Office for Nuclear Regulation

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Heysham 2 - Organisational Learning Thematic Inspection

Executive summary

Purpose of Intervention

The purpose of this intervention was to undertake compliance inspection activities at EDF Energy Nuclear Generation Limited's (NGL's) Heysham 2 power station in line with the ONR's planned inspection programme contained in the Heysham 2 Integrated Intervention Strategy (IIS) for 2017/18.

The intervention was carried out by the ONR site inspector, supported by five ONR specialist inspectors.

Interventions Carried Out by ONR

We performed a themed inspection on the topic of Organisational Learning (OL). This included a licence compliance inspection of NGL's arrangements for Licence Condition (LC) 7 (incidents on the site).

In particular we inspected the specific organisational learning arrangements within chemistry operations to detect deviations in chemistry, including the subsequent investigations and learning implementation.

We also sampled chemistry station safety case documentation and chemistry control compliance within the primary circuit, Pressure Vessel Cooling Water (PVCW) system and circulating auxiliary cooling (CAC) water system, however did not formally rate this aspect of the inspection.

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

Explanation of Judgement if Safety System Not Judged to be Adequate


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

During the inspection we examined the arrangements in place at Heysham 2 to investigate incidents and implement the necessary improvements. We interviewed a wide range of staff at various levels within the organisation this also included observing a number of shift handovers. We noted good evidence of staff engagement in the use of OL and OPEX.

The station presented evidence to show how it was managing and making improvements to its Performance Improvement Programme (PI) which has undergone recent enhancement. Based on our sample of interviews and observations we judged that there are effective processes in place to manage and monitor the implementation of actions identified. There were no issues raised during the inspection.

In respect to the chemistry specific aspects of OL and LC7, we were satisfied NGL demonstrated appropriate arrangements for the detection, investigation and implementation of learning within chemistry. HYB are appropriately implementing OPEX from the rest of the fleet and other worldwide forums.

Overall, we judge the LC7 aspect of the inspection to be adequate, warranting an IIS rating of GREEN.

Conclusion of Intervention

There are no findings from this inspection that could significantly undermine nuclear safety and no change is necessary to the planned interventions and inspections at Heysham 2 as a result.