A TERRITORY federal MP is to vote against forcing the NT to house a nuclear waste dump.

The Liberal and National parties support the Labor Government's National Radioactive Waste Management Bill, which would lead to the $30 million dump being built near Tennant Creek. CLP Senator Nigel Scullion, Labor Senator Trish Crossin and Labor minister Warren Snowdon will vote for the Bill.

But Natasha Griggs said she would defy her party's whips and oppose the law.

"I don't support the nuclear waste dump and I've made this clear in the party room," she said.

"I'm not worried about going against the party line.

"I can't change my mind just because I've been elected. The whole point is that I represent the Territory in Canberra, not Canberra in the Territory." She spoke when the Bill was debated in Parliament yesterday.

Ms Griggs was elected to the seat of Solomon, which covers Darwin, Palmerston and a part of Litchfield, last year.

Her Labor predecessor, Damian Hale, also defied his party whips by opposing the nuclear dump.

The NT Environment Centre yesterday said the new law would undermine the Territory environment and the democratic rights of Territorians.

The centre's Cat Beaton said it singled out Muckaty Station as the only site under active consideration to store nuclear waste.

"If a radioactive waste dump proceeds in the Territory it would impact on all, not just Tennant Creek and the Barkly," said Ms Beaton.

"Nuclear fuel reprocessing waste would be unloaded at Darwin port."