Control Rod
Posted October 13, 2009
By admin
Control rod replacement in a reactor.?
Do the control rods have to be replaced in a reactor? If so how often and what is causes them to need to be replaced? Is there a relation between this and the refueling of the fuel rods? Thank You
I guess I should also ask if the make-up of the rods changes the need for replacement as well (i.e. silver, indium, cadmiumboron, cobalt, hafnium, gadolinium, and europium) Also does this change depending of reactor type (PWR/BWR). Thanks
If you are talking about the control rod drive assemblies then no they don't need replaced very often. Physicall damage due to handling is the only reason I have seen to replace one. As for the inserts in the fuel assemblies. Yes the BPRA are replaced regularly. Burnable Poison Rod Assemblies sorry the industry is filled with achronyms and after awhile they seem just like words everyone knows 
. As the name suggests they are a reaction poisoning material that is burned during the reaction. They are installed in new assemblies to moderate the assembly's burn characteristics. Over time as the assembly ages the BPRA becomes less effective. This gives an even neutron flux across the reactor versus "hot spots" after fueling.
My answer refers to a Westinghouse PWR reactor primarily and generally holds true for PWRs. (Pressurized Water Reactor)
The makeup of the fuel assemblies dictate their burn characteristics hence the specific need for reaction poisoning so yes. I can't speak inteligently about BWRs because I have never worked on one. I do understand that they shuffle inserts around during refueling though.
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