Static reactivity asymptotic period

This section presents [after references (j) and ( )] perturbation expressions for several definitions of reactivity, as well as the equivalent expressions required for the experimental determination of reactivities of exactly the same definition. The reactivities considered are the static reactivity (the reactivity most commonly calculated) and three special cases of Henry s time-dependent reactivity (5) the asymptotic-period reactivity, the promptmode reactivity, and the source-multiplication reactivity. 

The Inhour equation relating the asymptotic period to the static reactivity is... 

The asymptotic period and the prompt mode decay constant can be related more naturally to reactivities other than the static reactivity. The natural reactivities are related to real flux distributions in the subcritical reactor and to the importance function in the reference critical reactor. 

Inhour equation for the static reactivity [Eq. (13)] are functions of two such distributions, (f), and 4>. The asymptotic-period reactivity is, therefore, the natural reactivity to infer from the Inhour equation. 

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