VALIDATION OF DYN3D PIN-POWER CALCULATION AGAINST EXPERIMENTAL RESULTS FROM THE LR-0 REACTOR
22nd Symposium of AER on VVER Reactor Physics and Reactor Safety (2012, Průhonice, Czech Republic)
NEUTRON KINETICS AND REACTOR DYNAMICS METHODS
Abstract
The EU NURISP V1000-LR0-STAT benchmark is focused on three-dimensional VVER-1000
steady-states with assembly-averaged and fine-mesh power distributions. Calculation results
are compared with measurements from the ?JV ?e? experimental reactor LR-0, which
contains shortened fuel assemblies of the VVER-1000 power reactor. The calculations are
performed with the reactor dynamic nodal code DYN3D. The usual node-averaged approach
is applied in the first step. Then, an intra-nodal pin-wise power reconstruction method and its
combination with the pin-powers from the lattice code HELIOS zero-net-current fuelassembly calculations are applied. The calculations agree quite well with experiments.
Theoretically, the power distributions calculated by pin-wise reconstruction should show
better agreement with the measurement than the node-averaged values. This is confirmed in
selected cases.