THE CONTRIBUTION OF UPTF EXPERIMENTS TO RESOLVE SOME SCALE-UP UNCERTAINTIES IN COUNTERCURRENT 2-PHASE FLOW

GLAESER H KARWAT H

H. Glaeser et H. Karwat, THE CONTRIBUTION OF UPTF EXPERIMENTS TO RESOLVE SOME SCALE-UP UNCERTAINTIES IN COUNTERCURRENT 2-PHASE FLOW, Nuclear Engineering and Design, 145(1-2), 1993, pp. 63-84

20

INGLESE

Article

Nuclear Sciences & Tecnology

Nuclear Engineering and Design → ACNP

0029-5493

145

1-2

1993

63 - 84

ISI

0029-5493(1993)145:1-2<63:TCOUET>2.0.ZU;2-D

The volume scaling of previous existing integral test facilities is up to a maximum of 1/48 of the full size power reactors (or 1/25 for the reflood integral test facility CCTF). The experimental results achiev ed in these facilities or in down-scaled separate effects test facilit ies have to be extrapolated to reactor scale in order to evaluate the full size reactor thermal hydraulic behaviour. There is some uncertain ty in extrapolating the small scale results. Experimental results from the 1:1 scale UPTF test facility can considerably reduce the uncertai nty of geometrical scaling. The final goal is to qualify the overall v alidity of computer program simulation, and to quantify the uncertaint y of the computer program calculations for full size reactors. Signifi cant scaling dependent experimental results have been found in UPTF se parate effects tests in the case of heterogeneous steam-water flow con ditions. This is especially the case for vertical and horizontal count ercurrent flows.