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/ Radiation Shielding / Fusion / 

What is Fusion?

Fusion is a process where two very light atoms join together to form a heavier atom. The reduced mass of the resultant particle releases energy according to Einstein’s theory of relativity. Fusion is not a natural process on Earth, the fuel needs to be heated to very high temperatures in order to cause collisions, and although many fusion experiments have taken place, none have (as yet) achieved a net power gain.

Our Capability

Fusion shielding design is a specialist capability and Cerberus Nuclear have one of the most experienced teams in the UK. We have a proven track record supporting large scale projects as well as smaller commercial enterprises.

Fusion shielding presents a unique challenge because of the extreme conditions, such as high temperatures and high neutron energies, under which the materials need to operate. Shielding within a fusion reactor needs to protect complex and expensive components as well as operators and the public.
We use MCNP, SCALE, PHITS, OpenMC and in-house software combined with our high-powered computer cluster to perform our calculations.
• Neutronics design and analysis
• Bioshield design
• Activation analysis
• Shielding optimisation
• Dose assessments

Case Study 1
Shielding Optimisation

Cerberus Nuclear completed complex multi-layered shielding optimisation for the shielding of a spherical tokomak. This work involved the design and modelling of shielding layers comprised of various materials. Preliminary scoping calculations identified patterns in shielding designs allowing a short list of materials to be used in the final optimisation stage. A bespoke genetic algorithm combined with Cerberus Nuclear’s in-house software, Cyclone™, was used to optimise heating.

Due to the number of degrees of freedom running all possible combinations was not feasible, as a result, a genetic algorithm approach was used. A total of 50,000 different cases were executed on Cerberus Nuclear’s computer cluster with the genetic algorithm converging on the optimum material arrangement to minimise heating. 

Case Study 2
Design of a Neutron Shield Components: Reactor Bioshield Design

Cerberus Nuclear has provided radiation shielding support to a spherical tokamak design. We provided radiation transport and shielding assessments for both deuterium gas (D-D) and deuterium - tritium (D-T) campaigns. This involved optioneering modelling for complex bioshield designs for the walls and roof of the shielding enclosure, intended to ensure adequate shielding around the reactor for both campaigns whilst simultaneously ensuring that constraints of weight and space were adhered to.

These calculations accounted for neutrons, gammas and secondary particle generation, for both D-D and D-T shot schedules. This work was performed primarily using MCNP, with SCALE used to provide independent cross-checks of the results, and looked at the contributions of skyshine in addition to the direct radiation contributions through the bioshield walls and roof.

Other Radiation Shielding Specialisms

civil nuclear & defense

New Build
Plant Modifications
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Linac Bunkers
Proton Therapy
X-ray Shielding
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high energy

Beam Lines
X-ray facilities
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Sealed source testing
Betatron testing
LiDAR scanning
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Fusion news

Cerberus Nuclear at SOFE 2023
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Cerberus Nuclear Sponsor YGN Shielding and Criticality Event
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Successful Neutronics Workshop at the University of York
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UKAEA Fusion - STEP Reactor Shielding Design
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 Industry memberships and collaborative organisations

radiation shielding  |  criticality safety  |  nuclear characterisation  |  software development


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