Title: Validation of ASTEC v2.0 corium jet fragmentation model using FARO experiments
Citation: NUCLEAR ENGINEERING AND DESIGN vol. 286 p. 246-252
Publication Year: 2015
JRC N°: JRC89761
ISSN: 0029-5493
URI: http://www.sciencedirect.com/science/article/pii/S0029549315000989
DOI: 10.1016/j.nucengdes.2015.02.016
Type: Articles in periodicals and books
Abstract: ASTEC is an integral code for the prediction of Severe Accidents in Nuclear Power Plants. As such, it needs to cover all physical processes that could occur during accident progression, yet keeping its models simple enough for the ensemble to stay manageable and produce results within an acceptable time. The present paper is concerned with the validation of the Corium jet fragmentation model of ASTEC v2.0 rev3 by means of a selection of six experiments carried out within the FARO facility. The different conditions applied within these six experiments help to analyse the model behaviour in different situations and to expose model limits. In addition to comparing model outputs with experimental measurements, sensitivity analyses are applied to investigate the model. Results of the paper are (i) validation runs, accompanied by an identification of situations where the implemented fragmentation model does not match the experiments well, and discussion of results; (ii) its special attention to the models calculating the diameter of fragmented particles, the identification of a fault in one model implemented, and the discussion of simplification and ad hoc modification to improve the model fit; and, (iii) an investigation of the sensitivity of predictions towards inputs and parameters. In this way, the paper offers a thorough investigation of the merit and limitation of the fragmentation model used in ASTEC.
JRC Directorate:Energy, Transport and Climate

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