News and Discussions > History & Trivia
Breaker to Breaker
HydroDave63:
--- Quote from: RDTroja on May 27, 2008, 10:37 ---There is a very large 'link' between the switchyard and the grid that raises (hold your arm out straight, palm up, make a fist and bend your elbow upward to get the picture.) It is very impressive to see if it is very humid or a little foggy out as the moisture in the air causes a visible arc as the connection is broken. Lots of Snap, Crackle, Pop.
There are several moments of significance including Rx critical, connected to grid and the aforementioned 30 days. There is also a 100 days milestone. There is rarely a collective cheer, but often a synchronized sigh of relief.
--- End quote ---
A short video of opening a disconnect under no load but 33 MVAR of residual charge (the ckt switcher inside the insulators was failed, so it had to be done this way). A long and very informative narrative is also found on the website. Had the upstream breaker not been opened, the Jacob's Ladder could have reached the 500 kV line, with resulting physics effects...
http://www.arcfault.org/video.htm
RDTroja:
--- Quote from: HydroDave63 on May 27, 2008, 01:38 ---A short video of opening a disconnect under no load but 33 MVAR of residual charge (the ckt switcher inside the insulators was failed, so it had to be done this way). A long and very informative narrative is also found on the website. Had the upstream breaker not been opened, the Jacob's Ladder could have reached the 500 kV line, with resulting physics effects...
http://www.arcfault.org/video.htm
--- End quote ---
Very cool video. A horizontal version what I described. I have seen them produce an arc, but not like that one, of course.
Fermi2:
Mode 2 in a BWR is typically when you put the Mode Switch in Startup. It's not power dependent. What drives the change to Mode 1 is putting the Mode Switch in Run prior to getting to the IRM or Low Power Setdown Reactor Trips. Typically this is done at around 7 or 8 % power as you bwant to ensure all the APRM Downscale alarms are clear otherwise you'll get a rod block and cannot increase power. The bottomline in a BWR the Modes are not power dependent, they are slected on the basis of a switch position.
You also got Mode 6 wrong. Mode 6 is less than 140F with a Head detensioned.
Mike
wlrun3@aol.com:
...minneapolis to manila...non stop...747...land...left seat looks at right seat...
...quadruple bypass...surgeon puts down instrument...looks at nurse practitioner...
...bond trader in new york at solomon gets out of his chair after eight hour session buying and selling currencies as trading day moved from tokyo to rome...
...somewhere there must be a quiet few who are awed as they add a thousand megawatts of nuclear generated electricity to the grid that supports this breathtakingly stunning civilization...
...is there no 'wow' moment...
vikingfan:
--- Quote from: wlrun3 on May 26, 2008, 07:54 ---
...is there a moment, following a refuel outage, when success can be declared...
--- End quote ---
yes when the plant management starts to smell steam !!! in other words they know the turbine will start making money soon !!
karma to bz for correcting the mode 6 statement !!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version