Date: Sunday, June 05, 2011 10:50 +0900 (JST)
The reactor is believed to have suffered a meltdown after the March 11th disaster. The meltdown apparently created holes in the pressure vessel and damaged the containment vessel, letting highly radioactive water flow below ground in the reactor building.
Pressure inside an operating reactor is normally around 70 atmospheres. But after the disaster, the pressure indicator showed 6 atmospheres in the Number 1 reactor, raising questions about data reliability.
On Friday, the utility replaced the gauge with a new one and made measurements again.
The reading was 1.26 atmospheres as of 11 AM on Saturday, almost equal to normal air pressure. The company says this proves that air inside the reactor is escaping outside.
But the utility estimates that the lack of a big hole in the reactor is keeping steam inside, leading to the slightly higher interior pressure.
TEPCO is also planning to install new pressure gauges at the Number 2 and 3 reactors to assess the situation accurately.
Note on above article: It is good to get new measuring equipment in to the reactor, but the MEXT (Ministry of Education, Culture, Sports, Science and Technology) data from the chart below shows that the pressure in reactor 1 is already known to be low at least since May 13, 2011 (which is the earliest value in this data set). It is not exactly news that the reactor pressure has been near 1.2 atmospheres. 1 MPa (megapascal) is approximately 10 atmospheres so multiplying the readings below by 10 gives a fairly close result based on atmospheres.
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Location: Unit 1 nuclear power plant Hukushima Date: Mar 15, 2011 (Tuesday) to June 04, 2011 (Sat) Current values: D / W: .1297 Mpa , S / C: 0.105 Mpa
Date D / W S / C 6 / 04 0.1297 0.105 6 / 03 0.1289 0.105 6 / 02 0.1284 0.105 6 / 01 0.1277 0.105 5 / 31 0.1268 0.105 5 / 30 0.1290 0.100 5 / 29 0.1318 0.105 5 / 28 0.1326 0.100 5 / 27 0.1329 0.105 5 / 26 0.1333 0.100 5 / 25 0.1335 0.100 5 / 24 0.1334 0.100 5 / 23 0.1333 0.100 5 / 22 0.1318 0.100 5 / 21 0.1317 0.100 5 / 20 0.1330 0.100 5 / 19 0.1391 0.105 5 / 18 0.1307 0.100 5 / 17 0.1202 0.100 5 / 16 0.1178 0.100 5 / 15 0.1221 0.100 5 / 14 0.1212 0.100 5 / 13 0.1204 0.100 
Nuclear and Industrial Safety Agency has announced that the plant parameters (reactor state) of the pressure container to graph.
Fukushima Daiichi nuclear power plant reactor 1 can be checked on a daily basis - such as water temperature, pressure dose of 5 items.
As soon as the data is published and updated as the chart.
No. 4 in the absence of inspections stopped reactor fuel assemblies for, are excluded from the list.
Meaning of the terms in the graph below.
D / W stands for dry well .... The main thing containment. S / C ... Sapuresshonchenba stands. I pressure suppression chamber.
※ The value of the graph shows the maximum absolute value of the day.
Click here for live chart
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