Commissioning Engineer Mechanical

Company: Amentum

Location:

Posted: April 18th, 2026

About the Opportunity

The Box Encapsulation Plant project is one of the most important construction projects at the Sellafield Site. The plant will play a vital role in Sellafield’s 100-year clean-up programme by taking nuclear waste recovered from the site’s original waste plants and encasing it in concrete so it can be stored in a modern building. The plant is primarily designed to deal with waste from the Magnox Swarf Storage Silo, one of four legacy waste plants prioritised for clean-up by Sellafield Ltd’s owner, the Nuclear Decommissioning Authority (NDA). Alongside that work, the plant will also receive certain wastes from the other three legacy waste stores: the First Generation Magnox Storage Pond, the Pile Fuel Storage Pond, and Pile Fuel Cladding Silo.

The BEP Joint Venture project will safely design and deliver a plant and the works in accordance with the requirements of the contract to enable conditioning of wastes from the various donor plants, carried out in line with the Employer’s needs and to the satisfaction of stakeholders in the Box Encapsulation Project (BEP).

The Commissioning Engineer reporting to the Commissioning Team Leader undertakes delivery of assigned commissioning tasks in a safe and effective manner, in line with commissioning process requirements.

This role is specific to candidates with experience in nuclear in-cell handler testing.

Responsibilities

Experience & Qualifications

Compensation Details

GBP

The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

In addition to the benefits you’d expect, UK employees also receive free single medical cover and digital GP service, family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships.

Benefits Overview

Our health and welfare benefits are designed to support you and your priorities. Offerings include:

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Equal Opportunity Employment

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law.

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