Was testing the reactor in 1.10, and somehow got this to happen:

Said the stabilzers were fried, but it wouldn't explode. I broke them and the energy injector, and it still didn't blow up.

Open its GUI, it will tell you how long you have until it explodes, its not instant like 1.7.

I'm aware it's not instant, but is it supposed to just sit there without the stabilizers or injector? The only thing that's left is the core. Which doesn't have a gui.