You can put damaged (or not) turbine rotor in disassembler and get rotor blades and rod separately and made bigger rotor with some additional blades and another rod later. IV disassembler is 100% efficient, EV 90% etc., meaning that every component has X% chance to appear in disassembler inventory after process. It's expensive on energy, but you don't use any material resources (especially chrome, you'll need it later much too).
Also be careful as rotor damages, my LHE and then reactor exploded once upon it reach 33% damage or so, though I don't know really was it a reason or it's just water that had depleted (2000L I mentioned before), just saw it after it happened. My memory gives me feeling I read about it somewhere on wiki, but now can't find anything about it anywhere.
In this case I think some safety logic you mentioned is necessary.
Fortunately reactor had containment platings in it so nothing serious happened around, it was just all stuffing and partly LHE lost. 10 containment platings is enough to prevent explosion outside reactor inner zone.
Also 5x5 reactor does not stop if vessel integrity lost, it will still work till redstone signal got to it (redstone port counts too), whatever it written on wikis.
And yes, fighting enderdragon in space with set of nanoarmor and jetpack with...enchanted bow and flint arrow...that was kind of weird. There was mod ic2 combo armors back on 1.4.7 that added nanobow, but apparently it will never get to 1.7.
Also what is your water collection rate? There is another way in getting water: you can grow cactus as ic2 agricultural crop (there will be pretty high yield if you invest some time in selection) and put them in fluid extractor. While it cost some energy you don't need vast rain collection setups and actual rain. You also don't really need any fertillizer too.
Also ic2 crops is great way in resource saving: it increases outcome 4 times, purifies crashed ore + gives additional byproducts. (another way is bees but I dont know what mod they really from (it marked gregtech, but not mentioned anywhere in wiki))