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Senior Criticality Safety Assessor

Berkshire, UK
£52000 - £75000 per annum
Posting live until
14 Jun 2024

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Job Details


Join AWE in the UK's largest Criticality Safety Group to support safe nuclear operations in defence of the nation and develop your nuclear career!

We are currently looking to expand our Criticality Safety Group and are seeking Senior Criticality Safety Assessors and Principal Criticality Safety Assessors to join us and apply their experience to our complex and challenging mission. We strive to have such a friendly and supportive group to welcome experienced individuals and to help them build a career that is both rewarding and technically stimulating.

Our goal is to grow our internationally recognised, highly capable, friendly, and supportive group to meet the increasing demands of a challenging programme of work in support of the UK's nuclear deterrent.

Location: Aldermaston, West Berkshire. We are located between Reading and Basingstoke.

Although flexible working is available, due to the classified nature of this role, it is anticipated that the successful candidate will spend the vast majority of their time working on site at AWE Aldermaston, once obtaining the appropriate clearance.


  • Senior Criticality Safety Assessor: from £52,000 (depending on suitability and experience) plus allowances;
  • Principal Criticality Safety Assessor: from £65,000 (depending on suitability and experience) plus allowances.

A relocation package may be available - terms and conditions apply.

Closing Date: 14th June 2024

The Roles

As AWE's Criticality Safety Group, our role is to provide an in-house criticality safety assessment capability in support of delivering the company's strategic objectives. This involves the delivery of criticality safety assessments during the design, operation, and decommissioning phases of nuclear facilities, which form a part of our nuclear safety documentation that satisfies our Nuclear Site Licence Conditions.

Senior Criticality Safety Assessor:

As a Senior Criticality Safety Assessor, you will be expected to provide leadership within an area of our capability delivery and act as an advisor to operational facilities and new build programmes. The role provides an important function to coach and mentor junior members of the team as well as perform peer review of assessments.

Opportunities for being part of an emergency response capability also exist.

Principal Criticality Safety Assessor:

Our Principal Criticality Safety Assessors act as Subject Matter Experts, pivotal in the provision of criticality safety assessments/determinations and specialised expert support relating to large scale Metallurgical Processing Facilities and Operations, Assembly/Disassembly Operations, Decommissioning Operations, Transport, Trials and Nuclear Threat Response requirements.

Key Accountabilities & Responsibilities:

  • Leading the technical approval of criticality safety assessments;
  • Set the criticality safety assessment strategy for modifications and new build activities;
  • Provide lead technical criticality safety support and advice to the facility, operational or project management teams, influencing as necessary;
  • Leading the technical delivery of critical safety tasking supporting the company fissile material operations
  • Lead, coach and mentor members of the team ;
  • Maintain and improve AWEs suite of company management arrangements for criticality safety that reflect relevant good practice and modern standards. Engaging with other UK and international experts to do so;
  • Support external activities, as required, as part of the Critical Safety Authority Outreach and Science Programme. Representing AWE at UK and international conferences;
  • Nuclear Baseline Role: Directly Supporting Work with Nuclear Materials and engaging with other Safety Assessment Specialists in support of a common goal;
  • The Company may require you to fulfil any other reasonable duties aligned to your position from time to time in line with business needs.

What will you need to be considered?

  • Honours Degree (or equivalent) in science, engineering or closely related discipline or equivalent level of experience;
  • Understanding of nuclear physics, physics of criticality, chemistry, and metallurgy of fissile material;
  • Detailed knowledge of criticality safety assessment techniques and principles;
  • Detailed knowledge of the regulatory requirements of fissile operations within a Nuclear Licensed Site;
  • A practitioner who can demonstrate good engineering and scientific judgement with experience in using fundamental engineering and scientific skills;
  • Knowledge of nuclear transport codes - Monte Carlo and deterministic methods e.g., MONK and MCNP;
  • Experience in methodologies used in criticality safety and an overview of the different regulatory methods outside the UK;
  • A portfolio of experience in delivering criticality safety assessments and evidence of leadership/influence, or being ready for leadership, in the field Demonstrate leadership in the field of criticality safety, providing influence and impact;
  • Good understanding of the requirements and process for the development of a nuclear safety case;
  • Ability to establish strong working relationships with key stakeholders including technology centres, operational and project management, engineers, and safety case teams;
  • Ability to articulate and communicate clearly and concisely technical programmes, problems, and risks to internal and external stakeholders with non / technical backgrounds Report and presentation skills;
  • Experience in a nuclear, high hazard and/or highly regulated industry;
  • Professional membership to a relevant chartered body (desirable).

What will you get from us?

As part of our People Promise, AWE (one of the best 25 big companies to work for in the UK) has a range of benefits to suit you. These include:

  • Time to recharge your batteries with 270 hours of annual leave (including Bank Holidays);
  • 9-day working fortnight - our employees have every other Friday off work;
  • Flexible working hours;
  • Consideration for flexible working arrangements so that your work may fit in with your lifestyle. Just let us know on your application if you wish to work part time;
  • Family friendly policies: Maternity Leave - 39 Weeks Full Pay and Paternity Leave - 4 Weeks Full Pay;
  • Opportunities for Professional Career Development that include funding for the annual membership of a relevant professional body, access to mentors and training;
  • Employee Assistance Programme and Occupational Health Services;
  • A market leading contributory pension scheme (we will pay between 9% and 13% of your pensionable pay depending on your own contribution);
  • Life Assurance;
  • Discounts - access to savings on a wide range of everyday spending savings;
  • Special Leave Policy including paid time off for volunteering, public service (including reserve forces) and caring for your family;
  • A host of voluntary & core benefits to suit your health and wellbeing - more information available on our careers site.

Important things you need to know:

  • You must be a UK national who has been resident in the UK for the past 10 years;
  • Interviews will be 90 minutes in length and will be held over Microsoft Teams. You will be required to prepare a 10-minute presentation in advance;
  • Candidates must be willing and able to obtain and maintain the necessary security clearance for the role. This will be funded by AWE.


* Agencies: Please note that we do not out-source our recruitment


AWE profile image

AWE plays a crucial role in national nuclear security. Working to support the defence of our country, we’re a community of creative thinkers from all kinds of backgrounds in all kinds of roles, with one clear mission – to keep everyone, our environment and everything around us safe and secure. Our role in nuclear defence and the specialist expertise we provide to the government, is vital in the defence against the most serious threats faced by the UK – and to keeping the peace. From developing the warheads for the nuclear deterrent, to providing counter-terrorism and nuclear threat reduction solutions, the work we do is of global importance.

Why work for us
What we do is unique and so are the people who work here. We are a team of around 6500 people – proud to be part of such an important mission. We are com​mitted to equality at work and to mainstreaming diversity and inclusion in everything we do. We believe that by bringing together a diverse range of people we’ll get the diversity of thought to approach challenges in new ways.

Training and development
We believe in supporting our people through long-term investment in learning and development. Alongside in-house and on-line training capabilities, we support membership of professional bodies. We also focus on building and developing leadership skills, in pursuit of our best-in-class ambition. We do this through tailored leadership development programmes, accredited by the Chartered Management Institute, designed to equip our leaders with the skills to drive performance and bring out the best in their teams.

Graduate schemes
Our two-year Evolve programme offers four career pathways: Science, Engineering, Environment, Safety, Health & Quality and Corporate & Operations. The programme is designed to be flexible, to incorporate a range of experiences as well as business needs. You’ll undertake several placements to expand your knowledge of your discipline, enabling you to develop yourself and your ongoing career. Your line manager will work with you and support you on your journey.

What we are looking for
We are always looking for high-calibre people to join our team. Whatever stage of your career, AWE is an exciting and challenging environment to develop your skills and achieve your potential. Our ambition is to create workplaces where we recognize and celebrate differences, encourage diverse contributions and our employees feel able to be themselves at work. We strive to create a genuine culture of openness and inclusion and encourage diverse applicants. Please note that you must be a British national to apply for a role at AWE.

Reading, UK

Number of employees

Main areas of research
Nuclear defence, nuclear forensics, radiation detection, plasma physics, hydrodynamics, high-performance computing, materials science

Positions recently recruited for
Computational physics, criticality scientists, experimental physics, radiation science, high-performance computing, radiation detection

Must be a British national and have resided in the UK for 10 years for our science and engineering roles 

How to apply
Please visit our website for further information

Tel +44 (0)118 981 4111

Company info
+44 0118 98 24643
AWE Aldermaston

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