Office for Nuclear Regulation

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Sizewell B - Licence Condition 7 inspection

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) Sizewell B power station, in line with the planned inspection programme of the Operating Facilities Operating Reactors sub-programme intervention plan for 2017/18.

Interventions Carried Out by ONR

During this intervention, we undertook a themed inspection on Organisational Learning, during which we measured compliance against the following Licence Condition:

Also during this intervention I:

Explanation of Judgement if Safety System Not Judged to be Adequate

No system inspection was undertaken during this intervention.

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

This inspection was the third in a series of themed inspections intended to evaluate the effectiveness of NGL’s organisational learning across the operational reactor fleet.. This intervention evaluates how well each station learns lessons from internal and external sources in order to continuously improve leadership, organisational capability, safety decision making and safety performance

During the inspection, the following themes were examined:

A number of positive areas were noted that will be reviewed following completion of ONR’s Fleet-wide Organisational Learning themed interventions when they may be identified as good practices:

There were several areas in which we noted required further work but did not merit raising a regulatory issue:

One regulatory issue has been raised at Level 4 through which to monitor improvements in timeliness and quality of investigations and action-close out.      Timeliness of investigation and CAP action close-out and Quality of CAP actions continues to be a challenge at Sizewell B (outwith the timescales set out within company LC 7 compliance arrangements).

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 summary, we found that the station has made considerable efforts to respond to the 2015 OSART findings, specifically the need for more consistent and visible consideration for extent of condition in investigations.  A number of good practices were found that will be disseminated by the ONR Corporate Inspector as part of the fleet wide theme inspection (listed below). One Level 4 regulatory issue has been raised through which the station’s progress towards improving quality and timeliness of investigations and action close-out. Suggested areas for improvement relating to benchmarking, use of the organisational learning portal and consistency in trending have also been made which will not be subject to specific regulatory follow-up.

I consider that, based on the evidence acquired during this intervention, that an inspection rating of Green is appropriate for LC 7 (Incidents on the site).