Office for Nuclear Regulation

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Magnox Ltd Harwell - System Based Inspection

Executive summary

Purpose of Intervention

This System Based Inspection on the Harwell Magnox Ltd. licensed nuclear site was undertaken as part of a programme of planned interventions as outlined in the Magnox southern sites' inspection plan for 2017/18.

Interventions Carried Out by ONR

During this intervention, I carried out a System Based Inspection on the B462 Retrieval Machine 2 interlock systems to ensure adequate implementation of the following licence conditions:

Whilst on site I held meetings with the licensee to discuss and follow up on the status of actions and held meetings to discuss a number of routine matters.

My inspections were carried out against the requirements of ONR's published inspection guidance associated with the above Licence Conditions for System Based Inspections. The inspection comprised plant inspection, office-based examination of procedures and records and interviews with staff.

Explanation of Judgement if Safety System Not Judged to be Adequate

My inspection found that the interlock systems employed in the B462 Retrieval Machine 2 fulfils its safety function and adequately implements the safety case.

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

I carried out a System Based Inspection to assess the licensee's implementation of LC10, 23, 24, 27 and 28 in relation to the B462 Retrieval Machine 2 interlock systems. During this inspection, I reviewed the licensee's safety case and considered that it accurately represented the facility and identifies the associated hazards and risks. In my opinion the safety case also identified appropriate safety related equipment.

I reviewed the training records for a sample of operational and maintenance staff. I found that all such persons had current training records against all of the operating and maintenance instructions sampled during this inspection.

I reviewed the operating and maintenance instructions. I found that the operating and maintenance instructions that I reviewed were clear and concise and clearly identified references to the safety related equipment.

I found that the licensee is undertaking suitable examination, inspection, maintenance and testing activities for the B462 Retrieval Machine 2 interlock systems. All maintenance records sampled were within date and legible. The licensee also demonstrated that the plant was not operated, unless suitable and sufficient safety mechanisms, devices and circuits are properly connected and in good working order.

Based on the evidence gathered during this system based inspection, I consider that the licensee has made and implemented its arrangements adequately to ensure the safety of the B462 Retrieval Machine 2 interlock systems.

Conclusion of Intervention

From the evidence gathered during this intervention, I conclude that there are no matters that may impact significantly on nuclear safety.