Nuclear Operations

SN3’s nuclear operations at DOE sites are bolstered by the engineering and nuclear operations expertise and resources of Huntington Ingalls Industries (HII). SN3 also provides reach back capability to HII’s nuclear technical and operations expertise where environmental management and remediation are part of the work scope.

New Nuclear Facility Construction

Nuclear Construction SiteOur parent company HII employs over 4,800 engineers and technical specialists in a wide range of engineering fields for Nuclear Facilities Construction. They are involved in:

  • Planning
  • Design
  • Research & Development
  • Procurement
  • Construction & Overhaul
  • Refueling
  • Repair
  • Verification & Validation
  • Logistics

This expertise in structural, mechanical, electrical, nuclear, materials, and environmental engineering provides an unsurpassed background from which to offer professional engineering, design, planning and logistics services for commercial industries and partners through SN3.

Systems Integration

Our systems engineers integrate the efforts of each engineering discipline to effectively meet our customer’s needs. At the product level, HII produces optimized systems of systems with proper interfaces. At the system level, engineers bring together component subsystems and ensure that the subsystems function jointly as a system. SN3 employs the entire range of INCOSE systems engineering standards and disciplines, maintaining particular expertise in Requirements Management and Risk and Opportunity Management.


HII planners develop and maintain engineering and design products schedules to support the construction plan. Integrated planning schedules and network planning models identify critical paths, ensure that each discipline is kept in sync with each other, and facilitate the tracking and reporting of cost and schedule performance.


As a leader in the design of highly complex systems, HII personnel utilize state-of-the-art tools and design methods. We have applied 3D product modeling for design and manufacturing for over 25 years.

  • Computer-aided design
  • Modeling & simulation
  • integrated product & process development


For over 50 years, HII and SN3 have performed comprehensive design and lifecycle engineering services for DOE and DOD-centric facilities, sensitive assets, and infrastructure systems. Bolstered by an NQA-1 design quality assurance program, SN3 is skilled in providing lifecycle engineering services in and near nuclear facilities on a graded approach. SN3 offers design services in all engineering disciplines and has established working relationships with sub-consultants in specialty areas. A representative list of our services includes:

  • Lifting, handling & shipping
  • Shock, vibration & noise analysis
  • Multi-physics analysis
  • Power Generation & Distribution
  • Electromagnetic interference control
  • Data Networks
  • Voice & Video Distribution Systems
  • Component Engineering
  • Hydraulic Power Systems
  • Fluid Systems Analysis
  • Heating, Ventilation & Air Conditioning
  • Testing, Grooming, Start-Up and Commissioning
  • Quality Assurance & Control
  • Materials Coatings/Protection
  • Instrumentation & Control System Design

Specialty Areas

HII provides specialized engineering and technical experts provide additional services such as:

  • Human Systems Integration
  • Environmental, Safety & Health
  • Naval Architecture and Mass Properties
  • Signature Analysis
  • Materials & Welding Engineering
  • Non-destructive Test
  • Facilities & Crane Engineering
  • Laboratory Services

Logistics and Life Cycle Management

HII produces a complete and affordable range of innovative logistics products and services to keep systems performing to design standards throughout their entire life cycle. Our professionals combine expertise with productivity improvement in a challenging resource environment to ensure customers the highest level of satisfaction in meeting life cycle cost requirements.

  • Technical documentation
  • Maintenance Planning & Analysis
  • Configuration & Life Extension Program Management
  • Supply/Material Support
  • Training/Information Technology

Conduct of Operations (CONOPS)

CP_Nuclear-Operations_175wSN3’s CONOPS Program consists of formal documentation, practices, and actions implementing disciplined and structured operations that support mission success and promote worker, public, and environmental protection. Disciplined CONOPS minimizes the likelihood and consequences of human fallibility or technical and organizational system failures. SN3’s CONOPS Program supports an Integrated Safety Management (ISM) System by providing real techniques and practices to implement the ISM Core Functions of Develop and Implement Hazard Controls and Perform Work Within Controls, and provide feedback for improvements thorough lessons learned.

Our parent HII has been at the forefront of the Navy nuclear program for 60+ years, providing state-of-the-art services while operating aging facilities that are in some cases more than a century old. Our owner/operator approach to conducting complex operations within a heavily populated urban area, along with the high expectations of our customer, drives HII to develop maintenance and construction programs that ensure safe and compliant operations in a schedule- and profit-driven environment. SN3 has more than 55 years of experience providing technical solutions and expertise to address complex environmental response actions and CONOPS for federal and commercial facilities nationwide, including site remediation, facility decommissioning, environmental restoration; landfills; groundwater treatment; Hazardous, Toxic, and Radioactive Waste (HTRW) management; and regulatory compliance.

Lifting & Handling Programs & Crane Maintenance & Certification

SN3 has established procedures and programs for operation and safety requirements for lifting/rigging, use of mobile cranes, overhead cranes, and hoists. In fact, HII’s Newport News location operates the largest crane in the Western Hemisphere: “Big Blue,” a gantry crane capable of lifting 1,050 metric tons – the equivalent of two and a half Boeing 747s.

SN3 ensures our success with crane lifts with strong, detailed work planning that involves all those who will conduct the lifts, and engineered safety methods and procedures. In addition, we emphasize safety during all such lifts. HII safely conducts nearly a million documented lifts of greater than 10 tons annually.

Safeguards & Security

SN3 routinely complies with a variety of laws, regulations, standards, and customer requirements to support our nuclear operations safely, and to ensure the security of information, processes, and materials. These include:

  • Information Security
  • Personnel Security
  • Safeguards & Security for Nuclear Material
  • Project Security Planning
  • Command & Control

Special Nuclear Material & Spent Nuclear Fuel Management

SN3 and its personnel are experienced in defueling and inactivation of nuclear reactors, managing reactor plant test engineering and refueling engineers, and engineering of lifting and handling of Special Nuclear Material (SNM), nuclear waste disposal, nuclear waste storage and handling, and nuclear waste transportation. We bring a demonstrated track record of leading large complex nuclear programs and managing nuclear storage facilities, with emphasis on engineering analysis, design, construction, production, risk mitigation, and facility management. SN3 carries a legacy of safely and successfully conducting more than 300 such projects incorporating more than 10,000 discrete nuclear material handling evolutions.

This experience includes all aspects of nuclear work, including reactor servicing; nuclear facilities infrastructure maintenance and management; SNM and Spent Nuclear Fuel (SNF) handling, storage; and management; propulsion and reactor plant overhaul; design engineering, emergency response, waste management, reactor defueling, and SNM storage facilities.

Radiological Waste Management

Waste DisposalSN3 has cradle-to-grave waste management expertise, including large decontamination and decommissioning (D&D) projects. We assist our clients in identifying options for treatment, reduction and disposal for a variety of hazardous, radioactive, and mixed waste streams at CERCLA sites and RCRA facilities. SN3’s commitment to the environment ensures that we strive to evaluate and assess remediation technologies that generate little or no waste. Our waste management services include:

  • Characterization
  • Minimization
  • Packaging
  • Storage
  • Scheduling & Transportation
  • Treatment
  • Disposal
  • Regulatory Compliance

Facility & Asset Management

SN3’s Asset Management experience is based on CONOPS, maintenance, facility and program management, and infrastructure. SN3 has extensive and well-coordinated inspection and maintenance programs for equipment, systems, and facilities that support all activities including nuclear operations. Our inspection programs are linked to production schedules and future program planning, and allow for maintenance activities, system upgrades, and capital projects to be scheduled well in advance, facilitating the funding process for corporate and government budget cycles and allows for improvements to work with project schedules.

SN3 provides long-term environmental surveillance and monitoring, real and personal property management, facility management and beneficial reuse, including Federal Information Management System (FIMS) and Integrated Facilities Infrastructure (IFI) reporting for 273 assets and 7,398 data elements, 34 buildings comprised of 229,993 square feet; 54 miles of roads; and 94 miles of fencing.