Conceptual Study on Recriticality Prevention Core Having Duplex Pellets with Neutron Absorber in Outer Core in a Fast Reactor

Table 3

Results of compaction reactivity and nuclear characteristics of normal core and core having Duplex pellets with neutron absorber.

Item	Normal core without Duplex pellets	Core having Duplex pellets with neutron absorber in the outer core fuel
Compaction reactivity(%Δρ)	3.9	-1.7
Doppler reactivity; (×10^−3Δρ/(ΔT/T))	-8.9	-8.1
Void reactivity　(%Δρ)	1.6	1.7
Breeding ratio	1.17	1.21
Burnup reactivity; (%Δk/kk’/year)	2.26	2.33