The purpose of this intervention was to undertake a system based inspection of the Site Electrical System at the Low Level Waste Repository Ltd’s (LLWR) licensed site in line with the planned inspection programme contained in ONR’s LLWR Integrated Intervention Strategy (IIS) for 2015/16.
ONR Electrical Specialist Inspectors performed a system based inspection (SBI) of the LLWR Site Electrical System to judge the system’s performance against its safety function and to review the adequacy of actions taken, at a site-wide level, on loss of power. Licence Conditions (LC) considered during the inspection included 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) and LC 34 (Leakage and escape of radioactive material and radioactive waste).
The ONR Specialist Inspectors considered that:
LLWR has adequate arrangements to ensure that the Site Electrical System is maintained and operated in accordance with the safety case and the site’s arrangements.
The nuclear safety case arguments placed on the Site Electrical System are limited and are not significantly compromised by foreseeable loss of power scenarios.
In summary, the outcome from the SBI of the LLWR Site Electrical System is that the system adequately fulfils the requirements of the safety case.
The intervention was performed in line with ONR’s guidance requirements (as described in our technical inspection guides) in the areas inspected.
The ONR Specialist Inspectors considered that the Site Electrical System met the requirements placed on the system from the site nuclear cases.
From the information gathered and evidence obtained during this inspection no new significant matters have been identified that are likely to have significant impact on nuclear safety at this time.