Office for Nuclear Regulation

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Conduct of Inspection in support of IIS

Executive summary

Purpose of intervention

In line with the 2014/15 inspection plan for Dounreay I carried out planned inspections and other interventions to provide confidence that Dounreay Site Restoration Ltd. (DSRL) is controlling its hazards properly and complying with its statutory obligations.

Interventions Carried Out by ONR

I undertook compliance inspection against Licence Condition 23 Operating Rules, Licence Condition 24 Operating Instructions and Licence Condition 27 Safety Mechanisms, Devices and Circuits within the Waste Receipt, Assay and Conditioning facility (WRACs) and Licence Condition 28 Examination, Inspection, Maintenance and Testing and Licence Condition 34 Leak and Escape within the Liquor Storage facility.  I accompanied Specialist Inspectors on fact-finding interventions relating to the proposed Interim ILW Store, ADU Floc encapsulation and the Shaft and Silo Retrieval Project.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

My WRACs inspection focussed on the newly installed super-compactor which is under-going inactive commissioning.  I looked at draft operating instructions and discussed operating limits.  I was taken through how the plant would be operated and the safety mechanisms in place to ensure safe operation.  I was satisfied that an adequate standard of compliance was demonstrated against Licence Conditions 23, 24 and 27 for this phase of super-compactor operations.

I undertook an inspection of the Liquor Storage Facility to confirm implementation of maintenance and inspection arrangements to demonstrate that the liquor storage tanks remain fit for purpose.  My sampling of the maintenance schedule and inspection reports provided assurance of an adequate standard of compliance against Licence Conditions 28 and 34.

My intervention on the proposed Interim ILW Store confirmed my opinion of the need to assess the adequacy of the safety case to address potential package degradation due to environmental conditions; package inspection and contingency arrangements in the event that degradation occurs; and dose management controls.

Conclusion of Intervention

The intervention did not identify any matter impacting on nuclear safety that required immediate regulatory action.