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Who We Are


Zachry Nuclear Engineering provides trusted, best-in-class software tools, analysis, engineering, design and project management services for design and safe operation of nuclear facilities worldwide, with a focus on innovative, effective solutions, customer relationships, and long-term value. We offer skilled mechanical, electrical, controls, civil and structural engineering professionals and designers who are knowledgeable and experienced in power plant systems, engineering analysis and modification package development. Our staff has performed all phases of power plant projects from conceptual and detailed design to construction and startup testing.

Distinctive Outcomes

ZNE works closely with the operating fleet to:

Certified Processes

ZNE is a qualified nuclear Quality Assurance (QA) supplier.
Software Development and Maintenance


PWR Fuel Bundle
Zachry Nuclear Engineering was founded in 1974 as Proto-Power Management Corporation by seven individuals from General Dynamics’ Electric Boat Division. The company’s initial focus was in providing project management, quality assurance, and third party consulting services to the commercial nuclear power industry.

In 1994, Proto-Power completed the development, testing, and release of its nuclear system analysis software, PROTO-FLO Since then, the Analysis group has continued to improve and add to the PROTO-Series of software tools for plant analysis with PROTO-HX for heat exchanger performance and PROTO-HVAC for heating, ventilating and air conditioning systems performance. By 1997, Proto-Power had outgrown its office facility and moved to its current office location.

In 2000, Proto-Power was acquired by Xcel Energy, a utility based in Minneapolis. By this time, the company had grown to about 125 employees and was focused on our current core business of providing engineering, design, and project management services to support the US nuclear power industry.

In 2005, Xcel Energy sold Proto-Power to Zachry Group, a privately held construction firm based in San Antonio, TX. The company was renamed Zachry Nuclear Engineering in 2009, following Zachry’s decision to establish a separate new business entity, Zachry Nuclear Inc., to provide services to the existing US fleet of nuclear units and to pursue new nuclear power plant construction projects.

In 2010, ZNE opened a new office in Charlotte, NC to better focus on nuclear utilities located on the southeastern region of the US. The office was co-located with a ZEC office.

The ZNE Analysis Division was formed in 2011 with the acquisition of Numerical Applications, Inc. (NAI). Established in 1984, NAI was an industry leader in the development, support and application of software for multiphase flow and heat transfer. NAI’s GOTHIC™ code is used for containment and primary system analysis, building performance (e.g., room heat up, hazardous gas distribution, and fission product release) and to model component systems to address specific operating and safety concerns. The software is used in the US and internationally for safety and licensing analysis for Generation 2, 3 and 4 reactor designs, including liquid sodium and molten salt systems.

In 2015, the ZNE Analysis Division range of capabilities and expertise was further advanced by the acquisition of Computer Simulation and Analysis, CSA. Founded in 1988, CSA brought a team of nuclear engineers and computer scientists with extensive expertise in the simulation of reactor core and system thermal hydraulics. Their VIPRE and RETRAN codes are widely used to support existing plants and new system designs for operating and safety analysis. The company was recognized by the US Small Business Administration with a Tibbetts award for innovative and technical accomplishments in the Small Business Innovation Research Program.

The combined expertise of the staff, together with the software tools they have developed for modeling thermal hydraulics and multiphase flow and heat transfer, put the ZNE Analysis Division in a strong position to provided engineering analysis, and software development and support to address the thermal hydraulic issues in nuclear plant design and operation.



Office Locations

Cary, NC

200 Regency Forest Drive
Suite 330
Cary, NC 27518
(919) 465-7230

Stonington, CT

14 Lords Hill Road
Stonington, CT 06378
(860) 446-9725

Richland, WA

1955 Jadwin Avenue
Richland, WA 99354
(509) 943-0861

Idaho Falls, ID

410 Memorial Drive
Suite 205
Idaho Falls, ID 83402
(208) 529-1700

Charlotte, NC

2810 Coliseum Centre Drive
Suite 200
Charlotte, NC 28217
(704) 969-3150

Cary 200 Regency Forest Drive, Suite 330, Cary, NC 27518 (919) 465-7230
Stonington 14 Lords Hill Road, Stonington, CT 06378 (860) 446-9725
Richland 1955 Jadwin Avenue, Richland, WA 99354 (509) 943-0861
Idaho Falls 410 Memorial Drive, Suite 205, Idaho Falls, ID 83402 (208) 529-1700
Charlotte 2810 Coliseum Centre Drive, Suite 200, Charlotte, NC 28217 (704) 969-3150
200 Regency Forest Drive
Suite 330
Cary, NC 27518
(919) 465-7230
14 Lords Hill Road
Stonington, CT 06378
(860) 446-9725
1955 Jadwin Avenue
Richland, WA 99354
(509) 943-0861
410 Memorial Drive
Suite 205
Idaho Falls, ID 83402
(208) 529-1700
2810 Coliseum Centre Drive
Suite 200
Charlotte, NC 28217
(704) 969-3150





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