WASHINGTON: President Donald Trump declined to issue quotas for domestic uranium production late on Friday and instead ordered a 90-day governmental review, a decision praised by US nuclear power generators who fear curbs on fuel imports would boost costs.

Trump said in a written memorandum he did not concur with a US Commerce Department investigation that found uranium imports threaten to impair US national security.

Trump wrote that while findings "raise significant concerns" he was ordering a deeper review by several government agencies. "A fuller analysis of national security considerations with respect to the entire nuclear fuel supply chain is necessary at this time," he wrote.

The United States sourced just 7% of its uranium domestically in 2017, with most of the rest coming from Canada, Australia and Russia, according to the Energy Information Administration.

US uranium mining firms, as well as more than two dozen western state lawmakers, have argued that nuclear generators rely heavily on adversaries such as Russia, China and Kazakhstan for uranium supply from their state-owned companies, who flood the market.

Petitions from Colorado-based Energy Fuels Inc and Wyoming-based Ur-Energy Inc seek quotas requiring 25% of the US uranium market be sourced domestically.

Last year, the Bureau of Land Management and US Forest Service approved the expansion of Energy Fuels' La Sal and Daneros mines, the latter of which is located just outside the Bears Ears National Monument in Utah.

Electric utility companies with nuclear power plants, including Duke Energy and Entergy, fought hard against the miners' petitions, arguing that their costs would spike if they were forced to source uranium domestically.

A group of nuclear power generators, called the Ad Hoc Utilities Group, said it was pleased with Trump's decision. "It is clear the Trump administration recognizes the enormous economic and resiliency benefits that the US nuclear energy industry provides to Americans," the group said in a release.

Utilities had pushed back against the miners' argument that the utilities relied on Russia, China and Kazakhstan, saying that the United States, Canada and Australia together accounted for nearly 60 percent of the US uranium supply in 2017.

Trump said the working group would make "recommendations to further enable domestic nuclear fuel production if needed."