STGEN simulations of top blowdown tests of RD-12 steam generator.

Abstract

A computer code, called STGEN, has been developed for the purpose of analyzing the thermal hydraulic response of the steam generator to top blowdown under conditions representative of a postulated steam line break. This code was developed for best estimate predictions with a fast running capability. Recently. a series of top blowdown tests was conducted using the RD-12 steam generator connected to the RD-14 experimental test loop at the Whiteshell Nuclear Research Establishment as part of the CANDEV program. Simulations of selected tests using the STGEN code have been performed. These results are presented for key thermal hydraulic parameters. Comparisons of these parameters are made to the measurements where available. Good agreement is observed between the code prediction and the test data for the key parameters of interest. Such agreement provides confirmation of the adequacy of the model and assumptions employed in the code for the top blowdown simulations. This allows a high degree of confidence in the use of the code for accident analyses involving a break in the steam supply piping of a steam generator.