Research and test reactors, critical assemblies and prototypes at this site, as listed in the IAEA Research Reactor Database: type, thermal power, first criticality, shutdown date, current status and what each is used for.
3 reactors: 1 operational, 1 decommissioned, 1 under construction.
Reactor
Type
Thermal Power
First Criticality
Shutdown
Status
Used For
HFR
Tank In Pool
45 MWt
1961-11-09
Operational
isotope production, materials testing, training
KRITO
Crit Assembly
100 Wt
1963-03-29
Decommissioned
nuclear data
PALLAS
Pool
25 MWt
2031-04-01
Under construction
Source: IAEA Research Reactor Database (RRDB), as of 2026-10-13.
Fuel Cycle Facilities
?
Fuel cycle plants at this site, as listed in the IAEA Nuclear Fuel Cycle Facilities Database: what each plant does, its scale and design capacity, the years it operated, its current status and who operates it.
1 facility: 1 in operation.
Facility
Type
Scale
Design Capacity
Operated
Status
Operator
Waste Storage Facility
AFR Dry Spent Fuel Storage
1961–
In Operation
NRG
Source: IAEA Nuclear Fuel Cycle Facilities Database (NFCFDB), as of 2026-10-13.
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.
$192
Lodging/Night
$120
M&IE/Day
$312
Total/Day
Netherlands: 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.
52.7881, 4.67748
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: Petten nuclear reactor; IAEA: Wijtsma, NRG Petten presentation; IGORR 2009: Versteegh, HFR Petten.
Petten is a village in the province of North Holland, in the Netherlands, and the site of a nuclear research establishment built around the High Flux Reactor (HFR). The HFR was built to give the Dutch nuclear program irradiation capacity and experience.
Read more
A contract for the reactor was signed in May 1956 with the nuclear division of American Car & Foundry, and construction began in 1958. Allis-Chalmers took over the project in 1959. The HFR reached criticality on November 9, 1961, and its power was raised in steps to 45 megawatts thermal by 1970. A reactor vessel replacement kept it shut down from November 1983 to January 1985. Conversion to low enriched uranium fuel was completed in 2006. A low-flux reactor there, first used in 1960, shut down in 2010.
