Hinkley Point 'B' Power Station - Planned Inspections
- Site: Hinkley Point B
- IR number: 14-118
- Date: August 2014
- LC numbers: 30, 32, 34
Purpose of intervention
This was a planned inspection at EDF Energy Nuclear Generation Ltd.'s (NGL's) Hinkley Point B power station, undertaken as part of the planned intervention strategy for the Civil Nuclear Reactor Programme (CNRP) 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
The ONR internal hazards inspector and I (the nominated site inspector) carried out a system based inspection of fire protection systems (both passive and active systems). The ONR Structural Integrity Inspector, the ONR Control & Instrumentation Inspector and I attended the outage intentions meeting (LC30: periodic shutdown). I carried out a compliance inspection with the nominated Environment Agency inspector on LC32 (accumulation of radioactive waste) and LC34 (leakage and escape of radioactive material and radioactive waste). I also participated in the visit of the Site Stakeholder Group to the stations, discussed conventional safety matters on the site, met with the internal regulator and held information gathering meetings with NGL.
The licence conditions were inspected against ONR's published guidance requirements (as described in our technical inspection guides).
Explanation of Judgement if Safety System Not Judged to be Adequate
The Fire Detection, Suppression, Barriers, Doors and Dampers were judged to meet the requirements of the safety case and were adequate.
Key Findings, Inspector's Opinions and Reasons for Judgements Made
The ONR internal hazards inspector and I carried out a system based inspection of fire protections systems (both active and passive) at Hinkley Point B power station and concluded that:
- For LC10 (training): we reviewed the training pack developed to increase operator awareness of the fire protection systems. We also looked at the evidence of training of external staff carrying out operations on the site. Overall, we concluded adequate arrangements for ensuring training of suitably trained personnel for inspecting and maintaining these systems were in place and we assigned an IIS rating of - 3 (adequate) to this inspection.
- For LC23 (operating rules): we examined the Technical Specifications related to fire protection systems and concluded that satisfactory arrangements were in place. We assigned an IIS rating of - 3 (adequate) to this inspection.
- For LC24 (operating instructions): we reviewed a Station Operating Instruction which supported the Technical Specifications relating to the fire protection systems. We considered that the application of "compensatory measures" that can be used if a system is taken out of service could be clarified. Overall we were satisfied that adequate arrangements were in place and that site was improving its documentation in line with corporate guidance. We therefore assigned an IIS Rating of - 3, (adequate) to this inspection.
- For LC27 (safety mechanisms, devices and circuits): we were satisfied that the fire systems were being appropriately addressed as safety mechanisms. We therefore assigned an IIS rating of - 3 (adequate) to this inspection.
- For LC28 (examination, inspection, maintenance and testing): we noted the good condition of the fire protection plant and the progress that is being made on delivering enhancements and upgrades to the fire protection plant. We were satisfied that arrangements were in place to ensure that maintenance was carried out and we therefore assigned an IIS rating of - 3 (adequate) to this inspection.
- For LC34 (leakage and escape of radioactive material and radioactive waste): we noted successful commissioning trials of new fire protection systems, and the arrangements that were in place to ensure no leakage or escape of radioactivity. We therefore assigned an IIS rating of - 3 (adequate) to this inspection.
The ONR Structural Integrity Inspector, the ONR Control & Instrumentation Inspector and I attended the outage intentions meeting. For LC30 (periodic shutdown) we considered this to be a very useful meeting that provided significant detail on NGL plans for the outage and an opportunity for the site internal regulator, the Environment Agency and ONR to provide comment and challenge. We were satisfied that arrangements were in place to demonstrate compliance with LC30 and therefore assigned an IIS rating of - 2 (good) to this inspection.
The nominated Environment Agency inspector and I carried out an inspection of waste management procedures on the site:
- For LC32 (accumulation of radioactive waste): we judged that station was following its procedures and that it had satisfactory arrangements in place. We noted that station had maintained its LLW inventory at the target level, and that enhancement had been made to the waste processing facility and working practices. We therefore assigned an IIS Rating of - 3 (adequate) to this inspection.
- For LC34 (leakage and escape of radioactive material and radioactive waste): we were satisfied with the progress that had been made with the site approach and the improved use of leak management tools. We judged that further enhancement of the site arrangements with regard to LC34 arrangements could be made and we will continue to interact with site on this matter. Overall we were of the view that adequate arrangements had been demonstrated and we therefore assigned an IIS rating of - 3 (adequate) to this inspection.
I discussed industrial safety matters on the site and met with the site internal regulator to discuss recent events, ongoing inspections and future intervention topics. I participated in the Site Stakeholder Group visit to sites and held information gathering meetings with station staff on a range of topics including the recent failure of a section of Nitrogen pipework, the revision of Technical Specification 6.1.1 relating to the kerosene storage tanks, permissioning of the new Nitrogen system, the proposed extension to the Reactor 4 operating period and the new vaporiser auxiliary boiler plant.
Conclusion of Intervention
There are no findings from this inspection that could significantly undermine nuclear safety. No actions were raised during this inspection.