While carrying out analysis work in a Sellafield site laboratory, a worker spilled approximately 1kg of depleted uranium trioxide powder while moving a container.
The material is not harmful unless ingested or inhaled.
The correct safety procedures were followed and the immediate area was evacuated before returning to normal service on the same day.
Health checks confirmed the worker suffered no ill effects.
An internal investigation is being carried out.
The event has been rated 1 (anomaly) on the International Nuclear Events Scale
Sellafield is regulated by the Office for Nuclear Regulation and the Environment Agency