On some perturbation theory singularities for reactivity effects calculations

International Conference for Young Scientists, Specialists, and Postgraduates on Nuclear Reactor Physics 2016

Abramov, B.D.^1

Leypunsky Institute for Physics and Power Engineering (IPPE), Obninsk, Russia^1

关键词: Diffusion approximations;    Fuel subassembly;    Perturbation theory;    Small perturbations;    Sub-domains;    Subdomain;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/781/1/012020/pdf
DOI  :  10.1088/1742-6596/781/1/012020

来源: IOP

【 摘 要 】

It is shown in this paper that traditional formulas for reactivity effects calculation based on diffusion approximation small-perturbation theory sometimes need updating. The corresponding specifications are provided. These are caused by the unbalance of neutron "leakages" between subdomains (zones, cells, fuel subassemblies, etc.) of the reactor as a result of perturbation. The unbalance occurs because of the jumps of relative increments of diffusion coefficients on the subdomain interfaces.