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About

Our mission is to provide high quality technical solutions with an emphasis on creativity and innovation. We achieve this by being an exemplary employer of talented individuals.

history

Cerberus Nuclear was founded in late 2016 and began trading in February 2017. Craig, Dan and Stewart had worked for various nuclear licenced sites, consultancies and as self-employed contractors and wanted to create a consultancy that would go about things in a different way – one that specialised in its chosen fields, was client focussed, and was a great place to work, but also one that genuinely invested in and encouraged research and development.

Tom Page joined the company as a 4th director in April 2018, closely followed by our first employee, Carl Hughes in October 2018. Since then, the company has grown steadily. As well as attracting experienced assessors, graduate recruitment has played a key role in the growth of the company.
In 2020 we introduced an Enterprise Management Incentive (EMI) scheme, which rewarded our employees with shares in Cerberus, making us an ‘employee owned’ company.

Our timeline

meet the team

As a consultancy, our team are our main asset. Our talented bunch of employees make the company what it is. Furthermore, we have a growing pool of part-time employees and associates, including very experienced consultants and internationally recognised experts in their field.

Directors

Craig Holland

Director
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Craig Holland
Director

Craig is a criticality safety and radiation shielding assessor with over 13 years’ experience working on multiple client sites where he has supported the production of safety cases at various stages of the design process including long-term periodic reviews and new build.

Craig specialises in technical safety assessment and is experienced in the use of multiple analytical methods for criticality and shielding assessment, including utilisation of the computer codes: MONK and MCNP. He has particular experience in the production of Criticality Warning System (CWS) placement and criticality dose contour studies.

Craig has been a director of Cerberus Nuclear since its inception in 2016.

Tom Page

Director
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Tom Page
Director

Tom is a chartered physicist with a PhD in Nuclear Physics and nearly 20 years experience as a technical specialist in the nuclear industry.  He is a director of Cerberus Nuclear and joined the company in 2018. Tom has a proven ability in leadership of teams engaged in technical work on a wide variety of projects and has applied principles from his APMP project management qualification and the Sellafield Ltd Leadership Academy to consistently deliver work to time and cost.

Tom began his career as a graduate criticality safety assessor for a major defence organisation in the UK, where he worked on fissile material systems, becoming an expert user of the MONK criticality code.  Subsequently, Tom moved into consultancy, gaining 8 years experience as a principal consultant in both criticality safety assessment and radiation shielding, where he made extensive use of MCNP.  Following this Tom moved to Sellafield Ltd, whereupon after successfully leading a characterisation and modelling team on-site at Sellafield for four years he then joined Cerberus Nuclear as a director in 2018.

Based in Chester, Tom represents the company at the British Energy Coast Business Cluster (BECBC).

Stewart Hay

Director
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Stewart Hay
Director

Stewart is a chartered physicist with over 13 years’ professional experience as a criticality safety and radiation shielding assessor. He has worked across the UK nuclear industry with long-term secondments to a number of key clients. This has involved working with other safety disciplines, design engineers, plant management and regulators to achieve fit for purpose designs and processes.

He is an experienced user of various computer codes including MCNP, SCALE, MONK, ATTILA and MCBEND, and has produced validation and verification documentation for a number of clients.

Stewart has been a director of Cerberus Nuclear since its inception in 2016 and represents the company at the UK Working Party on Criticality (WPC).

Daniel Cork

Director
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Daniel Cork
Director

Dan is the radiation shielding team lead for Cerberus Nuclear.

He has over 10 years’ experience in radiation shielding design, classification of areas and dose uptake assessments and has worked many for clients across the UK and abroad. He has provided independent technical advice regarding radiation safety issues as well as peer review support. Dan is highly experienced in the use of radiation transport codes such as MCNP, SCALE as well as ATTILA and provides training and development in Monte Carlo and deterministic methods.

Dan has previously been the chair for the UK Shielding Forum (TSF) which is a UK authority for shielding principles, methodologies and core skill requirements for the nuclear industry.

https://www.shieldingforum.com

Senior Team

Barrie Greenhalgh

Principal Consultant
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Barrie Greenhalgh
Principal Consultant
Nuclear Characterisation

Dr Barrie Greenhalgh is a Radiometric and Nuclear Physicist with over 18 years’ experience of working in the nuclear industry. He is a MCNP radiation transport specialist, with experience in support of radiometric characterisation, calibration, feasibility and design studies. Until recently, he delivered technical characterisation tasks for a range of Sellafield Ltd customers, including POCO, remediation and plant support operations. At Sellafield, Barrie was the lead physicist for the Radiometric Systems Group for the use of MCNP, and has performed an Intelligent Customer role for contractor supplied specialist services.

Barrie has proven project management ability across a complex range of work packages, and has delivered projects through the full lifecycle from specification to delivery in radiometric characterisation. He is also highly skilled in the field of Nuclear Material/Non-Destructive Assay (NMA/NDA), and has worked with ionising radiation detectors for over 25 years. As well as bring a key member of our Nuclear Characterisation team, Barrie will be supporting the Criticality Safety team at Cerberus Nuclear.

Emily McManus

Commercial Manager
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Emily McManus
Commercial Manager

Emily is the Business and Commercial Strategy Lead at Cerberus Nuclear, providing business development and management support for the company. Her responsibilities include pursuing new business opportunities, and bid writing and management. Since starting with the company she has also been involved in the implementation of the Business Management System (ISO9001, 14001 & 45001), for which Cerberus Nuclear has been UKAS Accredited.

Emily is also an experienced radiation shielding assessor with over 6 years’ experience. She was a SQEP 3 assessor for Sellafield Ltd and has worked on a range of decommissioning and new build projects supporting safety, engineering and design teams. Highly proficient in radiation transport codes such as MCNP, MCBEND and RANKERN, she has produced key documents in line with the Shielding Design Process including Shielding Design Basis, Classification of Areas, Bulk Shielding, Detailed Design support, Dose Assessment as well as CID Placement Assessments.

Commercial email: nuclear@cerberusnuclear.com
Telephone: +44(0)1925 357311

Toby Tyas

Principal Consultant
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Toby Tyas
Principal Consultant
Criticality Safety

Toby is a criticality and shielding assessor with over 8 years’ experience as a consultant in the nuclear industry.  He has a great deal of experience in decommissioning criticality safety having delivered assessments for a number of high-profile decommissioning projects in the UK.

He is proficient in the use of MCNP and MONK for criticality safety and is a knowledgeable user of Visual Basic. Toby is also a skilled trainer and mentor, drawing on his experience from a previous career as a schoolteacher.

Toby represents Cerberus Nuclear at the UK Working Party on Criticality (WPC).

Pete Evans

Principal Consultant
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Pete Evans
Principal Consultant
Radiation Shielding

Peter is a technical specialist in the field of radiation shielding and dose assessment with over 10 years’ experience. He has provided support to safety, engineering and design teams for a variety of new build, operational plant and decommissioning projects on the Sellafield site, including managing the delivery of shielding support on high-profile projects such as the SIXEP Contingency Plant, BEPPS-DIF & Silos Direct Encapsulation Plant. He is highly experienced in the use of radiation transport codes such as MCBEND, Attila, MCNP & RANKERN. In addition to the above, he has mentored junior members of staff and has delivered a large number of radiation shielding training courses.

Carl Hughes

Principal Consultant
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Carl Hughes
Principal Consultant
Software Development

A physics graduate with over 10 years’ experience as a technical specialist.  Carl is a Sellafield SQEP Grade 3 radiation shielding assessor who specialises in radiation transport assessments, gamma and neutron shielding assessments, dose uptake assessments and classification of areas. He has significant experience with licensing and regulatory requirements for the transport of radioactive materials within Type A, Type B and Industrial Package (IP) radiation transport containers.

Carl is highly experienced in the use of radiation transport codes such as ATTILA, MCNP, MCBEND and SCALE as well as nuclear inventory codes such as FISPIN and ORIGEN. He is also an experienced software developer, producing a number of applications, primarily using Python.

Consultants

John Billingsley

Consultant
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John Billingsley
Consultant

John is a shielding consultant for Cerberus Nuclear. Prior to working for Cerberus, he was a nuclear analyst for UKAEA where for the past 2 years he was involved in the STEP programme using Open MC neutronics simulations to analyse tritium breeding ratios. During this time, he has gained experience with CSG- and CAD-based neutronics calculations, and methods of automated data analysis using Python scripting. Alongside his neutronics experience, John has extensively contributed to software development and to the open-source Monte Carlo code OpenMC. He also has experience in delivering training on neutronics PhD students at the University of York as part of the EPSRC Fusion CDT programme.

Henry Faulkner

Consultant
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Henry Faulkner
Consultant

Henry joined Cerberus following his Summer Placement with the company for his NTEC Masters Dissertation. Henry has gained extensive experience using MCNP to model fissile arrays of barrels containing separated plutonium waste with differing compositions during his summer project. He analysed results using machine learning methods in Python to predict the safest possible arrangement of units. Henry is looking to build upon his knowledge and academic experience in both the shielding and criticality safety teams. In addition to his consultancy work, he is attending shielding and criticality mentoring sessions lead by our experienced team members in line with industry standards. 

Jacob Westerman

Consultant
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Jacob Westerman
Consultant

Jacob completed his summer placement at Cerberus Nuclear for his NTEC Masters dissertation and has since started full time with the company.

Jacob’s summer project included criticality calculations on three distinct fissile systems including a random and uniform heterogeneous system with immiscible liquids. He developed software using Python to generate all MCNP input files. This allowed for quick changes to be made and a range of properties investigated such as enrichment, particulate size and material, volume fraction and moderator material. Jacob is also attending shielding mentoring sessions lead by experienced members of the shielding team in order to further his career as a shielding consultant. 

Katrina Christaki

Consultant
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Katrina Christaki
Consultant

Katrina is a criticality assessor with over two years of experience in the nuclear industry. In this short time, she has worked on a range of projects, from new build to decommissioning as well as in house development work. She has carried out criticality safety assessments in support of a Long-term Periodic Review and is currently working on a criticality assessment for a new build project, providing criticality support to the design team and advancing her experience of integrating into a safety case team.

She has also developed her expertise in criticality codes, using both MONK and MCNP on client projects. Alongside her consultancy roles, Katrina is undertaking structured training sessions in-line with the Working Party on Criticality (WPC) Competency Framework delivered by experienced criticality safety assessors within Cerberus Nuclear.

Katrina is a STEM ambassador and has been awarded the 15 hours of engagement badge.

Sam Hilton

Consultant
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Sam Hilton
Consultant

Sam has two years' experience at Cerberus Nuclear as a nuclear safety consultant specialising in radiation shielding and visualisation of dose information. He has completed various shielding assessments such as beam line activation and detailed design shielding support. Sam also has project experience with both Tokamak Energy and Culham Centre for Fusion Energy in shielding design for spherical tokamaks, providing optimised shielding for radiation damage and heating. He is an advanced user of Monte Carlo codes including MCNP, PHITS, OpenMC and SCALE.

As Cerberus Nuclear's lead VR designer, Sam has worked on our RAPTA and CARTA projects integrating Monte Carlo derived data from both shielding and criticality calculations into immersive environments to intuitively display data. Sam graduated from the NTEC MSc in 2019. He has since produced MSc approved dissertation projects in novel techniques that integrate Python coding with Monte Carlo codes, and shielding and criticality mentorship for our summer placement students completing the projects.

TEAM news

New Starter - Nathan Chambers
We are happy to announce that Nathan Chambers has joined Cerberus Nuclear following a successful summer placement with the company. During his MSc Placement, Nathan performed an investigation into the effect of localised radiation shield weaknesses on the dose uptake of a self-designed phantom model. Nathan has been involved in the latest phase of the […]
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New Starter – Zachary Strangwood
We are pleased to announce that the first new starter of this year’s graduate intake has started with the company. Zachary Strangwood completed his MSc placement with the company this summer. His project consisted of modelling various radiation shielding scenarios with moving sources in MCNP and creating an interpolation engine using Python to calculate mesh […]
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New Starter – Barrie Greenhalgh
We are delighted to welcome Dr Barrie Greenhalgh to Cerberus Nuclear! Barrie is a Radiometric and Nuclear Physicist joining us with 18 years experience in the nuclear industry. He is a MCNP radiation transport specialist, with experience in support of radiometric characterisation, calibration, feasibility and design studies. Until recently, Barrie delivered technical characterisation tasks for […]
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 Industry memberships and collaborative organisations

radiation shielding  |  criticality safety  |  nuclear characterisation  |  software development

accreditations

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