Projects / prj-httr-oarai
HTTR test reactor with planned hydrogen coupling, Oarai
Test reactor (30 MWt), no electricity. JAEA's HTTR first reached criticality in 1998; in 2025 JAEA applied to the regulator to connect a hydrogen production plant, targeting hydrogen by 2030.
- Stage
- Operating
- Design
- HTTR (SMR)
- Technology
- Other · unknown
- Operator(s)
- Japan Atomic Energy Agency
- Vendor(s)
- Japan Atomic Energy Agency
- Location
- JAEA Oarai Nuclear Engineering Institute · Japan · precision: undisclosed
Searchable without an invented map pin. - Coordinates
- undisclosed / not plotted
- Electrical capacity
- thermal only (no MWe) · scope: plant
- Thermal capacity
- 30 MWth (nameplate_unspecified)
- Modules planned
- 1
- Inclusion basis
- smr_by_vendor_claim_with_capacity_check
- Confidence
- medium
- Last verified
- 2026-10-02 (publication/verification date)
Milestones & dated events
- No dated milestones recorded yet.
Regulatory actions
- None recorded in this release.
Sources
- JAEA: amendment to HTTR licence application for hydrogen plant connection (company_primary, accessed 2026-10-02)
- WNN: MHI to lead development of Japanese HTGR (reputable_press, accessed 2026-10-02)