The contractors are joint venture partners in BYLOR JV, and REEL UK.

Pre-planned inspections during three days in November at the Unit 1 HR Building on the Somerset site led to ONR identifying the breaches and issuing four notices.

The enforcement notices require improvements to be made to address the shortfalls in compliance and prevent reoccurrence.

There were no consequences to employees, the public or the environment because of the shortfalls.

However, ONR identified the potential for harm and risk of serious injury, which required regulatory action.

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Shane Turner, superintending inspector and head of safety regulation at Hinkley Point C, said: “The enforcement notices require these four organisations to make improvements in fire safety arrangements at the Hinkley Point C site.

“We will engage with each of them during the period of the enforcement notice to ensure positive progress is made.”

The notices require that necessary improvements are made by 31st March 2024.

The enforcement action relates to contraventions under the requirements of Article 22 of the Regulatory Reform (Fire Safety) Order 2005.