The Northern Land Council (NLC) says claims disputing the traditional ownership of the Northern Territory site nominated for a nuclear waste dump are "misplaced".

The NLC says the traditional owners of the site at Muckaty Station are an Aboriginal "sub-group" that supports the dump going ahead.

But a lawyer for Aboriginal clans opposed to the project says there are new documents showing the sub-group does not have exclusive ownership of the site, about 100 kilometres north of Tennant Creek.

He says the new evidence validates a call not to put a nuclear waste facility at the nominated site.

The Federal Government's radioactive waste management bill is expected to be debated in the Senate this week.

Lawyer Martin Hyde says evidence shows there is more than one owner of the site.

"Given that these documents show that the mob that have given their consent are not actually the exclusive traditional owners of the site, it is very difficult to see how the process can continue and the Muckaty nomination can continue," he said.

The NLC says it considered findings of the Aboriginal Land Commissioner in the land claim when it nominated the site for the waste facility.

Meanwhile, the Greens say more than 100 people protested yesterday in Tennant Creek against the nuclear waste dump.

Greens Senator Scott Ludlum says the Federal Government's radioactive waste management bill is expected to be debated in the Senate this week.

He says the community is angry that it was not consulted about the nuclear waste facility proposal.

"The general feeling, really, was one of defiance," he said.

"I think the community here has made its mind up that radioactive waste is not coming through the town.

"They're just trying to work out the best way of getting that through the Minister's head."