RESULTS OF PRECISION CALCULATIONS OF THREE-DIMENSIONAL POWER DENSITY IN VVER-1000 CORE WITH FEEDBACKS USING MCU CODE
22nd Symposium of AER on VVER Reactor Physics and Reactor Safety (2012, Průhonice, Czech Republic)
Advances in spectral and core calculation methods
Abstract
Accounting of feedbacks on the density and temperature of the coolant, as well as the
fuel temperature is important for VVER reactors, since it has a significant influence on the
neutron-physical characteristics of such systems. As a consequence, there is a need to
incorporate feedback into precision calculations of the power density of the VVER-1000 core.
In the present work the model of the core was used, divided into 10 layers by height.
The calculations were carried out by means of Russian Monte Carlo code MCU-PD.
Individual values of densities and temperatures of the coolant, as well as the fuel temperatures
were calculated in each layer of every fuel assembly. In addition, pin-to-pin power density
was calculated in each layer.
The obtained results were compared to the results obtained by means of the certified
BIPR-7A code.
It is shown that within a reasonable computational time using currently available
hardware resources one can obtain the three-dimensional power density with an acceptable
accuracy and taking into account the feedbacks on the density and temperature of the coolant,
as well as the fuel temperature.