The U.S. Nuclear Regulatory Commission says a Canadian company has agreed to take steps to improve safety after three workers were exposed to yellowcake from Wyoming.
Yellowcake is a form of uranium that has been mined but not yet processed into nuclear fuel.
The NRC says the accident happened June 23 at a facility in Canada. The lid on a 55-gallon drum containing yellowcake blew off and ejected almost 60 pounds of yellowcake into the air.
The NRC says three workers were exposed to airborne uranium.
The NRC announced Friday that Toronto-based Uranium One has agreed to investigate and develop a plan to ensure the safety or other yellowcake drums from Wyoming.
The company also is supposed to develop a safety plan for storing, shipping and processing yellowcake.