Labor may oppose a high-level nuclear waste dump, even if the South Australian Government decides to build one, a federal Labor MP says.

The State Labor Government is consulting on the proposal following the recommendations of the Nuclear Fuel Cycle Royal Commission.

But Labor MP Nick Champion told a forum in Adelaide that he is against it, and would not want one in his electorate, which covers the northern suburbs and the Barossa Valley.

"I think the transport of it. I think the actual construction of it, the fact that nobody in the world has done it," Mr Champion said.

"Canada hasn't done it. I think the Fins have only just established one, I think there is a lot more thinking that would have to go into it before we embarked on such a route."

Mr Champion also raised the issue of the Labor Party's policies, saying it has a national position in opposition to a high-level nuclear waste dump.

"There'd be some interesting debates at the national conference as there has been for the last three decades on nuclear issues," he said

"But at the moment our platform opposes a high-level nuclear waste dump and so I suspect that's the way the policy will be."

Liberal senator Simon Birmingham told the forum it was the strongest opposition he has heard from a Labor MP.

"I've heard Bill Shorten and Penny Wong and Anthony Albanese express reservations about a nuclear waste dump before but I think Nick has put the party platform and position more clearly today than I've actually heard from a lot of others," he said.

"For South Australians who think there is a good opportunity for our economy here, and [Premier] Jay Weatherill appears to be one of them, that's a concerning proposition that you've put that it would seem to be very hard to get cooperation from a federal Labor government if SA is to go down this pathway."

The federal Liberal Government has said it would work cooperatively with the South Australian Government if it decides to go ahead with the plan.