(SATURN CDT) Mechanistic Influence of Chloride on Magnox Metal Corrosion in Encapsulated Nuclear Waste Products University of Sheffield in United Kingdom

This fully funded PhD project at the University of Sheffield investigates the mechanistic influence of chloride on the corrosion of Magnox metal in encapsulated nuclear waste products. Nuclear power is a key component of the UK's energy strategy, but it generates significant volumes of radioactive waste requiring safe, long-term management. Most of this waste is conditioned by encapsulation in cement, and recent findings indicate that chloride availability within these cement-immobilised packages critically controls the corrosion rate, duration, and behaviour of Magnox metal. Understanding these mechanisms is essential for predicting gas generation, corrosion expansion, and the long-term stability of wasteforms.

The research will employ advanced in-situ characterisation techniques, including surface-specific spectroscopy and microstructural analysis, to study the mass transport of chloride and other constituents within the cement matrix. The project aims to link the chemical and physical properties of grout and waste with the nano/microstructure, mass transport processes, corrosion behaviour, and chemical resistance of the encapsulated system. Both acute and chronic corrosion rates will be measured, with a focus on the relationship between chloride speciation and mass transport. Experimental work will be conducted at both the UK National Nuclear Laboratory and the University of Sheffield laboratories.

The successful candidate will join the Sustainable Materials at Sheffield (SMASH) research group within the School of Chemical, Materials, and Biological Engineering, benefiting from a multidisciplinary environment and world-leading expertise in cement and materials science. The project is part of the EPSRC-supported SATURN Centre for Doctoral Training, a consortium of leading UK universities, and includes industrial supervision from the UK National Nuclear Laboratory and Sellafield Ltd. The doctoral training programme offers comprehensive skills development, leadership training, industry secondments, and opportunities for international collaboration.

Applicants should hold at least an upper second class honours degree in chemical engineering, chemistry, bioscience, or a related technical field. Non-native English speakers must demonstrate proficiency with an IELTS average of 6.5 (minimum 6.0 in each component) or equivalent. The studentship covers tuition fees and provides a tax-free stipend starting at £21,383 per year for four years, with eligibility for UK and EU students meeting residency requirements. Flexible study arrangements may be available. For informal enquiries, contact Dr B Walkley at [email protected].

To apply, complete the Enquiry Form and contact the supervisor to discuss your suitability. Further application details are available on the University of Sheffield website. The programme values diversity and encourages applications from all backgrounds, including those returning from career breaks or seeking flexible study options.