PWR Pressure Drop: Plenum to Plenum Pressure Drop

AI Thread Summary
The discussion centers on the plenum to plenum pressure drop in Pressurized Water Reactors (PWR), with participants recalling figures around 25-27 psi at hot conditions for a conventional 12 ft core. There is mention of a total pressure drop of approximately 40 psi when including additional components like steam generator tubes and reactor coolant piping. The sizing of Westinghouse 3400 MWt PWR Reactor Coolant Pumps (RCPs) is also referenced, indicating they are designed for about 100,000 gpm at 40 psi. Participants clarify that the 25-27 psi figure pertains specifically to the core, while the overall pressure drop in the primary loop is higher. The conversation highlights the importance of distinguishing between core pressure drops and total system pressure drops in PWR systems.
matt222
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For pressure drop of PWR, what is the plenum to plenum pressure drop?
 
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It has been years since I worked on these things, but I recall it was about 40 psi.
 
matt222 said:
For pressure drop of PWR, what is the plenum to plenum pressure drop?
About 25-27 psid at hot conditions across a conventional 12 ft (3.66 m) core.
 
Astronuc said:
About 25-27 psid at hot conditions across a conventional 12 ft (3.66 m) core.
Astronuc, if you include the steam generator tubes and other reactor coolant piping, does it add up to about 40 psi? I thought I remember the reference Westinghouse 3400 MWt PWR RCPs being sized for about 100,000 gpm @ 40 psi.
 
edgepflow said:
Astronuc, if you include the steam generator tubes and other reactor coolant piping, does it add up to about 40 psi? I thought I remember the reference Westinghouse 3400 MWt PWR RCPs being sized for about 100,000 gpm @ 40 psi.
I was referring to just the pressure drop across the core. The pressure drop around the primary loop or across the reactor coolant pump, is of course greater, and 40 psid seems about right. I have the actual numbers somewhere.
 

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