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Pebble dynamics and thermal-fluid analysis of high-temperature gas-cooled pebble bed reactors using DEM and CFD simulations

Kashminder S. Mehta; Braden Goddard; Zeyun Wu

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

This study presents a multiphysics computational simulation framework for analyzing pebble dynamics and thermal-fluid behavior in High-Temperature Gas-Cooled Pebble Bed Reactors (HTG-PBR). The pebble circulation and intermixing effects are predicted using Discrete Element Method (DEM) implemented…

High-fidelity multi-physics guidelines for model validation and uncertainty quantification

Gregory K. Delipei; Quentin Faure; Maria Avramova dkk.

Frontiers in Nuclear Engineering, Vol. 4 · 2026 · Inggris · DOAJ Scopus

The verification, validation, and uncertainty quantification (VVUQ) of high-fidelity, high-resolution multi-physics modeling and simulation in nuclear engineering applications are essential for assessing the predictive credibility of developed models. Appropriate practices and methods are required…

Accelerating the engineering design of breeder blankets with parametric optimisation and sequential learning

Luke Humphrey; Helen Brooks; Siddharth Mungale dkk.

Frontiers in Nuclear Engineering, Vol. 4 · 2026 · Inggris · DOAJ Scopus

The competing requirements of fusion breeder blankets and the high dimensionality of their design space necessitate a systematic treatment to map the variations in performance against given objective metrics and to understand the operational envelope. In this endeavour, a digital engineering…

Advanced modeling and management strategies for nuclear and radiological incidents: from decision support to adaptive governance

Petre Cornel Min

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Nuclear and radiological emergency preparedness and response (EPR) including decision-support systems and emergency management frameworks operate at the intersection of advanced technical modelling, organizational processes, human decision-making, and societal dynamics. This review is based on a…

Evaluation of the Lawson criterion for aneutronic proton-boron-11 fusion: effects of ion temperature and bremsstrahlung losses

Irfan Maulana Ahmad; Abd. Djamil Husin; Duong Thanh Tai dkk.

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Nuclear fusion, the process of combining light nuclei to form heavier nuclei, offers a promising pathway to sustainable clean energy with minimal radioactive waste. The Lawson criterion, expressed as the product of plasma density, confinement time, and temperature, establishes the conditions…

Editorial: EURAD: state of the art in research and development on radioactive waste management and disposal

Tara Beattie; Bernd Grambow

Frontiers in Nuclear Engineering, Vol. 4 · 2026 · Inggris · DOAJ Scopus

Identification of safety-relevant radionuclides for performance assessment modeling

Stefan Finsterle; Michael J. Hannon; Jesse Sloane

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

We propose, apply, and verify a screening approach for the selection of safety-relevant radionuclides that should be tracked in models assessing the performance of geologic repositories for the disposal of spent nuclear fuel and high-level radioactive wastes. Starting with a comprehensive list of…

First evaluation of geopolymer encapsulation of simulated alkaline aluminum-rich liquid waste from Mo-99 production

Whitney Talavera Ramos; Adrián Tellería Narváez; Lucas Dos Santos dkk.

Frontiers in Nuclear Engineering, Vol. 4 · 2026 · Inggris · DOAJ Scopus

This study investigates the synthesis and characterization of metakaolin-based geopolymers for the immobilization of simulated aluminum-containing radioactive liquid waste. Two kaolin precursors with different Si/Al ratios and purities were calcined between 700 °C and 900 °C. Geopolymers were…

A future design approach to nuclear waste repository siting: activating futurability and cultivating pride

Tatsuyoshi Saijo

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Nuclear waste repository siting presents an unprecedented intergenerational challenge: decisions made today will affect approximately 5,000 future generations over 100,000 years. Contemporary approaches in Finland, Sweden, and France rely almost exclusively on present-generation perspectives in…

On the feasibility of fissile material production with inertial electrostatic confinement fusion devices

Alex Little; Yannick Verbelen; Mahmoud Bakr Arby dkk.

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Inertial electrostatic confinement fusion devices (fusors) are becoming increasingly attractive neutron sources, and are well suited for global distribution with great humanitarian benefits. However, such neutrons are agnostic to the user’s intent, so could in theory be used for malicious means…

The safety case for a deep geological repository in Switzerland: engineered barriers for low- and intermediate-level waste disposal

Lukas Martin; Georg Kosakowski; Typhaine Guillemot dkk.

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

The safe geological disposal of low- and intermediate-level radioactive waste relies on a passive multi-barrier system. This paper presents the provisional Swiss design for the low- and intermediate-level waste (L/ILW) emplacement caverns and their expected evolution. In the current design…

The safety case for a deep geological repository in Switzerland: site and geological barrier characteristics

Raphael A. J. Wüst; Michael Schnellmann; Angela Landgraf dkk.

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Deep geological repositories for radioactive waste rely on geological barriers to isolate waste and impede or limit radionuclide migration over long geological timescales or until radioactivity has decreased to natural radiation levels. This study summarises the main geological evidence and…

The safety case for a deep geological repository in Switzerland: assessment and modelling of the biosphere

Ashley Brown; Raphael A. J. Wüst; Russell Walke dkk.

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

The post-closure biosphere assessment and modelling in support of the general licence application for a deep geological repository for radioactive waste provides the basis for evaluating radiological consequences should radionuclides released from the geological repository reach the surface and…

Full-core high-burnup BWR LOCA fuel performance analysis and FFRD susceptibility

Ian Greenquist; Aaron Wysocki; Pierre-Clément A. Simon dkk.

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

The susceptibility of the boiling water reactor (BWR) Limerick Unit 1 to fuel fragmentation, relocation, and dispersal during a postulated large-break loss-of-coolant accident (LBLOCA) was calculated using a multiphysics framework. The simulations include full-core, rod-resolved neutronic, thermal…

Neutronic and safety evaluation of a hybrid UO2-U3Si2 accident tolerant fuel assembly for VVER-1000 reactors

S. M. Saidur Rahman Turjak

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

This paper evaluates the neutronic feasibility and multi-physics safety of a hybrid Accident Tolerant Fuel (ATF) assembly in a VVER-1000 reactor. The proposed design strategically employs standard UO2 within the inner core and a high-density U3Si2 matrix in the peripheral pins to take advantage of…

RADRISK Inspector: a mobile application for shielding design and safety distance calculation in industrial gamma radiography

M. Suffo; D. Brea-Piñero; J. F. Molina-Pérez dkk.

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Industrial gamma radiography is a widely used non-destructive testing (NDT) technique, but it involves significant radiological risks that require precise planning of shielding and safety distances. Current practices rely heavily on in-situ radiometric measurements, which are time-consuming and may…

The safety case for a deep geological repository in Switzerland: engineered barriers for high-level waste disposal

Nikitas Diomidis; Typhaine Guillemot; Lukas Martin dkk.

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

The safe geological disposal of high-level radioactive waste requires a passive multi-barrier system. This paper describes the engineered barriers foreseen in the provisional Swiss repository concept, covering both design aspects as well as evidence for their long-term performance. Disposal…

Editorial: Advanced modeling and management strategies for nuclear and radiological incidents

Nadja Zeleznik

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Citizen measurement of ambient dose rate: challenges and opportunities

Jean-Marc Bertho

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Radiation measurements by citizen appeared for the first time in the aftermath of the Chornobyl accident and received a renewed interest in the aftermath of the Fukushima accident. At that time, several networks of citizen measurement of radioactivity appeared in Europe, mainly acting for education…

Meaningful dose in geological disposal safety cases: human intrusion and normal evolution as competing exposure pathways

Claudio Pescatore

Frontiers in Nuclear Engineering, Vol. 5 · 2026 · Inggris · DOAJ Scopus

Geological disposal safety assessments distinguish normal evolution from inadvertent human intrusion. Normal evolution is treated as the expected long-term behaviour of the disposal system; human intrusion is treated as a stylised future human action whose probability cannot be forecast reliably…