So, I have a nuclear reactor, connected to a MFSU, to my machines, everything goes perfect, now, I want the reactor to turn off when the MFSU gets filled, but I don't want the reactor to turn on until the MFSU is empty (or almost empty), I know a reactor turns off if it receives a redstone power, since the MFSU can send redstone power, I want to know if I need to do a complicated redstone logic gate, or something. Sorry if this has been posted before, I'm new here 
Help with nuclear setup?
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Yeah, I think the easiest way of doing this would be to set up some manner of flip-flop system, with a buildcraft gate turning the output off when the MFSU is full, and another one activating it when it's empty. It's possible to do with vanilla redstone, I think, but not easy.
My advice would be to use redpower and buildcraft gates (if you're on 1.3.2, then you might be a while waiting for redpower)
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Well, there's a couple of ways to do this:
Simple solution: NOT gate which powers the reactor, but when it receives a signal from the MFSU from being full, it turns off. Previously, you didn't need a NOT gate, due to the reversal of redpower on nuclear reactor activity from the 1.106 patch.
Simple problem: When it isn't at full, it'll continue going.
Fix for simple problem: From Redpower2 mod, there's a logic gate called a State Cell. Basically, the signal from the MFSU triggers the state cell, which outputs a signal on a timed response. So, for example, when triggered, it waits at least, say, five minutes or so before turning back on again.
Even simpler solution: The addon mod Nuclear Control has something which can do this.
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Then just run redstone straight from the reactor to the MFSU, and set the MFSU to emit redstone when full.
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take 2 MFSU
1. will turn the Reaktor on when it is emtpy.
2. will turn it off if it is fullthere is always an easy solution
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1. (directly hookup to your machines) emit if empty
2. (last one in your battery) emit if fullyou will need to build a memorycell
(only some redstone and 2 torches)
i made 2 pics with the MFSU full:
and Empty: -
my solution to this is to put an electrolyzer on the mfsu, and then detect the presense of a water cell - turn on at 25%, turn off when full or 75%.
if you have a stack of cells, you can add a 5 min delay on the turn on/off.
(buildcraft logic gates needed to detect specific inventory items)
an rs nor latch remembers which side was last high (design can be found at http://www.minecraftwiki.net/w…le:StandardLogicGates.png), and is only 2 torches, 2 blocks and a small amount of redstone.