i think i could manage that power output...using a burst reactor line. assuming each reactor would only run for 1 or 2 ticks before a cool-down cycle. my limit at this point is tricky because the HV transformer has to be connected directly to the reactor, or i'll just burn the hv cable. each reactor 'pulses' when it reaches less than 10 heat, and pulse at different intervals. this would also cause the power to be a little more even, and sustained. the burst reactors would also need refueled less often, if ever (depending on how long you want to play).
if you can build that facility, a few of these reactors should be a breeze.
i don't think steam will work at all for this.
for the reactors...burst reactor
2 seconds is a safety threshold imo. throw more cells in if you want.
at 5360eu/t, 3 of these will meet your threshold, with excess
214,400 eu per reactor pulse.
spam them (10+)
a small solar spam on top of the containment building(s), and you'd be set.
challenge completed.