WEST Australian Nationals leader Brendon Grylls denies there is any fallout from nuclear issues or the royalties for regions carve-up in the state's Liberal-Nationals power sharing agreement.

Mr Grylls today said the partnership between the Liberal government and the Nationals, who hold the balance of power in the new parliament, was working well despite reports of a clash over his views on nuclear waste.

Perth newspaper The Sunday Times today said the Nationals were on a collision course with the Barnett government because of Mr Grylls' stance that WA should accept nuclear waste from around the world.

Premier Colin Barnett, while declaring his readiness to open up the state to uranium mining, has ruled out any plan for a nuclear waste repository in WA.

Mr Grylls said today the issue was "not on the radar''.

"Three years ago I made the comment that if you support reducing world carbon emissions then nuclear power is a way of doing that,'' he said.

"If there's going to be nuclear power there'll be spent fuel rods. If there's going to be spent fuel rods and you're concerned about their safe storage you might want to think about storing them where we have got control rather than where we haven't got control.

"That was the last of it.

" ... if it was on the radar it would have to be a referendum issue, you couldn't possibly campaign on it.

"I'm not going to use weasel words to deny what I said three years ago.

"But in context, I've got a lot on my plate at the moment and it's about regional development, its not about nuclear power.

" ... I'm not quite sure that it's driving a huge wedge between Colin Barnett and myself.''

Mr Grylls also said the Nationals were happy with the Liberals' handling of the royalties for regions agreement, despite claims by the Labor opposition that the deal had turned out to be "a fraud''.

The Liberals agreed to the plan, under which the regions will receive 25 per cent of mining royalties for infrastructure and services, after failing to form government in its own right at the September 6 state election.

The Nationals had demanded that either the Liberals or Labor commit to the deal, worth $675 million in the first year, for the party's support in parliament.

Opposition regional development spokeswoman Alannah MacTiernan said it appeared little "new money'' would be made available for the plan, as two thirds of the spending would be for projects already funded by Labor in the budget forward estimates.

The alliance agreement also provided for all of the Liberal party's election promises to have first claim on the remaining funds, she said.

Mr Grylls said Ms MacTiernan was wrong and that the commitment was for 25 per cent of mining royalties to be spent on regional projects that were yet to gain cabinet approval.