The last series of the EC funded project included additional five SBLOCA experiments. VTT Energy and LTKK ran the experiments in August and September, 1997. Based on the experiences from the previous series, the following new experiments were performed in the third and final series of the EC funded programme:

GDE-41 3,5mm cold leg break close to DC, CMT position; increased driving force for CMT flow

GDE-42 3,5 cold leg break close to DC, additional IL flow orifice

GDE-43 1 mm cold leg break close to DC, long recirculation phase; disappearance of driving force for injection

GDE-44 3,5 mm cold leg break close to DC, cold CMT; PBL heating

GDE-45 3,5 mm cold leg break close to DC, PBL connected to pressurizer (Korean design of PSIS)

The objective of the GDE-43 experiment was to investigate the PSIS behaviour in a situation, when the break size is small and, consequently, CMT recirculation phase is long. If the CMT recirculation phase is long, the whole PSIS may become full of hot water before the CMT begins to inject water, and the driving force for injection disappears. This may have effects on the beginning of safety injection from the CMT. In the GDE-43 experiment, the break was located in the Loop 2 cold leg close to the downcomer, in the similar manner as in the GDE-24 and GDE-34 experiments. The break size was 1.0 mm in diameter, which is clearly smaller than in the two other simulation cases.

In the GDE-45 experiment the PBL connected the top of the pressurizer to the top of the CMT. The CMT sparger design effectively reduced condensation in the tank and no severe condensation occurred in the experiment. The CMT injection flow stagnated once, however, when the water flowing from the pressurizer disturbed the hot liquid layer in the CMT, steam condensed in the tank and CMT pressure dropped slightly. The CMT injection flow rate was oscillating. This was an outcome of the specific loop geometry of PACTEL. PACTEL has loop seals in both hot and cold legs of the primary circuit. The water accumulation to the pressurizer and the PSIS injection line resulted in an earlier core heat-up than in the similar experiments with PBL connection to the cold leg.