Senior Mechanical Designer

Amentum is the Design and Engineering partner for Sellafield under the PPP (Programme and Project Partners). This is a 20-year arrangement to deliver ~£7bn of major projects. We are looking to recruit high value expertise from across regulated and comparable sectors to work in a collaborative environment. PPP is delivering major projects, site wide improvements and provision of supporting services.

The Sellafield Product & Residue Store (SPRS) Retreatment Plant (SRP) Project will provide a facility that receives Special Nuclear Material (SNM) from existing stores across the Sellafield site and processes it into a form suitable for safe and secure storage until 2120.

We are currently recruiting a Senior Mechanical Designer to produce and update 3D models and mechanical design drawings including but not limited to GA's, sub assemblies detail design drawings, layouts, MFDs etc.

As a Senior Mechanical Designer, other responsibilities could include:

• Providing support to resolution of testing Queries
• Providing support to resolution of manufacturing Technical Queries/production permits/concessions
• Provide design/detail design of machines, plant & equipment
• Involvement in the production of O&M manuals
• Involvement in the production of Design Risk assessment in accordance with BS EN 12100

As a Senior Mechanical Designer, you will already be:

• Qualified to HNC Standard as a minimum in a relevant discipline, or equivalent experience and knowledge
• Experienced in the use of Auto desk inventor
• Experienced in the use of Auto desk vault Basis or Vault Pro (file management).
• Have working knowledge of the BS 8888, BS EN ISO 8015, BS EN ISO 1101 & BS EN ISO 5459
• Have knowledge of key legislation CDM, SoMSR, PUWER & LOLER

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration. We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work.

When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.

We partner with VERCIDA, for greater online accessibility please visit  to view and access our roles.

As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team.

If you need a reasonable accommodation for any part of the employment process, please complete our Accommodation Request. Requests for accommodation will be considered on a case-by-case basis.

If you need assistance, please reach out to workday

• Free single medical cover and digital GP service
• Family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes
• Plus reimbursement towards relevant professional development and memberships

For more than 100 years, Amentum has tackled the world’s toughest challenges to deliver agile and steadfast solutions to the U.S. government and its allies. With more than 50,000 employees on all seven continents and in more than 60 countries, Amentum delivers a broad range of operational support services to meet the critical needs of our clients. Our headquarters are in Chantilly, VA.

Find us online at