UAE nuclear deal may stall as U.S. condemns torture

* Concern over torture video

* Video aired on Capitol Hill

* No timing on when deal will go to Congress for review

By Sue Pleming

WASHINGTON, May 13 (Reuters) - The United States said on Wednesday it was very concerned by video of a member of the ruling family of Abu Dhabi allegedly torturing an Afghan man, footage that could stall a civilian nuclear deal with the United Arab Emirates.

State Department spokesman Ian Kelly said the department was consulting with Congress about the agreement, which could be blocked if an outcry over the video grows. The deal could be worth billions of dollars to U.S. energy companies that build and operate nuclear power plants.

"We, of course, are very concerned by this video," Kelly told reporters when asked whether the 2004 torture video was holding up implementation of the agreement, which was signed in the final days of the former Bush administration and has to be sent to Congress for review by President Barack Obama.

"We think it's an important agreement, but, as I said, we are right now in the stage of having consultations with Congress," Kelly said. "At the appropriate time, we'll make the decision," he told reporters.

In part of the video, which has been shown on U.S. television networks as well as at a congressional hearing on Wednesday, an Afghan man is shown being abused with an electric cattle prod, beaten with whips and a plank of wood with a nail on it and driven over by a car at a desert location in 2004.