Simulations of Core Damage Progression for TMI-2 Severe Accident Using CINEMA Computer Code

Table 1

Detailed main events in TMI-2 severe accident.

Time (s)	Main events
0	Turbine and main feedwater pump trip
3	Pressurizer PORV valve opening
8	Reactor scram on high pressure signal
13	No pressurizer PORV valve closing
41	Operation of 1 (of 3) makeup pump 1B
122	HPI operation
278	Stop of HPI
480	Auxiliary feedwater startup
552	Core boiling begins
4,440	Shutdown B-loop RCP (end of phase 1)
6,000	Shutdown A-loop RCP
6,184	Core uncover
7,442	Cladding oxidation begins
7,719	Cladding failure
8,340	Close of the PORV line block valve
9,014	Fuel melting
10,440	Restart one B-loop RCP (end of phase 2)
11,580	Shutdown of the B-loop RCP
12,000	Start of primary system feed and bleed
13,440	Core material slumping (end of phase 3)
18,000	General emergency declared (end of phase 4)