Mind, unrelated to the jump drive, losing your power plant and being stuck in space for 2 weeks without power, is likely a Bad Thing unless the air plant and life support can run off of exer-cycles.
There are techniques available today to extend the air supply aboard a disabled submarine that require little in the way of power. These include LiOH curtains
from this manufacturer.
Oxygen levels may be a problem, but the life support system should include supplemental O2 tanks to bleed off into the ship's atmosphere. US submarines have the capability to both onload oxygen, and make their own supply through electrolysis of water.
Emergency low berths are an option, as they would allow the life support man-days to be extended. A few people (no more than six) kept awake can last quite a while on a minimal power system.
The way I see it, the power load from running life support, to include internal gravity control, is going to be pretty minimal compared to initiating jump or combat requirements. Those items would also be on a ship's vital power bus (things that if lost, the ship is really, indefinitely screwed, like :coffeegulp:.) The S8G reactor on an
Ohioclass submarine has a rated power level of 45 MW from just the
main engines. There are parallel mounted turbine generator sets for AC power that are slightly smaller (I was not a nuke). During normal operations, power availability was not an issue.
You might want Lance Armstrong emergency power generators for the lights if the powerplant goes out though.
