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REACTOR KINETICS. What is reactor kinetics? Reactor reaction on reactivity changes (whatever are the reasons of changes). Generally not possible. Principles of a Nuclear Reactor. Leakage. E. N 2. 2 MeV. N 1. Fast fission. n n/fission. Energy. Slowing down. Resonance abs.

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## REACTOR KINETICS. What is reactor kinetics?

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**REACTOR KINETICS.**What is reactor kinetics? Reactor reaction on reactivity changes (whatever are the reasons of changes) Generally not possible T11: Reactor Kinetics**Principles of a Nuclear Reactor**Leakage E N2 2 MeV N1 Fast fission n n/fission Energy Slowing down Resonance abs. ν ≈ 2.5 Non-fissile abs. Non-fuel abs. 1 eV Fission 200 MeV/fission Leakage T:Reactor Kinetics**Homogeneous infinite reactor**T:Reactor Kinetics**Kinetic Equations**T:Reactor Kinetics**Solution of Kinetic Equations**T:Reactor Kinetics**Delayed neutrons ignored**n(t)/n(0) ρ0 >0 C(t)/C(0) ρ0 <0 ρ0 Time T:Reactor Kinetics**Inhour Equation**Unit “inverse hour” = inhour 1 inhour = amount of reactivity needed to make the reactor period equal to one hour 1 pcm (per cent mille) = 10-5 of Δk/k 1$ is equal to ρ = β T:Reactor Kinetics**Special Cases**T:Reactor Kinetics**n(t)/n(0)**ρ0 = –0.5% ρ0 = –5% ρ0 = –10% T:Reactor Kinetics**The END**T:Reactor Kinetics**Graphite-moderated: lp = 10-3**Water-moderated: lp = 10-4 Fast reactors: lp = 10-7 T:Reactor Kinetics

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