Hinkley Point B - Planned intervention
- Site: Hinkley Point B
- IR number: 13-017
- Date: March 2014
- LC numbers: 12, 23, 24, 27, 28, 34
Purpose of intervention
The purpose of this intervention was to conduct a system inspection of the Decay Store at Hinkley Point B power station and to exchange information with site personnel.
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 following interventions were carried out:
The ONR specialist fuels inspector and I carried out an inspection of the Decay Store. This was based on sampling of the compliance arrangements that were in place, safety case requirements, operational limits, plant & training records, operational experience and a plant inspection. The intervention considered Licence Condition 12 (duly authorised and other suitably qualified and experienced persons), 23 (operating rules), 24 (operating instructions), 27 (safety mechanisms, devices and circuits), 28 (examination, inspection, maintenance and testing) and 34 (leakage and escape of radioactive material and radioactive waste).
I held a series of information exchange meetings with site personnel.
Explanation of judgement if safety system not judged to be adequate.
The safety system (Decay Store) was judged to meet the requirements of the safety case and was adequate.
Key findings, Inspector's opinions and reasons for judgements made
The ONR specialist fuels inspector and I carried out a system inspection on the Decay Store and concluded that:
- For LC12 (suitably qualified and experienced persons): we were satisfied that activities were effectively controlled such that work on site was carried out by suitably qualified and experienced persons. We concluded that the licensee had a structured, in depth and well controlled training and mentoring programme for its staff, which was subject to periodic review and improvement. We assigned an IIS rating of - 2 (good) to this inspection.
- For LC23 (operating rules) we concluded that there was adequate evidence to support the underpinning of the operating rules for the Decay Store and that compliance with the operating rules was demonstrated. We assigned an IIS rating of - 3 (adequate) to this inspection.
- For LC24 (operating instructions): we concluded that there was adequate evidence that operating instructions were in place to control operations at the Decay Store. We therefore assigned an IIS rating of - 3 (adequate) to this inspection.
- For LC27 (safety mechanisms, devices and circuits, SMDC): we noted that a common definition of SMDC is being developed by NGL and ONR. Overall we were satisfied that safety mechanisms were being appropriately addressed, even though they were not being specifically identified as such within the Maintenance Schedule or other site documentation. We assigned an IIS rating of - 3 (adequate) to this inspection.
- For LC28 (examination, inspection, maintenance and testing): we were satisfied that good arrangements were in place to ensure that the Decay Store met its nuclear safety requirements as set out in the plant safety case. We assigned an IIS rating of - 2 (good) to this inspection.
- For LC34 (leakage and escape of radioactive material and radioactive waste): we noted that there were no known leaks in the Decay Store system. Overall, we judged that the licensee had adequate processes in place to detect any such leaks. We assigned an IIS rating of - 3 (adequate) to this inspection.
Overall, we judged that the Decay Store Systems met the requirements of the safety case and were adequate.
Finally I held information exchange meetings with station staff on a range of topics including discussion of some fuel matters on site, an end of year conventional safety and security review, a review of the ONR issues database, progress with the interim outage, lift repairs, Reactor Cooling Water valve misalignment, progress with commissioning of the new Vaporiser Auxillary Boiler Plant and a meeting with the Nuclear Inspection and Oversight team on site.
The licence conditions were inspected against ONR's published guidance requirements (as described in our technical inspection guides).
Conclusion of intervention
There are no findings from this inspection that could significantly undermine nuclear safety. No actions were raised during this inspection.
The planned interventions set out in the Integrated Intervention Strategy for Hinkley Point B remain valid and will be followed for future inspections.