Office for Nuclear Regulation

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Hinkley Point C - LC 5 and LC 32 Inspections

Executive summary

Purpose of intervention

Interventions Carried Out by ONR

The purpose of the intervention was to:

The inspection comprised an on-site visit to the Ground Water Treatment Plant (GWTP), the dewatering ring-main and bore-hole monitoring system; this was followed up with discussion sessions with relevant NNB GenCo personnel and members of its main contractor team.

Explanation of Judgement if Safety System Not Judged to be Adequate

No system based inspection was undertaken during this visit so this section is not applicable.

Key Findings, Inspector's Opinions and Reasons for Judgements Made

The LC5 inspection focused on the License’s arrangements to appropriately record all nuclear matter consigned from the site.  

All the documents and procedures discussed during the meetings have now been provided in their final version. The arrangements are consistent with those presented by NNB GenCo during the intervention.  NNB GenCo provided an outline of the internal controls in place, including a dewatering hold point review group to confirm all requirements have been adequately addressed prior to the release of the hold point to commence de-watering.

The proposed recording arrangements and the associated control of contractors were sampled and deemed appropriate. Retention schedules for the nuclear matter consignment records meet the expectations of LC5(3).  An inspection rating of green was therefore considered appropriate.  

From an LC32 perspective, there is no radioactive waste currently on the site.  NNB have a borehole monitoring system and sampling regime which would detect any tritium movement onto the HPC site.  In addition, NNB GenCo have defined arrangements for the control and management of contaminated land and groundwater (NNB-306-PRO-000036, version 2.0) which have been recently reviewed and updated to support the dewatering operations.  

Based on the evidence sampled we consider that compliance with LC32 is adequate and that a rating of green is appropriate.

Conclusion of Intervention

From the evidence obtained during this intervention, the arrangements for compliance with LC5 and LC32 were judged to be adequate.  No additional regulatory action is needed over and above the currently planned interventions at Hinkley Point C.