Planned inspection at Heysham 1 Power Station
- Site: Heysham 1
- IR number: 17-100
- Date: September 2017
- LC numbers: 12, 22, 23, 24, 25, 26, 27, 28
Purpose of Intervention
This was a planned inspection at EdF Energy Nuclear Generation Ltd's (NGL's) Heysham 1 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 inspection programme contained in the Heysham 1 Integrated Intervention Strategy (IIS).
Interventions Carried Out by ONR
During this intervention, the following key activities were undertaken
- Themed inspection examining control and supervision of operations and maintenance.
- Licence condition compliance inspection - Control of modification and experiments on existing plant.
Explanation of Judgement if Safety System Not Judged to be Adequate
No system based inspection was undertaken, hence not applicable.
Key Findings, Inspector's Opinions and Reasons for Judgements Made
We evaluated compliance against the following site licence conditions during the themed inspection:
- Licence Condition 12 (Duly authorised and other suitably qualified and experienced persons) - We sampled training records of duly authorised persons controlling and supervising operations and found their training records supporting the appointments to be up to date. We also interviewed personnel responsible for ensuring the integration of control and supervision into the training of Central Control Room duly authorised persons. We were satisfied that the control and supervision aspects of their training adequately addressed the necessary requirements. We therefore assigned a rating of Green (no formal action) for LC12 compliance.
- Licence Condition 23 (Operating Rules) - We sampled Control Room logs, including the technical specification action tracking log and the significant defects and Unavailability Priority List. Based upon the evidence, the station demonstrated that operations were controlled and carried out in compliance with safety case limits and conditions. We therefore assigned a rating of Green (no formal action) for LC23 compliance.
- Licence Condition 24 (Operating Instructions) - The work activities observed during the inspection were conducted in accordance with written instructions. We identified potential improvements in the specific work observed by the potential increased use of human performance tools e.g. point-touch-verbalise and three way communications. We assigned a rating of Green (no formal actions) for LC24 compliance.
- Licence Condition 25 (Operational Records) - The sampled document records, safety case limits and conditions and Duly Authorised Persons (DAP) appointment and training records were examined and found to be adequate. We therefore assigned a rating of Green (no formal actions) for LC25 compliance.
- Licence Condition 26 (Control and Supervision of Operations) - We examined hand over certificates and return to service logs, as well as observing a plant area returned to service. Documentation requirements appeared to be sound, but we did find that in the records sampled not all steps were positively reported eg confirmation checks that plant labelling and housekeeping were in order. The plant recently returned to service was found to have some minor issues such as a missing plant label and housekeeping which was not to the expected standard. We examined the control and supervision elements of control room operator training and found it to be adequate. We also examined the operations of the Safety Document Office and found the arrangements to be adequate. Our observation of setting to work and pre-job briefs for maintenance staff was judged to be satisfactory. Maintenance activities on the plant were considered to be in accordance with arrangements although we judged that local contamination control arrangements within the Radiation Controlled Area could be further improved. We assigned a rating a Green (no formal actions) for LC26 compliance.
- Licence Condition 27 (Safety Mechanisms, Devices and Circuits) - We sampled the availability of safety mechanisms, devices and circuits providing reactor protection, by examination of the main Central Control Room logs and by discussion with control room operators. We assigned a rating of Green (no formal actions) for LC27 compliance.
- Licence Condition 28 (Examination, Inspection, Maintenance and Testing) - We sampled arrangements for planning maintenance activities and for dealing with emergent maintenance issues. We found that there was evidence of good cross functional working eg with Operations and Engineering, at daily work review meetings to ensure optimal prioritisation of maintenance activities. We sampled some of the work of the Diagnostic and Response Team (DART), and found the arrangements to be adequate. We sampled a number of maintenance activities and concluded they were conducted by suitably qualified and experienced persons in accordance with written instructions and were subject to control and supervision commensurate with the nuclear safety significance of the task. We therefore assigned a rating of Green (no formal actions) for LC28.
- Management of Health and Safety at Work Regulation 5 (Health and Safety Arrangements) - We examined various elements of work management and control of work processes. There was sufficient evidence that control arrangements were being considered during the work planning process. We therefore assigned a rating of Green (no formal actions) for MHSW Reg 5.
- Licence Condition 22 (Modification or Experiment on Existing Plant) - In respect to licence condition 22, we were satisfied NGL demonstrated appropriate arrangements for LC 22 and found no issues with their specific implementation for the chemistry regime change in the Reactor Auxiliary Cooling Water (RACW) and Turbine Hall Cooling Water (THACW) systems. NGL are implementing operating experience (OPEX) from other stations within the fleet. The Station is judged to have control over the chemistry change through a SQEP forum via the Testing & Commissioning Panel (T&CP) as part of their arrangements. Overall, we judge the LC22 aspect of the inspection to be adequate, warranting an IIS rating of Green.
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
The themed inspection examined compliance against LC12, LC23, LC24, LC25, LC26, LC27, LC28 and MHSW Reg 5. Additionally, a LC22 compliance inspection was also undertaken. Overall, based on the evidence sampled, inspectors judged that legal requirements were met. We observed a number of work activities, examined management arrangements and sampled key documentation covering plant status control, work planning and work execution. In all cases the level of control and supervision was commensurate with the safety significance of the associated task. ONR has assigned a rating of Green (no formal actions) against the each of the legal requirements inspected.