Office for Nuclear Regulation

Heysham 1 and 2 – Inspection ID: 22-047

  • Site: Heysham 1 and 2
  • IR number: 22-047
  • Date: June 2022
  • LC numbers: 11

Executive summary

Purpose of Intervention

This was a planned compliance inspection of EDF Energy Nuclear Generation Ltd.’s (NGL’s) Heysham 1 and Heysham 2 power stations, undertaken as part of the planned intervention strategy for the Operating Facilities Division (OFD) of the Office for Nuclear Regulation (ONR).

The work was carried out in accordance with the planned inspection programme contained in the Heysham 1 and Heysham 2 Integrated Intervention Strategies (IIS) for 2022/23.

A ‘Level 1’ exercise (HERCULES) scenario had been agreed in advance, which introduced security and safety challenges at both Heysham 1 and Heysham 2.  Security related aspects of exercise HERCULES are reported separately.

The purpose of this intervention was to inspect the adequacy of Heysham 1 and Heysham 2’s arrangements to respond to the safety challenges presented by exercise HERCULES.

Interventions Carried Out by ONR

A team of ONR inspectors examined the licensee’s implementation of its arrangements which are necessary to demonstrate compliance with Licence Condition 11 (LC 11) ‘Emergency Arrangements’.

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

Not applicable.

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

We considered that this exercise provided sufficient challenge to test the implementation of emergency arrangements at both stations.  The scenario was suitably challenging because of the combined security and safety challenges.  Additionally, the joint site scenario required both sites to respond in a coordinated manner. We considered that both stations performed well during the demonstration.

A strong focus on nuclear safety and security was observed throughout the demonstration.  There was effective communication between the numerous key roles across both sites, leading to a common picture and understanding of the developing situation.

A small number of observations, where the implementation of emergency arrangements could be enhanced and improved, were identified for consideration by the stations.

Conclusion of Intervention

Based on our observation of the joint station level 1 emergency exercise demonstration we have assigned an intervention rating of Green for LC11 compliance.