An Analysis of Criticality Achievement Process

J.Bajgl, M.Bárta

29th Symposium of AER on VVER Reactor Physics and Reactor Safety (2019, Energoland, Mochovce NPP, Slovakia)
fuel management issues


The implementation of the Low Leakage Loading Pattern (L3P) in Dukovany NPP (VVER-440) led to high differences between expected undercriticality during criticality achievement process and measured one. There was formulated a new approach to the undercriticality inspection during criticality achievement process in previous paper in 2014. This method has been used during start-up in Dukovany NPP since 2012.
Non-uniform distributions of spontaneous fission sources in different loading patterns are described in this paper. There is presented and discussed a new correction function formulation used during the criticality achievement process assessment.

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