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.
4 reactors: 4 decommissioned.
Reactor
Type
Thermal Power
First Criticality
Shutdown
Status
Used For
HST Horizontal Split Table
Crit Assembly
1 Wt
1965-01-01
Decommissioned
nuclear data
SS, Solution System
Crit Assembly
1 Wt
1965-01-01
Decommissioned
nuclear data
TR, Tank Reservoir
Crit Assembly
1 Wt
1965-01-01
Decommissioned
nuclear data
VST Vertical Split Table
Crit Assembly
1 Wt
1965-01-01
Decommissioned
nuclear data
Source: IAEA Research Reactor Database (RRDB), as of 2026-10-13.
Working Here
Per Diem Rates
FY 2027
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Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from GSA for FY 2027. Lodging rates vary by month — click "Show Monthly" to see the breakdown.
$173
Lodging/Night
$125–$173 range
$80
M&IE/Day
$253
Total/Day
Boulder / Broomfield, Boulder / Broomfield County, CO
Maximum state unemployment insurance benefits for CO. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
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.
39.891, -105.203
Location & Contact
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Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Community ratings from NukeWorker members. Vote to share your experience working at this facility. Score uses a Bayesian average that accounts for vote count — facilities with few votes are pulled toward the fleet average, so rankings reflect confidence, not just raw percentages.
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: Rocky Flats Plant.
Rocky Flats was a U.S. nuclear weapons component plant in Jefferson County, Colorado, near Arvada and about 15 miles northwest of Denver. It was run for the Atomic Energy Commission and later the Department of Energy by contractors that included Dow Chemical and Rockwell International.
Read more
The plant operated from 1952 to 1992 and made plutonium pits, the fissile cores of nuclear weapons. A plutonium fire occurred on September 11, 1957, and a larger glovebox fire burned for about six hours on May 11, 1969. On June 6, 1989, an FBI and EPA raid led to the suspension of plutonium production. The plant was formally shut down in 1992, and cleanup was declared complete on October 13, 2005. Congress authorized a national wildlife refuge on part of the site in 2001.
