In creative, removing someone's base who's left, they had an IC2 Nuclear Reactor surrounded by heat casing, generating 'Hot Coolant'. Destroyed this in creative dropped all the items into coolant that was inside the reactor and seems to be crashing the server when ever I log back in.

Crash report: http://pastebin.com/RBFuw1VK

NC: 2.3.3Exist
Pack: InfiTech 2