Tomas Martin

This PhD project at the University of Bristol focuses on understanding the effects of water chemistry on the operation and maintenance of new small modular reactor (SMR) coolant circuits. SMRs are an emerging class of pressurised water nuclear reactors designed for improved construction efficiency and cost-effectiveness. As these reactors are developed, it is crucial to understand how their materials respond to operational conditions, particularly regarding corrosion processes in the high-pressure, high-temperature water coolant loops. The project will investigate how anticipated SMR water chemistry regimes affect reactor components, such as steam generators, and how subtle changes in water chemistry can significantly impact metal surfaces. Experimental work will use the University of Bristol's autoclave facilities to expose reactor materials to SMR-specific water conditions, followed by advanced microscopy analysis at the Interface Analysis Centre (IAC). The research will combine experimental and modelling approaches to elucidate how water chemistry influences reactor components, the movement of corrosion products, and strategies to optimise coolant circuit performance. The student will be based in the IAC within the School of Physics, benefiting from access to state-of-the-art testing and characterisation facilities, and will be supported by Dr Tomas Martin, Dr Mariia Zimina, and the broader IAC team. The project is embedded in a vibrant research community with strong links to the nuclear industry through the South West Nuclear Hub. Funding is available for home students, covering living expenses at the UKRI rate, tuition fees, and training costs. A limited number of fully-funded places are available for outstanding international candidates, while others may need to secure additional funding. Applicants should have a first degree in physics or a related subject (minimum UK upper second-class honours or equivalent), and meet English language requirements (Profile F). The application process requires a CV, personal statement, and transcripts, with applications submitted via the University of Bristol's online system. The deadline for applications is 19 January 2026. The School of Physics is committed to diversity and equality, encouraging applications from under-represented groups.

This PhD project at the University of Bristol's School of Physics focuses on the behaviour of structural materials in high temperature helium environments, specifically for advanced gas-cooled nuclear reactors (HTGRs). HTGRs are a promising technology for safe, efficient energy production and industrial decarbonisation, but present significant materials challenges due to the effects of high temperature helium and gas impurities on reactor components. The research will use a custom high temperature rig and advanced microscopy techniques—including focused ion beam, X-ray photoemission spectroscopy, and atom probe tomography—to study the evolution and degradation of structural materials such as nickel-based alloys and steels. The project aims to understand complex degradation processes like carburisation, decarburisation, oxidation, and creep cavitation, and to identify optimal materials and conditions for future HTGRs. The student will be based in the Interface Analysis Centre, gaining access to state-of-the-art analytical facilities and training in microscopy, image processing, and computational modelling. The research group is large and supportive, offering opportunities for collaboration within Bristol and the wider nuclear materials community. The University of Bristol is highly ranked globally and provides a vibrant graduate research community, comprehensive induction, skills training, and career support. Scholarships for home students cover living expenses, tuition, and training; a small number of fully-funded places are available for outstanding international candidates, with external funding also accepted. Applicants need a strong background in physics or a related field, and must meet English language requirements. The application deadline is 19 January 2026. For more information, contact Dr Tomas Martin or the Bristol Physics Graduate School.