Office for Nuclear Regulation

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Torness - System Based Inspection - SBI06 - Emergency Generation System

Executive summary

Purpose of intervention

The purpose of this intervention was to undertake a system based inspection of the Emergency Generation System at EDF 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 2016/17.

Interventions Carried Out by ONR

As part of this intervention, ONR's Electrical Specialist Inspector, Radiation Protection Inspector and Nominated Site Inspector performed a System Based Inspection (SBI) of the Emergency Generation System to judge the system performance against its safety function. Through examination of this system and associated sub-systems we performed compliance inspections against Licence Conditions LC10 (Training), LC23 (Operating rules), LC24 (Operating instructions), LC27 (Safety mechanisms, devices and circuits), LC28 (Examination, inspection, maintenance and testing). LC34 (Leakage and escape of radioactive material and radioactive waste) was not considered applicable to this system. The inspections were based on sampling the implementation of the arrangements in place against each licence condition.

Explanation of Judgement if Safety System Not Judged to be Adequate

From the inspection, we judge that overall the Emergency Generation System meets the requirements of the safety case and is adequate.

Key Findings, Inspector's Opinions and Reasons for Judgements Made

During the course of the system inspection and based on the areas sampled, it was found that Torness has adequate arrangements in place to ensure that the Emergency Generation System is maintained and operated in accordance with the safety case and the station's arrangements.

In summary, the outcome from the SBI of the Emergency Generation System is that the system adequately fulfils the requirements of the safety case. Ratings for the Licence Conditions are as follows:

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

After considering all the evidence examined during the sample inspections undertaken against LCs 10, 23, 24, 27 and 28, we considered that the Emergency Generation System met the requirements of the safety case. LC34 was not applicable to this system.

No ONR Issues were raised as a result of this intervention; however, areas for improvement and minor shortfalls identified during the course of this inspection have been recorded within the station's action tracking arrangements, and will be monitored by ONR as part of normal regulatory activity.

There are no findings from this inspection that could significantly undermine nuclear safety.