Cut off the nose all the way back to the sail. Might as well build a new sub. Just like a bent fender on a unibody van totals the vehicle.
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.
I defer to your knowledge..I thought maybe, from the pic..only the front 25% of the sub would have to be scrapped..
Normally, I would think that the sub could be salvaged, however the San Francisco was commissioned in 1985, and while she was designed for about 30 years of service, the Navy has been retiring a number of LA class SSNs when they reach around 20, and they have more retirements planned for the near future. If the San Francisco wasn't planned for decommissioning in the upcoming years, I wouldn't be surprised if the Navy chose to retire the SF in place of another more healthy submarine.