Senior Criticality Consultant (3B Lower)
National Nuclear Labs · Lea Town, England
Senior Criticality Consultant (3B Lower) at National Nuclear Labs, based in Lea Town, England, paying £69,047 per annum. This is a permanent role.
- Salary
- £69,047 per annum
- Location
- Lea Town, England
- Contract
- Permanent
- Posted
- 4 days ago
- Closes
- 12 Oct 2026
- Sector
- Cleaner
About 138% above the going rate for cleaner
Reference 25ff7faf4dbe44b177972bce66cf6eb543a7366c
About the role
Job Description for Senior Criticality Consultant:
This is where your skills play a critical role in keeping everyone safe. Working in Safety, Security & Safeguards gives you the chance to make your mark on some hugely interesting projects. UKNNL does work that nobody else in the sector is doing, and this means we need experts like you to make it possible, whilst keeping everyone safe. We’re committed to using nuclear science to benefit society for years to come. This means that you can build a long and successful career here whilst playing a meaningful role in delivering cleaner energy, reducing waste and keeping colleagues and the public out of harm’s way.
As the UK nuclear industry is undergoing a resurgence there is an increasing focus on the delivery of new developments, from advanced modular reactors, clean energy, nuclear medicine, new fuel types, new reprocessing processes as well as the need for support of the existing sites and processes, including decommissioning. UKNNL is at the forefront of many of these developments, particularly with its four Focus Areas, and as a result needs to maintain a position at the forefront of developments in criticality safety assessment. The criticality team at UKNNL provides criticality safety advice and assessment for our own activities as well as for a number of customers across different licensed sites.
UKNNL are looking for a dedicated criticality specialist to take on the technical leadership of Criticality Safety Assessment within UKNNL and the development of UKNNL’s capability in this area to support our own facilities, our Focus Areas and current and future customers. This will involve liaison and collaboration with customers and other organisations as well as the development and oversight of the activities under the Core Science Theme. You will also enhance technical skills within the Criticality area and support development of team member's skills and capability and lead activities in support of the development of UKNNL's reputation in the criticality area.
We are looking for a driven individual to lead these developments and realise the opportunities for UKNNL and its customers. The role will involve:
- Building a wide range of relationships from safety, technical and delivery teams in UKNNL, the UKNNL Focus Area leads, customers and external specialists in the field of criticality safety
- The shaping, guiding, and reviewing of the technical delivery of projects to ensure they achieve agreed objectives.
- Leading the development of any relevant technology and the capability and skills of safety assessors.
- The development and acceptance of any methodologies, processes or standards required for this evolving discipline.
- Representing UKNNL on relevant national and international forums.
- Understanding of the stakeholders within UKNNL, its customers, regulators and beyond.
You will have experience that gives examples of how you have successfully delivered to the required time, cost, and quality meeting the customer expectations. You will already have networks in place that put you on a national stage and will allow you to develop UKNNL’s reputation.
At UKNNL we support working flexibly, can accommodate homeworking, and can be flexible about location, although some travel will be necessary, to support business needs.
The location for this role is flexible and can be based at Preston, Sellafield, Risley or Workington.
Main Responsibilities for Senior Criticality Consultant:
- Providing technical lead delivery of projects in the criticality area to time, cost, quality, value and service requirements (working independently). Customers may include any UK civil or defence nuclear facility or operator (including UKNNL laboratories). Accountabilities include:
- Direction and supervision of other criticality consultants
- Management of relationships with internal and external stakeholders
- Advice, training and independent inspection
- Managing UKNNL’s criticality support consultancy to external customers.
- Provide expert knowledge of criticality safety assessment including being up to date with developments in methodology and approach. National level subject matter expert.
- Managing criticality support to multi-disciplinary teams addressing safety challenges.
- Identifying and developing new opportunities for the team, including technical support to bids.
- Use initiative to develop new capabilities through innovative approaches and providing insight. Technical lead on complex IR&D projects and submissions.
- Maintain technical awareness of both UKNNL and external competitors’ capabilities within the broader criticality safety area. Identify best practice to improve the team.
- Developing team SQEP skills for Criticality, e.g., mentoring and supervision. Design and deliver specialist criticality training.
- Membership of relevant national industry groups to represent UKNNL.
Essential Criteria for Senior Criticality Consultant:
- Degree qualified or equivalent level of demonstrable technical capability.
- SQEP 3 with demonstrable experience in criticality safety.
- Excellent level of knowledge in the specialised field of criticality safety assessment. Detailed knowledge of advanced assessment techniques.
- Proven ability to act independently, under own initiative, while supervising other members of the team.
- Strong communication skills, including multi-site working.
- Excellent teamworking skills, with ability to inspire the work of a team.
- Experienced in mentoring and developing technical skills.
- Excellent networking skills, maintaining network across the criticality field nationally.
- Ability to obtain SC level security clearance (this includes but is not limited to identity, employment, financial and criminal record checks plus 5 years’ worth of UK residency).
Desirable Criteria for Senior Criticality Consultant:
- Preferably Chartered Membership of a professional institution or working towards this qualification.
Why join us?
UKNNL isn’t just a place where you can do career-defining work that makes a real-world impact. It’s also a place where you’ll feel appreciated and valued. We’re creating an inclusive workplace where everyone is free to be themselves and feel like they belong. We put your wellbeing first, we push you to reach your potential, and we do everything possible to help you feel safe, supported and inspired.
We also offer a range of employee benefits:
- Sector leading Family-Focused Policies: celebrate life events, including enhanced maternity and paternity leave and a week off for your marriage.
- UKNNL offers attractive pension plans. If you contribute 5%, UKNNL contributes 15%. Alternatively, if you choose not to contribute (0%), UKNNL will still contribute 10%.
- Annual Leave: Benefit from 25.5 days of leave, plus 4 extra days to be taken during Christmas shutdown, plus Bank Holidays.
- Reduced gym membership with discounts of up to 25% from 3,700 gym and leisure providers across the UK
- Company Bonus: Be rewarded for your contributions.
- Learning Opportunities: Enhance your skills through excellent development programmes.
- Employee Assistance: Access support for personal and professional challenges.
- Cycle to Work: Stay active and eco-friendly.
- Life Assurance: Ensure peace of mind for you and your loved ones.
- Enhanced Sick Pay Benefits: Receive support during illness or injury.
- Access to ‘Mydiscounts’ which has a range of special offers and discounts from more than 200 suppliers, includi
Reference: 25ff7faf4dbe44b177972bce66cf6eb543a7366c · Posted 4 days ago · Closes 12 Oct 2026 · Listed via National Nuclear Labs
Apply for this job
This role is listed via National Nuclear Labs. Applications are handled on the employer's site.
Apply on employer siteOpens the employer's website in a new tab.
Safe applying: a genuine employer will never ask you to pay for a DBS check, training or equipment, or move you onto WhatsApp before you are hired. If this listing does, report it and do not pay anything.