It's All In the Timing

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Take a left at the first intersection and find the entrance to the reactor chambers. Avoid the beams at all costs, and destroy the generator at the far end. Watch out for the Nitroglazers... Even though they are in there keeping the reactor temperature down they won't hesitate to attack.
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; Shut down the reactors
: Carefully make your way through the reactor chambers to the primary generator and destroy it.
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=== Briefing ===
Sergeant Wolfe:
: We have to bring those reactors down ASAP!
: Thank god. Kasey and I are all that's left of my team. We were sent to find out what the bane were up to and shut it down, but got wrecked. If you have the firepower, I can talk you through using the intel we've gathered. The first thing that needs doing is to shut down the primary reactor chambers. That should give you access to the rest of the base and be a nice diversion.
: Oh, one other thing... The two plasma reactors fire in alternating sequence so you will need to wait for an opening before darting through the chamber. If you see the core start to fire up, move your ass fast.
: Good to go?
=== Debriefing ===
Headquarters:
: Nicely done, both reactor cores are now offline! That should open a few doors.
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As the overview says, just take left at the intersection. Kill the Bane forces in the first room, go right and you'll get to the two reactor chambers. As the plasma beams fire in alternating sequence you move through the chambers when the other beam is firing.
Being in a chamber while the beam is firing will kill you instantly. When you get to the reactor room, take care of the Nitroglazers first. That will make the cooling units explode... After that the reactor can easily be destroyed with EMP bombs or weaponry.