Ehm... no.
A MarkII will never go boom normally. It runs a full cycle but needs cooling afterwards.
Actually building a casuc is totally easy, if you don't go for that much EU/t.
http://www.talonfiremage.pwp.b…0101011a01521s51lvc011r10
This is redicolous easy to build and provides a lot of power. Which is just straight forward way too strong.
A reactor like this
http://www.talonfiremage.pwp.b…1k101010037ps011111101110
provides reasonable power and actually for quite a long time. It gives 12.000.000 EU or 600 Blocks of Lava for one cycle. Given that you only need 4 Uranium for this it is suitable of providing a lot of power. You will run out of easy to access lava way before you run out of uranium. And of course this reactor is basically fire and forget, since you place some Uranium in it and have 2 hours to do something else. So even in the first cycle the reactor provides you with 7 diamonds if you feed the energy into a mass-fab or 10 Iridium-Ore (enough for a piece of Q-Suit). So after 4 Cycles you have enough materials for the Q-Suit (based on the useable parts, since the chest is normally dropped for a lappack).
So technically a CASUC only does some minor things:
1. It increases efficiency by 33% and more.
2. It is way cheaper than a regular reactor
3. It is able to burn more uranium at a time.
All 3 things together just cause the problem mentioned by the OP. With BC or RP there is no reason to build a regular Reactor using the new methods since a basic casuc only needs to work with 16 uranium-cells to reach eff4 increasing the efficiency by 33%. So you only need to place 3 new buckets per second into the reactor, since you have at least 8 Slots with one Chamber or 14 with 2 chambers this is totally easy.
I know it is fun to build and manage CASUCs yet they are hilarious OP and I would understand and actually approve if reactors got changed to not accepting tubes or pipes. Since this would make the new reactor-features worth using.