Hello, I've been tinkering with KSP for a while and finally bought the full version. I now have an operational space station and outposts on Mun, Minmus, Duma and Eve. And lots of dead Kerbals obviously. However, the one thing I've not been able to get to work yet are the nuclear engines - I really want them for interplanetary travel due to the high impulse but the wretched things always seem to explode on stage separation when I use them. Can anyone explain what I'm doing wrong?