I think I found a bug. Looking at the nuclear reactor with either nano or quantum helmet on, corrupts the world.
Error log:
Code
2012-09-05 21:50:33 [SEVERE] A critical error has occurred.
java.lang.NoSuchMethodError: ic2.api.IReactor.getMaxHeat()I
at ic2_upgrades.IC2_GUI_handler.drawMeterResult(IC2_GUI_handler.java:504)
at ic2_upgrades.IC2_GUI_handler.draw(IC2_GUI_handler.java:90)
at ic2_upgrades.mod_IC2_upgrades.onTickInGame(mod_IC2_upgrades.java:68)
at BaseMod.doTickInGame(BaseMod.java:48)
at cpw.mods.fml.common.modloader.BaseModTicker.sendTick(BaseModTicker.java:95)
at cpw.mods.fml.common.modloader.BaseModTicker.tickBaseMod(BaseModTicker.java:83)
at cpw.mods.fml.common.modloader.BaseModTicker.tickEnd(BaseModTicker.java:55)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:127)
at cpw.mods.fml.client.FMLClientHandler.onRenderTickEnd(FMLClientHandler.java:281)
at net.minecraft.client.Minecraft.x(Minecraft.java:875)
at net.minecraft.client.Minecraft.run(Minecraft.java:750)
at java.lang.Thread.run(Thread.java:722)
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Tested on IC2 1.103 with other mods, including IC2NuclearControl, not sure if that's relevant.