Cause Still Unknown for #Fukushima II (Daini) Nuke Plant Pressure Rise in Reactor 1 Building

TEPCO doesn't have much to say about the rise in pressure in the Reactor 1 building at Fukushima II (Daini) Nuclear Power Plant after the M7.3 earthquake on December 7, 2012.

Yes they pumped the air out, thorough the exhaust duct, but no they don't know why the positive pressure happened. Just like anything else, they don't know the reason, but do immediate patchwork so that the undesirable conditions go away, for a short while at least.

Hardly anyone pays attention to Fukushima I or II Nuke Plants or the workers there any more, anyway. People are having a good time electioneering, and many net citizens are feeling righteous about cheering for the candidates and the parties who profess anti-nuclear (beyond nuclear, graduating from nuclear, whatever) sentiment.

Here's from the English press release from the incurious TEPCO on 12/8/2012 about Fukushima II (Daini):

At around 5:18 PM on December 7, a M7.3 earthquake occurred at the offshore of Sanriku. Upon plant checkup, no problem originating from the earthquake was found.

Since the pressure in Unit 1 Reactor Building had turned positive (though the pressure is kept negative to the outdoor air), the standby gas treatment system* was started upon judgment of an operator. The pressure in the Reactor Building increased to 0.05kPa right after the system was started and later the pressure turned back to negative and became stable. In order to investigate the cause of the pressure turning to positive, the standby gas treatment system was suspended and the Reactor Building ventilation air conditioning system was started on December 8. The pressure in the Reactor Building is being maintained in negative after switching the system. The cause of the incident will continue to be investigated.

* Standby gas treatment system: System that purifies the air in the Reactor Building utilizing high performance filter and discharge it to the outside through the exhaust stack. The system is comprised of systems (A) and (B).

By the way, remember the fluctuation of the water being injected into the Reactor Pressure Vessels at Fukushima I (Daiichi) Nuke Plant, back in August? The fluctuation was supposed to be due to the shaving debris from pipe installation clogging the mesh screens placed at the valves, and after cleaning the debris in the tank and flushing the pipes all were supposed to be OK. But no, the water continues to fluctuate to this day, and all TEPCO does is to adjust the water amount.

Curiosity may kill the cat, but I hope TEPCO's incuriosity will not kill us.

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