Improving Nuclear Safety of Fast Reactors by Slowing Down Fission Chain Reaction
Table 1
Dependence of reactivity gain and prompt neutron lifetime on thickness of 208Pb reflector in the fast BREST-type reactor for various models of neutron kinetics.
Two-point model
Thickness of 208Pb reflector, m
1
2
3
4
5
6
Reactivity gain caused by the reflector, $
3.01
5.30
6.51
7.21
7.58
7.78
Prompt neutron lifetime in the reflector, s
2.90 · 10−5
1.04 · 10−3
5.71 · 10−3
1.21 · 10−2
1.82 · 10−2
2.33 · 10−2
Multipoint models
The number of points
2
3
4
5
6
7
Annular layer in 208Pb reflector, m
0.5 1
1 2
2 3
3 4
4 5
5 6
Increase of the reactivity gain caused by thicker reflector, $
