Calculation of VVER-1000 reactor scaling factor for inference of core barrel motion.

Highlights: [•] Scaling factors are calculated for the beginning of cycle (BOC) of VVER-1000 reactor using the direct and adjoint methods. [•] Space and energy dependent power density in core region is obtained from MCNP code. [•] Linearity assumption of relative detector response for small CBM is investigated. [•] It is shown that the direct method result is reliable for determining the CBM. [Copyright &y& Elsevier]