Insertion depth — 0% withdrawn (max reactivity), 100% fully in
60 %
Fuel Enrichment
U-235 enrichment — raises available excess reactivity when rods are withdrawn
3.0 %
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CRITICAL — steady state
1.000
Multiplication factor k
0
Reactivity ρ (pcm)
100.0%
Reactor power
293 °C
Core temperature
Point kinetics: dN/dt = (ρ−β)/Λ·N + Σλᵢ·Cᵢ, dCᵢ/dt = βᵢ/Λ·N − λᵢ·Cᵢ
β = 0.0065, Λ = 10⁻⁵ s, 6 delayed-neutron groups.
Each generation the neutron population is multiplied by k = 1 + ρ. k = 1 is steady critical,
k > 1 grows (supercritical), k < 1 decays (subcritical). Doppler feedback (hotter fuel
absorbs more neutrons) pulls k back toward 1 automatically.