Long distance power station

I usually place nuclear reactor directly under my house. I put it about 20 blocks under the floor, which provides enough security, if there is one layer of reinforced stone aound reactor. I let it explode once and nothing in my house was destroyed, it just left big completely hidden hole under my floor. I dont usually make basement so its fine for me. Also this placement allows me to lead cable directly through the center of my house, which is then easily accessible.

You lose 216 EU per 2048 EU packet (about 10%).
Just a note if you are using EV then you need a HV transformer at each end of the HV cable with the three dot face facing the HV cabling (that will be transmitting EV) and the input one (on the reactor side) toggled with redstone.
By the way 45 blocks should be sufficient. Put it say 100 blocks away to be safe cutting your loss to 80EU a packet or %3.9. One or two layers of reinforced stone will help as well.
At 270 blocks the chunks may not load meaning the reactor will not produce power (unless you have chunkloader blocks) 100 blocks may be to far... I ahve no idea how many chunks MC loads at 100 blocks you 6.25 chunks away at 270 your 16.8~ chunks away.

Build it straight under your house, or your neighbours, or the church. If you're going for a safe design, there's no reason to place it so far away, reinforced stone is your friend, 3 layers should do thet trick if you want to be cautious.

Nuclear reactor isnt dangerous at all you just need 2layers of reinforced stone and your safe. but you also have to make sure that your weakest points (cabels) are also safe. that would be like this. if you have cabel going from your reactour, you should bend it after 2 layers of stone to lets say right and then make wall of 2 or 1 layer reinforced steel where that hole is. well like this


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reinforced stone
anyblock

Actually the shielding depends on the reactor. A basic MarkII will not need as much Shielding as a CASUC (well since a MarkII should never explode you might also ignore the shielding). For a Casuc I would advice 3 or even 4 layers.

if you want to put down a miner any where without worrying about power use 3 LV solar arrays and a batt box and throw a pump next to one of the solar cells with another crate next to that you can run OV scanner and diamond drill with no problem... probably could get by with 2 LV arrays but i like to be safe and they are cheap

Quote from accrsd

from my creative mode tests with nukes though i found that an obsidian lining inside reinforced stone actually proved effective, I'm still doing tests creative mode side to see if obsidian lined blast chambers would have the same result with six chamber reactors seeing how obsidian is cheaper and there's more ways to acquire it

You can't be testing too well, as obsidian is nerfed; Nukes blast right through it!