Senior Mechanical Engineer - Nuclear

Job Description

Job Title: Senior Mechanical Engineer (Nuclear)

Location: Blackburn or Warrington - currently hybrid working

Duration: Permanent

For 50 years, we've been driven by the firm belief that engineers are the architects of tomorrow's world, leading the way with their daring, their expertise and their ability to push boundaries.
Together with our customers, our 6,000 employees innovate on a daily basis and contribute to accelerating energy transition throughout the world. They support the world's greatest engineering projects in the fields of energy, digital and transport.
A fast-growing international Group, we are present in 13 countries (in Europe, the Middle East, Asia and Africa).

Assystem provide end state focused nuclear engineering services both individually and as part of an integrated design community the largest nuclear design house in Europe - delivering major projects, infrastructure, waste, fuel management and safety case solutions. This mission is critical to the upkeep of the UK's long term nuclear infrastructure.

Join us and develop your career alongside a dedicated, delivery focussed, world class engineering team.

Job Title: Senior Mechanical Engineer (Nuclear)


Location: Blackburn or Warrington currently hybrid working


Duration: Permanent


Assystem are an Award-Winning International Engineering Design Consultancy with a global coverage who provide innovative and cutting-edge solutions to the nuclear sector. We are at the forefront of the #netzero challenge to create a robust energy mix and meet the UKs carbon zero targets.
As our reputation for proficient delivery of complex projects grows even stronger, we have a need for a Senior Mechanical Engineer to work on one of our major infrastructure projects based from either Blackburn or Warrington.

The Role: Senior Mechanical Engineer - Piping

As our Mechanical Senior Engineer you will lead the production of several piping and associated mechanical equipment design packages at once across the portfolio, managing efficient delivery and performance to the expected costs and schedules with minimal supervision from the Responsible Engineer.

Specific responsibilities:

  • Produce or check the required design drawings and documentation for the appropriate base deliverables at all applicable stages of project design development.
  • When varying task complexity and costs necessitate, be capable of leading a small team of designers through delivery of a package or at other times be capable and willing to originate a package individually.
  • Capable of performing plant configuration walk downs in order to confirm and accurately record task baseline details, propose outline schemes, produce basis of design documents and build estimates.
  • Capable of determining Engineering Requirements and provide underpinning for their Validation and Verification.
  • Capable of seeking, deploying and disseminating LFE as appropriate for the design tasks.
  • Capable of professionally representing the design team within the supply chain including technical evaluation of bids & attendance at build customer acceptance tests as delegated by the Responsible Engineer.
  • Continuously producing a high standard of quality documentation, drawings, and project deliverables.
  • At necessary lifecycle points and via appropriate project controls be capable of performing the design interfaces with other project disciplines, having an awareness of the basic project management fundamentals.
  • Providing a confident, clear and professional presentation of the tasks Mech design deliverables to all project stakeholders attending single and / or multidiscipline design reviews.


A full job specification is available with all responsibilities.

Your background:

You'll be able to demonstrate understanding of the main laws and regulations that affect the safety, design and operation of plant and equipment including, Nuclear Installations Act & Site Licence Conditions, Health & Safety at Work Act and various regulations including Safety of Machinery, CDM, LOLER, Pressure Systems, DSEAR, Ionising Radiation, Piping design codes (ASME B31.3)

Also you will be able to demonstrate successful development of piping design deliverables in a brownfield environment from concept / Front End Engineering Design through to installation and client hand over.

Ideally you have done the Check & Approve Work Course D03770 and/or the Design Change Course D03760

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 security clearance if not already security cleared to a minimum SC level.

At Assystem, everyone holds the reins for their own careers. Our role is to offer you the opportunities and resources you need to reach your full potential.

So why not join us and help shape the engineering landscape of the future?
We are committed to providing equal opportunities for every candidate and we celebrate all forms of diversity. At Assystem, only your skills matter!