Office for Nuclear Regulation

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Torness - SBI20 - Liquid Radwaste System

Executive summary

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) Torness power station in line with the planned inspection programme contained in the Torness Integrated Intervention Strategy (IIS) for 2018/19. 

Interventions Carried Out by ONR

The ONR nominated nuclear liabilities specialist inspectors 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) :-

The SBI was planned and led by EDF’s Independent Nuclear Assurance (INA). The Scottish Environment Protection Agency (SEPA) 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;

The system based inspection was planned, prepared and led by the EDF’s Independent Nuclear Assurance (INA), the minor shortfalls identified will captured within the INA report and the actions to address the shortfalls will be raised with the stations action management system.  We consider that there was thorough preparation work carried out by INA, and INA provided a robust challenge to the station during the inspection.  

The site inspector followed up on a number of extant regulatory issues, and a recent event related to the bolts on a fuel transport flask.    

Conclusion of Intervention

On the basis of this 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.  No additional regulatory action is needed over and above the planned interventions of Torness power station as set out in the Integrated Intervention Strategy, which will continue as planned.