Office for Nuclear Regulation

Compliance inspection of Licence Condition 19 - Management of Large Pour Concrete Construction

Executive summary

Purpose of Intervention

In accordance with the Office for Nuclear Regulation’s (ONR’s) Hinkley Point C Construction Inspection Plan, ONR performs a series of planned compliance inspections of identified licence conditions, to ensure that NNB Generation Company (HPC) Ltd (NNB GenCo), is proportionately and adequately developing and implementing its licence compliance arrangements commensurate to the current stage of the project.

This intervention included a routine licence condition inspection carried out to assess NNB GenCo (HPC)’s compliance with licence condition 19; Construction or installation of new plant.

Interventions Carried Out by ONR

LC19 requires that “Where the licensee proposes to construct or install any new plant which may affect safety the licensee shall make and implement adequate arrangements to control the construction or installation.”
ONR carried out the following LC 19; Construction or installation of new plant inspections:

The following guidance was used in this intervention:

Additionally, this record captures the ONR engagement with NNB GenCo on the following:

Explanation of Judgement if Safety System Not Judged to be Adequate

N/A as this was not a safety systems inspection.

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

LC19 - Management of Concrete Construction

NNB GenCo management of concrete pours in conjunction with Bylor procedures was generally found to be adequate in accordance with the requirements of the BTS. From records ONR sampled, NNB GenCo surveillance team appear to have undertaken adequate surveillance and of the large pours to date. Surveillance records are now fully recorded on ‘Fieldview’ (electronic record keeping system).At present, NNB GenCo is performing 100% surveillance of 100% of large, nuclear safety related pours. Where RFIs, NCRs and FCRs are raised, these are communicated to the Site Engineering Team.

Conclusion of Intervention

LC19 - Management of Concrete Construction

I judge that overall an inspection rating of GREEN (No formal action) is appropriate for licence condition 19; Construction or installation of new plant in relation to the three ‘special’ large nuclear safety related concrete pours undertaken to date. This is because I found NNB GenCo to be compliant with its legal duties with only minor areas for potential further improvement. However, I have raised a level 4 regulatory issue to ensure key lessons learnt are captured in the concreting works procedures in a timely manner.