[2D10-13] Analysis Method Development 2

[2D12] Implementation of SP3 method calculation capability to FRBurner module of CBZ code system

(3)Scattering component void reactivity investigation.

*Junshuang Fan¹, Go Chiba¹ (1. Hokkaido Univ.)

Keywords:SP3, perturbation theory, void reactivity, component-wise

The Simplified-P₃ perturbation (SP₃P) method for fast reactor reactivity analysis is implemented into CBZ, and its verification has been finished. Although the net reactivity given by SP₃P method is correct, difficulty on categorizing scattering component reactivity is caused by a physical meaning unknown term. Through tracing the source of this term in P₃ equations we confirmed that the general used form of SP₃ equations is not appropriate to combine with the perturbation theory for reactivity analysis. Therefore, we propose to use a straight forward form of SP₃ equations, original-SP₃ (OSP₃), to combine with perturbation theory (OSP₃P) of which each term has clear physical meaning. The verification of the OSP₃P method gives identical net reactivity result as SP₃P does. The numerical result indicates that physical meaning unknown term is scattering component reactivity.