Mechanical Designer; Checker

The Opportunity

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 SIXEP Continuity Plant, being delivered by the PPP at Sellafield, will ensure the site's existing Site Ion Exchange Effluent Plant (SIXEP) facility can continue its vital work for decades to come. The newbuild SCP facility will play a vital part in Sellafield's purpose to create a clean and safe environment for future generations.

Within the SCP project, a design package is underway to cover the mechanical design of a shielded piping system including pipes, supports, radiological shielding, valves, valve spindle extensions, actuators, and a through-wall gamma monitor assembly. The drawings currently being produced include detailed drawings (for manufacture), general assembly drawings and installation drawings. These drawings will all be compliant with the latest revision of BS EN 8888.

As a key member of the project team, you will be responsible for checking all the mechanical drawings prior to their release for manufacture.

• Proven, recent, track record of checking GA and detailed “level 3” manufacturing maturity mechanical drawings to BS EN 8888. (The latest version is preferable, but not essential).
• Experience of working within a highly regulated industry, (ideally have been gained within the nuclear industry).
• Conversant with the relevant engineering standards for delivery of high integrity piping installations and associated equipment.
• Familiar with nuclear containment and shielding principles/design.
• Working knowledge of Geometrical product specifications (GPS) to ISO 8015 and welding to BS EN ISO 2553.
• Checking engineering documentation such as risk assessments, outline installation method statements, calculations and operation & maintenance manuals.

People are our greatest asset, and we offer a competitive package to retain and attract the best talent. In addition to the benefits you’d expect, UK employees also receive 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.

Work-life balance and flexibility is a key focus area for us. We’re happy to discuss hybrid, part-time and flexible working hours, patterns and locations to suit you and our business.

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.

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.