Office for Nuclear Regulation

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LC28 Improvement Notice Follow Up Reactive inspection at Heysham 1 Power Station

Executive summary

Purpose of intervention

The purpose of this intervention was to carry out a compliance inspection at EDF Energy Nuclear Generation Limited’s (NGL’s) Heysham 1 power station in line with the planned inspection programme contained in the Heysham 1 Integrated Intervention Strategy (IIS) for 2015/16. 

Interventions Carried Out by ONR

The ONR nominated site inspector and an ONR specialist inspector carried out a reactive Licence Condition (LC) 28 – examination, inspection, maintenance and testing intervention to review progress with the Improvement Notice served at Heysham 1 on the 25 March 2015 following an event which released approximately 30 Tonnes of Carbon Dioxide (CO2) from the East CO2 plant.

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable during this intervention.

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

EDF-NGL has undertaken a significant amount of work on the East CO2 plant following the event, however they recognised that they needed more time to record the rationale for the work undertaken and to ensure they had a comprehensive record of all the engineering judgements.  In light of this the station has subsequently requested a 2 month extension to the Improvement Notice which has been granted by ONR.  Consequently I have rated this intervention against LC28 as below standard with an IIS rating of 4. 

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

From the evidence gathered during this intervention, I do not consider there to be any matters that have the 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 set out in the Integrated Intervention Strategy, which will continue as planned.