I just saw this thread, sorry I have been very busy. I can give you some representative numbers off the top of my head, more exact numbers when I get a chance to get to work and review some design documents.
David wrote:
... Anyone else have thoughts or seen technical data? Can you help with some questions?
What is the total pumping power in a PWR (say 1000 MWe), I think I recall about 8 MWe?
1000MWe is about a 3300MWth core and would need about 5-6MWe per RCP. A 4 loop plant would be 20-24MW of pumping power total.
David wrote:
Does anyone know the fraction of this power needed for pressure drop across the core? Does anyone know what this relates to in driving head across the core (given as feet of head or pressure drop in psi).
~60ft head moving 400E3 gpm @ 550F/2300psi. Temperature rise across the core is about 60F.
David wrote:
Anybody care to figure out the actual pumping power they'd get from thermosyphoning (you just need to find the density difference between the inlet and outlet water and work in the chimney height from their tech figures). You typically get only a tiny bit of pumping power unless you have a phase change like a BWR.
It's about 4-5% of the normal flow with the same 60F temperature rise.
Remember these numbers are from my sometimes fuzzy memory, I can look this up tomorrow and post the actual numbers from an operating PWR. Assuming I can find the time.
David you may also find this paper interesting:
http://www-pub.iaea.org/MTCD/publicatio ... 74_web.pdf