BWR CONTROL RODS ANTIREACTIVITY
BWR CONTROL RODS ANTIREACTIVITY
(OP)
Anyone please help me: how come antireactivity inserted by BWR cross shaped control rods varies from 17000 pcm to 25000 pcm with reactor at power??
Thank you.
Thank you.





RE: BWR CONTROL RODS ANTIREACTIVITY
RE: BWR CONTROL RODS ANTIREACTIVITY
If you work for a PWR reactor there is another question from me For YOU if you can please help me: what is the duty of tha baffle?!?
Does it distribue the flow rising up from the core to render it more omogeneous along the fuel assemblies?!?
P. S : It is funny and great at the same time taht in tha USA you specialize on different reactors!
Here in Italy we do not specialize so far!
Thank you!
RE: BWR CONTROL RODS ANTIREACTIVITY
Approximately 93% of the Rx. coolant flow passes in this manner:
a. Rx. Coolant enters through the Cold Legs
b. The water then flows down around thermal shield annulus between core baffle (barrel) and vessel walls.
c. when coolant enters the lower plenum, the coolant reverses direction and passes through the:
1. Core support forging
2. Diffuser plate
3. Lower Core plate
4. Reactor Core
5. Upper Core plate
6. Upeer plenum and out the Hot Leg nozzles
Approximately 6.5% of the Rx. coolant bypasses the core in the following manner:
1. Nozzle bypass, where the coolant enters the vessel through the cold leg and directly exits through the hot leg without ever going through the core.
2. Control rod and instrument thimble bypass, where coolant enters these channels and is not subject to contact with the fuel clad to remove heat
3. Baffle Wall bypass, where the coolant passes along the baffle and is not subject to fuel clad to remove heat
4. Head cooling bypass, where coolant passes directly into the uppper head region and is not available for rmoving heat from the fuel
Hope that helps!
RE: BWR CONTROL RODS ANTIREACTIVITY