Recent content by AtomicWombat

I have a nasty suspicion that the rain water simply is passed to the normal storm water system and then to the ocean and/or ground water. The rationale being that on the "design basis" only filtered gases are exhausted through the stack. Remember that the hardened vent was a retrofit.

I agree with joewein. As I take it, the rationale behind the hardened wet well vents is as a last ditch attempt to prevent a hydrogen explosion or primary containment over-pressurisation, on the basis that either event would release more radioactivity (due to catastrophic failure of the...

It really needs a chemical, elemental & isotopic analysis to resolve the issue. As TEPCO is in charge...

Thanks MD, I've lost track of events. Do you have a link for the testimony? Is it known if the "hardened vent" is still open?

Are the AO valves fail-open or fail-shut? In figure Figure IV-2-13 Overview of PCV Venting Facility (Unit 1) on page 154 of your linked document there is only one MO (manually operated) valve in the path to the stack and one rupture disk - presumably set near the wet-well maximum operating...

Hardened vents and filtering. Earlier posts. https://www.physicsforums.com/showpost.php?p=3308489&postcount=7685 https://www.physicsforums.com/showpost.php?p=3433898&postcount=10763 It does appear hardened vents were implemented in Japan and if the NYT article can be believed, they were...

Thanks MadderDoc. Thanks for the linked document. Although it's unclear - the document is not well written - the Emergency Gas Treatment System appears to be part of the Stand-by gas treatment system (SGTS). "Stand-by gas treatment system (SGTS) The system is composed of exhaust fans...

The documents on Tepco's site: http://www.tepco.co.jp/en/news/110311/ Refer to the the site of the high radiation as: "Bottom of Main Exhaust Stuck of Unit 1/2 Connection of emergency gas treatment piping arrangement" And the location of the high radiation inside the No.1 turbine building as...

Exactly where does the pipe come from. It's hard to follow in the Cryptome pictures. It is not the large emergency relief duct from the airspace in the reactor building. It appears to be an emergency steam relief pipe from the reactor circulation, perhaps from the condensers. It may have...

Sorry I meant truck mounted cranes. I'm pretty sure they were there before the explosion in unit 3.

I think what MadderDoc is pointing to (thumbnail) is one of these cranes.

I got it from a news site, and TCups annotated it. It was the first picture released by TEPCO.

I think that's a crane.

Can anyone unzip the topmost 3 videos here: http://www.tepco.co.jp/en/news/110311/index-e.html" I get an unrecognised format with WinRAR.

I've been wondering if there is a separate crane/machine over the equipment pool in each building. It looks like a piece of bent sheet metal to me. I'm wary of drawing anything but tentative conclusions from image analysis, especially since we have no experience of working in these or...