SMRMap SMR companies, designs, and deployment projects — sourced, limited coverage

Programmes and agreements / prg-br-mnb-technology-development

Brazilian Microreactor (MNB) technology-development programme

Diamante, Terminus and INB describe a Brazilian microreactor technology-development programme involving IEN, IPEN and other research partners. Diamante's project page describes 5 MWe in a 40-foot container. IEN's November 2025 account describes about 5 MWth. These specifications remain unreconciled, and the programme's relationship to the HARPIA design is unresolved. This programme record does not establish an operating commercial reactor or an authorized deployment.

Type
Research programme
Countries concerned
Brazil
Participants and roles
  • Developer or vendor: Terminus R&D in Energy S.A.
  • Developer or vendor: Diamante Energia
  • Developer or vendor: Indústrias Nucleares do Brasil (INB)
  • Research: Instituto de Engenharia Nuclear (IEN/CNEN)
  • Research: Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN)
Designs named
—
Scale as stated
Not stated by the sources
Announced or first reported
18 Mar 2025
Recorded status
Status not established
Documented by CNEN on 18 March 2025. No programme start day or present implementation status is established. Read the source dates: this does not confirm continuing activity today.
Confidence
medium
Not yet recorded
Expected but not recorded as a structured fact: Status. A missing structured fact does not mean zero or that it does not exist; a documented review limit is named beside the fact, and the description and sources may say more.
Record reviewed
2026-10-19 (record review date, not proof of current activity)

Sources