Advancing Gas-cooled Fast Reactor Technology: Outcomes of the Euratom SafeG Project on ALLEGRO Research and Development

Boris Kvizda; Slavomír Bebjak; Gusztáv Mayer; Petr Vácha; Tomáš Melichar; Congjin Ding

doi:10.1051/epjn/2025021

2024 Impact factor 1.7

Nuclear Sciences & Technologies

Euratom Research and Training in 2025: ‘Challenges, achievements and future perspectives’, edited by Roger Garbil, Seif Ben Hadj Hassine, Patrick Blaise, and Christophe Girold

Open Access

EPJ Nuclear Sci. Technol. 11, 25 (2025)
https://doi.org/10.1051/epjn/2025021

Regular Article

Advancing Gas-cooled Fast Reactor Technology: Outcomes of the Euratom SafeG Project on ALLEGRO Research and Development

Boris Kvizda¹^*^,**, Slavomír Bebjak¹^,**, Gusztáv Mayer²^,**, Petr Vácha³^,**, Tomáš Melichar⁴^,** and Congjin Ding⁵^,**

¹ VUJE, a. s., Okružná 5, Trnava 918 64, Slovak Republic
² HUN-REN Centre for Energy Research, 1525 Budapest 114, P.O. Box 49, Budapest, Hungary
³ ÚJV Řež, a. s., Hlavní 130, Řež, 250 68 Husinec, Czech Republic
⁴ Centrum Výzkumu Řež s.r.o., Hlavní 130, 250 68 Husinec- Řež, Czech Republic
⁵ Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, United Kingdom

^* e-mail: boris.kvizda@vuje.sk

Received: 15 November 2024
Received in final form: 29 January 2025
Accepted: 23 April 2025
Published online: 9 June 2025

Abstract

The paper describes R&D activities suported by Euratom funded projects (SafeG, TREASURE) focused on advancing the development of the Gas-cooled Fast Reactor (GFR) demonstrator ALLEGRO, a key technology in the Generation IV nuclear reactor systems. With the backing of the Generation IV International Forum (GIF) and European Sustainable Nuclear Industrial Initiative (ESNII) of the Sustainable Nuclear Energy Technology Platform (SNETP), GFR technology promises high efficiency in both electricity and industrial heat production, owing to its ability to achieve high core outlet temperatures and close the fuel cycle. The presented activities revolve around addressing crucial technical challenges linked to the ALLEGRO demonstrator. The described projects have brought together leading European and international experts in GFR and High-Temperature Reactor (HTR) technologies. The key outcomes of the SafeG Project include advancements in core safety (WP1), innovative materials (WP2), passive safety systems (WP3), standardization and codes (WP4), and education and training activities (WP5). The future activities are outlined for the follow-up Project TREASURE.

^**

These authors contributed equally to this work.

© B. Kvizda et al., Published by EDP Sciences, 2025

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.