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.
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-19.
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.
$220
Lodging/Night
$132
M&IE/Day
$352
Total/Day
France: 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.
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.
48.3514, -3.86703
Location & Contact
?
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
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: Brennilis Nuclear Power Plant.
Monts d'Arrée is the site of the EL-4 reactor, an experimental unit in the Monts d'Arrée hills of Finistère, Brittany, near the village of Brennilis. It was a heavy-water-moderated, carbon-dioxide-cooled reactor with a planned output of 70 MW electric.
Read more
Construction began in 1962 under the French atomic energy commission, and the reactor first reached criticality in December 1966. It was connected to the grid on 9 July 1967. In 1975, explosions damaged a turbine, and in 1979 an attack by the Breton Liberation Front destroyed the power lines linking the plant to the grid. EL-4 was permanently shut down on 31 July 1985. Decommissioning work followed, with a flood in December 2000 and a fire in January 2001 during one phase.
