https://doi.org/10.1140/epjp/i2012-12090-2
Regular Article
Two-point theory for the differential self-interrogation Feynman-alpha method
1
Department of Nuclear Engineering, Chalmers University of Technology, SE-41296, Göteborg, Sweden
2
Centre for Energy Research, Hungarian Academy of Sciences, H-1525, Budapest, Hungary
3
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI, USA
* e-mail: anderson.johan@gmail.com
Received:
9
May
2012
Revised:
28
June
2012
Accepted:
30
July
2012
Published online:
28
August
2012
A Feynman-alpha formula has been derived in a two region domain pertaining the stochastic differential self-interrogation (DDSI) method and the differential die-away method (DDAA). Monte Carlo simulations have been used to assess the applicability of the variance to mean through determination of the physical reaction intensities of the physical processes in the two domains. More specifically, the branching processes of the neutrons in the two regions are described by the Chapman-Kolmogorov equation, including all reaction intensities for the various processes, that is used to derive a variance to mean relation for the process. The applicability of the Feynman-alpha or variance to mean formulae are assessed in DDSI and DDAA of spent fuel configurations.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2012
