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Principal Nuclear Security Engineer

Listing for: Assystem
Full Time position Listed on 2026-11-12

Job Description & How to Apply Below

Company Description Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements. Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

Job Description The role will provide experienced engineering support to the Design Authority responsible for security-related infrastructure and assets.  It will support the development and maintenance of engineering evidence, governance and assurance, helping ensure assets continue to meet their required performance throughout their lifecycle. The position will work alongside engineering teams, projects and other stakeholders, providing technical advice, challenge and knowledge transfer while supporting ownership of the function.

TASKS Develop, review and maintain engineering justification and supporting evidence for security-related assets.

Assess engineering information and provide proportionate technical advice, challenge and assurance.

Support the assessment and control of design changes, modifications and concessions.

Define and maintain appropriate inspection, maintenance and testing requirements, including review of results.

Provide engineering support and assurance to projects through design, commissioning and acceptance.

Support periodic review of assets and engineering evidence to identify and manage emerging issues.

Develop and improve engineering processes, procedures, standards and guidance.

Undertake or support independent technical and peer reviews.

Work collaboratively with client, contractors and other stakeholders across engineering, operations, maintenance and assurance.

Support client capability through technical advice, coaching and knowledge transfer.

QualificationsEXPERIENCEEssential:

Engineering experience in a high-hazard regulated environment.

Engineering substantiation or design justification for nuclear structures, systems and components.

A good understanding of security engineering principles and good practice, such as ONR's Security Assessment Principles (SyAPs) and Technical Assessment Guides, or IAEA guidance.

A working knowledge of nuclear safety cases and how they relate to security.

Experience of developing management arrangements or engineering processes.

Desirable:

Experience of working with the Ministry of Defence or on defence nuclear programmes.

Experience of security regulation or assessment.

Experience of working in a nuclear design authority.

QUALIFICATIONS & TRAINING Essential:

Engineering degree or equivalent experience.

Relevant qualification in Security or equivalent experience.

Desirable:

Chartered Engineer (CEng) or working towards it.

Chartered Security Professional (CSyP).Additional Information Why join the community of Switchers?:ð¹ The Group is currently ranked Third in the world for nuclear engineering.
ð¹A dynamic career management policy to enable our employees to progress through our five business lines: operations, project, technical, sales and support functions
ð¹Provide opportunities to work on exciting, global projects
ð¹Access to an employee assistance programme with free mindfulness, health, wellbeing resources and a confidential support line available 24/7 via phone or text
ð¹Discount vouchers for days out and restaurants, eye test and glasses vouchers, cycle to work scheme, free flu jabs Security clearance:

Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK…
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