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.

Compliance inspections at Hunterston B power station

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake Licence Condition (LC) compliance inspections at EDF Energy Nuclear Generation Ltd's (NGL's) Hunterston B power station, in line with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy (IIS) for 2016/17.

Interventions Carried Out by ONR

This intervention included compliance inspections against the following Licence Conditions:

I also attended the quarterly Hunterston site stakeholder group meeting during which I presented the ONR report detailing regulatory activities at Hunterston B between 1st April and 30th June 2016.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable as no system inspection was undertaken during this intervention.

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

In relation to configuration control of plant being modified, we noted sufficient checks and balances within the procedures, electronic modification form and Asset Management System to allow for adequate configuration control.

We sampled how open modifications on the station are controlled and made the following observations:

The sampled list of safety case anomalies showed that there was a limited number of Interim Justification for continued operation (IJCO) documents which were regularly monitored for progress. On this basis we considered that there was adequate control of safety case anomalies.

The sampled list of fuel route interlock defeats demonstrated that defeat of interlocks was under control, however there were some which had been long standing and which could have been subject to Engineering Change.

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

In relation to LC 22, I considered that an ONR inspection rating of ‘Green' is warranted on the basis that the station is demonstrably compliant with its arrangements under LC 22.

There are no findings from this inspection that could significantly undermine nuclear safety.