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# REACTOR KINETICS. What is reactor kinetics?

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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1. REACTOR KINETICS. What is reactor kinetics? Reactor reaction on reactivity changes (whatever are the reasons of changes) Generally not possible T11: Reactor Kinetics

2. 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

3. Homogeneous infinite reactor T:Reactor Kinetics

4. T:Reactor Kinetics

5. Kinetic Equations T:Reactor Kinetics

6. Solution of Kinetic Equations T:Reactor Kinetics

7. Delayed neutrons ignored n(t)/n(0) ρ0 >0 C(t)/C(0) ρ0 <0 ρ0 Time T:Reactor Kinetics

8. 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

9. T:Reactor Kinetics

10. Special Cases T:Reactor Kinetics

11. T:Reactor Kinetics

12. T:Reactor Kinetics

13. n(t)/n(0) ρ0 = –0.5% ρ0 = –5% ρ0 = –10% T:Reactor Kinetics

14. The END T:Reactor Kinetics

15. T:Reactor Kinetics

16. T:Reactor Kinetics

17. T:Reactor Kinetics

18. Graphite-moderated: lp = 10-3 Water-moderated: lp = 10-4 Fast reactors: lp = 10-7 T:Reactor Kinetics

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