Study of safety features and accident scenarios in a fusion DEMO reactor

M. Nakamura, K. Tobita, W. Gulden, K. Watanabe, Y. Someya, H. Tanigawa, Y. Sakamoto, T. Araki, H. Matsumiya, K. Ishii, H. Utoh, H. Takase, T. Hayashi, A. Satou, T. Yonomoto, G. Federici, K. Okano

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


After the Fukushima Dai-ichi nuclear accident, a need for assuring safety of fusion energy has grown in the Japanese (JA) fusion research community. DEMO safety research has been launched as a part of Broader Approach DEMO Design Activities (BA-DDA). This paper reports progress in the fusion DEMO safety research conducted under BA-DDA. Safety requirements and evaluation guidelines have been, first of all, established based on those established in the Japanese ITER site invitation activities. The radioactive source terms and energies that can mobilize such source terms have been assessed for a reference DEMO concept. This concept employs in-vessel components that are cooled by pressurized water and built of a low activation ferritic steel (F82H), contains solid pebble beds made of lithium-titanate (Li2TiO3) and beryllium-titanium (Be12Ti) for tritium breeding and neutron multiplication, respectively. It is shown that unlike the energies expected in ITER, the enthalpy in the first wall/blanket cooling loops is large compared to the other energies expected in the reference DEMO concept. Reference accident event sequences in the reference DEMO in this study have been analyzed based on the Master Logic Diagram and Functional Failure Mode and Effect Analysis techniques. Accident events of particular concern in the DEMO have been selected based on the event sequence analysis and the hazard assessment.

Original languageEnglish
Pages (from-to)2028-2032
Number of pages5
JournalFusion Engineering and Design
Issue number9-10
Publication statusPublished - 2014 Oct
Externally publishedYes


  • Accident scenario analysis
  • DEMO
  • Safety
  • Source term analysis

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • General Materials Science
  • Mechanical Engineering


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