SCTF-III test plan and recent SCTF-III test results

A test plan of the Slab Core Test Facility with Core-III (SCTF-III) has been clarified. The previous SCTF-III tests simulating PWRs with combined-injection-type ECCS indicated the following results on the thermal-hydraulics in the full-radius core: (1) two-region separation and multidimensional thermal-hydraulics both before and after reflood initiation, (2) practically no core cooling in the region far from the water downflow region before reflood initiation in spite of good core cooling in the water downflow region. (3) good core cooling even in the two-phase upflow region after bottom reflood initiation, (4) large fall-back flow rate in comparison with the prediction by a typical one-dimensional correlation. (orig.)