Following loss of power to the Waste Vitrification Plant (WVP) Line 3 on the 27th November 2013 and subsequent Office for Nuclear Regulation (ONR) investigation, ONR issued Sellafield Ltd (SL) with an Improvement Notice (IN) for apparent contravention of Licence Conditions 27 (Safety mechanisms, devices and circuits), 28 (Examination, inspection, maintenance and testing, EIM&T) and 34 (Leakage and escape of radioactive material and radioactive waste). ONR also attached a Schedule to the IN requiring improvements to the Line 3 Vitrification and Breakdown Cell containment boundary.
The purpose of this intervention was to monitor SL's progress against the IN Schedule and to clarify any further work required to adequately close out the IN before its due date of 31st October 2014.
We conducted this intervention using the IN Schedule as a basis for the agenda and systematically inspected SL's delivery against each section.
Based on the evidence sampled, we judge SL's approach to closing out the IN is adequate. We judge SL has already met the following sections of the IN Schedule:
Based on the evidence sampled, we advised SL that it needs to complete its proposed programme of work in the following areas to close out the IN:
Based on the evidence sampled, we judge SL's approach to closing out the IN is adequate. SL was able to adequately demonstrate it had satisfied a number of sections of the IN Schedule. SL needs to complete its programme of work in a number of areas to close out the IN. We agreed with SL to maintain weekly dialogue and undertake a proportionate follow-up inspection of the containment boundary as detailed in the IN Schedule and gain assurance of final IN close out. This will be conducted before 31 October 2014.