CONFIRMATION OF CANDU SHUTDOWN SYSTEM DESIGN AND PERFORMANCE DURING COMMISSIONING.

Spatially-dependent power transients during shutdown-system operation are calculated for a CANDU reactor. The computer code used is based on the Improved Quasistatic method. Various calculations of static reactivity and flux distribution are also performed. A comparison is made to results of dynamic and static tests. The agreement between simulations and experiment confirms the predicted magnitude of the major factors influencing spatial kinetics in CANDU reactors.