In-vessel melt retention

1. SPaYCOR: study of spry cooling of downward facing heater surface for the design
   of spray cooling for IVMR in LWRs
2. BESTH-2: Study of CHF under IVMR conditions
3. THS-15: CHF study for IVR strategy of VVER-1000
4. SAFeTY Platform: Large scale tests with prototypical corium