Recent content by westfield

If we are having a stab at this then I think the steaming was the symptom of the problem, not the cause. Have a look at the red circled keyway on the right in this image that you linked - http://keptarhely.eu/view.php?file=20150408v00gzoofr.jpeg Its one of the steaming locations but more...

Daiichi U5 Yes, well if that's how a multibillion dollar company stages "repairs", even a provisional one as they call it, then I am dumbfounded. Some sort of polyurethane sealant from the hardware store, a wooden block and ratchet straps. The valve body is obviously shot, corroded\eroded...

ZZ the schematic isn't very helpful tbh. What Tepco is reporting here is in the "MSIV Room", outside of containment. Related to this are reports from January and April regarding the U3 MSIV room which I had missed. http://www.fukuleaks.org/web/?p=12208...

Good guess. The vid showed a fair amount of sediment falling from bottom of the fuel assembly as it was extracted from the cask and moved through the gate into the pool of the common fuel pool. Presumably some of the sediment from each transfer remains in the cask as well.

I guess introducing the crud from SFP4 to the common fuel pool isn't something that bothers them. I have no basis for thinking it would be an issue but it seems odd to me that they wouldn't clean them somehow as they transferred them. Not as odd as the blurring of the videos though.

Ok, that's clearer. I'm trying to broaden my understanding of why these hardened vent systems are even fitted to these plants when they are not filtered, it's like they never intend to use them. I appreciate your real life knowledge in the subject. NPP designer I am not :) Are you able to...

I'm confused. Why are you referring to the SGTS filters? If we are talking venting via the "hardened vent" systems at fukushima I don't understand why SGTS filters are involved in the conversation. The "hardened vent" systems don't run through the SGTS filters at fukushima daiichi, they go...

Isn't that jumping to a conclusion? Yes, Tepco say there is water coming out of one of the sandbed drain\s but the source of the water is unknown isn't it? It could be a leak in the containment steel liner but it could be water finding its way down there on the outside of the liner...

Of course there is some engineering to be done but don't the existing "Hardened Vent" lines on these plants already do exactly what you say would need to be done. Are you saying these additional filter proposals are not going to be retrofitted to these existing 'Hardened Vent" lines or are...

TEPCO did attempt to get images of the U1 situation before they contructed the cover over Unit 1. There was some T-HAWK UAV imagery and some crane imagery. However because the roof of Unit 1 collapsed somewhat like a blanket over the whole refuelling floor the view was limited from overhead...

Unit 2 transformer yard - oil level is a little on the low side

I was looking at the sheet steel cladding that's come off that U3 & 4 HV switch building and is laying on the ground around it. The images are not great but I thought there may be more of the wall cladding laying around after the U4 explosion vs before. Difficult to say either way...looking for...

No visible tsunami damage to that building. The corner that is opened up is actually closer to unit 4. The images are not the best but it seems there might be more displaced cladding post U4 explosion. After Tsunami, then after U3 explosion , finally after U4 explosion

I'm not 100% sure but it's likely that the joints in the vent pipe are not bolted together as such, the joints have to allow for expansion so it's more like a "slip joint" hence the clean separation. Is that pipe the vertical stack that was attached to the exterior NW corner of U3 U4 perhaps...

Good point. I wasn't thinking. The U4 shroud and steam dryer are now comparitively insignificant issues compared to the big picture on the site.