Senior / Principal Modelling Consultant (Nuclear Waste)

Senior / Principal Modelling Consultant (Nuclear Waste)

Join Amentum’s Waste Management & Disposal business to support the safe management and disposal of radioactive waste.

Key Responsibilities

• Deliver desk‑based consultancy projects for UK and international clients, contributing to technical delivery and waste‑management capability.
• Provide technical input across disciplines including groundwater flow and solute transport modelling, radionuclide release assessments, gas and two‑phase flow modelling, and engineered and natural barrier performance over long timescales.
• Lead and coordinate technical work packages or small project teams, ensuring delivery to time, cost and quality requirements.
• Interpret client requirements, develop solutions and coordinate with multidisciplinary teams.
• Support, mentor and develop junior staff, reviewing work and contributing to professional growth.
• Produce high‑quality technical reports and presentations for specialist and non‑specialist audiences.
• Engage in business development activities such as proposal writing and client engagement.

Essential Criteria

• Degree in Earth sciences, physical sciences, engineering or mathematics.
• Experience in development and application of numerical and/or complex environmental models.
• Ability to evaluate complex systems and models, extract safety insights and present findings effectively.
• Excellent written and verbal communication skills, capable of producing clear, accurate technical documentation.
• Strong organisational and project delivery skills, managing competing priorities within time and budget constraints.
• Capability to work autonomously and collaboratively in multidisciplinary teams.
• Problem‑solving ability and a solutions‑focused mindset.
• Commitment to continuous learning and professional development.
• Desire to contribute to the company’s radioactive waste management and decommissioning strategy capability.
• Ability to obtain Baseline Personnel Security Standard (BPSS) clearance.

Additional (Advantageous) Criteria

• Experience with environmental safety case development for radioactive waste disposal facilities.
• Knowledge of UK nuclear regulatory frameworks and repository development programmes.
• Experience developing groundwater flow and solute transport models (near surface and deep underground).
• Familiarity with GoldSim, PHREEQC, COMSOL, PFLOTRAN, Python, MATLAB or similar tools.
• Experience supporting licence applications or regulatory review.
• UK nuclear industry or radioactive waste management sector experience.

Compensation & Benefits

Competitive salary for the role plus benefits including health, dental and vision insurance, paid time off, retirement benefits (including 401(k) matching), educational reimbursement, parental leave, employee share schemes and tax‑saving plans.

Equal Opportunity Statement

Amentum is an Equal Opportunity Employer. We do not discriminate on the basis of race, colour, religion, sex, national origin, age, disability or any other status protected by federal, state or local law. We encourage candidates to apply with the information they can reasonably provide and will provide accommodations when needed.

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