Monju
Reactor Data
Reactor Units
Every power reactor at this site as listed in the IAEA Power Reactor Information System (PRIS): reactor type and model, net electrical capacity, grid connection and commercial operation dates, and current status.
1 unit: 1 permanent shutdown.
| Unit | Type | Model | Net MWe | Construction | Grid | Commercial Op | Shutdown | Status |
|---|---|---|---|---|---|---|---|---|
| Monju | FBR | - | 246 | 1986-05-10 | 1995-08-29 | 2017-12-05 | Permanent Shutdown |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Monju | 246 | 280 | 714 | 1994-04-05 | TOSHIBA / HITACHI / FUJI ELECTRIC HOLDINGS / MITSUBISHI HEAVY INDUSTRIES | TOSHIBA CORPORATION | Suspended 1995-12-08; Restarted 2017-12-05 |
Operator: JAPAN ATOMIC ENERGY AGENCY
Owner: JAPAN ATOMIC ENERGY AGENCY
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-14.
Working Here
Per Diem Rates FY 2026
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from the U.S. State Department foreign per diem tables for FY 2026.
$208
Lodging/Night
$107
M&IE/Day
$315
Total/Day
Japan: rate for locations the State Department does not list separately
U.S. Department of State foreign per diem, for U.S. government and contractor travel.
Photos
Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.
Facility Map
Interactive satellite map showing the facility's geographic location. Marker color indicates current status: green for online, red for offline, orange for reduced power. Click the header to open in Google Maps satellite view.
35.7391, 135.987
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Plant Facts
About This Site
Written by NukeWorker from public records: facts that do not change. Operator, status and capacity come from the live data elsewhere on this page. Sources: Wikipedia: Monju Nuclear Power Plant.
Monju was a prototype sodium-cooled fast breeder reactor at Tsuruga, Fukui Prefecture, Japan.
Read more
The reactor first reached criticality in April 1994 and was connected to the grid on 29 August 1995. On 8 December 1995 a sodium leak and fire (INES level 1) forced it to shut down. It restarted in May 2010, but on 26 August 2010 a 3.3-tonne in-vessel transfer machine fell into the reactor vessel during fuel handling. The government decided to close the reactor in December 2016, and it was permanently shut down on 5 December 2017.