Last updated on March 1, 2013
Uppdate 20:00(UTC)/22:00(CET)/05:00(JST)
Reactor 1:
Water level in the core: 1.65 (1.65) meters below the top of fuel assemblies
Flow rate of injected water: 120 liter/minute
Core pressure: 508(517) kPa
Containment pressure: 270(270) kPa
Core temperature(feedwater nozzle): 224.8 Celsius
Core temperature(bottom head): 143.4 Celsius
Dose rate within containment: 34.6 Sv/hour
Reactor 2:
Water level in the core: 1.2 (1.2) meters below the top of fuel assemblies
Flow rate of injected water: 270-280 liter/minute
Core pressure: unknown
Containment pressure: 110 (110) kPa
Core temperature(feedwater nozzle): 123.6 Celsius
Core temperature(bottom head): 111.2 Celsius
Dose rate within containment: 41.6 Sv/hour
Spent fuel pool temperature: 67 Celsius
Reactor 3:
Water level in the core: 2.3 meters below the top of fuel assemblies
Flow rate of injected water: 220 liters/minute
Core pressure: 130 (133) kPa
Containment pressure: 107.3 (107.6) kPa
Core temperature(feedwater nozzle): 13.6 Celsius (obviously error)
Core temperature(bottom head): 121.6 Celsius
Dose rate within containment: 33.7 Sv/hour
No major changes to the status of the reactors. Pressure in all containments seem ok. There is total confusion regarding the measured isotopes in the water in the basements for the turbine halls. It seems impossible to sort it out in any way and we can only wait for TEPCO or NISA to give final word on what they are actually measuring. It is pretty much beyond a doubt that the activities they published yesterday are wrong, it isn’t consistent with the given dose rates.
Update 10:00 (UTC) / 12:00 (CEST) / 19:00 (JST)
No new update from NISA during the night, but a new update from JAIF(link 1, link 2).
Reactor 1:
Water level in the core: 1.65 meters below the top of fuel assemblies
Flow rate of injected water: no new data
Core pressure: 508 kPa
Containment pressure: 270 kPa
Core temperature(feedwater nozzle): no new data
Core temperature(bottom head): no new data
Dose rate within containment: no new data
Reactor 2:
Water level in the core: 1.2 meters below the top of fuel assemblies
Flow rate of injected water: no new data
Core pressure: unknown
Containment pressure: 110 kPa
Core temperature(feedwater nozzle): no new data
Core temperature(bottom head): no new data
Dose rate within containment: no new data
Spent fuel pool temperature: no new data
Reactor 3:
Water level in the core: 2.3 meters below the top of fuel assemblies
Flow rate of injected water: no new data
Core pressure: 130 kPa
Containment pressure: 107.3 kPa
Core temperature(feedwater nozzle): no new data
Core temperature(bottom head): no new data
Dose rate within containment: no new data
Acording to TEPCO the dose rates from the water found in the turbin hall basement:
Reactor 1: 60 mSv/hour
Reactor 2: More than 1000 mSv/hour
Reactor 3. 750 mSv/hour
They have started to drain the water so that work can proceed to restore the pumps.
Links(english)
Kyodo News Woes deepen over radioactive waters at nuke plant, sea contamination
Reuters Soaring radioactivity deals blow to Japan’s plant
BBC Radiation soars at japan reactor
NHK extreme radiation detected at number 2 reactor
Links(swedish):
DN Arbetare evakueras efter akut strålning
SvD Fler svenskar misstror kärnkraft
SVD Nya bakslag vid Fukushima
Aftonbladet tio miljoner gånger högre strålning
Röda berget
Jinge
In your face
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Hi! I have some questions for you. The pressure in the reactor vessel seems to be much lower than in normal conditions (maybe 10 times lower?) Why is this? Is there any circulation of water, I mean how did the water come to the turbine hall when the pumps are not working? How do they inject water to the reactor and where does it go when its turned to steam? Thanks
They have been using mobile fire-pumps to push water inside. Where they connect I don’t know.
The reactor pressure vessel is during normal operation of a BWR around 70 bar(1 bar is 100 kPa). But when an accident happen one wants to drop the pressure down to normal atmospheric pressure to have an easier time putting water into the core. It takes very strong pumps to pump water with a pressure of 70 bar.
We don’t really know how the water is circulating in the reactor. The assumption is that they are injecting water into the vessel through some kind of fire suppression pipe with external fire pumps. In the vessel the water slowly boils and the steam created gets blown out into the wet well(the torus below the reactor) or into the containment where it stays, cools down and condenses. So there is probably no circulation but rather just injecting water and letting it boil into steam.
This is just a guess however.