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Post Test Calculations of NOKO Experiments within the Framework of a European Research Program

Schaffrath, A.; Dumaz, P.


In the frame of a European program (EU BWR R&D Cluster), six
test series with an emergency condenser test bundle were
performed in 1996. Within the Physics and Thermalhydraulics
Complementary Action to the BWR Cluster (BWR/CA) the German
Forschungszentrum Rossendorf (FZR) e.V. and the French Com
missariat a l'Energie Atomique (CEA/DRN) have calculated 9
tests and an additional blind test of NOKO bundle experiments
in 1997. These post test calculations were carried out using
the ATHLET computer code (FZR) and the CATHARE2 computer code
The comparison of the experimental and computational results
(e.g. for mass flows, temperatures, capacities, pressure
drops) show an excellent agreement. Despite the good
prediction of global parameters, a variation of local
parameters (e.g. film velocity, void fraction, heat flux) can
be observed. This can be explained by the significant effect
of the tube wall conduction in controlling the heat transfer.

  • Kerntechnik Vol. 63, No. 3, Mai 1998, S. 113-119, ISSN 0932-3902


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