Toshiba 4S Sodium-Cooled Reactor Revival by Zap Energy
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Source: American Nuclear Society (ANS)
The project involves the revival and modernization of Toshiba's 4S (Super-Safe, Small, and Simple) sodium-cooled microreactor design by Zap Energy. Originally developed by Toshiba for remote locations with small grids, the 4S is a 30-MWt pool-type reactor designed to run for 30 years without refueling. Zap Energy plans to use modern design tools to enhance the 4S concept as a base for their first
- Status
- Prospective
- Sector
- Power Generation (CCGT), Education, Nuclear
- Location
- Galena, Alaska, United States of America
- Updated
- 22 Jul 2026
- Source
- American Nuclear Society (ANS)
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Project Information
Participants
| Not available for this record. |
Status
Original status | planned |
Taiyo status | Prospective |
Taiyo last update | 2026-07-22 |
Contact
| Not available for this record. |
Description
Description | The project involves the revival and modernization of Toshiba's 4S (Super-Safe, Small, and Simple) sodium-cooled microreactor design by Zap Energy. Originally developed by Toshiba for remote locations with small grids, the 4S is a 30-MWt pool-type reactor designed to run for 30 years without refueling. Zap Energy plans to use modern design tools to enhance the 4S concept as a base for their first fission product design, combining near-term fission deployment with long-term fusion development. |
Original sector | Energy |
Location
Country | United States of America (USA) |
State | Alaska |
City | Galena |
Source
Source | American Nuclear Society (ANS) |
URL |
More Details
Record type | Project |
Sector | Power Generation (CCGT), Education, Nuclear |
Article published date | 2026-05-09 |
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