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
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- NAICS codes registered in SAM.gov
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- 541330 Engineering Services Primary
- 334111 Electronic Computer Manufacturing
- 334112 Computer Storage Device Manufacturing
- 334210 Telephone Apparatus Manufacturing
- 513210 Software Publishers
- 517810 All Other Telecommunications
- 541511 Custom Computer Programming Services
- 541512 Computer Systems Design Services
Show all
- 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
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RSI Entech, LLC
Parent
G4QHA4XRAA86
- RSI Nuclear, LLC NB31NPVJHRZ5
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RSI Entech, LLC
Parent
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
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- 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 .
Recent federal awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| Savannah river site technical support services | National Nuclear Security Administration | $10,411,386 | |
| New award of task order 26: spent nuclear fuel (SNF) shipping rate feasibility study | National Nuclear Security Administration | $224,610 | |
| Task order 27 - industry advisory panel peer reviews | National Nuclear Security Administration | $599,937 | |
| Task order 31: reuse/purchase of casks and support for the consolidated storage facility (CSF) integrated project team… | National Nuclear Security Administration | $136,000 | |
| Task order 32: NRC licensing and support for the consolidated storage facility (CSF) integrated project team (IPT) | National Nuclear Security Administration | $136,000 |
About RSI Nuclear, LLC
Sigma Science Inc., a division of RSI Entech LLC, is an Alaskan Native Corporation-owned, minority-owned, and self-certified small disadvantaged business headquartered in Albuquerque, New Mexico, that delivers nuclear safety advisory, environmental compliance consulting, and technical engineering services to the Department of Energy and related federal agencies as a prime contractor (82% of recent awards) under total small business set-aside designation. The company holds SBA 8(a) certification and competes predominantly in the 8(a) and total small business set-aside categories across its prime footprint.
Sigma Science's customer concentration is acute and DOE-centric. The top five customer agencies account for 96% of recent awards, led by the Department of Energy National Nuclear Security Administration (36 awards, $201.9 million combined potential value) and the Department of Energy Office of Nuclear Energy (26 awards, $70.7 million), with the Department of Energy Office of Environmental Management, GSA Federal Acquisition Service, and the Defense Threat Reduction Agency rounding out the active set. The two rankings align closely by dollar magnitude — NNSA dominates both volume and dollars. Sigma Science holds a seat on two major governmentwide vehicles: the OASIS+ Small Business Multiple Award Contract (awarded December 19, 2024, with a $999,999,999,999 ceiling through December 18, 2029) and the Nuclear Industry Advisory and Assistance Services Government-Wide Acquisition Contract (a $49 million total small business set-aside GWAC awarded to Sigma Science on May 1, 2022, through April 30, 2027). Under NIASS, Sigma Science has executed 27 task orders ranging from approximately $22,000 to $3.2 million in ceiling value, spanning multiple task orders through 2031.
Capability work centers on nuclear safety specialist support, spent nuclear fuel and high-level waste repository licensing analysis, environmental compliance and air quality subject matter expertise, interim storage advisory services, quality assurance program support, and industry advisory panel peer reviews. Recent representative awards include a $3.2 million task order under NIASS for industry advisory panel peer reviews to DOE's Office of Nuclear Energy (March 4, 2026), multiple consolidated storage facility integrated project team delivery orders ($338,673 each for NRC licensing, cask reuse, and quality assurance support, issued February 18, 2026), a $1.742 million task order for nuclear safety specialist support to the Office of Nuclear Energy's NE-5 division (September 26, 2024), a $4.01 million delivery order under the DOE/NNSA Technical and Engineering Professional Services (TEPS) III BPA for nuclear stockpile sustainment management and support systems (June 11, 2024), and a $1.862 million delivery order for tribal collaboration initiative development (June 21, 2024, closed out).
The vendor's top parent vehicles carry diverse work types. The Government Wide Acquisition Contract (GWAC) 89243222DNE000002 carries 24 task orders valued at $20.6 million in combined potential value; the Multiple Award Schedule hosts 10 task orders valued at $160.7 million combined; and three indefinite delivery contracts (89233118DNA000008, 89233118DNA000009, and DENA0002862) combined anchor $12.5 million across 22 task orders. Work is predominantly performed in Albuquerque, New Mexico, with secondary performance in Oak Ridge, Tennessee (under parent company operations) and Washington, DC (NNSA-funded activities).
Activity has grown sharply — from six awards in 2022 to twenty-four in 2024 — though 2025 to date shows four awards. Eight awards carrying combined potential value of $145.8 million face ultimate completion inside the next twenty-four months and present recompete exposure. Across SCI-reportable service contracts (covering federal contracts above the $150,000 threshold), Sigma Science invoiced $12.6 million in FY2022, $19.3 million in FY2023, and $13.3 million in FY2024, scaling the federal workforce from 39.9 FTEs to 73.1 FTEs over that period. On federal services contracts captured in SCI, government-paid rates ran a median of $151.86 per hour, with the 10th percentile at $76.01 per hour and the 90th percentile at $281.66 per hour. Sigma Science self-performed the vast majority of work; across SCI-reportable prime contracts, subcontractors accounted for roughly 6% of contractor hours, with six named subcontractors engaged primarily to Waste Isolation Pilot Plant operations (under sub-relationships with prime contractors including Mission Support & Test Services LLC) and Idaho Cleanup Project end-state work.
The GSA Schedule labor portfolio spans 40 categories, from Administrative Support at $69.27 per hour through Subject Matter Expert V positions at $326.84 per hour, with education requirements ranging from high school to bachelor's degree and no security-clearance roles offered. This labor breadth supports the company's positioning across multiple federal domains under both small business set-asides and open competition. Sigma Science is a subsidiary of RSI Entech LLC, also Alaskan Native Corporation-owned and minority-owned, which operates as the parent company and itself holds federal prime contract awards.
Contract vehicles
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
What is RSI Nuclear, LLC's UEI?
RSI Nuclear, LLC's Unique Entity ID (UEI) in SAM.gov is NB31NPVJHRZ5.
What is RSI Nuclear, LLC's CAGE code?
RSI Nuclear, LLC's CAGE code is 4F4W2.
What is RSI Nuclear, LLC's primary NAICS code?
RSI Nuclear, LLC's primary NAICS code is 541330 (Engineering Services).
Where is RSI Nuclear, LLC located?
RSI Nuclear, LLC's physical address in SAM.gov is 6565 Americas Pkwy #910, Albuquerque, NM 87110, USA.
Is RSI Nuclear, LLC registered in SAM.gov?
Yes. RSI Nuclear, LLC's SAM.gov registration is active through September 15, 2027.
Who is RSI Nuclear, LLC's parent company?
RSI Nuclear, LLC is part of RSI Entech, LLC.
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.
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
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