Snake robot used for inspection of lab at Dounreay

A snake-like robot has been used to inspect a potentially hazardous area at the site of Scotland's largest nuclear clean-up and demolition project.

Dounreay on the north Caithness coast opened almost 70 years ago as the UK's centre of fast reactor research and development.

It is now being decommissioned and demolished.

The robot developed by a University of Nottingham team was equipped with a camera, lights and radiation detector for its investigation of a part of redundant laboratory that had not been seen for more than 40 years.

Nottingham's snake robots can measure from 4mm to 40mm in diameter and usually stretch from 3m to 7m in length.

One of their main uses has been for inspections and repair of aircraft engines.

The 7m-long robot made for Dounreay was able to fit through a 30mm gap to investigate a containment chamber called a shielded cell.

Dr Xin Dong, an associate professor at the University of Nottingham, has been involved in the development of snake robots for 14 years.

He said the machines were controlled like a puppet on wires.

"Our puppet is a really long snake-like robot," said Dr Dong.

"You have a lot of joins, you have cables and you pull those cables to change the orientation.

"Instead of hands we can use motors and computers to control snake robots."