COMPARISON OF FINITE DIFFERENCE AND NODAL MOBY-DICK MACROCODE CALCULATIONS
23rd Symposium of AER on VVER Reactor Physics and Reactor Safety (2013, Štrbské Pleso, Slovakia)
Advances in spectral and core calculation methods
MOBY-DICK macrocode historically used finite difference fine-mesh solver to calculate pinby-pin power distribution of the VVER 440 and VVER 1000 reactors. Later a module (called
HanKa) containing nodal solver with pin-by-pin power reconstruction was added and tested.
This module was developed at the Department of Mathematics of the University of West
Bohemia. In this work results calculated using these two solvers were compared. Firstly
results from both calculation types were compared against the data acquired from the ScorpioVVER monitoring system to see how the criteria of the validation test case were satisfied.
Secondly pin-by-pin power distributions from both solvers were directly compared against
each other. It was found that both solvers satisfy the criteria of the validation test case and that
the differences between the two solvers are low enough for the nodal module HanKa with
pin-by-pin power reconstruction being considered suitable for the calculation of the neutronphysical data of the VVER 440 reactor.