The sub is salvageable. IIRC, the reactor stuff is in the back of the sub. But it depends on if it is cost-effective to strip out the front half of the sub and repair/replace it. It also depends on if there is a political will to fix it.
If they are scheduled to do a major retrofit, it might be that the reactor is due to be replaced anyway. The area of subs I worked in was under the sail. It is kind of amazing how they can cut a huge hole in the pressure hull to move equipment in and out and then weld the piece back like nothing happened.
Just because the reactor "stuff" is in the back, does not mean that there was no damage. A lot of thought and examination will have to be done before this baby can be considered salvageable.
You would have to disassemble most of the boat and xray and test parts to see if they were weakened by shear forces when the impact happened. There could be seriously weakened bolts and connectors all the way back to the prop. Also, since the Los Angeles Class build is over, there may be a lot of jigs and fixtures needed to manufacture major hull components that are no longer available.
My guess is that it would cost almost as much as a new Seawolf Class boat to repair her.
SO9
I'm not so sure; only a certified marine engineer who is a sub specialist can really make the call. But consider this: EVERYTHING inside the pressure hull specially mounted (ie, using soundmounts) so that it 'floats' relative to the pressure hull - this is to minimize the chance of trasmitting any crew or machinery noise into the surrounding water where an opponent could use it to locate the boat. I wouldn't be surprised if most of the sound mounting was trashed in this event.
- A Freeper sub-vet