In January 2014, ONR introduced Annex 2 to their document The
Technical Assessment of REPPIR Submissions and the Determination of
Detailed Emergency Planning Zones. This Annex details a description
of the process ONR uses to determine Detailed Emergency Planning
Zones (DEPZs) around nuclear facilities in the UK and the
principles used. This includes both Operational Nuclear Power
Stations and those undergoing decommissioning.
Where there is potential for off-site release of radioactivity
within the UK that would require implementation of countermeasures,
a DEPZ will be implemented.
The changes proposed, primarily relate to the fact that from now
on, in consultation with local authorities, ONR will base its
decisions on consideration of practical and strategic factors, such
as local demographic and geographical features that influence where
the boundary of the DEPZ lies, as well as technical assessments.
These principles allow ONR to look beyond the technical
