RSI Nuclear, LLC
Albuquerque, NM Sigma Science, Inc. Part of RSI Entech, LLC
- UEI
- NB31NPVJHRZ5
- CAGE
- 4F4W2
- Primary NAICS
- 541330 Engineering Services
- SAM.gov registration
- Active through
Company facts
- FY2025 rankings
-
Its parent company, Sigma Science Inc, ranks #76 at the Department of Energy
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- Other NAICS codes in SAM.gov
-
- 334111 Electronic Computer Manufacturing
- 334112 Computer Storage Device Manufacturing
- 334210 Telephone Apparatus Manufacturing
- 513210 Software Publishers
- 517810 All Other Telecommunications
- 541380 Testing Laboratories and Services
- 541420 Industrial Design Services
- 541511 Custom Computer Programming Services
Show all 22
- 541512 Computer Systems Design Services
- 541513 Computer Facilities Management Services
- 541519 Other Computer Related Services
- 541611 Administrative Management and General Management Consulting Services
- 541614 Process, Physical Distribution, and Logistics Consulting Services
- 541618 Other Management Consulting Services
- 541620 Environmental Consulting Services
- 541690 Other Scientific and Technical Consulting Services
- 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)
- 541990 All Other Professional, Scientific, and Technical Services
- 561210 Facilities Support Services
- 561320 Temporary Help Services
- 562910 Remediation Services
- 611430 Professional and Management Development Training
- Corporate family
-
-
Parent
Oak Ridge, TN
G4QHA4XRAA86
-
Parent
Oak Ridge, TN
G4QHA4XRAA86
- SAM.gov registration date
- Physical address
- 6565 Americas Pkwy #910, Albuquerque, NM 87110, USA
- Website
- rsienv.com
- Founded
- 1996
- Employees
- 251-1K
- Estimated annual revenue
- $50M-$100M
- Industry
-
- Industrials
- Commercial & Professional Services
- Professional Services
- Consulting
- SIC code
- 89 Services, Not Elsewhere Classified
- Profiles
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $0 |
| FY2026 | $32,525,200 |
| FY2025 | $18,039,060 |
| FY2024 | $22,214,678 |
| FY2023 | $20,204,621 |
Top agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of Energy | $32,525,200 |
Contract vehicles
- Multiple Award Schedule
- One Acquisition Solution for Integrated Services Plus - Total Small Business
- The Professional Services Schedule
Expired vehicles (1)
Contract awards
Latest 5 listed here. See the rest on GovTribe.
Contract subawards
| Prime contractor | Prime award | Amount | Awarded |
|---|---|---|---|
| Mission Support & Test Services LLC | DENA0003624 | $950,000 | |
| Idaho Environmental Coalition LLC | 89303321DEM000061 | $245,000 | |
| Idaho Environmental Coalition LLC | 89303321DEM000061 | $245,000 | |
| Salado Isolation Mining Contractors, LLC | 89303322DEM000077 | -$73,038 | |
| Idaho Environmental Coalition LLC | 89303321DEM000061 | $140,000 |
Latest 5 listed here. See the rest on GovTribe.
Similar vendors
| Vendor | Location | Primary NAICS |
|---|---|---|
| RSI Entech, LLC | Oak Ridge, TN | 562910 Remediation Services |
| Link Technologies Inc. | Germantown, MD | 541611 Administrative Management and General Management Consulting Services |
| SRS | Seattle, WA | 541990 All Other Professional, Scientific, and Technical Services |
| RSI Services LLC | Oak Ridge, TN | 541620 Environmental Consulting Services |
| Ismsolutions | Richland, WA | 541620 Environmental Consulting Services |
About the company
RSI Nuclear, LLC Sigma Science, Inc. Division, an Alaskan Native Corporation-owned 8(a) small disadvantaged business headquartered in Albuquerque, New Mexico, provides nuclear safety advisory, environmental compliance consulting, and technical engineering services to the Department of Energy and the National Nuclear Security Administration as a prime contractor (82% of recent awards) across delivery orders under government-wide acquisition contracts and multiple award schedules. The company operates as a wholly owned division of RSI Entech, LLC, a minority-owned Alaskan Native-controlled parent firm, and competes predominantly under total small business set-asides — nearly all prime awards carry set-aside designations.
Customer concentration is heavily skewed toward the nuclear security complex. The Department of Energy's National Nuclear Security Administration accounts for 37 awards and $276.3 million of the combined potential value (66% of the total portfolio), while the DOE's Office of Nuclear Energy represents 26 awards and $70.1 million (17%), and the GSA Federal Acquisition Service anchors 2 awards carrying $54.2 million. Together these three account for 98% of combined potential value across 65 awards. The portfolio spans 90 total awards since 2015 with $420.5 million in combined potential value and $142.9 million obligated (34% realization rate). Capability concentration runs tight: the vendor holds 24 task orders under the DOE/NNSA Technical and Engineering Professional Services (TEPS) III Blanket Purchase Agreement for Y-12 Project Management Office support, and 11 task orders under the GSA Multiple Award Schedule for nuclear nonproliferation and Savannah River Site technical support, with recent examples including a $78.4 million delivery order for Savannah River Site technical support services through July 2031 under the GSA MAS (awarded August 2026), a $4.01 million NNSA order for nuclear stockpile sustainment management support through April 2026, and multiple task orders under the DOE Office of Nuclear Energy's $49 million Nuclear Industry Advisory and Assistance Services GWAC (awarded May 2022 through April 2027) ranging from $22,000 to $3.2 million for spent nuclear fuel shipping studies, consolidated storage facility support, NRC licensing assistance, and quality assurance program support.
Sigma Science also qualifies under the OASIS+ Small Business multiple-award indefinite-delivery contract (a multi-billion-dollar government-wide vehicle awarded December 2024 through December 2029 with total small business set-aside status), positioning the vendor to compete for task orders across seven functional domains: Management and Advisory, Technical and Engineering, Research and Development, Intelligence Services, Environmental Services, Facilities, and Logistics. On the GSA Schedule, the vendor offers 40 labor categories spanning administrative support through senior subject matter expertise at hourly rates from $69.27 to $326.84, with no security clearance requirements listed. The portfolio's primary service code classification is 58 awards under "Support — Professional: Engineering/Technical," with secondary concentration in 7 awards for "Support — Administrative: Other" and remediation services.
Activity has scaled unevenly. Award volume peaked at 24 orders in 2024 before dropping to 4 in 2025 and 7 in 2026 year-to-date, reflecting lumpy procurement cycles tied to NNSA Y-12 support and TEPS BPA task ordering. SCI-reportable invoiced revenue (federal service contracts above the $150,000 threshold) reached $21.6 million in FY2025 across 94.0 contract-level FTEs, up from $13.3 million in FY2024 at 67.3 FTEs, representing growth in government-paid labor scale. Government-paid hourly rates on federal service contracts derived from SCI invoicing ran a median of $129.40/hr (10th percentile $81.70/hr, 90th percentile $282.74/hr) across the prime portfolio. Across SCI-reportable prime contracts, Sigma Science self-performed roughly 93% of contractor hours, with subcontractors accounting for 7% of total hours spread across 16 named subcontractors — a predominantly self-delivery model typical of nuclear technical advisory work. Subcontract engagement includes work under Mission Support & Test Services LLC for Nevada National Security Site nuclear safety basis support, and staffing augmentation on the Idaho Cleanup Project End State contract for mechanical engineers and civil/structural engineers, and Waste Isolation Pilot Plant operations support.
Seven awards totaling $85.7 million in combined potential value reach ultimate completion within the next twenty-four months, exposing the vendor to significant recompete activity in FY2027–2028, particularly on NNSA-funded contracts where renewal of task orders and parent vehicles will drive pursuit intensity.
SBA capabilities narrative
SSI provides Project/Program Management, Maintenance, Operations, System Engineering, Safety Analysis, Radiological Engineering, Environmental Management, Nuclear Materials Management, Hazardous Materials Management, Risk Management.
Quick answers
Is RSI Nuclear, LLC registered in SAM.gov?
Yes. RSI Nuclear, LLC's SAM.gov registration is active through October 5, 2027.
Which contract vehicles does RSI Nuclear, LLC hold?
RSI Nuclear, LLC holds a place on 4 federal contract vehicles, including MAS, OASIS+SB and PSS.
How much has RSI Nuclear, LLC received in federal contracts?
Federal contracts obligated $18,039,060 to RSI Nuclear, LLC in fiscal year 2025 and $92,983,560 in fiscal years 2023 through 2027.
How does RSI Nuclear, LLC rank among federal contractors?
RSI Nuclear, LLC's parent company, Sigma Science Inc, ranked #76 at the Department of Energy in FY2025.
What is RSI Nuclear, LLC's most recent federal award?
RSI Nuclear, LLC's most recent federal contract award is Savannah river site technical support services (89233126FNA400770), from National Nuclear Security Administration, on August 1, 2026.
On GovTribe
See RSI Nuclear, LLC's full federal record
- Federal contract awards
- IDV awards
- Contract vehicles
- Subcontracting relationships
- Funding analysis by agency, NAICS and set-aside
- Similar vendors