To Main Page..

Reactor no.1 Reactor no.2 Reactor no.3 Reactor no.4
The observations from the Tepco webcam (cached since 5am March 11th)
Sprayings to the spent fuel pools * Anti-dust sprayings * Fukushima Images

Fukushima reactor no.1 monitoring pressure/temperature data 
For more recent data from Tepco, go here
Time                    RP(A)   RP(B)   D/W       S/C      FNT    BHT    WL(A)  WL(B)  DW R/H        Ref
                        MPa abs MPa abs MPa abs   MPa abs  gr.C   gr.C   meter  meter  gr.C 

11:00, May   16th       0.586   1.451   0.117     0.100     94.6   83.1   DS    -1.75   83.5/80.5  Tepco
05:00, May   16th       0.586   1.451   0.118     0.100     95.1   83.9   DS    -1.70   84.6/81.1  Tepco
11:00, May   15th       0.586   1.436   0.122     0.100    110.4   88.6   DS    -1.70   89.1/84.1  Tepco
05:00, May   15th       0.589   1.431   0.122     0.100    110.2   88.8   DS    -1.70   89.1/84.0  Tepco
11:00, May   14th       0.584   1.406   0.121     0.100    111.0   90.0   DS    -1.70   90.2/84.7  Tepco
05:00, May   14th       0.581   1.411   0.121     0.100    114.5   90.2   DS    -1.70   89.9/85.0  Tepco
11:00, May   13th       0.579   1.399   0.120     0.100    114.2   91.0   DS    -1.70   90.9/85.5  Tepco
05:00, May   13th       0.586   1.396   0.120     0.100    114.3   91.3   DS    -1.70   91.2/85.8  Tepco
11:00, May   12th       0.566   1.401   0.121     0.100    114.9   92.5   DS    -1.65   92.7/87.0  Tepco
05:00, May   12th       0.564   1.394   0.120     0.100    114.7   92.7   DS    -1.65   93.0/87.3  Tepco
11:00, May   11th       0.561   1.379   0.110     0.100    114.1   93.2   DS    -1.50   93.3/88.0  Tepco
05:00, May   11th       0.564   1.381   0.120     0.105    114.9   93.7   DS    -1.70   93.8/88.6  Tepco
11:00, May   10th       0.564   1.374   0.120     0.105    114.7   94.5   DS    -1.65   94.6/89.2  Tepco
05:00, May   10th       0.559   1.376   0.115     0.105    115.7   94.7  -1.65  -1.65   94.7/89.4  Tepco
11:00, May    9th       0.566   1.389   0.120     0.105    116.6   95.3  -1.65  -1.65   95.4/89.8  Tepco
05:00, May    9th       0.561   1.401   0.120     0.105    115.8   95.4  -1.65  -1.70   95.5/89.9  Tepco
05:00, May    8th       0.561   1.391   0.120     0.110    119.8   96.9  -1.65  -1.70   97.0/91.0  Tepco
11:00, May    7th       0.564   1.391   0.125     0.115    124.7   98.7  -1.70  -1.65   98.6/92.1  Tepco
05:00, May    7th       0.566   1.404   0.125     0.115    124.8   99.4  -1.70  -1.70   99.4/92.6  Tepco
11:00, May    6th       0.566   1.386   0.130     0.120    134.1  102.6  -1.65  -1.70  102.9/94.7  Tepco
05:00, May    6th       0.564   1.396   0.130     0.120    134.7  102.8  -1.70  -1.70  103.1/94.9  Tepco
11:00, May    5th       0.561   1.384   0.130     0.130    134.7  101.5  -1.65  -1.50  102.4/92.2  Tepco
05:00, May    5th       0.551   1.379   0.130     0.130    135.2  102.0  -1.60  -1.60  102.6/92.3  Tepco
11:00, May    4th       0.551   1.366   0.135     0.135    137.5  103.2  -1.70  -1.70  104.1/92.7  Tepco
05:00, May    4th       0.561   1.369   0.135     0.135    138.4  103.6  -1.70  -1.70  104.3/92.8  METI125
11:00, May    3rd       0.556   1.359   0.135     0.135    141.9  105.7  -1.70  -1.70  106.5/95.0  METI124
05:00, May    3rd       0.554   1.354   0.135     0.135    142.1  105.7  -1.70  -1.70  106.5/94.8  Tepco
11:00, May    2nd       0.549   1.346   0.135     0.135    142.2  105.8  -1.65  -1.70  106.5/94.8  Tepco
05:00, May    2nd       0.554   1.341   0.135     0.135    142.3  105.7  -1.65  -1.70  106.4/94.8  METI123
11:00, May    1st       0.541   1.326   0.130     0.130    142.0  105.2  -1.65  -1.70  105.8/94.3  METI122
05:00, May    1st       0.546   1.331   0.130     0.130    141.3  104.7  -1.65  -1.65  105.2/94.0  Tepco
05:00, April 30th       0.546   1.306   0.120     0.115    131.2  101.6  -1.65  -1.70  102.2/91.4  METI121
11:00, April 29th       0.511   1.276   0.105     0.105    114.7   95.0  -1.70  -1.70   95.2/87.0  METI120
10:14, April 29th       Water injection returned to 6 m3/h, after testing of increased rates since 10:02, April 27th
09:00, April 29th       Water injection rate currently at 10 m3/h
05:00, April 28th       0.516   1.269   0.125     0.125    107.3   98.5  -1.65  -1.60  100.5/88.3  METI118
10:02, April 27th       Start test of increased injection rates (up to 14 m3/h) to determine rate needed to flood CV
05:00, April 27th       0.551   1.306   0.150     0.155    132.0  110.5  -1.65  -1.60  112.6/97.2  METI116
05:00, April 26th       0.546   1.286   0.150     0.150    134.7  110.9  -1.65  -1.65  113.4/96.9  METI115
23:00, April 25th       0.551   1.274   0.150     0.150    133.3  111.3  -1.65  -1.65  113.7/97.0  METI114
06:00, April 25th       0.551   1.274   0.155     0.155    137.7  111.4  -1.70  -1.65  114.0/96.6  METI113
00:00, April 25th       0.541   1.261   0.155     0.155    137.7  111.3  -1.70  -1.70  114.0/96.5  METI112
12:00, April 24th       0.534   1.244   0.155     0.155    133.5  110.8  -1.70  -1.70  114.0/96.3  METI111
12:00, April 23rd       0.541   1.231   0.160     0.160    142.3  112.4  -1.70  -1.70  METI110
00:00, April 23rd       0.541   1.229   0.160     0.160    135.3  112.7  -1.65  -1.65  METI109
12:00, April 22nd       0.541   1.221   0.160     0.160    136.5  112.8  -1.65  -1.65  METI108
06:00, April 22nd       0.536   1.214   0.160     0.160    137.4  113.0  -1.65  -1.65  METI107
12:00, April 21st       0.534   1.211   0.160     0.160    153.3  113.6  -1.65  -1.65  METI106
06:00, April 21st       0.526   1.204   0.160     0.160    153.4  113.5  -1.70  -1.65  METI105
12:00, April 20th       0.521   1.179   0.160     0.160    154.1  113.3  -1.70  -1.70  METI104
00:00, April 20th       0.524   1.171   0.165     0.165    164.1  113.9  -1.60  -1.65  METI103
12:00, April 19th       0.531   1.149   0.165     0.170    167.8  114.9  -1.60  -1.65  METI102
06:00, April 19th       0.524   1.141   0.170     0.170    169.0  115.1  -1.60  -1.65  METI101
13:00, April 18th       0.529   1.136   0.170     0.170    170.2  115.2  -1.65  -1.65  METI100
06:00, April 18th       0.524   1.131   0.170     0.170    173.9  115.4  -1.65  -1.65  METI99
12:00, April 17th       0.521   1.074   0.175     0.170    180.4  116.6  -1.65  -1.65  METI98
12:00, April 16th       0.524   1.076   0.185     0.175    189.9  118.1  -1.65  -1.65  METI97 WL time 14.:00
06:00, April 16th       0.523   1.079   0.190     0.170    189.9  118.3  -1.65  -1.65  METI96
12:00, April 15th       0.530   1.064   0.190     0.170    195.4  119.9  -1.65  -1.65  METI95
03:00, April 15th       0.529   1.054   0.185     0.165    197.0  119.4  -1.55  -1.55  METI94
06:00, April 14th       0.521   1.041   0.190     0.165    201.8  119.2  -1.60  -1.60  METI93
00:00, April 14th       0.524   1.041   0.190     0.165    203.6  119.5  -1.60  -1.60  METI92
12:00, April 13th       0.520   1.034   0.190     0.165    204.5  118.9  -1.60  -1.65  METI91
06:00, April 13th       0.524   1.029   0.190     0.165    206.2  119.0  -1.65  -1.65  METI90
06:00, April 12th       0.517   1.009   0.190     0.165    220.8  119.9  -1.65  -1.65  METI88
18:11, April 11th       --injection of water to core resumed--- -----------------------------
17:56, April 11th       --injection of water to core is stopped -----------------------------
17:16, April 11th       --M7.1 earthquake, epicenter 80 km south of Fukushima, tsunami warning 
12:00, April 11th       0.517   0.974   0.195     0.165    216.2  119.0  -1.65  -1.65  METI87
06:00, April 11th       0.511   0.974   0.195     0.165    222.9   N/A   -1.65  -1.65  J80
02:00, April 11th       0.514   0.974   0.195     0.165    222.8  120.2  -1.65  -1.65  METI86 Time for RP is 00:00
10:00, April 10th       0.514   0.959   0.195     0.160    227.1  120.4  -1.60  -1.70  METI85
06:00, April 10th       0.511   0.949   0.195     0.165    227.7  120.6  -1.65  -1.65  METI84
12:00, April 09th       0.510   0.924   0.190     0.160    235.2  120.1  -1.65  -1.65  METI83
00:00, April 09th       0.496   0.904   0.190     0.155    240.5  119.7  -1.65  -1.65  METI82
12:00, April 08th       0.496   0.894   0.185     0.155    246.6  119.4  -1.65  -1.65  METI81
00:00, April 08th       0.491   0.889   0.180     0.150    260.7  118.6  -1.65  -1.65  METI80
12:00, April 07th       0.476   0.859   0.165     0.150    223.8  116.9  -1.65  -1.65  METI79
06:00, April 07th       0.464   0.859   0.155     0.155    216.3  116.2  -1.65  -1.65  METI78
01:31, April 07th       -start injection of nitrogen gas into the drywell--------------------
22:30, April 06th       -valve opening operation as preparation of injection of nitrogen gas- 
12:00, April 06th       0.414   0.754   0.150     0.150    214.0  115.0  -1.65  -1.65  METI77
00:00, April 06th       0.405   0.733   0.150     0.150    221.6  114.8  -1.65  -1.65  METI76
06:00, April 05th       0.409   0.720   0.150     N/A      233.5  114.8  -1.70  -1.65  METI74
11:00, April 04th       0.399   0.704   0.150     0.150    242.8  115.3  -1.65  -1.65  METI73
00:00, April 04th       0.405   0.693   0.155     0.155    243.1  115.8  -1.65  -1.65  METI72
09:00, April 03rd       0.394   0.648   0.155     0.155    252.8  116.7  -1.65  -1.65  METI71
03:00, April 03rd       0.391   0.643   0.155     0.160    256.7  117.2  -1.65  -1.65  METI70
12:00, April 02nd       0.391   0.632   0.155     0.155    259.4  117.6  -1.65  -1.65  METI69
04:00, April 02nd       0.389   0.621   0.160     0.160    261.5  118.0  -1.60  -1.60  METI68
10:00, April 01st       0.396   0.598   0.165     0.165    248.6  118.5  -1.65  -1.65  METI67
06:00, April 01st       0.394   0.596   0.170     0.170    255.2  119.7  -1.60  -1.60  N66
00:00, April 01st       0.394   0.583   0.175     N/A      256.2  N/A    -1.65  -1.65  J53
12:00, March 31st       0.430   0.609   0.210     0.205    246.1  126.1  -1.60  -1.65  N65
08:00, March 31st       0.430   0.609   0.210     0.205    249.4  N/A    -1.65  -1.65  J52
04:00, March 31st       0.434   0.612   0.210     0.210    251.2  128.0  -1.65  -1.65  J50/METI
13:00, March 30th       0.441   0.592   0.230     0.230    270.1  130.2  -1.60  -1.60  J49
04:00, March 30th       0.454   0.589   0.235     0.235    281.2  133.9  -1.60  -1.60  N62
22:00, March 29th       0.454   0.583   0.245     N/A      290.5  N/A    -1.65  -1.65  J47
13:00, March 29th       0.472   0.592   0.265     0.265    299.4  135.8  -1.65  -1.60  N61
12:00, March 29th       0.484   0.592   0.275     0.275    309.6  137.6  -1.65  -1.65  N61
09:40, March 29th       0.484   0.592   0.275     0.275    N/A    N/A    -1.65  -1.65  N61
06:00, March 29th       0.493   0.603   0.285     0.285    323,3  139.4  -1.60  -1.60  N60
04:00, March 29th       0.493   0.603   0.285     0.285    323,3  139.4  -1.60  -1.60  N60
01:00, March 29th       0.495   0.601   0.290     N/A      N/A    N/A    -1.50  -1.65
12:30, March 28th       0.477   0.533   0.270     0.270    304.5  139.3  -1.70  -1.65  N59
03:00, March 28th       0.477   0.544   0.270     0.270    N/A    N/A    -1.70  -1.65  N58
09:00, March 27th       0.475   0.517   0.270     0.270    224.8  143.4  -1.65  -1.60  N57
05:00, March 27th       0.472   0.508   0.270     0.270    212.8  141.7  -1.65  -1.60  N56
13:00, March 26th       0.452   0.481   0.275     0.275    212.3  146.9  -1.65  -1.60  N55
09:30, March 26th       0.477   0.461   0.270     0.270    195.3  146.3  -1.65  -1.60  N54
05:00, March 26th       0.454   0.461   0.270     0.270    209.4  144.3  -1.65  -1.60  N53
16:30, March 25th       0.443   0.443   0.275     0.275    196.9  148.5  -1.65  -1.60  N52
15:37, March 25th       - start injection of fresh-water to the core ---------------------
10:00, March 25th       0.450   0.450   0.295     0.290    197.8  153.6  -1.65  -1.65  N51
06:00, March 25th       0.466   0.452   0.310     0.305    204.5  157.5  -1.70  -1.65  N50
17:00, March 24th       0.540   0.468   0.355     0.355    217.9  172.4  -1.65  -1.65  N49
11:00, March 24th       0.533   0.502   0.400     0.395    175.3  182.8  -1.70  -1.70  N48
01:00, March 24th       0.511   0.488   0.385     0.370    243    229    -1.70  -1.70  N47
16:00, March 23rd       0.481   0.459   0.360     0.330    305    306    -1.75  -1.70  N46
12:00, March 23rd       0.457   0.420   0.320     0.300    345    350    -1.75  -1.75  N45
06:00, March 23rd       N/A     N/A     N/A       N/A      400    400                  OT
04:00, March 23rd       0.403   0.391   0.260     0.240    >400   >400   -1.75  -1.75  N44
17:00, March 22nd       N/A     N/A     N/A       N/A      386    394                  OT
15:30, March 22nd       0.317   0.270   0.175     0.160    386    394    -1.80  -1.75  N43
11:20, March 22nd       0.328   0.306   0.175     0.155    383    394    -1.80  -1.75  N42/PC
06:00, March 22nd       0.297   0.268   0.160     0.155    380    388    -1.75  -1.70  N41/PC
05:00, March 22nd       N/A     N/A     N/A       N/A      383    391     N/A    N/A   PC
00:15, March 22nd       N/A     N/A     N/A       N/A      381    387     N/A    N/A   PC
14:25, March 21st       0.299   0.272   0.160     0.155    380    390    -1.75  -1.75  N40/OT
14:00, March 21st       N/A     N/A     N/A       N/A      380    390     N/A    N/A   PC
13:30, March 21st       N/A     N/A     N/A       N/A      380    390     N/A    N/A   PC
08:00, March 21st       0.297   0.265   0.160     0.160    370    390    -1.75  -1.75  N39/PC
05:00, March 21st       0.295   0.259   0.160     0.160    N/A    N/A                  N38
03:00, March 21st       N/A     N/A     N/A       N/A      370    381     N/A    N/A   PC
22:00, March 20th       N/A     N/A     N/A       N/A      370    388                  PC
15:00, March 20th       0.288   0.259   0.170     0.160    N/A    N/A                  N37
13:00, March 20th       N/A     N/A     N/A       N/A      394    400                  OT
11:00, March 20th       0.295   0.261   0.170     0.160    N/A    N/A                  N36  
05:00, March 20th       0.304   0.263   0.180     0.170    393    396.6                N35/PC
03:30, March 20th       N/A     N/A     N/A       N/A      393    397                  OT
16:50, March 19th       0.306   0.261   0.180     0.170    N/A    N/A                  N34
11:00, March 19th       0.297   0.252   0.170     0.170    N/A    N/A                  N33  
03:30, March 19th       0.306   0.256   0.180     0.165    N/A    N/A     -1.80  -1.70 N32
21:10, March 18th       0.295   0.252   0.180     0.160    N/A    N/A                  N31   
07:55, March 18th       0.270   0.247   N/A       N/A      N/A    N/A     -1.70  dscal N30 
02:50, March 18th       0.265   0.243   N/A       N/A      N/A    N/A                  N29
11:30, March 17th       0.274   0.245   N/A       N/A      N/A    N/A             -1.80 N28
03:10, March 17th       0.299   0.252   N/A       N/A      N/A    N/A      -1.80  -1.75 N27
00:07, March 17th       N/A     0.315   N/A       N/A      N/A    N/A       N/A   -1.80 OTH
14:30, March 16th       N/A     0.308   N/A       N/A      N/A    N/A       N/A   -1.75  OT
12:25, March 16th       0.308   0.272   N/A       N/A      N/A    N/A      -1.75  -1.75  N26
10:00, March 16th       N/A     0.268   N/A       N/A      N/A    N/A       N/A   -1.75  OT
09:20, March 16th       N/A     0.268   N/A       N/A      N/A    N/A       N/A   -1.75  OT
07:00, March 16th       N/A     0.268   N/A       N/A      N/A    N/A       N/A   -1.75  OT
06:55, March 16th       0.28    N/A     N/A       N/A      N/A    N/A      -1.8    N/A   FEPC
06:00, March 16th       N/A     0.263   N/A       N/A      N/A    N/A       N/A   -1.75  OT
04:00, March 16th       N/A     0.259   N/A       N/A      N/A    N/A       N/A   -1.75  OT
01:35, March 16th       N/A     0.270   N/A       N/A      N/A    N/A       N/A   -1.75  OT
18:43, March 15th       0.270   0.267   N/A       N/A      N/A    N/A      -1.80  -1.80  N25
11:42, March 15th       0.274   0.286   0.315     N/A      N/A    N/A      -1.70  -1.70  N24
04:00, March 15th       N/A     0.317   N/A       N/A      N/A    N/A       N/A   -1.75  OT
03:00, March 15th       N/A     0.324   N/A       N/A      N/A    N/A       N/A   -1.70  OT
22:40, March 14th       N/A     0.341   N/A       N/A      N/A    N/A       N/A   -1.70  OT
19:30, March 14th       0.249   0.371   N/A       N/A      N/A    N/A      dscale dscale N23
16:00, March 14th       N/A     0.371   N/A       N/A      N/A    N/A       N/A   -1.75  OT
15:00, March 14th       N/A     0.369   N/A       N/A      N/A    N/A       N/A   -1.80  OT
14:00, March 14th       N/A     0.377   N/A       N/A      N/A    N/A       N/A   -1.80  OT
13:00, March 14th       N/A     0.376   dscale    N/A      N/A    N/A       N/A   -1.80  OT
12:00, March 14th       N/A     0.376   0.480     0.485    N/A    N/A       N/A   -1.80  OT
11:30, March 14th       N/A     0.376   0.440     0.435    N/A    N/A       N/A   -1.80  OT
09:00, March 14th       N/A     0.376   0.450     0.445    N/A    N/A       N/A   -1.75  OT
08:00, March 14th       N/A     0.385   0.460     0.455    N/A    N/A       N/A   -1.75  OT
07:00, March 14th       N/A     0.389   0.475     0.470    N/A    N/A       N/A   -1.75  OT
06:00, March 14th       N/A     0.394   0.485     0.480    N/A    N/A       N/A   -1.70  OT
05:00, March 14th       N/A     0.400   0.490     0.485    N/A    N/A       N/A   -1.70  OT
04:00, March 14th       N/A     0.405   0.495     0.490    N/A    N/A       N/A   -1.70  OT
03:00, March 14th       N/A     0.409   0.505     0.500    N/A    N/A       N/A   -1.70  OT
03:00, March 14th       N/A     0.416   0.510     0.505    N/A    N/A       N/A   -1.70  OT
00:30, March 14th       N/A     0.425   0.530     0.530    N/A    N/A       N/A   -1.75  OT
23:30, March 13th       N/A     0.425   0.530     0.530    N/A    N/A       N/A   -1.75  OT
23:00, March 13th       N/A     0.434   0.540     0.530    N/A    N/A       N/A   -1.75  OT
22:20, March 13th       N/A     0.434   0.540     0.540    N/A    N/A       N/A   -1.75  OT
22:05, March 13th       N/A     0.443   0.540     0.540    N/A    N/A       N/A   -1.75  OT
21:40, March 13th       N/A     0.443   0.550     0.550    N/A    N/A       N/A   -1.75  OT
20:45, March 13th       N/A     0.443   0.560     0.560    N/A    N/A       N/A   -1.75  OT
19:55, March 13th       N/A     0.454   0.575     0.570    N/A    N/A       N/A   -1.70  OT
19:30, March 13th       N/A     0.459   0.580     0.580    N/A    N/A       N/A   -1.70  OT
18:45, March 13th       N/A     0.463   0.590     0.585    N/A    N/A       N/A   -1.70  OT
17:30, March 13th       N/A     0.472   0.600     0.600    N/A    N/A       N/A   -1.70  OT
17:00, March 13th       N/A     0.479   0.606     0.600    N/A    N/A       N/A   -1.70  OT
16:45, March 13th       N/A     0.479   0.605     N/A      N/A    N/A       N/A   -1.70  OT
16:15, March 13th       N/A     0.479   0.605     0.600    N/A    N/A       N/A   -1.70  OT
15:00, March 13th       N/A     0.474   0.600     0.600    N/A    N/A       N/A   -1.70  OT
14:10, March 13th       N/A     0.472   N/A       N/A      N/A    N/A       N/A   -1.70  OT
13:00, March 13th       N/A     0.468   N/A       N/A      N/A    N/A       N/A   -1.70  OT
12:40, March 13th       N/A     0.466   N/A       N/A      N/A    N/A       N/A   -1.70  OT
11:55, March 13th       N/A     0.466   N/A       N/A      N/A    N/A       N/A   -1.70  OT
11:25, March 13th       N/A     0.465   N/A       N/A      N/A    N/A       N/A   -1.70  OT
10:55, March 13th       N/A     0.459   N/A       N/A      N/A    N/A       N/A   -1.70  OT|
10:35, March 13th       N/A     0.483   N/A       N/A      N/A    N/A       N/A   -1.70  OT
09:55, March 13th       N/A     0.454   N/A       N/A      N/A    N/A       N/A   -1.70  OT
09:25, March 13th       N/A     0.454   N/A       N/A      N/A    N/A       N/A   -1.70  OT
09:10, March 13th       N/A     0.459   N/A       N/A      N/A    N/A       N/A   -1.70  OT
08:20, March 13th       N/A     0.459   N/A       N/A      N/A    N/A       N/A   -1.70  OT
08:00, March 13th       N/A     0.454   N/A       N/A      N/A    N/A       N/A   -1.70  OT
06:00, March 13th       N/A     0.62    N/A       N/A      N/A    N/A       N/A   -1.70  CNIC
02:00, March 13th       N/A     0.63    0.58      N/A      N/A    N/A       N/A   -1.70  CNIC
01:00, March 13th       N/A     0.64    N/A       N/A      N/A    N/A       N/A   -1.70  CNIC
23:00, March 12th       -sea water injection temporarily stopped due to new tsunami risk-----
22:15, March 12th       -------strong afterquake---------------------------------------------
20:10, March 12th       -starts sea water injection to core and then boric acid subsequently-
19:11, March 12th       ---- radiation risk, government has ordered a 20 km evacuation zone -
18:30, March 12th       N/A     N/A     0.67      N/A      N/A    N/A       N/A   -1.65  CNIC
15:36, March 12th       -hydrogen explosion tears off roof floor panels and roof collapses--- 
15:29, March 12th       -------------------- radiation at site boundary exceeds limits-------
15:20, March 12th       N/A     N/A     0.70      N/A      N/A    N/A       N/A   -1.65  CNIC
15:00, March 12th       - webcam shows vent from exhaust stack unit 1/2,steam going inland --
14:41, March 12th       N/A     N/A     0.77      N/A      N/A    N/A       N/A   -1.55  CNIC
13:38, March 12th       N/A     N/A     0.77      N/A      N/A    N/A       N/A   -1.40  CNIC
12:05, March 12th       N/A     N/A     0.77      N/A      N/A    N/A       N/A   -0.80  CNIC
11:20, March 12th       N/A     N/A     N/A       N/A      N/A    N/A       N/A    0.70  CNIC
11:00, March 12th       ---implementing a measure to reduce the D/W pressure ----------------
11:00, March 12th       ---reactor has been cooled by isolation condenser, it is stopped-----
11:00, March 12th       ---pressure in D/W is reported increasing, and water level dropping--
10:04, March 12th       N/A     N/A     0.76      N/A      N/A    N/A       N/A    N/A   CNIC
09:20, March 12th       N/A     N/A     N/A       N/A      N/A    N/A       N/A   -0.65  CNIC
08:45, March 12th       N/A     N/A     0.76      N/A      N/A    N/A       N/A    N/A   CNIC
05:20, March 12th       N/A     N/A     0.87      N/A      N/A    N/A       N/A    0.50  CNIC
02:45, March 12th       N/A     0.85    0.87      N/A      N/A    N/A       N/A    0.50  CNIC
00:00, March 12th       ---- radiation risk, government has ordered a 3 km evacuation zone --
00:00, March 12th       --------- cooling is by isolation condenser -------------------------
22:00, March 11th       N/A     N/A     N/A       N/A      N/A    N/A       N/A    0.55  CNIC
17:35, March 11th       ----- ECCS started automatically, due to increase in D/W pressure ---
17:32, March 11th       --------------------S/C temperature reaches 100 C -------------------
16:36, March 11th       -------------------reactor isolation pumps stops, batteries empty----
15:41, March 11th       ----------plant has lost all power , including emergency diesel------
14:42, March 11th       7.3     7.3     0.1       0.1      286    286       N/A    >1    BWR op. param
14:42, March 11th       -------------------earthquake, loss of offsite power-----------------

RP:  Reactor pressure  
D/W: Drywell pressure  
S/C: Suppression chamber(wet-well) pressure      
FNT: Feedwater nozzle temperature    
BHT: Bottom head temperature
WL: Water level in reactor in meters, relative to fuel top
dscale: below pressure meter scale (less than 0.100 MPa)
uscale: above pressure meter scale (more than 0.400 MPa)
N/A: data not available
Data Source:Tepco 
Reactor no 1 Reactor no 2 Reactor no 3 * CNIC gauge press. D/W RP(B) Check Time? 06:00, March 13th 0.62 02:00, March 13th 0.58 0.63 01:00, March 13th 0.64 18:30, March 12th 0.67 N/A