The purpose of this intervention was to undertake Licence Condition (LC) compliance inspections at Heysham 1 power station in line with the planned inspection programme contained in the Heysham 1 Integrated Intervention Strategy (IIS). The Intervention involved sampling into the Auxiliary Cooling Systems at Heysham 1. The Licence Conditions applied for this system based inspection were:
As the Nominated Site Inspector for Heysham 1, I inspected several areas of the power stations’ Auxiliary Cooling Systems accompanied by two Specialist Mechanical Safety Inspectors. I selected the following systems as my sample for inspection:
My inspection was described in an Agenda which was shared with the Licensee prior to my inspection [TRIM 2018/339157]
I performed a desktop review of the Licensee’s arrangements and associated documentation for the six License Conditions. I also performed a plant walk-down and had discussions with various System Engineers, Nuclear Safety Group personnel, and operators.
Heysham 1 nuclear power station demonstrated that it has arrangements in place to ensure that the Auxiliary Cooling System is inspected, maintained and operated in accordance with its safety case. The arrangements sampled and examined by ONR complied with Nuclear Generation Limited’s (NGLs) legal duties in the areas sampled during the inspection, and I was satisfied that the System adequately fulfils the requirements of the safety case.
I judge that the Licensee has adequate arrangements in place for training. Some individuals I sampled, although appropriately trained for the tasks undertaken, had not yet updated their training records to reflect this. I have raised this observation with the site, but do not consider it to be detrimental to nuclear safety.
I judge that the Licensee has an adequate process in place for identifying the operating rules to demonstrate the safety of an operation, ensuring configuration control and ensuring compliance with operating rules.
I judge that the Licensee had an adequate process in place for the production and implementation of Operating Instructions, and the management of Safety Mechanisms, Devices and Circuits.
I judge that the Licensee had adequate arrangements for the regular and systematic examination, inspection, maintenance and testing of all plant which may affect safety.
I judge that the Licensee had adequate arrangements in place for monitoring of leakage and escape of radioactive material and radioactive waste.
After examining the evidence sampled against LCs 10, 23, 24, 27, 28 and 34 during my inspection, performing a walk-down, and having discussions with various System Engineers, Training Group personnel and Nuclear Safety Group personnel, I judge that the Auxiliary Cooling System (System 4) met the requirements of the safety case and therefore an overall rating of Green (No Formal Action) is appropriate for this Inspection.
Several minor findings were identified during the inspection. These were communicated to the licensee during the inspection, and reiterated during the closing meeting held at the conclusion of the intervention. It was agreed the minor findings would be reviewed and followed to conclusion by the licensee’s Internal Regulator in liaison with the ONR Nominated Site Inspector.
From the evidence gathered during this intervention, I do not consider there to be any matters that have potential to impact significantly on nuclear safety. No additional regulatory action is needed over and above the planned interventions of Heysham 1 power station as identified in the intervention strategy, which will continue as planned.