NSPS took charge Sunday and said that all personnel of the previous security company at Oak Ridge had elected to join their company in protecting the facility where weapons-grade uranium is stored.
"We are extremely pleased with the smooth transition and proud to be a part of the Department of Energy team at Oak Ridge," said NSPS President Ignacio Balderas.
"The protective force services contract will be managed from the local NSPS office in Oak Ridge and we look forward to playing an active role within the community."
The services of a British-owned security firm's subcontractor were terminated after Babcock and Wilcox's Y-12 were canceled after anti-nuclear activists last year cut through a perimeter fence and painted slogans on a building.
NSPS is a joint venture company of Triple Canopy Inc. and Securiguard Inc. The contract for protective services is for three years with a two-year option.