Office for Nuclear Regulation

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Planned inspection of Magnox Ltd's Harwell nuclear licensed site

Executive summary

Purpose of intervention

This report covers an inspection of Magnox Ltd’s Harwell nuclear licensed site between 25 – 28 January 2016. This inspection was undertaken as part of a programme of planned interventions as outlined in the IIS plan for 2015/16.

Interventions Carried Out by ONR

During this intervention, I carried out a system compliance inspection on containment employed in the Remote Handled Intermediate Level Waste process.

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

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.

Explanation of Judgement if Safety System Not Judged to be Adequate

The safety system inspected was judged to adequately meet the requirements of 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 compliance with LC10, 23, 24, 27, 28 and 34 in relation to containment employed in the Remote Handled Intermediate Level Waste process. My inspection concentrated on the B462 Head End Cell. I reviewed the licensee’s proposed re-baselined safety case and considered that it accurately represented the facility and identifies the associated hazards and risks. I judged that the safety case also identified appropriate key safety related equipment.

I reviewed the training records for staff operating the B462 Head End Cell and found that all such persons had current training records against all of the operating and maintenance instructions sampled during this inspection.

I found that the instructions that I reviewed were appropriate for the tasks being undertaken to operate and maintain the Head End Cell and were capable of being understood by a trained operator. I consider the use of annotated photographs in maintenance instructions is good practice.

Based on my inspection I consider that the licensee has demonstrated its arrangements to ensure that the plant is not operated, unless suitable and sufficient safety mechanisms, devices and circuits are properly connected and in good working order.

I found that the licensee is undertaking suitable examination, inspection, maintenance and testing activities for the B462 Head End Cell safety systems.  All maintenance records sampled were within date and legible.

I considered that the licensee’s radiological survey regime and ventilation system constitute adequate arrangements for the management of leakage and escape of radioactive materials from the HEC and therefore rate this licence condition as IIS 3.

Based on the evidence gathered during this inspection, I consider that the licensee has made and implemented its arrangements adequately to ensure the safety of the B462 Head End Cell.

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 conclude that there are no matters that may impact significantly on nuclear safety. However a number of improvements have been identified that the licensee has agreed to implement.