Nuclear reactors (EU-mode) single player vs multiplayer difference? [solved]

EDIT: question answered, thank you
Hi,

I am playing Industrialcraft experimental build 657 (industrialcraft-2-2.2.657)
I have no other mods installed except the latest version of forge at the time of installation (forge 1.7.10-10.13.2.1230)

On singleplayer, when I build an EU-mode nuclear reactor, it's power output increases as the core temperature increases. at 0% it's 260 EU/t, and at 80% it's 1000+ EU/t. However, on my friend's server in SMP, the exact same EU-mode nuclear reactor does not have it's power output increase as the core temperature goes up.

Is this a bug? is there a setting somewhere to enable this feature in multiplayer? I'm kinda disappointed, I had a pretty awesome reactor setup based on letting the reactor heat up a bit, and I wish it would work on our server.

Also, assuming the nuclear reactor never reaches 100% heat, does it still have a chance to explode?

Thanks!

...no now that you mention it... i think i may have had mox fuel in the singleplayer one. i did not realize there was a difference. I will test this. Thanks!!