抄録
ALISA means a joint European-Chinese project named “Access to Large Infrastructures for Severe Accidents”. All parties can submit proposals to each other. The submitted proposal as below: In case of a core meltdown accident, molten corium relocated into the lower head of pressure vessel will be ejected into the reactor pit, if the lower head fails. Especially when invessel pressure is higher than the containment pressure, the ejected corium will be finely fragmented. Moreover, if the reactor pit is flooded with water during the vessel failure, fuel coolant interaction (FCI) may occur. The knowledge of FCI is insufficient and consequently the prediction models have large uncertainty. AP1000 use In-Vessel Retention as severe accident mitigation method. Water is injected to the channel between the RPV and insulation in the cavity. There is a quite small space in the cavity of AP1000. This proposal is to see what will happen if IVR fails. DISCO is a test facility special for FCI study in KIT that can simulate the high pressure corium eject from the reactor pressure vessel to the containment, which leads to high ejection velocity and high entry velocity into the water pool when the cavity is flooded, which is very unique for FCI investigation. Since the DISCO facility simulates also the containment, the experiment can also lead to better understanding on effects of FCI on the containment pressure and its integrity. Such experiment can be useful for FCI code validation.
