Originally posted by Nicolas Flamel
reply to post by jadedANDcynical
Yeah I was wondering about that myself. They went to backup early on the 26th then went back to the main grid:
from the NY Times: www.nytimes.com...
It returned to grid power later Sunday.
So they must have been on backup for several hours at least.
Yeah, after going back and rereading a couple of the posts I skipped due to wall-of-text overwhelm, I picked out a tiny mention of the return to the
In doing a bit of research on Ft Calhoun, I found this
interesting report linked on this page
dated 2008 Nov 25.
Among other things is this page:
Note the "component" category.
RPV=reactor pressure vessel
This is the portion of the unit that houses the actual factual core assembly.
Notice how almost every single one of them (on this page, there are others) has "cracking" listed as an "aging effect"
I know this refers to microscopic cracking (or so I hope), but does it seem like the extending the operating license of a nuclear power plant that has
even the tiniest crack in the RPV is a good idea?
It's not a very long report, and there is a lot of information within, so look and see if there's a plant near you which has problems with any of it's
Specifically related to Fort Calhoun is this:
During 2004 through 2005, 15 events occurred related to blockages in service water systems. These events were primarily self-revealing. The
various blocking agents included silt, sand, small rocks, grass or weeds, frazil ice, and small aquatic fauna, such as fish. All these events were of
low safety significance but illustrate the susceptibility of the safety-significant service water system. For instance, in September 2005, NRC
inspectors identified a condition at Fort Calhoun
April 1997 - Fort Calhoun Manual scram and emergency boration following a 6-square-foot rupture
of a 12-inch diameter sweep elbow in the fourth-stage extraction steam piping. A non-safety-related
electrical load center, several cable trays and pipe hangers were damaged. In addition, asbestoscontaining
insulation was blown throughout the turbine building and portions of the fire protection
system were actuated. - IN 97-84
So, nothing too terrible during the time frame covered by this report at this particular plant. May be worthwhile to go looking for one of these that
is a little more current.
reply to post by Vitchilo
Screencaps from that vid:
Pretty sure this shows water all the way up to the main buildings at the level of the white sandbags:
This is probably the main in-bound substation for the plant's offsite power surrounded by berms:
And here is another look at the plant with water right up to the building level, this is toward the end and you see several suits in hard hats walking
on an elevated sidewalk of some sort:
Images are a bit pixilated, but if you watch the video you will clearly see that the water is right up against many of the buildings.
28-6-2011 by jadedANDcynical because: added vid caps