Office for Nuclear Regulation

Magnox Ltd Harwell - Compliance Inspection of LC 11

Executive summary

Purpose of Intervention

This Licence Condition 11 inspection at Magnox Ltd’s Harwell licensed nuclear site was undertaken as part of a programme of planned interventions as outlined in the Magnox Ltd southern sites’ inspection plan for 2018/19.

Interventions Carried Out by ONR

During this inspection ONR assessed the Harwell Magnox Ltd Level 1 emergency exercise codenamed "Yellowhammer".  This inspection consisted of observing site personnel implementing the site’s emergency arrangements in response to a simulated emergency.

Explanation of Judgement if Safety System Not Judged to be Adequate


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

In my opinion the planning for the exercise was thorough, and that the dual incident scenario was sufficiently challenging for Harwell to demonstrate its emergency arrangements.  A number of good practices and some areas for improvement were identified by ONR, which were conveyed to the licensee in the post-exercise de-briefing meeting. 

Conclusion of Intervention

Taking into account the exercise planning/scenario and the observations made by the ONR team during the exercise, ONR considered the emergency exercise to be an adequate demonstration of the site's emergency arrangements made under Licence Condition 11.