I have following questions regarding a base load nuclear power plant connected to an infinite grid:

1)Assuming plant control systems are too slow to respond to load rejection transients. In case of partial load rejection how is it possible for the plant turbine speed to overshoot and lose synchronisation with the grid resulting in disconnection? Because even if plant does not decrease its power quickly it should remain connected and keep pumping excess amps forcing other connected load following plants to reduce their power. Can we say that a plant connected to an infinite grid that does not respond quickly enough to load rejection transients due to slower response time or faulty controls should not disconnect from grid unless grid frequency crosses limits?

2) Assuming following characteristics:
Plant can reject or increase load at 5%F.P./Min ramp and 10% F.P. Step load without opening of steam dump valves. Since the plant is base load and operates at full power therefore, in case of decrease in grid frequency it is impossible for this plant to increase its power. For load rejections, how plant droop should be set? Equal to overall droop setting 5% or 4% or at some higher value because its a base load plant and it should not respond to fast changes in load rejections? Should there be any droop settings at all?

 

Okay; I gotta ask.

Where is the plant located?

 

CSA, I realized my mistake after I posted these questions. I re-read your post for my earlier thread and also did some searching. I think I got the answers. But would be very grateful if you post reply again, including this: What kind of events cause severe transients that last less than a second?

Regarding location of the plant just assume it is located in region with not so stable grid. Thank you so much for posting replies to my earlier thread, I posted a reply after you left i hope you read that.
Regards.

 

I learned something many, many years ago when I started university and it has to do with the spelling of the word 'assume'.

A - S - S followed by U followed by M - E.

"Making assumptions makes an @$$ of you and me." The Dean of Instruction said that in a speech he made to the freshers on the first day. I've never forgotten it.

And it's even more true today than it was then.

The kinds of events you are asking about could best be alluded to by Phil Corso, P.E. They're probably best described with lots of vectors and phasors and formulae. All I know is, it takes some pretty darned good electronics to sense the conditions and switch them breakers for that 1400 MW heater element for half-second events.

Best of luck with your endeavor!

 

It would be really nice to post your answers here, or least give us link to your earlier thread so we can read too.

Cheers

 

http://www.control.com/thread/1234977197#1235414602

 

>http://www.control.com/thread/1234977197#1235414602

CSA, Never new word 'assume' could be explained this way, thanks. )


http://library.abb.com/global/scot/...8bd6/$File/5STB 13N6500_5SYA1035-04May 07.pdf

http://www.id.abb.com/product/db0003db004291/c12573e7003304adc1256b820064c2ea.aspx

http://www.simplexdirect.com/LoadBank/Jupiter.html

Regards.

 

I am currently working on grid stability study for a US nuclear project. Can you advise me on the ability of new Gen III reactors to perform a high frequency load reject? It seems that the plants that have full bypass and island mode capability can have relays set to perform this function.