Plant Modifications Proposal Manager

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 mobilises 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

Role Purpose

The Lead PMP Manager is responsible for the leadership, coordination, and governance of Plant Modification Proposals (PMPs), ensuring modifications to plant and processes are controlled, safe, and compliant with Site Licence Conditions and SLP 1.02.14 requirements. The role leads PMP delivery from initiation through to closeout, ensuring effective stakeholder engagement, integration with project controls, and adherence to safety, environmental, and design intent requirements. The successful candidate will oversee other PMP Managers delivering PMPs and will also deliver PMPs themselves — this is not solely an “authoring” role.

Key Responsibilities

• Leadership & Management
  • Lead and coordinate PMP Managers and support personnel where required.
  • Provide direction on PMP prioritisation, workload, and lifecycle management.
  • Ensure alignment with organisational governance, safety case requirements, and modification control processes.
  • Act as the senior interface for PMP-related matters within projects, programmes, and the OU.
• PMP Lifecycle Management
  • Manage PMPs through their full lifecycle:
  • Authoring
  • Internal review
  • Committee presentation and endorsement
  • Implementation oversight
  • Handover to operations
  • Closeout
  • Ensure timely and compliant progression of all PMPs in line with site procedures.
  • Maintain a structured PMP tracker and monitor progress against key milestones.
  • Ensure effective preparation, implementation, and closeout of plant modifications with appropriate stakeholder engagement throughout.
• Governance & Compliance
  • Ensure compliance with:
  • Site Licence Condition 22 (control of modifications)
  • SLP 1.02.14 (Modification or experiment on existing plant)
  • Conduct internal PMP reviews to ensure quality and completeness prior to submission.
  • Ensure all required assessments, documentation, and SME inputs are captured.
  • Support and ensure adherence to Configuration Change Control (CCC) process requirements.
• Stakeholder & Interface Management
  • Engage with Subject Matter Experts (SMEs) across engineering, safety case, environmental, and operations to support PMP development.
  • Interface closely with:
  • PMP Coordinator
  • Project Managers and Construction Teams
  • Design and Engineering teams
  • Operations and Safety Case representatives
  • Lead and present PMPs at committee and governance meetings.
  • Demonstrate effective engagement with SMEs when specialist input is required.
• Planning, Reporting & Controls
  • Attend:
  • Weekly construction, design, and project meetings
  • Lead weekly PMP team meetings (tracker updates)
  • Lead weekly reporting meetings with line management
  • Monthly PMP governance / presentation meetings
  • Lead monthly planning meetings to update P6 programme
  • Ensure PMP activities are reflected within the P6 schedule and aligned with project milestones.
  • Provide clear status reporting, risk visibility, and recovery actions where required.
• Risk, Safety & Assurance
  • Ensure all modifications consider:
  • Safety case implications
  • Environmental impacts
  • Design intent and plant performance
  • Identify and escalate risks associated with plant modifications.
  • Ensure safe implementation of modifications with no adverse impact on operations.

Key Skills & Competencies

• Strong knowledge of PMP process and governance
• Understanding of nuclear / regulated environment compliance
• Experience managing plant modification lifecycle
• Strong stakeholder engagement and communication skills
• Ability to interpret safety case and engineering requirements
• Competence in planning tools (e.g. P6)
• Leadership and team coordination capability
• Attention to detail and assurance mindset

Qualifications & Training Requirements

Essential

• Demonstrated experience in PMP management
• Completion of PMP-related training:
• PMP Awareness (EL0114)
• PMP Management & Categorisation (S0751F)
• PMP Manager Training (MG0422)
• Environmental Awareness (EL0160)
• COMAH Awareness (FB0060)

Additional Requirements

• Evidence of completing Configuration Change Control (CCC) e-learning
• Proven attendance and presentation at PMP committees
• Demonstrated experience managing PMP closeout
• Competence assessed through SQEP process with periodic reassessment
• Experience in successfully passing a PMP SQEP interview

Key Accountabilities

• Safe and compliant delivery of plant modifications
• Effective lifecycle management of all assigned PMPs
• Quality and completeness of PMP documentation and reviews
• Stakeholder engagement and SME coordination
• Adherence to governance and modification control processes

Behavioural Expectations

• Proactive and structured approach to delivery
• Strong ownership and accountability
• Collaborative approach with effective stakeholder engagement
• Demonstrates sound judgement and escalation where required
• Operates within defined limits of authority and competence

Whilst we encourage applications from all nationalities, Assystem within the UK are subject to security and export control restrictions due to the nature of work to be undertaken. These restrictions mean that factors including your nationality, any previous nationalities you have held, and/or your place of birth may limit those roles that you can perform for the organisation.

NOTICE TO CANDIDATES ON RECRUITMENT FRAUD – We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter! Bring your unique contributions and help us shape the future.