Skip to content

Our vacancies

Search Jobs  

Senior Mechanical Engineer

Job Introduction

Job Description for Senior Mechanical Engineer:

NNL is where your solutions solve real-world problems. As part of our Engineering team, you’ll not only be able to get involved with a huge variety of projects, you’ll also have lots of opportunity to drive them through from start to finish — allowing you to see the impact your work has in a real-world environment. This is your chance to use your experience, expertise and ingenuity to collaborate with leading scientists. You’ll be part of a team that delivers work to benefit society by advancing cleaner energy, protecting the environment and keeping everyone safe.

This role will support a varied portfolio of engineering tasks and projects in the Windscale Laboratory to ensure the facility continues to deliver for NNL’s internal and external customers. The role holder will be part of a multidiscipline team and will be expected to support the delivery of new systems / components and support the delivery of solutions to engineering problems and issues encountered on the plant during normal operations, maintenance, and breakdown phases of facility plant operations. The role holder will be expected to provide a quick response to issues on plant, providing solutions that meet the required statutory site and national safety standards, comply with NNL’s integrated management system, and meet customer expectations to reduce plant downtime to a minimum. The role supports engineering delivery work tasks at NNL’s Windscale Laboratory and will include engineering development / testing work at NNL’s Workington Facility.

The role holder can therefore be based at Windscale or Workington (to be decided at interview) and will include hybrid working (split between office and home working).

Role Responsibility

Main Description for Senior Mechanical Engineer:

  • Provide specialist design services to clients and customers.
  • Production of design and engineering deliverables to the agreed standards, quality, schedule, and cost.
  • Contribute to the economic design of systems and equipment.
  • Oversee the work of others and develop the skills and abilities of others for the benefit of NNL.
  • Keep updated with all engineering legislative requirements, and changes in directives, standards, and regulations.
  • Provide engineering discipline guidance to others.
  • Actively participate in the development and application of appropriate technical and managerial processes and systems.
  • Comply with all legislative, regulatory and company policy standards and processes applicable to the role.

The Ideal Candidate

Essential Criteria for Senior Mechanical Engineer:

  • Degree / HND / HNC in an Engineering discipline or closely related subject together with a good level of discipline design and design office experience.
  • Proven knowledge and experience following an accredited design / engineering process to deliver an assured design / system that meets all required statutory site and national safety standards. Including a working knowledge of the requirements of PUWER and CE / UKCA marking.
  • Proven knowledge and experience using AutoCAD and 3D CAD software such as Inventor, Solidworks, Vault, together with Microsoft Office applications to provide fit for purpose engineered solutions.
  • Proven knowledge and experience of using the EU directives, British Standards and company standards and procedures.
  • Excellent verbal and written communication skills, to enable fit for purpose engineered solutions, ideas, and concepts to be clearly communicated to customers, regulators, and key stakeholders.
  • Chartered Engineer preferred, minimum Incorporated Engineer, although equivalent experience will be taken onto consideration.
  • Proven knowledge and experience in system and component fault finding in operational active and non-active nuclear facilities, preferable on the Sellafield site. This role is to provide fit for purpose engineered options and solutions from design and procurement through to return to operations to limit the time equipment is out of service due to faults, breakdowns or malfunctions. The Windscale Laboratory is focused on safely delivering customers scopes of work to agreed schedules, this role will support that objective and be expected to proactively reduce the likelihood of non-delivery of customers scopes of work.
  • Proven knowledge and experience in the design, build, testing, installation, and commissioning of new plant systems and components, and modifications to existing systems and components. Examples of systems and components to be supported are mechanical handling / operating equipment, mechanical safety systems, compressed air, water, and ventilation systems.
  • Ability to obtain SC level security clearance (this includes but is not limited to identity, employment, financial and criminal record checks plus 5 years’ worth of UK residency).

Desirable Criteria for Senior Mechanical Engineer:

  • Experience working in the nuclear sector preferable on the Sellafield site, with a working knowledge of Sellafield Site Procedures, Engineering Standards and Site License Conditions. 
  • Proven knowledge and experience of using Sellafield Ltd Engineering Standards in the design process and the Sellafield site drawing registry, CIMAGE. 
  • Knowledge and experience in producing mechanical and structural calculations to relevant industry design standards ie EU directives, British Standards. 
  • Knowledge and experience in the substantiation of mechanical equipment designated as safety equipment in a safety case to Sellafield Engineering Standards and produce substantiation reports to substantiate that equipment to the relevant standard. 
  • Knowledge and experience writing or supporting the production of Plant Modification Proposals (PMP’s) to modify equipment and plant on the Sellafield site.

About the Company

NNL is an incredible place to work A place where people do things that have never been done before A place where people push boundaries to further themselves, the business, and society as a whole.

This is a place where personal and professional opportunities are limitless. If you want to change the world, if you want to tackle climate change, if you want to help advance medical science, if you want to help put things in space, if you want to answer the big questions, if you want to work with extraordinary materials, if you want to meet great people, learn new skills, challenge yourself, work flexibly, and build a long successful career with the power to make a real impact… you can do it all here.

NNL has a vision for Equality, Diversity, and Inclusivity (ED&I) where NNL aims to be an inclusive workplace that attracts diverse talent through transparent and equal policies and procedures. We want you and the diverse mix of people that we employ, customers that we service, and stakeholders that we influence to feel valued. We encourage a workplace culture where everyone can thrive with a sense of belonging.

Recruitment Agency Notice


We operate a strict Preferred Supplier List (PSL) for the provision of recruitment services. Only agencies on our PSL may provide CVs and only when the role is released to them by our recruitment team. We will not accept unsolicited CVs from suppliers not currently on our PSL. We explicitly reserve the right to add candidate details from unsolicited CVs from non-PSL agencies into our own candidate database and to pursue/hire such candidate(s) without any obligation, financial or otherwise, to the agency concerned.

National Nuclear Laboratory


Powered by Tribepad Talent Acquisition Software

This website is using cookies to improve your browsing experience. If you navigate to another page without changing the settings below you consent to this. Read more about cookies.