The purpose of this intervention was to undertake licence condition (LC) compliance inspections at EDF Energy Nuclear Generation Limited's (NGL) Hartlepool Power Station, in line with the ONR's Operational Facilities Division intervention strategy.
The intervention was carried out by the ONR site inspector, supported by a number of specialist inspectors.
We performed two safety case informed system based inspections (SBI) of the Turbine overspeed and Instrument Air system; and the Emergency Generation System. During examination of these systems, inspections were performed against the following Licence Conditions (LC), which are applicable provisions of the Energy Act 2013:
We judged that overall these systems fulfil the requirements of the safety case.
Based on the evidence examined during this inspection, we consider that generally NGL has implemented those safety case claims that relate to the turbine overspeed and instrument air systems. During the inspection we found that Hartlepool power station has effective arrangements control the availability of this equipment. We found that adequate training is provided to operations staff in the use and testing of these systems.
We judged that arrangements for management of the turbine overspeed and instrument air system met legal requirements and therefore awarded an intervention rating of Green in relation to compliance with LCs 10, 23, 24, 27, and 28. A level 4 ONR issue will be raised to monitor the resolution of minor opportunities for improvement identified during this inspection.
We concluded that limits and conditions of operation for the system adequately specified within NGL's Technical Specifications. Operational documentation sampled provided satisfactory evidence of compliance with these limits. We concluded that procedures sampled provided appropriate instructions for the operation and testing of the gas turbine system. We found that NGL had developed and implemented a comprehensive maintenance programme for the equipment.
Overall we judged that arrangements for management of emergency generation system generally met relevant good practice and awarded an intervention rating of Green in relation to compliance with LCs 10, 24, 27, and 28. A level 4 ONR issue will be raised to monitor the resolution of minor compliance shortfalls identified against these license conditions.
During our inspection we noted that electrical cabinets supplying three fuel oil transfer pumps were installed within an area covered by a (water based) fire suppression system. At the time of the inspection, NGL could not provide sufficient evidence to demonstrate that the risk of disruption to the supply fuel to the Emergency Generators in the event of activation of the fire suppression system had been evaluated in the safety case. We have therefore assigned an inspection rating of Amber against LC23.
A level 3 ONR issue will be raised to monitor resolution of this finding, which does not detract from my overall inspection conclusions. The issue will be followed up during future routine regulatory engagements.
From the evidence sampled during inspection ONR consider that the Emergency Generation system and Turbine Overspeed & instrument air systems met the requirements of the safety case.
There are no findings from this inspection that could significantly undermine nuclear safety. No additional regulatory action is needed over and above ONR's planned interventions at Hartlepool Power Station as set out in our Integrated Intervention Strategy, which will continue as planned.