Hunterston B - Planned inspections
- Site: Hunterston B
- IR number: 17-062
- Date: July 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 Division (OFD) of the Office for Nuclear Regulation (ONR).
The work was carried out in accord with the planned inspection programme contained in the Hunterston B Integrated Intervention Strategy (IIS).
Interventions Carried Out by ONR
We performed a system based inspection (SBI) to confirm the implementation of safety claims made against the Station’s emergency equipment. This inspection was undertaken by the ONR site inspector, with technical support provided by an internal hazards specialist. During this intervention we examined the Licensee’s compliance with the following licence conditions (LCs):
- LC10 – Training
- LC23 – Operating Rules
- LC24 – Operating Instructions
- LC28 – Examination, inspection, maintenance, and testing.
LC 34 (leakage and escape of radioactive materials) was not included in the SBI as we judged that it was not applicable to this system. Compliance with LC 27 was also not included as we did not consider that the emergency equipment sampled meets the definition of safety mechanisms devices and circuits (SMDC) contained within NS-INSP-GD-027.
The intervention was performed in line with ONR’s guidance requirements (as described in our technical inspection guides) in the areas inspected.
Explanation of Judgement if Safety System Not Judged to be Adequate
From the inspection, ONR judged that the emergency equipment met the requirements of the safety case.
Key Findings, Inspector's Opinions and Reasons for Judgements Made
- Licence Condition 10 (Training) – We examined the training programme for members of the incident response team and considered the training to be appropriate. NGL provided records, via a computer database to demonstrate that staff training was up to date. We judged that the personnel undertaking the activities were suitably qualified and experienced. We therefore assigned a rating of Green (no formal action) for LC 10 compliance.
- Licence Condition 23 (Operating Rules) – We examined the Station’s technical specifications relating to equipment provided for use in the event of an off-site nuclear emergency. Requirements for the availability of the principal items of emergency equipment were well defined. We therefore assigned a rating of Green (no formal action) for LC 23.
- Licence Condition 24 (Operating Instructions) – We sampled the emergency response procedures, noting that they are in a consistent format with other station operating instructions. These instructions were reference use instructions but written in a continuous use format. Considering that these instructions are to be utilised during an emergency we stated it was our expectation that they should be continuous use instructions. We judged these documents to be of an adequate standard and therefore assigned a rating of Green (no formal action) for LC 24.
- Licence Condition 28 (Examination, Inspection, Maintenance and Testing) – We examined maintenance records and instructions of emergency equipment and found these to be in good order and clear. Based on the sample we confirmed that maintenance was being carried out by suitably qualified and experienced persons with appropriate oversight for its safety significance. ONR judged that the emergency equipment was being suitably maintained, inspected and tested. We therefore assigned an IIS rating of Green (no formal action) for LC 28.
Conclusion of Intervention
From the evidence sampled during this SBI-10 inspection against LCs 10, 23, 24 and 28, we consider that the emergency equipment 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.