Office for Nuclear Regulation

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System and Compliance Inspection Emergency Demonstration Exercise

Executive summary

Purpose of intervention

This report covers an inspection of Magnox Ltd's Harwell nuclear licensed site between 21 - 25 November 2016. This inspection was undertaken as part of a programme of planned interventions as outlined in the IIS plan for 2016/17.

Interventions Carried Out by ONR

During this intervention, I carried out a system compliance inspection on the contact handled intermediate level waste process ventilation systems. This inspection was carried out against the following licence conditions:

In addition, I was joined by specialist ONR inspectors to carry out compliance inspections against 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. 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 ventilation systems employed in the contact handled intermediate level waste process 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 compliance with LC10, 23, 24, 27, 28 and 34 in relation to the contact handled intermediate level waste process ventilation 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. I judged that the safety case also identified appropriate safety related equipment.

I reviewed the training records for 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.

Whilst I found that the operating and maintenance instructions that I reviewed were clear and concise, I identified one plant which is in operational use, had no current operating instruction. The licensee has withdrawn this plant from use until this omission is rectified.

I found that the licensee is undertaking suitable examination, inspection, maintenance and testing activities for the contact handled intermediate level waste process ventilation systems. All maintenance records sampled were within date and legible. The licensee also has demonstrated its arrangements to ensure that a 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's radiological survey regime and ventilation system inspection and testing regime constitute adequate arrangements for the management of leakage and escape of radioactive materials from this safety system.

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 contact handled intermediate level waste process ventilation systems.

In regard to LC7, ONR considered that the licensee's arrangements and implementation generally met the requirements as defined in ONR guidance and broadly demonstrated relevant good practice in the majority of key operational experience requirements. I was also satisfied that the licensee's arrangements were adequately implemented on site.

In regard to LC11, the licensee undertook an emergency demonstration exercise. ONR considered that the planning for the exercise was sufficient, and that the scenario was proportionate to the hazards remaining on site whilst remaining challenging of the emergency arrangements. During the emergency demonstration exercise, ONR identified a number of good points and a number of significant areas for improvement. The licensee has undertaken to consider the lessons learnt from this exercise and to repeat the exercise within three months.

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.