Security warnings at UK nuclear facilities hit 12-year high as inspections fall

Exclusive: Fears over regulator's ability to cope with planned expansion in nuclear energy

The number of formal reports documenting security issues at the UK's civil nuclear facilities has hit its highest level in at least 12 years amid a decline in inspections, the Guardian can reveal.

Experts said the news raised concerns about the regulator's capacity to cope with planned expansion in the sector.