Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Superheated Water-Cooled Small Modular Underwater Reactor Concept

  • Shirvan, Koroush (Department of Nuclear Science and Engineering, Massachusetts Institute of Technology) ;
  • Kazimi, Mujid (Department of Nuclear Science and Engineering, Massachusetts Institute of Technology)
  • Received : 2015.12.23
  • Accepted : 2016.06.08
  • Published : 2016.12.25
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Abstract

A novel fully passive small modular superheated water reactor (SWR) for underwater deployment is designed to produce 160 MWe with steam at $500^{\circ}C$ to increase the thermodynamic efficiency compared with standard light water reactors. The SWR design is based on a conceptual 400-MWe integral SWR using the internally and externally cooled annular fuel (IXAF). The coolant boils in the external channels throughout the core to approximately the same quality as a conventional boiling water reactor and then the steam, instead of exiting the reactor pressure vessel, turns around and flows downward in the central channel of some IXAF fuel rods within each assembly and then flows upward through the rest of the IXAF pins in the assembly and exits the reactor pressure vessel as superheated steam. In this study, new cladding material to withstand high temperature steam in addition to the fuel mechanical and safety behavior is investigated. The steam temperature was found to depend on the thermal and mechanical characteristics of the fuel. The SWR showed a very different transient behavior compared with a boiling water reactor. The inter-play between the inner and outer channels of the IXAF was mainly beneficial except in the case of sudden reactivity insertion transients where additional control consideration is required.

Keywords

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