both are supposed to work, i encountered the same problem with 1 mb. It happens when im out exploring. It exploded after i had a trip to the nether so im guessing it has something to do if the generator misses a tick or something. I do not need ejector upgrades in the steam turbines as im using steves factory manager to pull out all fluids. Iv'e tried using ejector upgrades but it makes no difference. My lava setup has been working without fluid ejector upgrades for at least 5 hours now without a problem. i could try increasing the pace at which steve's is pulling out fluids with i suppose. Right now im pulling every one second, maybe i should go with once per tick instead and se if that solves it.
Superheated steam or steam is not supposed to be able to accumilate in the kinetic steam turbines, they should be consumed as soon as they enter the turbine however all of my problems stem from either steam accumulating in the second reactor (this is not so bad cause it only waste distilled water and the cooling still works) This happens almost every time i step through a portal. Then it happened with the first turbine which shut of the cooling to the reactor which quickly resulted in an explosion. At least i have proper safety measurements for my new reactor.
Edit: Went to the nether and the same thing happened again, luckily the safety mechanism saved the reactor this time. For some reason the kinetic steam turbine bugged when i went throught the portal. This is strange considering ive chunkloaded my base. Really at loss at what could be the problem. This time the lava setup also failed so it seems to be steam generators/kinetic steam generators in general that has a problem
I think i have made a safety that works
http://prntscr.com/4qllew. I forcefully void all superheated steam and steam from the kinetic steam generators via steve's factory manager. This prevents the blockage that happens when i go through the nether portal and makes the process go smoothly. Since normaly no steam or superheated steam appears in the generator it does not affect its normal operation.