Japan Earthquake | Page 2950
greetings to allby dean 2/5/2012 6:33:22 PM
@dean I looked at those NRC letters they seem to be citing a welding technique where they remove the stainless steel coating on the end of the steam generator tubes before they weld them in place. They think this caused some issues at San Onofre. I can't confirm furtherby lillymunster 2/5/2012 6:37:43 PM
@lilly well, I have seen some altered boysby bo 2/5/2012 6:38:23 PM- I read an article today about the potential hazards of every one in the country flushing their toilets at 1/2 time and thus place a huge burden on the waste treatment facilities around the country.by dean 2/5/2012 6:38:25 PM
- bo... remember put the money your gambling with in your right pocket and when it's empty.. QUIT..by dean 2/5/2012 6:39:18 PM
example of inside a steam generator
by dean 2/5/2012 6:42:44 PM- @lilly.. hopefully they will make the inspection results puplic on onofreby dean 2/5/2012 6:47:45 PM
- @dean good advice!by bo 2/5/2012 6:50:05 PM
- pbadupws.nrc.gov Generic Communications lists potential generic issues that are safety significant, require technical resolution, and possibly require generic communication or action.by dean 2/5/2012 6:50:09 PM
@dean those are all the pipes/tubes??by elainekirk 2/5/2012 6:53:06 PM- @elaine,, it's an inside view of a typical steam generator.. very complex tubing design etc.by dean 2/5/2012 6:53:50 PM
- I have a partial list of reactors with the Mitsubuishi replacement steam generatorsby lillymunster 2/5/2012 6:55:19 PM
- @elaine.. some steam generators have loops for the tubing and others have straight through passby dean 2/5/2012 6:55:26 PM
- @lilly.. good list...would be nice to try and develop problems encountered with the mitsubuishi onesby dean 2/5/2012 6:56:04 PM
- St. Lucie Nuclear Power Plant in Florida
Arkansas Nuclear One plant in Russellville Ark.
remaining operational reactor at the Three Mile Island
Ft. Calhoun,
San Onofre 2 and 3,
Tihange 1 & 2 Belgium,
Doel 2 Belium,
Units F & G France,
Ikata unit 2,
and 2 units in China.by lillymunster 2/5/2012 6:56:20 PM - What is not clear is if all have the same manufacturing flaw. MHI says they have made over 100 of these including units in Japanby lillymunster 2/5/2012 6:56:44 PM
- @lilly, somewhere I have read where MHI advertised the increase in efficiencies in newer SG's and that may have been obtained by changing the tubing material or the way they fabricate with a new thinner materialby dean 2/5/2012 7:02:17 PM
- the flow, vibrations and chemistry control of the primary coolant water and secondary SG cooling water are very critical to the health of the tubing material. The only way they really have to check this is when they perform inservice inspections on the tubing when they shutdown and of course detection of a primary to secondary tube leakby dean 2/5/2012 7:05:38 PM
- @dean MHI units use something called "600" steel where a German manufacturer used "800" steel. I think I have the paper saved. Let me go lookby lillymunster 2/5/2012 7:09:09 PM
- anes.fiu.edu material issues in nuclear power plants.. it's alittle old but has good informationby dean 2/5/2012 7:10:43 PM
- Page 6, Table II has steel and other data on MHI models of steam generators www-pub.iaea.orgby lillymunster 2/5/2012 7:11:21 PM
- @dean link didn't workby lillymunster 2/5/2012 7:11:51 PM
- by dean 2/5/2012 7:15:29 PM
- by dean 2/5/2012 7:16:11 PM
" Tokyo, Feb. 5 (Jiji Press)--Tokyo Electric Power Co. <9501> increased the amount of cooling water pumped into a reactor at its crippled Fukushima No. 1 nuclear power plant Sunday due to a rise in temperatures, the company said.
A main thermometer read 71.7 degrees Celsius at the bottom of the No. 2 reactor's pressure vessel as of 4 p.m. (7 a.m. GMT), a sharp rise from 52.0 degrees as of 11 p.m. Wednesday, said the company known as TEPCO.
The company increased the amount of cooling water injected into the reactor by one ton to 9.6 tons per hour.
TEPCO is examining the possibility that the main thermometer malfunctioned because two other thermometers located on the same level of the vessel showed stable temperatures around 45 degrees, the company said.
TEPCO is required to report to local municipal governments if key thermometers at the plant's reactors reach 80 degrees or it is forced to increase the amount of cooling water by more than one ton per day, under rules set after the plant's accident in March last year.
(2012/02/05-22:39)" jen.jiji.comby UKVal 2/5/2012 7:21:34 PM
Dean's document cites this:
Steam generator replacements were underway at Surry and
Turkey Point where thermally treated
Alloy 600 tubes were used, replacing the
mill annealed Alloy 600 tubes used in
the original steam generators
About half of MHI's steam generators used mill annealed. I can't find any data that shows what model of steam generator from MHI was installed at various reactors.by lillymunster 2/5/2012 7:21:42 PM
Another Fukushima-bird study underway: tvnz.co.nzby Ian 2/5/2012 7:26:58 PM
www.mhi.co.jp reference document put out by MHI.. maybe has somethingby dean 2/5/2012 7:27:13 PM
www.world-nuclear-news.org's Mitsubishi Heavy Industries (MHI) and France's Comex Nucléaire, a subsidiary of ONET Technologies, have been awarded a contract by Electricité de France (EdF) to supply six replacement steam generators (RSGs)by dean 2/5/2012 7:35:39 PM
Stanford paper finds alternative energy better solutions on security, pollution and reliability. The renewable that didn't do well was ethanol. Nuclear tied with coal. news.stanford.eduby lillymunster 2/5/2012 7:38:02 PM
www.mhi.co.jp article on export of high performance and high quality components. talks of cracking on high nickel alloy 600 due to agingby dean 2/5/2012 7:40:46 PM
@lilly. that is the best document due to diagrams of what kinds at what facilitiesby dean 2/5/2012 7:41:54 PM
will return ...by dean 2/5/2012 7:42:25 PM
So Ft. Calhoun and San Onofre both use the new 690 steel and San Onofre still had issues.
All 4 steam generators are using 690 steel also have the thermal treating supposedly the improved method.by lillymunster 2/5/2012 7:44:56 PM
Details on Doel steam generators:
The higher tube density of the replacement steam generator (RSG) compared to the old steam generator (OSG) transfers more heat. And because the tubes of the RSG are made of Inconel 690 cupro-nickel, cracks are less likely to occur. www.neimagazine.comby lillymunster 2/5/2012 7:48:17 PM
backby dean 2/5/2012 7:50:59 PM
@lilly.. they can pick the metals to build them but as critically important is the chemistry control and flows etc. which could vary all over the map in different plants around the globeby dean 2/5/2012 7:52:39 PM
www.dailykos.com san onofre information,, didn't know if anyone had thisby dean 2/5/2012 7:56:44 PM
paper on cracks in 690 steel steam generator tubes from 2009 www.trueflaw.com
They created cracks readily but felt they diagnostic tools found them properly. www.trueflaw.comby lillymunster 2/5/2012 7:57:12 PM
by dean edited by lillymunster 2/5/2012 7:59:01 PM
Consequently, no cracked specimens were available nor had such
specimens ever had been manufactured. .... THAT comment to me is bad.. they didn't make specimens.. called "coupons" for further testingby dean 2/5/2012 8:01:28 PM
@lilly.. good articleby dean 2/5/2012 8:02:01 PM
@lilly.. so many comments in these papers on profitability. naturally they want the best SG's etc and other components but statements like that tend to put $ over safetyby dean 2/5/2012 8:09:04 PM
@dean it seems there were so many old ones known to be leaking yet still operating for years. I have to wonder if this is the cause of all the tritium problemsby lillymunster 2/5/2012 8:14:43 PM
@lilly it could have been a contributing factor but I don't think it was the major oneby dean 2/5/2012 8:17:22 PM
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