Abstract
Theoretical treatments, including the methods of source-multiplication, rod-drop and source-jerk, are suggested for dealing with the spatial effects observed in several kinetic experiments for determining large negative reactivity in a reactor. An analysis by means of kinetic eigenfunctions is made on the kinetic behavior of the reactor, when these methods are applied. For each kind of experiment, a new multi-point type formula is established to replace the current single point type expressions, in order to derive the precise reactivity value by utilizing all of the neutron counting data obtained from every part of the reactor core. In the new formulas, the raw neutron counting data are integrated in reference to space and energy, weighted with the product of the static adjoint-neutron density and the static fission spectrum. This integral procedure is effective in eliminating the effects of kinetic distortion and of the spatial harmonics included in the raw counting data. In addition, using the kinetic eigenfunctions, a new formula is also presented for determining the effective intensity of the source neutrons injected in the source-neutron-introduction method for absolute measurements of reactor power.
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