Senior EC&I Commissioning Engineer; Temporary

Position: Senior EC&I Commissioning Engineer (Temporary – 6.5 Months)
Location: Dunball

Company Description

⚡️💡 About Assystem

At Assystem, our mission is to accelerate the energy transition worldwide. With over 55 years of expertise in highly regulated sectors, our 8,000 Switchers globally deliver cutting-edge engineering and project management solutions. Join us and be part of one of the top three nuclear engineering companies in the world!

🤝 Why Join the Community of Switchers?

As a member of Assystem, you'll be part of a team driving the low-carbon energy future. We’re ranked second globally in nuclear engineering, offering you the chance to work on world-class projects like Hinkley Point

C. Together, we’ll innovate and shape tomorrow’s energy solutions.

Job Description

Job Summary

The Senior Commissioning Dedicated Instrumentation & Controls (I&C) Lead is responsible for leading and coordinating defined I&C commissioning scopes at the client's project, ensuring systems are commissioned safely, compliantly, and in line with nuclear quality, safety, and regulatory requirements.

This is a temporary cover role for approximately 6.5 months, providing leadership continuity during a critical phase of commissioning and start-up. The role acts as the focal point for I&C commissioning across multiple work streams, ensuring alignment with the project's commissioning strategy, nuclear safety culture, and UK regulatory expectations.

Scope of Work

Main Scope (Direct Leadership)

DMIC I&C Commissioning – overall I&C commissioning lead for the DMIC scope
I&C support for Cranes Commissioning – support for commissioning coordination, testing, and handover of crane systems focusing on I&C scope

Mainstreams (Oversight & Integration)

The role provides leadership oversight and integration for the following three I&C mainstreams, each managed by a dedicated scope manager:

I&C representative for Milestone journey to Demin water Plant (covering DMIC scope of Demin Water Plant)
I&C representative for Milestone journey to CETP (coordinating I&C activities)
Lead preparation and commissioning for Hydrogen Detection System
Lead preparation and commissioning for Fire Detection System
Supporting delivery of TAE milestone (temporary I&C systems delivery)
Managing three direct reports:
Commissioning engineer for HVAC I&C scope
Commissioning engineer for Turbine I&C scope
Commissioning engineer for Fire detection and Hydrogen detection scopes

Responsibilities include:

Ensuring interface alignment between all I&C scopes and the wider HPC commissioning programme
Maintaining consistent commissioning methodologies, documentation, and safety standards
Chairing one weekly coordination meeting with each of the three mainstream scope senior commissioning engineers to review progress, risks, interfaces, and readiness

Key Responsibilities

Commissioning Leadership

Lead I&C commissioning activities for DMIC contracts (various cranes, Demin water plant, fire detection, hydrogen detection) in accordance with the project commissioning processes
Plan and sequence commissioning activities to support system handover, energisation, and start-up milestones
Ensure readiness for loop checks, functional testing, cause & effect testing, and integrated system testing
Interface closely with construction, electrical, mechanical, and operations teams

Technical Oversight

Review I&C commissioning procedures, test packs, and vendor documentation for nuclear compliance
Provide technical leadership during I&C testing, fault finding, and issue resolution.
Review of commissioning results following site acceptance test activities for Cranes, hydrogen detection system, etc.
Ensure effective interface management between systems.
Support DCS, PLC, SIS, and field instrumentation commissioning activities.

Nuclear Safety & Regulatory Compliance

Ensure all commissioning activities are executed in line with nuclear safety culture, project quality arrangements, and site procedures
Comply with UK regulatory requirements, including ONR expectations and client governance
Ensure strict adherence to permit-to-work, LOTO, configuration control, and change management processes
Participate in safety reviews, readiness reviews, and regulatory inspections as required

Coordination & Communication

Act as…