Office for Nuclear Regulation

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Inspection in support of IIS

Executive summary

Purpose of intervention

In line with the 2014/15 inspection plan for Dounreay I carried out planned inspections and other interventions to provide evidence that Dounreay Site Restoration Limited (DSRL) is controlling its hazards properly and complying with its statutory obligations.

Interventions Carried Out by ONR

I carried out planned inspections for compliance with Licence Condition (LC) 21 (Commissioning), concentrating on the Breeder Fuel Facility (BFR); and LC22 (Modification or experiment on existing plant), which considered a proposal to install a mezzanine floor to support plant associated with the proposed unirradiated fuel characterisation facility (UFCF).  I followed up two Regulatory Actions on emergency arrangements.  I participated in a meeting of ONR site inspectors and Dounreay safety representatives and in various update meetings.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

In my opinion DSRL has made adequate arrangements for managing commissioning.  DSRL’s commissioning arrangements have been, and are being, implemented to a good standard at BFR.  Practices on BFR are being rolled out elsewhere on site which should help promote similar good standards of commissioning. 

I consider that DSRL’s modification proposals for the construction of the mezzanine floor are consistent with the licensee and ONR guidance on compliance with LC22.  This view is without prejudice to further consideration of the construction safety case for the mezzanine floor.

DSRL has made good progress with resolving two Regulatory Actions:  (1) its relationship with NHS, to ensure that there is adequate medical cover for dealing with contaminated workers when Dounreay is operational, and (2) the close-out of an issue related to the inconsistency in the application of site lockdown in an emergency.  There has been effective dialogue DSRL and NHS to address the first action, and an ONR radiation protection specialist will consider this further during a planned inspection in May 2015.  DSRL has revised its procedure on site lockdown to underline that the initiation of lockdown arrangements should not be a default position, which should ensure that each event is taken on its merits and appropriate command and control invoked.

Conclusion of Intervention

The intervention did not identify any matter impacting on nuclear safety that required immediate regulatory action.