Hunterston B - SBI08 and 09
- Site: Hunterston B
- IR number: 16-262
- Date: March 2017
- LC numbers: 10, 23, 24, 27, 28, 34
Purpose of intervention
This was a planned inspection of EDF Energy Nuclear Generation Ltd's (NGL's) Hunterston B power station, undertaken as part of the planned intervention strategy for the Operating Facilities Programme (OFP) of the Office for Nuclear Regulation (ONR).
The work was carried out in-line with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy (IIS).
Interventions Carried Out by ONR
During this intervention, the following key activity was undertaken:
- System based inspection (SBI) of the Short Break Supplies and Grid Systems.
Explanation of Judgement if Safety System Not Judged to be Adequate
From our inspection, ONR judged that the Short Break Supplies and Grid Systems met the requirements of the safety case and was adequate.
Key Findings, Inspector's Opinions and Reasons for Judgements Made
From the System Based Inspection on the Short Break Supplies and Grid Systems ONR concluded that:
- LC 10 (Training) - ONR examined the training records of a number of personnel involved in maintenance and inspection activities associated with the Short Break Supplies and Grid Systems. ONR judged that the personnel undertaking these maintenance and inspection activities were suitably qualified and experienced. ONR therefore assigned a rating of Green (no formal action) for LC 10 compliance.
- LC 23 (Operating Rules) - The Technical Specifications inspected adequately specified the limits and conditions of operation (LCO) reflecting those specified in the safety case. In addition the surveillance records and compliance check sheets inspected demonstrated that the Technical Specifications were complied with during operations. ONR therefore assigned a rating of Green (no formal action) for LC 23.
- LC 24 (Operating Instructions) - ONR examined a sample consisting of a station operating instruction (SOI) and several maintenance instructions (MIs). ONR judged these documents to be of an adequate standard and therefore assigned a rating of Green (no formal action) for LC 24.
- LC 27 (Safety Mechanisms, Devices and Circuits) - The Short Break Supplies and Grid Systems were considered as safety related systems. ONR examined several completed maintenance and test records relating to these systems and confirmed that they were adequately maintained and tested on a regular basis. ONR judged that a rating of Green (no formal action) was appropriate for LC 27.
- LC 28 (Examination, Inspection, Maintenance and Testing) - ONR examined several maintenance instructions and work order cards. ONR confirmed that the periodicity of maintenance activities was appropriate and the maintenance instructions appropriately completed. ONR judged that the Short Break Supplies and Grid Systems plant and equipment was being adequately maintained. We therefore assigned an IIS rating of Green (no formal action) for LC 28.
- LC 34 (Leakage and Escape of Radioactive Material and Radioactive Waste) - The Short Break Supplies and Grid Systems do not contain radioactive material and therefore LC34 was not considered as part of this inspection.
The intervention was performed in line with ONR's guidance requirements (as described in our technical inspection guides) in the areas inspected.
Conclusion of Intervention
From the evidence sampled during this SBI-08/09 inspection against LCs 10, 23, 24 and 28, ONR consider that the Short Break Supplies and Grid Systems met the requirements of the safety case.
There are no findings from this inspection that could significantly undermine nuclear safety. At present, no additional regulatory action is needed over and above the planned interventions at Hunterston B Power Station as set out in the Integrated Intervention Strategy, which will continue as planned.