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@Edano I don't think the tsunami broke that. The digital globe pic of right before 3 blew up could give a better answer

@Dean When we handled fuel, we had CRM's( continuos radiation monitors), but the were electronic and only for hirad levels, not n activation. the only thing I am familiar with for n activation is the indium in the TLD (Thermo-Lumenescent Dosimeter), which is the official record of external exposure for nuclear workers, for all:)

Dean, hi. In your chart pinned above the numbers are minutes, correct??

minutes yes billmcd

(suggesting)

@Pedro Jesus @Edano I think we are agreeing on this. Obstruction downstream (specifically HEPA filters) for the combined unit discharge, could allow backup into another building. they were attempting to actively vent r3 and r4 had no ventilation at all. I tell you if steam (from Reactor Building 3) hits the HEPA, very little air is getting through.

The Truth Elastic Power COmpany

In order to answer the question whether H2 backflow to #4 through venting pipe from #3 was possible, we have to find a photo of the stack right after the #3 explosion. I assumed that that explosion already destroyed the connection to #4. As to my earlier question about that pipe running up the reactor building, we saw some clouds that might have been from venting during the arrival of the tsunami waves the other day (can't find the vid anymore). The clouds were produced at the roof line just about where this pipe ends. Perhaps the clouds emanated from such pipe.

Morning.... High radiation in D/W for #1 & 3, and pressures rising in #3 S/C....looks like corium is dripping down lower ?

@Nancy They had to have filtration somewhere in line with the vents. I don't know where, but any exhaust from those Radiological Work Areas (the entire building) had to be filtered and the stack monitored. It could have been inside each building, but I would bet that where there was a combined stack, there was combined filtration.

@Nancy The building pictured is intact on 3/27 which means it is 2, 5 or 6, right?

@Nancy< i just vividly recall the debate about the rusty brown colored smoke emanating from the pipe leading to the stack from #3. That turned out to be a crane boom, when we found higher res pics. On those pics. the connection to #4 was broken.

@Peter Melzer yes. now I don't remember if that was pre or post explosion of 3.

@Nancy - the generators are run off steam turbines, which have no need for and exhaust stack like semi-trucks use... the generators were in a its own building.

@RBeaner yes, that is why I did a double take on that article.

@Lethbridgean so they would need to be on the turbine side and in some configuration near the turbines. So basement of turbine building or in between turbine and reactor?

@Nancy - Not sure I understand that question. What is the "they". The "exhaust" of a steam turbine runs by pipe into a condenser to phase change the remaining steam back into water then that water goes by pipe to the heat exchanger to get phase changed back into steam. Its a closed loop system. Are you talking about the backup diesel generators?

@Lethbridgean I am talking about the diesel generators, not the back up steam loop. We are trying to determine what the round pipe that runs up the side of the building is. That seemed to have crossed conversations about the vent stack system. Sort of 2 different conversations.

This is Tepco's media images/video page (where the media get's all their Tepco release images from). The newest images up the top show the plant getting hit by the tsunami. translate.google.com

The pics @majj has posted give an idea of the depth of the flooding - from the vertical car I'd guess appr. 4 meters.