Actemium Design UK, a trading name of North West Projects Limited, has over 35-years’ experience of multidiscipline engineering design across the full project lifecycle, including support through manufacture, testing and installation/commissioning in both the nuclear and non-nuclear environment. Our engineering design capability and experience has resulted in delivering robust solutions to our customers on mission critical and strategically important projects. As part of VINCI Energies with a turnover of €14 billion, Actemium Design UK is an agile business, growing in an exciting and sustainable manner. We offer a Competitive Salary Pension Benefits Hybrid and flexible working arrangements. Staff or Contract (within IR35) options available. Background to the role Actemium Design UK is currently producing the design of the Process Plant and Equipment (PP&E) to deliver an enduring manufacturing capability for a key customer in the defence industry. Acting as an Intelligent Client (IC) on behalf of the customer, we liaise with the suppliers of professional services and equipment vendors to ensure consistency and standardisation in the design of the process systems. We are recruiting a Senior / Principal Mechanical Engineer to author Mechanical Design Substantiation Reports which will underpin the design of the various process systems. In this first instance this role will be a seconded position with the client. The role includes: Authoring nuclear substantiation documentation, including Design Substantiation Reports (DSR) providing the assurance and evidence to enable confidence in our technical solutions. Reviewing safety case documentation and identifying potential shortfalls in the design Liaising with both internal and external designers and equipment vendors to gather information. Interrogating the Engineering Schedule and evidencing claims made against Systems, Structures, and Components (SSC) in the documentation. Interfacing with other stakeholders such as Human Factors, Fire Safety, Criticality, Radiological and the client Technical Authority. The Person Questioning attitude, confident to challenge information where needed. Previous experience in design substantiation and safety case involvement for highly regulated industries. Fully familiar with all aspects of safety case methodologies and legal framework relevant to nuclear safety. Good oral and written communication skills, including presentation and report writing. Several years’ experience working in design engineering. Degree with honours or Level 6 equivalent. Chartered Engineer or equivalent (or working towards). Security Clearance The successful candidate must be able to achieve and maintain a level of security clearance for this role. Many of the positions within our company are subject to national security clearance restrictions. This means that your eligibility for certain roles may be affected by your place of birth, nationality, current or former citizenship, and any residency you hold or have held. Further details are available at United Kingdom Security Vetting: clearance levels - GOV.UK (www.gov.uk) .