Copello are working with a leading defence and engineering organisation to recruit a Principal Safety Engineer to join a long-term programme at the forefront of the UK’s nuclear sector. This role is perfect for someone who enjoys working in high-integrity, regulated environments and wants to take real ownership of key safety deliverables. You’ll be part of a team that directly supports the development and ongoing assurance of nuclear safety cases — working closely with Engineering, Human Factors and Site Safety teams to keep standards high and the plant safe. What you’ll be doing: * Authoring and managing nuclear site assets' design substantiation documentation supporting the site nuclear safety case * Collaborating with the wider business on site assets nuclear design substantiation related activities * Supporting the implementation of design substantiation requirements * Reviewing analyses, assessments, and calculations supporting nuclear design substantiation * Supporting periodic review of safety * Taking ownership of deliverables, and demonstrating high levels of autonomy and leadership * Support in the development of other Nuclear Substantiation team members * Working closely with a broad range of stakeholders including Site Safety Case, Human Factors, and Engineering Authority Teams Your skills and experiences: Essential: * Degree qualified in a STEM subject or equivalent working expe...