The Office for Nuclear Regulation (ONR) found that workers failed to ensure that the electrical cabling was deployed safety while undertaking work on the cooling water valves in one of the facilities at Hunterston B.
Although no injuries were sustained the incident, in November 2025, presented a significant potential risk to worker safety.
The improvement notice requires EDF Energy to review, revise and implement arrangements to ensure that all 415V portable equipment at Hunterston B is appropriately constructed, maintained, tested and controlled.聽
The licensee has also been ordered to strengthen its risk assessment processes and improve arrangements for personnel undertaking electrical work on the site.
Tom Eagleton, ONR's head of safety regulation, decommissioning, fuel and waste sites, said: 鈥淭he safety of workers at nuclear licensed sites is a key priority for us. While no one was hurt on this occasion, the potential for serious harm was significant. It is essential that EDF Energy implements the necessary improvements to ensure this cannot happen again.鈥�
EDF Energy is required to comply with this notice by 20th March 2026.
ONR served the improvement notice under the Health and Safety at Work Act, 1974, Section 2 (General duties of employers to their employees) and the Electricity at Work Regulations, 1989, including Regulation 4 (Systems, work activities, protective equipment); Regulation 7 (Insulation, protection, and placing of conductors); Regulation 10 (Connections); and Regulation 14 (Work on or near live conductors).
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