MODELING OF NPP WITH VVER-1200 BY THE COUPLED SYSTEM CODE ATHLET/BIPR-VVER USING QUASI 3D NODALISATION OF REACTOR PRESSURE VESSEL AND STEAM GENERATORS
17th Symposium of AER on VVER Reactor Physics and Reactor Safety (2007, Yalta, Crimea (Ukraine, back then))
REACTOR DYNAMICS, THERMAL HYDRAULICS AND SAFETY ANALYSIS
A detailed model of the primary and secondary loop of the new design of VVER-1200 NPP is being created for the coupled system code ATHLET/BIPR-VVER. On the basis of the previously gained experience, a very detailed 3D modeling of the reactor pressure vessel (RPV) and of the steam generators (SG) is being successfully applied. The nodalization schemas of these objects are chosen to be optimal ones concerning the fidelity to the real geometry and the needed CPU time. The thermal fluid objects (TFO) are modeled in ATHLET as objects of type ?pipe? most of them connected with cross flows, that allow to describe the mixing phenomena in RPV and in SGs near to reality. A pre-processor system supports automatically to prepare the complex and great number of nodalized volumes for the ATHLET input. A detailed modeling of the control and safety systems covers a wide spectrum of initiating events. Generic design data are used to model the 3D neutron-kinetics in BIPR, applying the modernized fuel assembly design for VVER-1200.