Hartlepool Power Station - SBI20 Liquid Radwaste
- Site: Hartlepool
- IR number: 16-060
- Date: June 2016
- LC numbers: 10, 23, 24, 27, 28, 34
Purpose of intervention
The purpose of this intervention was to carry out a system based inspection of the liquid radioactive waste at the EDF Energy Nuclear Generation Limited's (NGL's) Hartlepool power station in line with the planned inspection programme contained in the Hartlepool Integrated Intervention Strategy (IIS) for 2016/17.
Interventions Carried Out by ONR
The ONR nominated site inspector and nuclear liabilities specialist inspector performed a System Based Inspection (SBI) of the liquid radioactive waste system to judge the system performance against its safety function. Through examination of this system and associated sub-systems, we performed compliance inspections against the following Licence Conditions (LCs) :-
- LC 10 - Training
- LC 23 - Operating rules
- LC 24 - Operating instructions
- LC 27 - Safety mechanisms, devices and circuits
- LC 28 - Examination, inspection, maintenance and testing
- LC 34 - Leakage and escape of radioactive material and radioactive waste
The Environment Agency Site Inspector also took part in this intervention.
Explanation of Judgement if Safety System Not Judged to be Adequate
From the areas sampled during this inspection, we judged that overall the liquid radioactive waste system met the requirements of the safety case.
Key Findings, Inspector's Opinions and Reasons for Judgements Made
With respect to the SBI the following judgements were made;
- LC 10 (Training) - We examined the training records for a sample of the personnel involved in the operation of the liquid radioactive waste system. The evidence identified the training requirements for each role profile and we found that all relevant training was in date. We therefore assigned an IIS rating of green to LC10 compliance.
- LC 23 (Operating Rules) - Based on the evidence sampled, we concluded that the limits and conditions had been identified within the safety case and relevant environmental specification. The station provided adequate demonstration that the relevant limits and conditions had been implemented in an adequate manner. ONR placed an action on NGL to update the environmental specification and supporting commentary to reflect the recent facility equipment updates. Notwithstanding this, compliance with LC 23 was generally consistent with ONR expectations and hence assigned a rating of Green.
- LC 24 (Operating Instructions) - We sampled a number of procedures associated with this system; discharge of the final monitoring and delay tanks (FMDT) and the transfer of effluent between the initial monitoring and delay tanks (IMDT) and FMDT. Based on the evidence sampled, we concluded that the operating instructions provided to station staff were appropriate to ensure that operations that could affect safety are adequately controlled and that relevant operating rules are implemented. Accordingly we assigned an IIS rating of green for LC24 compliance.
- LC 27 (Safety Mechanisms, Devices and Circuits) - We reviewed devices identified in the Station's Plant Maintenance Policy against safety case requirements and environmental specifications. We judged that the sampled equipment are subject to suitable and sufficient surveillance to confirm their availability and suitable arrangements were in place to log any unavailability to ensure that the plant was not operated outside of the identified safety case limits. We therefore considered that compliance with LC27 met our expectations with an inspection rating of green.
- LC 28 (Examination, Inspection, Maintenance and Testing) - We sampled the maintenance requirements associated with the final monitoring and delay tank and some other radioactive storage vessels. In the areas sampled the maintenance was being undertaken in line with the requirements of the maintenance schedule. Following the inspection, ONR placed an action on NGL to confirm that pipework and tanks within the Gas Circulator Maintenance Facility and interlock within the Tritiated Water Storage and Discharge System are subject to regular and systematic maintenance. We confirmed that the leak detection instrumentation within the system was functional and subject to routine maintenance and testing. On the basis that any leak would be detected the issue was considered relatively minor. Notwithstanding this minor issue, compliance with LC28 was considered to be generally consistent with recognised good practice and therefore an inspection rating of green was assigned.
- LC 34 (Leak and Escape of Radioactive Material and Radioactive Waste) - Based on the evidence sampled and the plant walk-down, we concluded that suitable and sufficient systems were in place to ensure adequate control and containment of radioactive material and radioactive waste and therefore an inspection rating of green was assigned to LC34 compliance.
An ONR level 4 issue has been raised to capture the actions identified in this intervention report. Satisfactory close-out of the issue will be progressed by the site inspector.
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
Following the system based inspection of the liquid radioactive waste system we judged that compliance with LC10, 23, 24, 27, 28 and LC34 met the expected standards and were rated as green. Overall we judged that the liquid radioactive waste system met the requirements of the safety case.
There are no findings from this inspection that could significantly undermine nuclear safety. At present, no additional regulatory action is needed over and above the planned interventions of Hartlepool power station as set out in the Integrated Intervention Strategy, which will continue as planned.