| 1 |
3/11 14:46:00 |
0 |
0.00 |
Earthquake |
| 2 |
3/11 14:47:32 |
92 |
0.03 |
Reactor scram |
| 3 |
3/11 14:48:29 |
149 |
0.03 |
MSIV closed |
| 4 |
3/11 14:52:00 |
360 |
0.10 |
IC (A) (B) automatic start-up |
| 5 |
3/11 15:03:00 |
1,020 |
0.28 |
IC (A) (B) stopped |
| 6 |
3/11 15:05:00 |
1,140 |
0.32 |
CCS torus cooling (A) in service |
| 7 |
3/11 15:10:00 |
1,440 |
0.40 |
CCS torus cooling (B) in service |
| 8 |
3/11 15:17:00 |
1,860 |
0.52 |
IC (A) restarted |
| 9 |
3/11 15:19:00 |
1,980 |
0.55 |
IC (A) stopped |
| 10 |
3/11 15:24:00 |
2,280 |
0.63 |
IC (A) restarted |
| 11 |
3/11 15:26:00 |
2,400 |
0.67 |
IC (A) stopped |
| 12 |
3/11 15:32:00 |
2,760 |
0.77 |
IC (A) restarted |
| 13 |
3/11 15:34:00 |
2,880 |
0.80 |
IC (A) stopped |
| 14 |
3/11 15:36:00 |
3,000 |
0.83 |
Tsunami hit |
| 15 |
3/11 15:37:00 |
3,060 |
0.85 |
Station blackout |
| 16 |
3/11 18:18:00 |
12,720 |
3.53 |
IC (A) valves 2A, 3A opened (steam generation confirmed) |
| 17 |
3/11 18:25:00 |
13,140 |
3.65 |
IC (A) valve 3A closed |
| 18 |
3/11 20:50:00 |
21,840 |
6.07 |
Alternative water injection lines composed of DDFP started up (stand-by for injection after reactor depressurization) |
| 19 |
3/11 21:00:00 |
22,440 |
6.23 |
Operators who entered the reactor building had their APD showing 0.8 mSv |
| 20 |
3/11 21:30:00 |
24,240 |
6.73 |
IC (A) valve 3A opened (steam generation confirmed) |
| 21 |
3/12 01:48:00 |
39,720 |
11.03 |
DDFP stopped |
| 22 |
3/12 04:00:00 |
47,640 |
13.23 |
Freshwater injected |
| 23 |
3/12 04:02:00 |
47,760 |
13.27 |
Fresh water injection by fire engines completed |
| 24 |
3/12 05:46:00 |
54,000 |
15.00 |
Freshwater injection by fire engines resumed |
| 25 |
3/12 10:40:00 |
71,650 |
19.90 |
High dose rate measured at the main gate after attempts to open the small S/C vent valve |
| 26 |
3/12 14:30:00 |
85,440 |
23.73 |
PCV pressure decrease confirmed upon AO valve operation on S/C side for PCV venting at 10:17 |
| 27 |
3/12 14:53:00 |
86,820 |
24.12 |
Freshwater injection completed |
| 28 |
3/12 15:27:00 |
88,860 |
24.68 |
PCV venting valve closed |
| 29 |
3/12 15:36:00 |
89,400 |
24.83 |
Unit-1 reactor building exploded |
| 30 |
3/12 19:04:00 |
101,880 |
28.30 |
Seawater injection started by fire engines |
| 31 |
3/12 21:45:00 |
111,540 |
30.98 |
Seawater injection stopped |
| 32 |
3/12 23:50:00 |
119,040 |
33.07 |
Seawater injection resumed |
| 33 |
3/14 01:10:00 |
210,240 |
58.40 |
Seawater injection stopped |
| 34 |
3/14 20:00:00 |
278,040 |
77.23 |
Seawater injection resumed |