The company building Hinkley Point C, the new nuclear power station in Somerset, has “deficiencies” in its supply chain arrangements and quality assurance, and must make improvements, according to the Office for Nuclear Regulation (ONR).

The regulator gave an “amber” rating to Hinkley Point C’s supply chain arrangements, saying that NNB GenCo, the delivery company for the EDF/CGN-owned plant, “has to consider the effectiveness of its current project assurance arrangements and identify areas for improvement”.