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

Table 1

Timing of major damage progression events for a scenario with depressurization and termination of emergency water injection at 4.2 hours after reactor scram (CRD flows maintained).

Events	Time (s)	Time (hr)	Time after start of depressurization (hr)
Depressurization and termination of water injection in RPV	15000	4.2
Initial fuel melting {U-Zr}-O2	18000	5.0	0.8
Initial relocation of metallics (SS/Zr/B4C) into LP	19500	5.4	1.3
Initial relocation of fuel {U-Zr}-O2 into LP	20000	5.6	1.4