Office for Nuclear Regulation

This website uses non-intrusive cookies to improve your user experience. You can visit our cookie privacy page for more information.

Planned compliance inspection activities at Hinkley Point B

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake planned compliance inspection activities at EDF Nuclear Generation Limited’s (NGL’s) Hinkley Point B power station in line with the 2016/17 Hinkley Point B integrated intervention strategy (IIS).

Interventions Carried Out by ONR

Assisted by an ONR specialist (Chemistry) inspector, I performed a system based inspection (SBI) to confirm the implementation of safety claims made for the CO2 processing and blowdown system. I examined the Licence’s compliance with the following licence conditions (LCs):

In addition, I undertook the following interventions on the site:

Explanation of Judgement if Safety System Not Judged to be Adequate

On the basis of the evidence sampled during this inspection, I judged that the system meets the requirements of the safety case and is adequate, warranting an assessment rating of GREEN.

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

From an LC10 perspective, staff training records and profiles were judged to be in accordance with the requirements for the roles performed. The licensee demonstrated an effective knowledge and understanding in the areas of the safety case examined. I judged the LC10 element of this inspection to be adequate, warranting an assessment rating of GREEN.

From an LC23 and LC24 perspective, based on the evidence sampled during this inspection, the majority of technical specifications and station operating instructions were judged to be adequately aligned with claims presented within safety case. The sole exception to this was related to recombiner O2 injection, which I judge to be suitably covered by an existing ONR Issue. I therefore judged the LC23 and LC24 element of this inspection to be adequate, warranting an assessment rating of GREEN.

I found that NGL’s list of essential systems included the principal components sampled during this inspection. I considered the arrangements for LC27 to have been adequately implemented and warrant an assessment rating of GREEN.

I undertook a sample inspection of the examination, inspection, maintenance and testing regime of components important to nuclear safety. Overall, the maintenance regime was judged to be adequate. I consider that an assessment rating of GREEN appropriate against LC28.

From an LC34 perspective, I consider that review self-assessment of LC34 undertaken at Hinkley Point B to be an example of good practice in line with other stations, with identified areas for strengthening. I therefore judge an assessment rating of GREEN to be warranted.

The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.

Conclusion of Intervention

After considering the evidence examined during the inspections undertaken against LCs 10, 23, 24, 27 28, and 34, I considered that the CO2 Processing and Blowdown system meets the requirements of the safety case.

A number of minor observations and improvements were identified, which were fed back to the licensee. The licensee accepted ONR’s findings. A new level 4 ONR issue has been raised to capture and track progress against these actions.

There are no findings from this inspection that could significantly undermine nuclear safety and no change to the planned interventions and inspections of Hinkley Point B.