News and Discussions > History & Trivia
Breaker to Breaker
wlrun3@aol.com:
...where, physically, is the breaker...
...what does engaging/disengaging the breaker entail...
...is this sequence of modes generic in american light water reactors:
...mode 1...power > 5%
...mode 2...startup < 5%
...mode 3...hot standby > 350 degrees
...mode 4...hot shutdown < 350 degrees
...mode 5...cold shutdown < 200 degrees
...mode 6...refueling <140 degrees
...is there a moment, following a refuel outage, when success can be declared...
...if this moment exists, is there a collective sense of accomplishment...
SloGlo:
speeking strikly asa hp, currently out of da power plant loop, da breaker is dat big mechanical device in da switchyard dat connects/disconnects da circuit from da plant to da grid.
of coors, iffen yer listening to da radeeo, 'n ya here 'breaker, breaker...' dey ain't talking nuke.
der issa moment when success kin be declared, 'n a sense of accomplisment kin be phelt. it usta come to me when eye herd dat 'breaker, breaker......'
tr:
...where, physically, is the breaker... in the switchyard
...what does engaging/disengaging the breaker entail... verifying the generator is synchronized properly with the grid and turning a switch in the control room
...is this sequence of modes generic in american light water reactors:
...mode 1...power > 5%
...mode 2...startup < 5%
...mode 3...hot standby > 350 degrees
...mode 4...hot shutdown < 350 degrees
...mode 5...cold shutdown < 200 degrees
...mode 6...refueling <140 degrees
No. Your Mode 1 and 2 above is typical for a BWR. For PWR's, its usually something like Mode 2 is K-effective >0.99, Mode 1 is > 5%. You can check the NUREG-1430 series of documents on the NRC web site for the standard Tech Specs for each type of reactor for the exact definitions (see section 1 of the TS).
...is there a moment, following a refuel outage, when success can be declared... typical criteria for outage success is something like no unplanned shutdowns or power reductions for 30 days after closure of breakers
...if this moment exists, is there a collective sense of accomplishment... Depending on the site, this can mean something like a post outage lunch for everyone on site.
wlrun3@aol.com:
...is anything in the switchyard manually engaged/disengaged...
...the moment I was curious about would be similar to landing in an aircraft...
...is there such a moment recognized by those involved...
RDTroja:
--- Quote from: wlrun3 on May 27, 2008, 09:07 --- ...is anything in the switchyard manually engaged/disengaged...
...the moment I was curious about would be similar to landing in an aircraft...
...is there such a moment recognized by those involved...
--- End quote ---
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.
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