EXPERIMENTAL AND ANALYTICAL VERIFICATION OF ACCIDENT MANAGEMENT MEASURES

Two complementary test facilities - the Upper Plenum Test Facility and the ''Primarkreislauf'' test facility were constructed to investigate the thermal hydraulic response of a pressurized water reactor during postulated accidents The general objective of the the experimental pro grams is to contribute to a better understanding of accident sequences and to provide a detailed data base for the validation of computer co des, i.e. ATHLET and RELAP, the latter being used by Siemens/KWU for r eactor safety analyses A major target of the recent experimental progr ams has been the verification of accident management procedures, such as secondary and/or primary side bleed-and-feed. The experimental resu lts demonstrate that secondary side bleed-and-feed is a very effective method for removing decay hear without contaminating the containment. Primary side bleed-and-feed was also shown to be a highly effective m easure to ensure core cooling under beyond-design-basis conditions. Th is publication presents results from experiments at the Upper Plenum T est Facility and the ''Primarkreislauf'' test facility as well as from corresponding RELAP 5/Mod 2 analyses.