Preliminary Assessment of the Possible BWR Core/Vessel Damage States for Fukushima Daiichi Station Blackout Scenarios Using RELAP/SCDAPSIM

Table 2

Timing of initial fuel melting for scenarios with depressurization and termination of emergency water injection at 4.2, 11.8, and 19.6 hours after reactor scram (CRD flows maintained).

Depressurization and termination of water injection in RPV (hr)	Initial fuel melting {U-Zr}-O2; Time after start of  depressurization (hr)
4.2	0.8
11.8	1.5
19.6	1.9