Nuclear materials balance
Detailed records are kept of all nuclear materials received and processed at nuclear sites.
International safeguards inspectors from the European Commission and the International Atomic Energy Agency (IAEA) regularly monitor how civil nuclear materials are handled and accounted for. This is to confirm that nuclear material is not misused or diverted. The monitoring involves a series of checks and inspections. These checks provide an overview of the systems that keep track of civil nuclear material and the records of the quantities involved.
There is detailed information provided by the Office for Nuclear Regulation (ONR) on the Health and Safety Executive (HSE) website about the Nuclear materials balance (material unaccounted for (MUF) figures). This information is published annually.