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Passive Safety Small Reactor for Distributed Energy Supply: Heavy Water Mixing Core

[+] Author Affiliations
Ken-Ichi Sawada, Naoteru Odano

National Maritime Research Institute, Mitaka, Tokyo, Japan

Toshihisa Ishida

Kobe University, Kobe, Japan

Paper No. ICONE14-89426, pp. 401-407; 7 pages
  • 14th International Conference on Nuclear Engineering
  • Volume 3: Structural Integrity; Nuclear Engineering Advances; Next Generation Systems; Near Term Deployment and Promotion of Nuclear Energy
  • Miami, Florida, USA, July 17–20, 2006
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4244-4 | eISBN: 0-7918-3783-1
  • Copyright © 2006 by ASME


The purpose of this paper is to study the core performance of passive safety small reactor for distributed energy supply by changing the heavy water (D2 O) concentration in the mixed coolant together with the fuel pitch. The long core life with conditions of the excessive reactivity of 2 %Δk/k, the reactivity shutdown margin of 1 %Δk/k and the negative coolant temperature reactivity coefficient is attained for the case of D2 O concentration of 60 % with 10 % enrichment gadolinia (Gd2 O3 ) doped fuel rods. This D2 O core has a shorter core life 4.14 years than the original light water (H2 O) core 4.76 years, while it needs a larger core size. However, changing the D2 O concentration on the way during the burn-up shows a possibility of extending more the core life than that of the original H2 O core.

Copyright © 2006 by ASME



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