Hinkley Point B - Planned Inspection - SBI06
- Site: Hinkley Point B
- IR number: 17-057
- Date: June 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) Hinkley Point B Power Station, undertaken as part of the planned intervention strategy for the Operating Facilities Division (OFD) of the Office for Nuclear Regulation (ONR).
The work was carried out in-line with the planned inspection programme contained in the Hinkley Point B Integrated Intervention Strategy (IIS).
Interventions Carried Out by ONR
During this intervention, the following key activities were undertaken:
- System based inspection (SBI) of the Emergency Generation System.
- Management of Ageing Electrical Cables
Explanation of Judgement if Safety System Not Judged to be Adequate
From the inspection, ONR judged that the Emergency Generation System met the requirements of the safety case and was adequate.
From the inspection I judged that the implementation of the arrangements related to the condition monitoring of electrical cables was adequate.
Key Findings, Inspector's Opinions and Reasons for Judgements Made
From the System Based Inspection on the Emergency Generation System, ONR concluded that:
- LC 10 (Training) – ONR examined the training records of a number of personnel involved in the management, maintenance and inspection activities associated with the Emergency Generation System. ONR judged that the personnel undertaking the 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 and reflected those specified in the safety case. It was evident from the surveillance records and compliance check sheets inspected 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 plant item operating instruction (PIOI) 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 Emergency Generation System was considered as a safety related system. 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 were appropriately completed. ONR judged that the Emergency Generation System 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 Emergency Generation System does not contain radioactive material. However and in accordance with ONR guidance ONR-INSP-GD-059 Guidance for Intervention Planning and Reporting, whilst this licence condition refers to radioactive material, there was flammable material associated with this system. From the sample inspected, it was evident that it did not present an unacceptable internal hazard to the system under inspection or other safety related plant. ONR judged that a rating of Green (no formal action) was appropriate for LC 34.
From the inspection on the implementation of the arrangements related to the condition monitoring of electrical cables, I was satisfied with the discussions and explanations given and judge that there was no need for regulatory action on this occasion.
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-06 inspection against LCs 10, 23, 24, 27, 28 and 34, ONR consider that the Emergency Generation System met the requirements of the safety case.
From the discussions, explanations and demonstrations held during this inspection, I consider the implementation of the arrangements in relation to the condition monitoring of electrical cables to be adequate.
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 Hinkley Point B Power Station as set out in the Integrated Intervention Strategy, which will continue as planned.