Re: 6 chamber Nuclear Reactor Setup
Yes You could use it as a second reactor, no doubt.
Low-Maintenance reactors are pretty nice, I do agree on that point.
You can run a 3 cell reactor and a breeder reactor and not have to check on either, and still only have to come back and check them at the same 4 hour interval as before.
My reason for saying "make a breeder type reactor" is that the way You are running it now, Yes you are getting one uranium cell back, Your still getting a -2 loss of cells each generation cycle. So regardless of whether you put that depleted cell in there or not, You're still losing uranium in the end.
If You don't want to have to go hunting for uranium eventually You can make a breeder reactor, run it a few times, then switch it to your preferred layout after that until Your low on uranium again.
It's mainly to help self support your reactor systems.
I run a breeder style reactor and a normal reactor, and whenever i have a decent surplus of uranium cells i just switch the breeder to a normal reactor setup, and when i get low again i switch back. I don't have to check up on it constantly as both the normal reactors and breeders have no real cooldowns.. As well, The reactor setup I use only uses 3 cells(no depleted cell) and has a 21 second or so cooldown. That reduces the wait time to about 3 hours, instead of 4, theoretically.
Even if I did come back a bit early, it can run for infinite cycles, so it will never overheat.
Breeder Reactor Setups:
http://www.talonfiremage.pwp.blueyonder.co.uk/reactorplanner.html?7baq0hj5hnxytheu41au4olui=1m101010114010101001019
http://www.talonfiremage.pwp.blueyonder.co.uk/reactorplanner.html?9101qiia11xpishk9m5teqhzms476xac3=101k1010114010101001019
Reactor Setup I Use:
http://www.talonfiremage.pwp.blueyonder.co.uk/reactorplanner.html?93qkkjfufykbie9pp8uqkalr76aw69z4=1k10101001501521s1r11r10
Again, As You can see, none of those reactors requires checking, other than to refill or refuel them every 3 or so hours.
Im not saying You have to do it this way, it's just a suggestion to maybe reduce the effort on your part :)