| 1 |
3/11 14:46:00 |
0 |
0.00 |
Earthquake |
| 2 |
3/11 14:47:33 |
93 |
0.03 |
Reactor scram |
| 3 |
3/11 14:48:03 |
123 |
0.03 |
MSIV closed |
| 4 |
3/11 14:50:00 |
240 |
0.07 |
RCIC manually started |
| 5 |
3/11 14:51:00 |
300 |
0.08 |
RCIC automatically tripped (L-8) |
| 6 |
3/11 15:02:00 |
960 |
0.27 |
RCIC manually started |
| 7 |
3/11 15:07:00 |
1,260 |
0.35 |
S/C pool cooling by RHR |
| 8 |
3/11 15:25:00 |
2,340 |
0.65 |
S/C pool cooling by RHR terminated and S/C spray by RHR started |
| 9 |
3/11 15:28:00 |
2,520 |
0.70 |
RCIC automatically tripped (L-8) |
| 10 |
3/11 15:36:00 |
3,000 |
0.83 |
Tsunami hit |
| 11 |
3/11 15:37:00 |
3,060 |
0.85 |
S/C spray by RHR terminated |
| 12 |
3/11 15:39:00 |
3,180 |
0.88 |
RCIC manually started |
| 13 |
3/11 15:41:00 |
3,300 |
0.92 |
Station black-out |
| 14 |
3/12 03:17:00 |
45,060 |
12.52 |
CST found by the operator with low water level (30% full against 68% at the beginning of the accident) |
| 15 |
3/12 04:20:00 |
48,840 |
13.57 |
Switching water source of RCIC from CST to S/C |
| 16 |
3/14 13:25:00 |
254,340 |
70.65 |
Loss of RCIC function was judged from the decreasing reactor water level |
| 17 |
3/14 16:34:00 |
265,680 |
73.80 |
Operation to open one SRV started for reactor depressurization |
| 18 |
3/14 16:34:00 |
265,680 |
73.80 |
Working for seawater injection through fire protection line started |
| 19 |
3/14 18:00:00 |
270,840 |
75.23 |
Reactor pressure started to decrease by opening one SRV and depressurization was confirmed |
| 20 |
3/14 19:20:00 |
275,640 |
76.57 |
Fire engines were found to have halted due to depletion of fuel |
| 21 |
3/14 19:54:00 |
277,680 |
77.13 |
Restarting 1st fire engine |
| 22 |
3/14 19:57:00 |
277,860 |
77.18 |
Restarting 2nd fire engine |
| 23 |
3/14 21:20:00 |
282,840 |
78.57 |
Opening other 2 SRVs and reactor pressure decreased and reactor water level increased |
| 24 |
3/15 01:10:00 |
296,640 |
82.40 |
Opening one SRV |
| 25 |
3/15 02:22:00 |
300,960 |
83.60 |
Operation to try to open SRV started |
| 26 |
3/15 06:00:00 |
314,040 |
87.23 |
Impact sound occurred S/C pressure indicator showed 0 MPa (it has been judged that the impact sound came from Uni-4 explosion) |