 15.5 MPa and 290 ºC-325 ºC. In this design, the breeding area of the module is divided into 0.1-m-squared cells with rib structure and has simple interior for mass production using a mixed pebbles bed of Li2TiO3pebbles and Be12Ti ones. As a result, a rib with the thickness of 0.015m is needed to withstand the design pressure of 17.2 MPa by a stress analysis. The cooling system for the blanket module is designed by fluid dynamics analysis based on the PWR water conditions, and the outlet coolant temperature and the pressure drop are 321 ºC and 0.32 MPa, respectively. It was found that the self-sufficient production of tritium is likely to be satisfied with the blanket radial width thickness of 0.70 m or more and with an idea to improve TBR that the coolant is changed from existing light water to heavy water.

Original languageEnglish
Pages (from-to)894-897
Number of pages4
JournalFusion Engineering and Design
Publication statusPublished - 2019 Sept


  • Breeding blanket
  • Mixed pebbles and tritium breeding ratio
  • Pressure tightness


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