Office for Nuclear Regulation

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Solid Waste LC 26 27 & 28 Routine Compliance Inspection 04

Executive summary

Purpose of intervention

The purpose of this intervention was for the Office for Nuclear Regulation (ONR) to undertake a planned licence condition (LC) compliance inspection to assess Sellafield Ltds compliance with the following LCs within Waste Treatment Complex (WTC) 1 in accordance with the approved Sellafield intervention strategy. Whilst WTC is relatively low hazard/risk it is a key element in the sites hazard/risk reduction programme.

Interventions Carried Out by ONR

ONR carried out a planned one day planned team inspection of WTC 1 using several ONR specialist inspectors to assess compliance with LCs 26, 27 and 28.

Explanation of Judgement if Safety System Not Judged to be Adequate

n/a as this was not a safety system inspection.

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

Control and supervision at WTC1 appeared effective and was supported by an effective Integrated Work Management (IWM) process.

The IWM process has been successfully implemented in WTC1 and Sellafield Limited was asked to consider how the learning/good practice can be shared with other facilities on the site.

Sellafield Limiteds System Health process has been effectively implemented in WTC1 and is providing useful information to enable Sellafield Limited to improve plant reliability.

Sellafield Limited was able to demonstrate that the required maintenance for the key safety systems sampled during the inspection had been completed and steps were being taken to maximise the availability of nuclear safety related equipment.

ONR gave advice on improvements that could be made to the way that Sellafield Limited ensures the correctness of setting low flow alarm points on Alpha-in-air monitors.

Conclusion of Intervention

Overall I judge that WTC1 were able to demonstrate that the implementation of their arrangements for compliance with LC26 align closely with best practice - thereby deserving an IIS rating of 2 - Good.

The implementation of the arrangements for compliance with LC 27 and 28 based on the sampling undertaken was good thereby potentially deserving a rating of good for both LCs under inspection. However, during the inspection ONR gave advice on an area for improvement in the way Sellafield Limited test its alpha-air-monitors. Consequently, for LC27, based on the sampling undertaken, an IIS rating of 3 - adequate is considered appropriate.

Regarding LC28, strong evidence was provided, demonstrating good implementation of Sellafield Limiteds arrangements for compliance with LC28 and thereby deserving an IIS rating of 2 - good.