Site inspection of Hunterston A
- Site: Hunterston A
- IR number: 14-197
- Date: January 2015
- LC numbers: 10, 23, 24, 28, 34
Purpose of intervention
This report covers interventions in pursuit of the ONR integrated intervention strategy for Hunterston A, in particular to address regulatory issues identified as part of Inspection plan and carry out the planned Compliance inspections
Interventions Carried Out by ONR
This report covers interventions at Hunterston A mainly to conduct System-based inspection on essential services and follow-up of regulatory actions placed on the site from previous inspections as follows:-
Explanation of Judgement if Safety System Not Judged to be Adequate
ONR concluded that the Essential Services met the requirement of the safety case. There were however queries in relation to certain electrical switchgear and control panels and their compliance with LC 28 regarding asset care and configuration control. The ONR inspector will follow-up these issues with the licensee as part of routine engagements.
Key Findings, Inspector's Opinions and Reasons for Judgements Made
Only the System-based / Compliance inspections are included in the executive summary as all other interventions are for information only.
We concluded that:
- LC10 (training) – IIS Rating 2 (Good). We were satisfied that training and development of staff was effectively controlled and overseen by suitably qualified and experienced persons. Evidence of a structured training programme for staff was noted.
- LC23 (operating rules) – IIS Rating 3 (adequate). We were satisfied that the safety case limits have been identified and an appropriate Operating Rule was implemented.
- LC24 (operating instructions) – IIS Rating 3 (Adequate). We were satisfied that adequate operating instructions were in place and that these were to the required format, suitably presented and appropriately followed.
- LC27 (safety mechanisms, devices and circuits) – Not Rated
The passive nature of the site’s radiological hazard is such that the safety case has no requirement to prevent a criticality occurring or to remove decay heat. Therefore the site’s essential services have no requirement for SMDCs as stipulated in LC27 and so these have not been rated during this inspection.
- LC28 (examination, maintenance, inspection and testing) – IIS Rating 4 (below standard). Overall, we were satisfied that the site essential services are adequately maintained in accordance with the safety case requirements. However, shortcomings have been identified in a number of maintenance areas and the condition of some plant did not meet the high standards required for nuclear facilities.
- LC34 Leakage & Escape of Radioactive Material & Radioactive Waste. Rating – 3 (Adequate). The passive nature of the waste allows time for monitoring to be put in place and arrangements are implemented to address any non-compliant packages that may be created owing to a loss of essential services.
In order to inform our judgement we have considered the evidence observed in relation to good practices and areas where we consider there to be shortfalls in compliance. To conclude based upon balance of evidence presented by the Licensee during this inspection; we consider that the requirements of the safety case have been adequately implemented at Hunterston A.
There are no findings from this inspection that could significantly undermine nuclear safety.
Conclusion of Intervention
The system based inspection highlighted areas of good practice and areas of deficiency within the safety case and facilities viewed. A Letter will be sent to site detailing the findings of the inspection and requesting site to address the deficiencies found. A level 4 regulatory issue will be raised regarding the asset management and condition monitoring covering the recommendations raised in this record as follows:
- Licensee to clarify the required equipment to carry out actions to satisfy Hunterston A site’s OR1 and ensure that they are captured within the Nuclear Maintenance Schedule.
- Licensee to assess the requirement to replenish transformer oil lost through sampling or other losses.
- Licensee to ensure that all UPS and battery back-up units, including Seal Oil Switchboard battery units, are maintained in accordance with manufacturer’s instructions and appropriately recorded.
- Licensee to produce a plan to rectify the deteriorated condition of the Morris hoist control panel.