To be the specialist engineering design consultancy of choice, valued by our customers and respected by our employees

Integrated Solutions for Nuclear, Power and Petrochemical Industries

Since its formation in 2005, the aim of Tenet has been to provide expert design engineering skills to assist our Clients in the nuclear decommissioning effort. With a dedicated team of experienced designers and engineers, Tenet has proven capability to provide innovative solutions to tackle the most complex of engineering challenges.

As the company has grown and diversified, those skills have also been applied to nuclear new build, fuel enrichment and the growing renewable energy sector. With our head design office based in Birchwood Park, Warrington, Tenet is ideally placed to provide our services to other organisations operating in the North West’s thriving nuclear industry.

We also support the Britain’s Energy Coast Business Cluster (BECBC) in Cumbria and the emerging focus on carbon reduction initiatives in North Wales and Anglesey. Tenet prides itself on having an in depth understanding of our Client’s project requirements and getting the deliverables “RIGHT FIRST TIME”. Above all else, Tenet values the long term relationships we have built up with our Clients over time. Those relationships are based on trust, openness and the confidence they have in the quality of the work that Tenet delivers

Control, Electrical & Instrumentation

Tenet has a substantial team of Suitably Qualified & Experienced Personnel (SQEP) designers & engineers working in the following disciplines:
  • Control, Electrical & Instrumentation (EC&I) and Mechanical Engineering Design Services
  • E&I Building Services
  • Functional Safety & Design Substantiation (IEC 61508-61511)
  • Process Instrumentation Design and Engineering
  • Information Technology & Communications (ICT)
  • Facilities Management Technical Support
  • Client Specific Database Training
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Mechanical Design

Tenets Mechanical and ventilation design team have the capability to deliver high quality mechanical solutions for our clients in all sectors of engineering.

From Engineering Management through to 3D modelling and manufacturing drawing production, our engineers can take your project from initial concept and feasibility, independent technical assessment, through to detail design and engineering substantiation.

Our considerable experience of commissioning, Plant Modification Proposals (PMPs), Design Assessment Reports and plant operation documentation supports our clients through execution and operations.

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Project Management

Our project management team have over 100 years of experience in the nuclear, oil and gas, biomedical and pharmaceutical sectors.

Our core team supported by experienced associates and partners have lead major projects on nuclear licensed sites, provided multidiscipline design management of extensive specialist supply chains and have operated in all tiers of the supply chain, from client to specialist consultancy.

Our project managers are supported by a strong commercial and project controls capability ensuring each project has the appropriate tools and information to ensure communications and decision making.

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Meet the team

Mike Thirsk


An experienced engineer with over 35 years in the Nuclear industry, with extensive leadership and management skills and an ability to understand project and client requirements.

Having provided design solutions to several clients, Mike is extremely capable at the technical as well as the commercial aspects of the business.

Craig Rogers

Managing Director

30 years’ experience in the UK Nuclear industry, both client side and supply chain covering engineering and major projects delivery, construction and business management.

Kate McDermott

Commercial Director

Kate is highly focused on project delivery and proficient in developing and implementing organisational process and procedure. She is commercially and operationally astute and able to work across functional divisions to ensure a cohesive approach to achieving the project outcome.

Janine Rudenko

Operations Director

Operations / Project Manager with over 30 years proven experience in the highly regulated Nuclear Engineering industry with particular expertise in Project and Resource management, Project Delivery, Security and Quality.


Tenet hold ISO 9001 certification for developing Client concepts into detail design.  We pride ourselves on the Quality Management System (QMS) that we have developed.


The skilled and dedicated team consistently produce designs on time and to budget, frequently operating within very tight programme constraints. The basic skill-set is underpinned by many years of direct experience in engineering across a wide range of industry sectors.


Tenet place great emphasis on Health, Safety and Environmental issues, along with information and system security.  All of our team members are security vetted and have clearance to work on government-restricted networks. Our offices are accredited to allow us to work on Protectively Marked Information (PMI).

Building relationships with our clients by providing quality specialist engineering design services and delivering projects that are right first time.