Commissioning Test Manager

At Amentum, we're not just solving problems; we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. If you're passionate about making a real impact and want to be part of a community that values ethical excellence, this is the place where your ambition can thrive. Here, we believe that success comes from continuously pushing boundaries and working together to deliver on our promises. We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all.

We’ll inspire and empower you to deliver your best work so you can evolve, grow and succeed – today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive and diverse team who always strive to do the right thing for our people, clients and communities. 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.

About the Opportunity

The Decommissioning Alliance (TDA) is a strategic partnership, operating within the DNWP framework and delivering critical decommissioning work at Sellafield, including the UK’s most challenging Legacy Ponds facilities. As a key partner within DNWP, TDA contributes to Sellafield Ltd.’s mission while ensuring communities, supply chains, and stakeholders benefit from meaningful, measurable Social Value outcomes.

As a Commissioning Test Manager, your primary responsibilities involve overseeing the operational readiness verification of newly installed or modified Structures, Systems & Components. This includes ensuring compliance with Start Up procedures, Site License Conditions, and adherence to statutory and regulatory standards for safe and reliable operation.

Key duties involve collaborating with various stakeholders across project delivery teams and external contractors to ensure operational readiness of People, Plant & Procedures in alignment with client requirements. This requires effective Leadership, Communication, Coordination, and integration to deliver high-quality results. The Commissioning Test Manager shall support the client Start Up Manager to carry out managerial roles in leading a Start Up Team in the delivery of assigned Start Up projects in a

safe and effective manner.

Key Responsibilities:

• Ensuring safety as the highest priority on the project, striving towards Zero Harm, and act as a role model in all aspects of safety, nuclear, radiological, conventional, and environmental safety.
• Planning, balancing and prioritising Start Up resources to support successful project delivery and prioritisation of workload in line with project requirements.
• Provide support and input to multi discipline design reviews, HAZCONs HAZOPs, HAZANs, and input into risk management, contract, schedule and estimates.
• Support the development and implementation of procedures, ensuring compliance with Site Licence Conditions, legal and statutory requirements.
• Develop Start Up Strategies, identifying Resource Requirements, cost profiling and collaboration with the project team to initiate and manage sanctioning of future project costs.
• Identifying and implementing Intelligent Customer arrangements where required
• Identifying audits and assessments to ensure that the required standards are maintained
• Developing and implementing stakeholder management to optimise delivery, to obtain permissions and to mitigate risks.
• Support Commissioning Test and Operability Team Leaders with the coordination and deployment of a multi disciplined Start Up Team.
• Managing the approval of non-safety and safety critical Start Up Documentation

Here's What You'll Need:

• Extensive experience managing commissioning start-up activities within a highly regulated industry environment, preferably nuclear, defence, energy, or major infrastructure projects.
• Demonstrable knowledge of Nuclear Site Licence Conditions and the commissioning start-up arrangements required to achieve operational readiness.
• Proven experience leading multidisciplinary teams, coordinating resources, and delivering commissioning activities safely, on time, and within budget.
• Experience developing and implementing commissioning start-up strategies, including resource planning, cost forecasting, and programme integration.
• Strong understanding of safety management principles, including nuclear, radiological, conventional, and environmental safety requirements.
• Experience participating in and contributing to design reviews, HAZOPs, HAZANs, HAZCONs, risk assessments, and operational readiness reviews.
• Proven ability to develop, review, approve, and manage both safety-critical and non-safety-critical commissioning start-up documentation and procedures.
• Experience engaging and influencing a wide range of stakeholders, including project managers, design teams, operations personnel, contractors, vendors, regulators, and senior leadership teams.
• Knowledge and application of Intelligent Customer requirements and arrangements within a regulated industry environment.
• Experience planning and delivering audits, assessments, inspections, and assurance activities to ensure compliance with regulatory, statutory, and company requirements.

Our Culture

Our values stand on a foundation of safety, integrity, inclusion and diversity. We put people at the heart of our business, and we genuinely believe that we all succeed by supporting one another through our culture of caring. We value positive mental health and a sense of belonging for all employees.

We aim to embed inclusion in everything we do. We know that if we are inclusive, we’re more connected, and we’re more creative. We accept people for who they are, regardless of age, disability, gender identity, gender expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, and whether you’re pregnant or on family leave. This is reflected in our wide range of Global Employee Networks.

We partner with VERCIDA to help us attract and retain diverse talent. For greater online accessibility, please visit www.vercida.com 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.

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