[1K04-07] Fast Reactor 1

[1K05] Study on inherently safe fast spectrum reactor core to prevent recriticality during CDA

The effect of neutron absober in lower axial blanket region

*Keiko Chitose¹, Takanori Mochimaru¹, Naoyuki Takaki¹ (1. Tokyo City University)

Keywords:Fast Spectrum Reactor, Re-criticality, Core Shape, Core Disruptive Accident, Neutron absorbing material

The authors study on the geometry of inherently safe sodium-cooled fast spectrum reactor that has negative compaction reactivity during CDA. In previous presentation, the core geometry modification to enlarge molten pool area, and its effect on the compaction reactivity were introduced. This time, the neutron absorbing material is installed in the LAB region in inner-core.The negative compaction reactivity is achieved to have sub-criticality for partial-core melt.