Designs / dsn-allegro
ALLEGRO gas-cooled fast-reactor demonstrator
Dated 2025 demonstrator configuration: 75 MWth and 0 MWe in the developer’s technical table. VUJE explicitly described ALLEGRO as a small modular reactor in 2023. Development is by the V4G4 consortium, including HUN-REN EK, NCBJ, ÚJV Řež and VUJE; the linked ÚJV profile represents one member, not a sole vendor. This demonstrator is distinct from commercial HeFASTo. Later power-conversion and cogeneration work does not change this dated zero-electric configuration or prove a deployment.
Catalogue identity snapshot: 2025 (dated technical description; not confirmation of current development or availability). Later technical descriptions, where recorded, are dated separately below. Source review does not establish current availability or a deployment.
- Class
- SMR
- Technology
- Other
- Coolant
- helium
- Spectrum
- fast
- Developer / vendor(s) as of 2025
- ÚJV Řež
- Module electrical
- 0 MWe (thermal only)
- Module thermal
- 75 MWth (nameplate; basis unspecified)
- Inclusion basis
- smr_by_vendor_claim_with_capacity_check
- Confidence
- medium
- Last verified
- 2026-10-13
Tracked deployment projects
- No projects tracked here.
Design sources
- VUJE: ALLEGRO small modular reactor development (company_primary, published 8 Jan 2023, accessed 2026-10-13)
- ÚJV Řež: gas-cooled fast-reactor research programme (2025) (company_primary, dated 2025, accessed 2026-10-13)
- TREASURE: ALLEGRO demonstrator programme (2026) (company_primary, dated 2026, accessed 2026-10-13)