Australia's switch to nuclear-powered submarines is prompting a government push for the fleet to be built faster, possibly at the expense of local industry content, to make up for time lost under the now-scrapped French deal.

The previous deal would have seen the submarines built at Adelaide's Osborne facility, using the winning French design.

However local defence companies fear the decision to use the new AUKUS alliance with the United States and United Kingdom to acquire nuclear submarines will see significant amounts of work go offshore.