Validation of CERBRRS Against GENTILLY-2 Station Data

Abstract

CERBRRS models the CANDU 6 reactor regulating system (RRS) in CERBERUS transient core calculations. The validation of CERBRRS described here is performed against Gentilly-2 reactor data. The present validation focuses on the liquid zone controller (LZC) modelling, specifically the LZC fill rates. Two core transient measurements were compared to CERBRRS results: a shutdown system manual trip and the 1995 adjuster bank test. The standard CERBRRS model is found to produce a slower fill rate than observed at G2 in the SDS1 trip test. A modified LZC model was developed to reproduce the SDS1 trip test results, and compared to the 1995 adjuster bank test data. The CERBRRS results compared to the measurements show good agreement of the average LZC fill level, which is a key parameter in the RRS logic. These comparisons against Gentilly-2 station data also provide additional confidence in the overall performance of the CERBRRS.