Office for Nuclear Regulation

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Heysham 1 - LC7 and LC14 Compliance Inspections

Executive summary

Purpose of Intervention

The purpose of this intervention was to carry out licence condition compliance inspections at the EDF Energy Nuclear Generations Limited’s (NGL’s) Heysham 1 power station in line with the planned inspection programme.

Interventions Carried Out by ONR

The nominated site inspector and mechanical engineering inspector carried out planned licence condition (LC) compliance inspections against the following:

The nominated inspectors for Heysham 1 and 2 also undertook follow up enquires into an incident, which occurred on the 04 March, involving the unavailability of the West CO2 plant due to the lifting of a safety relief valve.

Explanation of Judgement if Safety System Not Judged to be Adequate

No safety system inspection was undertaken, hence this is no applicable.

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

LC7 - Incidents on the site

Prior to this inspection, I examined a sample of the licensee’s LC7 procedures against the relevant ONR guidance documents for this licence condition.

In order to judge the adequacy of implementation of these arrangements I sampled Condition Reports (CRs) covering:

The evidence provided aligned with internal arraignments and ONR expectations. I did not identify any significant shortfalls. I judged that these procedures satisfied the requirements of LC7 and have awarded an ONR rating of green.

LC14 - Safety documentation

Prior to this inspection, I examined a sample of the licensee’s LC14 procedures against the relevant ONR guidance documents for this licence condition. In order to judge the adequacy of implementation of these arrangements, I sampled the living safety case document covering the engineering change process. The engineering process sampled aligned with internal arrangements and ONR expectations. I did not identify any significant shortfalls. I judged that these procedures satisfied the requirements of LC14 and have awarded an ONR rating of green.

The site inspectors for Heysham 1 and 2 gathered information on the West CO2 plant incident from a number of station personnel involved with the incident.  The Licensee has completed its own Significant Adverse Condition Investigation (SACI) into the circumstances of the incident and identified a number of root and contributing causes.  The Station has also identified a number of corrective actions.  The initial regulatory focus has been on the Station’s compliance with Site Licence Conditions and Pressure System Safety Regulations.  ONR will consider the aspects of this incident in accordance with its enforcement policy to determine whether further investigation or enforcement action is warranted.

Conclusion of Intervention

From the evidence gathered during this intervention, I do not consider there to be any matters that have potential to impact significantly on nuclear safety

At present, no additional regulatory action is needed over and above the planned interventions of Heysham 1 power station as identified in the intervention strategy, which will continue as planned.