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Design, build, and operate a non-nuclear experimental facility to study passive heat removal and water ingress in pebble-bed reactors. Generate validated datasets on heat transfer and pebble behavior under extreme maritime conditions to support reactor safety modeling.
Requires a Master's degree in applied physics, mechanical engineering, or a related field with a strong background in thermal hydraulics. Candidates must demonstrate a passion for experimental laboratory work and the ability to work in multidisciplinary teams.
Investigating Experimental Thermal-Hydraulics in Advanced Nuclear Reactor Technology for Land-based and Maritime Applications
Perform experimental research and develop accurate datasets that help shape the next generation of micro nuclear reactors for land-based and maritime applications. At TU Delft, you will design and operate unique thermo-hydraulic experiments that directly contribute to the safety and deployment of advanced reactor technology. You will work in an interdisciplinary consortium while collaborating closely with a second PhD researcher focused on reactor modelling and safety analysis.
Job description
TU Delft is part of a consortium led by Allseas that is developing a micro High-Temperature Reactor (HTR), being a pebble-bed design, for land-based and maritime applications. Within this project, you will generate experimental data that support reactor safety assessment and model validation.
As a PhD candidate, you will investigate passive heat removal and reactor behavior during water ingress scenarios in the MARLIN pebble-bed reactor concept. You will design, build and operate a non-nuclear experimental facility consisting of a tiltable reactor vessel with heated pebbles and advanced measurement systems.
You will perform experiments that vary pebble power, vessel orientation, water flow and pebble configurations to study heat transfer, natural convection, boiling phenomena and hotspot formation. Experiments will include extreme maritime conditions with vessel inclinations up to 90 degrees.
A second research line focuses on the influence of ship motions such as roll, pitch and heave on pebble-bed behavior. You will develop dedicated experimental setups to measure pebble movement, collision dynamics and local density variations under non-stationary conditions.
The validated datasets you generate will directly support the adjoining PhD project on high-fidelity reactor modelling and safety analysis. Together, both positions contribute to the safe deployment of advanced microreactors.
You will join TU Delft’s nuclear engineering community and have access to state-of-the-art laboratory facilities, international collaborators and doctoral education programmes. The position offers opportunities to develop expertise in thermal hydraulics, experimental methods, reactor safety and nuclear energy technologies.
Job requirements
TU Delft (Delft University of Technology)
Working at TU Delft means contributing to solutions that really make a difference.
For over 180 years, we have been training engineers who make an impact worldwide in companies, government bodies, or as entrepreneurs. Our alumni turn knowledge into concrete solutions for the challenges of today and tomorrow.
These challenges are changing rapidly. That is why we focus on themes such as energy, climate, digitalisation, artificial intelligence (AI), and smart mobility every day. Our education and research are directly aligned with what society needs now and in the future.
At TU Delft, our people make the difference. With their knowledge and curiosity, our staff provide a high-quality education and conduct pioneering research that extends beyond the campus. You will have the opportunity to take the initiative, work with others, and grow as a professional.
Working at TU Delft means join an international community of professionals and students. Together, we create knowledge, innovations, and solutions that help move the world forward.
Faculty Applied Sciences
With more than 1,100 employees, including 150 pioneering principal investigators, as well as a population of about 3,600 passionate students, the Faculty of Applied Sciences is an inspiring scientific ecosystem. Focusing on key enabling technologies, such as quantum- and nanotechnology, photonics, biotechnology, synthetic biology and materials for energy storage and conversion, our faculty aims to provide solutions to important problems of the 21st century. To that end, we educate innovative students in broad Bachelor's and specialist Master's programmes with a strong research component. Our scientists conduct ground-breaking fundamental and applied research in the fields of Life and Health Science & Technology, Nanoscience, Chemical Engineering, Radiation Science & Technology, and Engineering Physics. We are also training the next generation of high school teachers.
Click here to go to the website of the Faculty of Applied Sciences.
Conditions of employment
Doctoral candidates will be offered a 4-year period of employment in principle, but in the form of 2 employment contracts. An initial 1,5 year contract with an official go/no go progress assessment within 15 months. Followed by an additional contract for the remaining 2,5 years assuming everything goes well and performance requirements are met.
Salary and benefits are in accordance with the Collective Labour Agreement for Dutch Universities, increasing from €3059 - €3881 gross per month, from the first year to the fourth year based on a fulltime contract (38 hours), plus 8% holiday allowance and an end-of-year bonus of 8.3%.
As a PhD candidate you will be enrolled in the TU Delft Graduate School. The TU Delft Graduate School provides an inspiring research environment with an excellent team of supervisors, academic staff and a mentor. The Doctoral Education Programme is aimed at developing your transferable, discipline-related and research skills.
The TU Delft offers a customisable compensation package, discounts on health insurance, and a monthly work costs contribution. Flexible work schedules can be arranged.
Will you need to relocate to the Netherlands for this job? TU Delft is committed to make your move as smooth as possible! The HR unit, Coming to Delft Service, offers information on their website to help you prepare your relocation. In addition, Coming to Delft Service organises events to help you settle in the Netherlands, and expand your (social) network in Delft. A Dual Career Programme is available, to support your accompanying partner with their job search in the Netherlands.
Additional information
If you would like more information about this vacancy or the selection procedure, please contact Dr. Martin Rohde, associate professor, via [email protected].
Application procedure
Are you interested in this vacancy? Please apply no later than 20 July 2026 via the application button and upload the following documents:
Please also upload copies of your university degree, transcripts for your BSc and MSc programmes, your MSc thesis and, if applicable, scientific publications. References may be checked as part of the selection procedure.
You can address your application to Dr. Martin Rohde, associate professor.
Doing a PhD at TU Delft requires English proficiency at a certain level to ensure that the candidate is able to communicate and interact well, participate in English-taught Doctoral Education courses, and write scientific articles and a final thesis. For more details please check the Graduate Schools Admission Requirements.
Please note:
TU Delft Campus is a top tech ecosystem accelerating innovation for a better society. A community pioneering for change.
TU Delft Campus is a top tech ecosystem that accelerates innovation for a better society. We are home to over 41.000 researchers, entrepreneurs and students. A community pioneering for change.
Offices: Van der Burghweg 1, Delft, Zuid Holland 2628 CS , NL
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