Summary on the activity of working group

G. A. Aszódi, Budapest University of Technology and Economics, Hungary

20th Symposium of AER on VVER Reactor Physics and Reactor Safety (2010, Hanasaari, Espoo, Finland)
Nuclear applications of three-dimensional thermal hydraulics

Abstract

Summary on the activity of working group G in 2010
Attila Asz?di, Coordinator of Working Group G
The AER Working G meeting was held on 31 May – 1 June 2010 in Balatonf?red, Hungary
together with Working Group C. The short summary of Working Group G presentations is the
following.
1. D. Tar (AEKI): Experimental Investigation of Coolant Mixing in VVER and PWR Reactor
Fuel Bundles by Laser Optical Techniques for CFD Validation
? PIV and LIF measurements of flow in a VVER-440 fuel assembly head at different
boundary conditions (five heating configuration)
? Test section: 1 m long rod bundle (36 heated rods, 72 kW total heat power) with
assembly head
? Presentation of some velocity and temperature fields in the assembly head
? Calculation of POD modes in 5?5 PWR rod bundle with spacer grids
2. B. Kiss, A. Asz?di (BME NTI): Benchmark Calculation with Improved VVER-440/213 RPV
CFD Model
? Detailed CFX model of VVER-440/213 reactor pressure vessels with a simplified core
? Transient calculations for starting up of the 6th main coolant pump
? Comparison between ATHLET and CFX results
? Development of hexahedral mesh for the downcomer
3. R. Szij?rt?, B. Yamaji, A. Asz?di (BME NTI): Study of Natural Convection Around a
Vertical Heated Rod Using PIV/LIF Technique
? Simultaneous measurements of velocity and temperature fields performed applying a
combined PIV and LIF setup to investigate natural convection around the vertical
heated rod.
? Local heat transfer coefficient calculated from measured data.
4. P. M?hlbauer (REZ): A Simplified Approach to VVER-440 Fuel Assembly Head
Benchmark
? Model for VVER-440 fuel assembly head without spacer grid
? Calculation of benchmark exercises with FLUENT code
? Unstructured mesh of about 14 million cells
? Presentation of calculated temperature and velocity distributions, thermocouple
signals
5. A. Shishov, O. Kudryavtsev, D. Posysaev (GIDROPRESS): VVER-440 Fuel Assembly
Head CFD benchmark ? Preliminary results
? Model for VVER-440 fuel assembly head
? Three hexahedral meshes of 10.5, 12 and 25 million cells
? Calculation of benchmark exercises with CFX code
? Presentation of calculated temperature and velocity distributions, thermocouple
signals
6. S. T?th, A. Asz?di (BME NTI): First Results of VVER-440 Fuel Assembly Head Benchmark
? Introduction of benchmark exercises
? First comparison of GIDROPRESS, REZ and VUJE results
? After discussions agreement with the participants: benchmark calculations should be
performed with and without central tube flow

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