Eh? But aren't those in the concept just torpedo pods? I'm increasingly inclined to think refit-style tech and previous had the primary reactors in the nacelles themselves. The only "real" difference between refit and TOS would be that refit tech would be more advanced and more heavily interconnected than in the TOS era. The Excelsior might be the first ship to do differently, with no reactors in the nacelles at all. It would certainly help explain the wraparound band around the Excelsior nacelles.