A small amount of radioactive material leaked while being transported across the grounds of Russia's main nuclear waste processing plant, the facility's management said in a statement Friday.

The leak occurred Thursday on a service road during routine transportation from one part of the Mayak facility to another, it said. An unspecified problem with a hermetically-sealed valve on a cistern containing the material caused the spillage of liquid medium-grade radioactive waste.

No one was injured, and personnel at the nuclear facility, located in the Chelyabinsk region in the Ural mountains, have begun to decontaminate the area, the company said.

Mayak also said that the no personnel or vehicles leaving the compound were exposed to radiation as a result of the leakage. It said radiation levels in the area were within the norm.