Japan Earthquake

Japan Earthquake | Page 1500

@dean just wanted to see if someone would bite, so you could explain what it is? he he
by fitter 6/4/2011 6:49:36 PM

I have seen HVH designated a heating and ventillation HEATER...
by dean 6/4/2011 6:51:12 PM

@dean Now the serious question is... been tracing out the RC structure and trying to decide if in fact (other than pipe pathways) if in fact the molten would end up inthe torus..
by fitter 6/4/2011 6:52:11 PM

in that photo .. the HVH-12 is the deep well return air duct
by dean 6/4/2011 6:53:19 PM

@dean the details on the drawings and further verbage leads me to believe it would funnel down the inside of reactor skirt etc

by fitter 6/4/2011 6:53:19 PM

@ fitter, if you look at the bottom head circumference of the reactor and then begin to look at candidate penetrations where the corium could over heat seals etc like in the safety rod and control rod drives .. or the areas where the drives penetrate to position the nuclear power detection instruments in the core, or the injection lines etc... you can see where pathways of least resistance would be areas of the corium migrating
by dean 6/4/2011 6:56:40 PM

@dean agree, but I don't see to much were they go out into the torus...???? but straingt down the skirt.... containmet... founadion....
by fitter 6/4/2011 6:58:45 PM

Hi dean, don't know if this has already been posted.A reading on March 12th, one day after the massive earthquake and tsunami hit the plant, shows that radioactive tellurium was detected 7 kilometers away. Tellurium is produced during the melting of nuclear fuel.
www3.nhk.or.jp
by Shadow 6/4/2011 6:59:39 PM

@ Edano.. I'm looking for some better print or explanation
by dean 6/4/2011 7:01:51 PM

@dean , is just more confirmation of events we already knew, and TEPCO's lack of honesty.
by Shadow 6/4/2011 7:04:15 PM

@shadow @Dean es posted a Tepco release this morning dated 6/4 that has gamma analysis of soil showing tellurium as late as 5/24...I thought it was pretty interesting. www.tepco.co.jp
by LM 6/4/2011 7:07:31 PM

@dean, hello, good to see you back. I have been researching hardened venting systems in the past days and posted quite a number of references here. I have got two issues you may know about: 1) It seems that the NRC recommended to all operators of reactors with Mark I containments to retrofit a hardened vent. Did they recommend a specific implementation? Did they insist on special filtering? Are these recommendations binding? In other words, are there reactors in the US without hardened vents or with systems that may not meet recommended standards? The second issue is (and that is a question for anyone): Is it known how Tepco implemented hard vents in the reactors at Fukushima? Is there documentation? Thanks, and good to see you here.
by Peter Melzer 6/4/2011 7:07:37 PM

@Edano Oky doky I'll add them to the list. Of course NISA is part of Gov.
by Shadow 6/4/2011 7:09:14 PM

Peter, I've not seen any official documentations that point to how Japan handled or addressed the NRC recommendations, I've heard mixed things so we all need to help try to research it. as far as NRC I thought those were recommended improvements on USA plants but I don't think they were made with the idea that there would be actions taken against the utility companies for not making them .
by dean 6/4/2011 7:14:06 PM

In the same context; Gov't failed to release some radiation projections

www3.nhk.or.jp
by Shadow 6/4/2011 7:14:57 PM

www.gereports.com this GE document says that the changes were required by the NRC..
by dean 6/4/2011 7:19:16 PM

@dean , I am looking a lot. It is already clear that the hardened vent at unit 1 was special in the sense that it permitted backflow into the building. It looked to me from the translation that it tied into the air filtration system that uses fans to push the air out into the tower. Those fans were down, and then some valve that supposed to prevent backflow was not working: www.asahi.com
by Peter Melzer 6/4/2011 7:21:39 PM

@LM Yea, the way it varies may mean something, half life of 34 days. Hmmmm.
by Shadow 6/4/2011 7:21:49 PM

@dean - How come if a car manufacture has to do a Car recall for safety issues it actually has to effect this recall to all countries that the car is sold in...But a Nuclear Reactor manufacturer (General Electric) can just blame or point the finger at the Operator.??????
by Lethbridgean 6/4/2011 7:23:15 PM

@Lethbridgean , there will be a lot of finger pointing. Tepco already stated that the strength of the quake at Fukushima was within design basis, and GE's releases on the matter of safety have been very defensive.
by Peter Melzer 6/4/2011 7:26:06 PM

@Lethbridgean car manufacturers don't recall alot of items that should be... do you ever go to the NHTSA site... plus once they get past a certain age, the car manufactures just sent you a sticker.... I reread mine when I had to go get my bronco out of the yard across the street... (had gone to put my dog back in yard and did not reset my brake.... it was in Park when i left...
by fitter 6/4/2011 7:28:14 PM

@Peter Melzer - It was a rhetorical question. I think alot of the info we are getting is GE PR going on an offensive defense for future legal ramifications.
by Lethbridgean 6/4/2011 7:28:40 PM

@dean , and here I found the counter argument by Beyond Nuclear which made me wonder: www.google.com
by Peter Melzer 6/4/2011 7:30:28 PM

@Peter Melzer every thing I have read on the hardend vents in the US is that they are on a plant by plant design. and that would make sence... as every plant is always built different that the original drawings and there would be years of changes that GE would not know about...
by fitter 6/4/2011 7:31:43 PM

@leth wasnt it a GE whistleblower who forced the shutdown of tepco plants '02 due to them not adhering to ge standards?
by elainekirk 6/4/2011 7:32:57 PM

@Lethbridgean , exactly! GoJ may be preparing the launch of a criminal investigation into possible negligence by the operator re. the omission of safety upgrades at the reactors. Fitter, Hi!
by Peter Melzer 6/4/2011 7:33:47 PM

@elainekirk www.youtube.com was a pretty good story on the GE/TEPCO whisteblower of 2000-ish - interviews the real guy
thankyou darren I will bookmark it to watch when it is quiet at home
by Darren edited by elainekirk 6/4/2011 7:33:56 PM

@elainekirk - there was also a GE whistleblower that got blackballed by GE over the BWR mark 1 design way before that...Like I said legal wranglings are conveinent when you have revisionist history in your favor.
Veritable cess pit they are all in bed with each other
by Lethbridgean edited by elainekirk 6/4/2011 7:35:00 PM

@fitter , I suspect that the retrofits for hardened vents at the four reactors may have been in some way unique
.
by Peter Melzer 6/4/2011 7:37:05 PM