If it's going to be a long term issue I expect it would be possible - not easy, but possible - to jury-rig a filter/condenser for the steam.

Longer term there would also be an issue with corrosion. I'd expect there would be a move towards restoring flushing out the sea water and replacing it with de-min coolant again.

I'd guess someone has thought of this already.

What's more of an issue is containment over the next 48 hours. If containment is lost, steam production becomes academic.