Office for Nuclear Regulation

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NNB GenCo - Compliance inspection of LCs 17, 19 and 20

Executive summary

Purpose of Intervention

The Marine Works Contract for HPC had originally been awarded to COSTAIN.  However, this contract had been terminated and the work novated to Balfour Beatty at the end of 2017. 

The purpose of this programmed ONR Intervention was to assess NNB GenCo’s compliance with the requirements of Site Licence Conditions 17, 19 and 20 as they applied to the nuclear safety related work being carried out by Balfour Beatty at their facility at Avonmouth Somerset.  The scope of work at Avonmouth covers the design and construction of four inlet and two outlet sea-bed head works structures and the manufacture of approximately forty thousand sea water tunnel lining segments.

Interventions Carried Out by ONR

The ONR Team carried out their intervention of NNB GenCo and Balfour Beatty on 11th and 12 December 2018 against the applicable parts of the relevant regulatory requirements and associated guides, e.g.:

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

Based on the presentations, observations, inspections and discussions over the course of the intervention I concluded that NNB GenCo had made an adequate transition of the Marine Works Contract from COSTAIN to Balfour Beatty.

Conclusion of Intervention

I further concluded that the Marine Works Project organisation, and the delivery arrangements developed and deployed, were adequate for the scope of work to being delivered in terms of ONR’s expectations set out in the applicable parts of the relevant regulatory requirements and associated guides, and that an Inspection Rating of Green was appropriate.