Benchmark calculation with improved VVER-440/213 RPV CFD model

B. Kiss, A. Aszodi, Budapest University of Technology and Economics, Hungary

20th Symposium of AER on VVER Reactor Physics and Reactor Safety (2010, Hanasaari, Espoo, Finland)
Reactor dynamics and safety analysis


A detailed RPV model of VVER-440/213 type reactors was developed in BME NTI in the last
years. This model contains the main structural elements as inlet and outlet nozzles, guide
baffles of hydro-accumulators, alignment drifts, perforated plates, brake- and guide tube
chamber and simplified core. For the meshing and simulations ANSYS softwares (ICEM 12.0
and CFX 12.0) were used. With the new vessel model a series of parameter studies were
performed considering turbulence models, discretisation schemes, and modeling methods. In
steady state the main results were presented on last AER Symposium in Varna. The model is
suitable for different transient calculations as well.
The purpose of the suggested new benchmark (7th Dynamic AER Benchmark 1) is to
investigate the reactor dynamic effects of coolant mixing in the VVER-440/213 reactor vessel
and to compare the different codes. The task of this benchmark is to investigate the start up of
the 6th main coolant pump. The computation was carried out with the help of ATHLET/BIPRVVER code in Kurchatov Institute 2 for this transient and was repeated with ANSYS CFX
12.0 at our Institute.

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