Post-test calculation of thermal-hydraulic behaviour in Demona experiment B3 with various computer codes used in EC member states
The results of a benchmark exercise on aerosol calculation based on the Demona B3 experiment were found to be very sensitive to the calculation of energy and mass transfer between the phases. As a result it was decided to carry out a benchmark exercise for severe accident containment thermal-hydraulics codes, also based on experiment B3, which was a simulation of a late over pressure failure scenario in a PWR. The main objective was to assess the ability of the participating codes to predict atmosphere saturation levels and bulk condensation rates under conditions similar to those expected to follow a severe accident in a PWR. The paper presents the comparison of the experimental results with the following calculated quantities: total system pressure, steam pressure, containment temperature, saturation ratio, steam condensation rate on walls and in the bulk volume, water mass in sump, sump temperature, heat transfer coefficient, steam mass flow rate and structural temperature for a real time period of up to 90 hours. The paper also presents the major conclusions from the exercise in order to identify the status of present codes versus the requirements needed as input and for coupling with aerosol analysis codes.
Bibliographic Reference: EUR 12197 EN (1989) FS, 89 pp., ECU 7.50
ISBN: ISBN 92-825-9962-0;CD-NA-
Record Number: 198910930 / Last updated on: 1994-12-01
Original language: en
Available languages: en