Office for Nuclear Regulation

LC19 Oversight of site welding: Class 1/2 systems (WN3)

Executive summary

Purpose of Intervention

Licence condition (LC) compliance interventions are an essential element of the Office for Nuclear Regulation’s (ONR's) overall intervention strategy which consists of a series of interventions. Each intervention is intended to establish that the licensee has adequate arrangements in place for compliance with a licence condition. Inter alia, LC 19 requires that:

The aim of the intervention was to gain confidence that the licensee had adequate arrangements in place for compliance with LC 19, in relation to the welding of class 1/2 components at Hinkley Point C (HPC). While this was the main focus of the intervention, given observations on possible exposure to welding fume from previous inspections, I also made checks on those aspects of the welding.

Interventions carried out by ONR

The intervention comprised a launch meeting to agree on the approach, a site visit to gather evidence on the effectiveness of the licensee's arrangements for site welding and a close out meeting. During the intervention, ONR asked for and the licensee supplied documents which ONR checked against its expectations for site welding.

Key findings, inspector’s opinions and reasons for judgements made

My findings on the main aim of the intervention, to gain confidence that the licensee had adequate arrangements in place for compliance with LC 19, in relation to the welding of class 1/2 components at HPC are:

My conventional safety findings are:

Conclusion of intervention

Overall, the conclusion of the intervention is that the licensee demonstrated adequate arrangements for compliance with LC 19, in relation to the welding of class 1/2 components at Hinkley Point C, with only minor areas for improvement identified. An inspection rating of Green is appropriate for LC 19 (Construction or installation of new plant).