Planned inspection at Dungeness B power station
- Site: Dungeness B
- IR number: 17-098
- Date: September 2017
- LC numbers: 24, 25, 26
Purpose of Intervention
This was a planned inspection at EDF Energy Nuclear Generation Ltd's (NGL's) Dungeness B power station. It was 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 Dungeness B Integrated Intervention Strategy (IIS).
Interventions Carried Out by ONR
During this intervention, the following key activities were undertaken:
- A planned unannounced inspection.
- Quarterly update on regulatory issues.
- Meeting with Independent Nuclear Assurance (INA).
- Routine engagement with Deputy Technical Safety Support Manager and Station Director.
- Update meeting on plant configuration improvements.
Explanation of Judgement if Safety System Not Judged to be Adequate
No system based inspection undertaken, hence not applicable.
Key Findings, Inspector's Opinions and Reasons for Judgements Made
I undertook a planned unannounced inspection during silent hours, focusing on commissioning activities associated with LC24, LC25 and LC26 during reactor 21 periodic shutdown, I:
- Sampled the reactor 21 start-up flow sheet and supporting return to service compliance check sheet for pressure vessel commissioning. I also sampled procedure use and adherence of the reactor start-up station operating instruction.
- I observed the control room supervisor shift handover and the operations team start of shift brief.
- Found the operating records supporting the pressure vessel commissioning being completed and readily available. I also found good place marking and procedure use and adherence of the unit start up station operating instruction.
- I observed good use of three way communication and clear nuclear safety focus during the shift handovers and start of shift briefs.
- No significant shortfalls were identified; observations were made relating to quality of the return to service documentation. This was rectified quickly, no further regulatory action was required.
- No significant shortfalls were identified against legal requirements for LC24, LC25 and LC26, therefore based upon my sampled inspection I judge no formal action is required and assign a GREEN rating against this planned unannounced inspection.
- I undertook routine engagement with the station and the independent nuclear assurance team to discuss outage and station performance including recent events. I judge that the station is taking the appropriate action to management performance and investigate events. No significant nuclear safety concerns were raised during these discussions.
- I held a quarterly review of the station's regulatory issues, and discussion a number of these in detail with the station lead. The information received will be sued to update ONR's regulatory issues, no significant safety concerns were raised during these discussions and progress is being made in all areas.
- I requested an update on the improvement initiative relating to plant configuration. I judge that the station is making good use of organisational learning in this area, there was evidence that the working group is actively progressing with the improvement plan. I will monitor progress of the improvement plan as routine regulatory business.
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
In relation to the planned unannounced inspection which focussed on start-up activities and shift handovers, I judge no formal action is required and a GREEN rating has been assigned to LC24, LC25 and LC26.
There are no findings from this inspection that could significantly undermine nuclear safety.