Office for Nuclear Regulation

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LC 35 Inspection - Sellafield Remediation; Thorp Mini Pilot Plant (TMPP) at Sellafield

Executive summary

Purpose of Intervention

The Office for Nuclear Regulation (ONR) undertakes all regulatory interactions with Sellafield Limited (SL), the site licensee, against a strategy defined by the ONR Sellafield Programme. The planned inspection schedule for the current regulatory year (covering April 2017 - March 2018), the content of which is guided by that strategy, identifies the Licence Conditions (LCs) that will be inspected over this period.

Licence Condition 35 (LC35, Decommissioning) requires the licensee to make and implement adequate arrangements for the decommissioning of any plant or process which may affect safety. This planned intervention was undertaken to determine if Remediation is adequately implementing SL's site-wide arrangements for compliance with LC35 in the Thorp Mini Pilot Plant (TMPP).

Interventions Carried Out by ONR

LC35 requires the licensee to make and implement adequate arrangements for the decommissioning of any plant or process which may affect safety. The inspection comprised discussions with SL personnel and reviews of SL documents, focussed on the following areas:

Explanation of Judgement if Safety System Not Judged to be Adequate

Not applicable; this was not a Safety System inspection.

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

I consider that Remediation's implementation of the site's LC35 arrangements for TMPP is adequate. For example, there was evidence of the derivation of the decommissioning strategy for TMPP from the NDA's Site Strategic Specification (SSS) for SL through the Sellafield Decommissioning Strategy (SDS) to the facility-specific decommissioning plan. This is, however, offset by minor shortcomings identified, in relation to the decommissioning plan, asbestos management and decommissioning facilities register. For these reasons, on balance, I consider a rating of GREEN (No formal action) is merited against LC 35 as a result of this inspection.

Conclusion of Intervention

My findings were shared with, and accepted by, the licensee as part of normal inspection feedback. I have raised three Level 4 Regulatory Issues as a result of this inspection to address the shortfalls I identified.