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sci.four-factor-formula-keff Calculator
Calculates the four-factor formula for nuclear reactor criticality: k = η × ε × p × f, where η is reproduction factor, ε is fast fission factor, p is resonance escape probability, and f is thermal utilisation. k > 1 (supercritical) → power rises; k = 1 (critical) → steady state; k < 1 → power decreases.
Inputs
Eta Neutron Yield
Reference formula or conversion factor shown for context.
F Thermal Util
Reference formula or conversion factor shown for context.
P Resonance
Reference formula or conversion factor shown for context.
Epsilon Fast Fission
A multiplier applied in the calculation.
B2 M2
Reference formula or conversion factor shown for context.
M2 M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
k∞ (infinite medium)
Sample size or count used in the calculation.
k_eff (effective multiplication)
Gratuity amount — the suggested amount to add to the bill as a service tip.
reactivity ρ
Rate of radioactive decay events per second (becquerels or curies). Decreases exponentially with time.
k∞ = η · f · p · ε
Reference formula or conversion factor shown for context.
criticality status
Current state of the system, process, or metric — typically pass/fail, healthy/warning/critical, or a descriptive classification.
leakage factor
A dimensionless multiplier applied in the calculation.