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30 days after the tsunami

Last updated on March 1, 2013

22:00(CET)/20:00(UTC)/o5:00(JST)

Not very much has happened this weekend, below is the status of the reactors. The first numbers are from JAIF, April 10th 18:00 and the numbers within () is from NISA, April 7th 12:00. If there is only one number given its from NISA and from the 7th of april.

A new blog has appeared, Info on #FNPP1 and Irradiation, that updates graphs of several relevant parameters. Very nicely done! I hope they will continuously be updated, very good resource to bookmark. I direct link to the parameter pictures in the table below(i.e click on water level (meter) and you will get directed to the water level graph on the FNPP1 blog).

Core parameters(water level, pressure, dose rates)
Ibaraki and Tokyo radioactivity

 


Reactor 1 Reactor 2 Reactor 3
Water level (meter)* -1.60 (-1.65) -1.45 (-1.5) -2.25 (-2.25)
Flow rate(liters/min) 100 133.33 116.67
Core pressure (kPa) 939 (859) 98 (101)**
Containment pressure (kPa) 195 (165) 95 (100) 106 (105.9)
Wetwell pressure (kPa) 150 172
Feedwater nozzle temp (Celsius) 227.7 (223.8) 159.4 (143.6) 91.7 (88.3)**
Bottom head temp (Celsius) 116.9 112.3
Containment dose rate (Sv/hour) 31.7 30.5 19.3
Wetwell dose rate (Sv/hour) 12.9 0.794 0.768
*Distance from top of assembly
– broken gauges
** Probably faulty reading

Pressure in the number 1 reactor pressure vessel is continuing to climb. It is now about one seventh of normal operating pressure. The containment pressure is also rising, due to the ongoing nitrogen injection. Work proceeds in moving the radioactive water from the turbine hall basements in order to be able to access pumps and other things located in the turbine halls that are necessary to get the internal core cooling working again. After they plugged the leak into the ocean through the cable pit water levels are rising in the tunnel connecting to the pit, so TEPCO is preparing to pump the water from the tunnel to the turbine condenser within the turbine building. Steel sheets and barriers has been put up in the ocean to contain water from flowing freely from leaks into the ocean.

IAEA as usually has written an excellent summary of the status of the Fukushima plant.

I have attached a drawing of the Oyster Creek reactor, it should be very similar to the Fukushima reactors. It shows more detail compared to earlier drawings. The control rod drive pipings sure looks like a candidate for the leakage out of the number 2 reactor!

 

 

Links(English)
LA Times Japan nuclear crisis ebbing, U.S. experts say
Bloomberg U.S. Will Build Five New Nuclear Reactors by 2020, New Energy Finance Says
Reuters Factbox Japans disaster in figures

Blogs(English)
Rod Adams Opportunities and challenges: Cleaning up Fukushima Daiichi
Info on Fukushima
NEI Nuclear Notes (Ir)responsible Speculations
Idaho Saimzdat Fukushima nuclear crisis news update for April 9, 2011
The Nuclear Green Revolution Avoiding nuclear safety
Atomic Power Review Higashidori: Very nearly SBO
Atomic Power Review Sunday Afternoon Update

Links(Swedish)
Aftonbladet Här träffar vågen kärnkraftverket
Expressen Vågen träffar Fukushima
SvD Vilka reaktorer tänker Juholt stänga

Blogs(Swedish)
Peter Linden Miljöpartiet vill släcka ner Sverige
Ringborgs blogg Var finns kärnkraftsmotståndet i en kärnkraftskommun?
Flute tankar Hänt i veckan 3-9 april, del 1
Ögonblick i norr Paralleller

 

 

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