Office for Nuclear Regulation

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Sizewell A - Ponds System Inspection

Executive summary

Purpose of intervention

The Office for Nuclear Regulation (ONR) undertakes all regulatory interactions with the Sizewell A (SZA) site licensee, Magnox Limited, against an inspection schedule defined by ONR's Sellafield, Decommissioning, Fuels and Waste Programme.

In accordance with the Sizewell A integrated inspection schedule, a system based inspection (SBI) of System S3.3, Ponds and effluent control Systems was planned and undertaken in July 2016. The purpose of this inspection is for ONR to examine whether the licensee's safety case claims in respect of this system important to safety have been adequately implemented. The intervention was carried out as a joint inspection with the Environment Agency to provide a more efficient and effective means of regulation of this area.

Interventions Carried Out by ONR

I carried out a systems inspection of S3.3, Ponds and effluent control Systems. The SBI is undertaken against the following Licence Conditions (LCs):

In addition to the planned inspections I also attended number of meetings. These included the following topics:

Explanation of Judgement if Safety System Not Judged to be Adequate


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

The Systems inspection of S3.3, Ponds and effluent control Systems showed that the plant was being adequately operated and maintained in accordance with the licensees' arrangements and meets the requirements of the safety case.

For each of the licence conditions inspected I concluded that:

Overall, I concluded that the arrangements and their implementation on the Pond systems from an operational and civil engineering perspective met the requirements of the safety case and judged these to be adequate through the course of the inspection.

In addition to the planned systems inspection I also attended number of meetings with the licensee as identified in section 1.2. details of these meetings are recorded in the main body of the report, but no safety concerns were identified:

Conclusion of Intervention

Overall I judged that the systems adequately meets their safety case functions and are being adequately operated in accordance with the safety case. I found no issues that significantly affect safety, or that required further regulatory intervention.

Based on the inspection findings I judged that an inspection rating of GREEN (adequate) was appropriate for the SBI for System S3.3, Ponds and effluent control Systems system and for each of the relevant Licence conditions covered.