28th Symposium of AER on VVER Reactor Physics and Reactor Safety (2018, Olomouc, Czechia)
Advances in spectral and core calculation methods
F. Havlůj (NRI)
UANDREA is an integrated framework for evaluation of uncertainties in neutron-physical characteristics of VVER reactors. It consists of a tool for nuclear data and material/geometry uncertainties propagation into homogenized cross-sections (using total Monte Carlo approach), wrapper for the core physics code ANDREA to run a series of calculations and finally an automated evaluation tool which computes the respective statistics along with the covariance matrices as well.
The results can be furthermore visualized in the new VIZAR tool which is shipped with the ANDREA code.
The methodology, implementation and some of the results (based on evaluation of several consecutive cycles of VVER-1000 Temelin NPP) are presented.