The UK’s workplace safety watchdog has reprimanded Shell following a gas leak on the Brent Bravo platform in November.
The Health and Safety Executive (HSE) said Shell has failed to “prevent the uncontrolled release of flammable or explosive substances”.
Its inspector accused the oil major of failing to ensure valves on the rig were kept in “efficient working order and in good repair”.
Shell has been given until March 8 to comply with the improvement notice.
A spokesman for Shell UK said: “Shell UK can confirm that we were issued with an HSE improvement notice on 8th December 2017 in relation to a small hydrocarbon release on our Brent Bravo platform in the North Sea.
“Work has been completed on the platform to comply with the requirements of the notice.”
The platform is situated on the Brent field, 115 miles north-east of Shetland.
Brent Bravo ceased production in 2014 and is awaiting decommissioning.