Fuel Engineer F/H

TSSD Services, Inc. (TSSD) was founded in 1999 and is a leading provider of professional and technical staffing solutions. TSSD currently maintains experienced professionals, providing services in the energy and utility sectors, with a focus on the nuclear industry. TSSD excels in decommissioning and environmental remediation, expertly managing decontamination, demolition, and site remediation projects. We handle the segregation, packaging, and disposal of low-level radioactive, hazardous, and clean demolition wastes, ensuring safe and efficient outcomes every time. Our experienced team has a proven track record of successfully managing safe, efficient, and cost-effective projects.

ABOUT THE ROLE

TSSD is seeking experienced Fuel Engineers to support a U.S. fuel manufacturer on analysis, design, and optimization of fuel and core systems. Successful candidates will bring depth in one or more of the following disciplines:

• Thermal/Mechanical • Heat transfer, thermodynamics, structural mechanics
• Hydraulic • Fluid dynamics, core/fuel assembly hydraulics, system behavior
• Safety Analysis • Transient/accident analysis, licensing basis assessments
• Codes & Methods • Development, application, verification & validation of analytical methods and software

Work is performed, primarily remotely, with sporadic travels as needed for integration, reviews, or on-site coordination.

KEY RESPONSIBILITIES

• Fuel performance & design analysis: Evaluate fuel and component behavior under normal, AOO, and accident scenarios; quantify margins and identify design improvements.
• Thermal hydraulic modeling: Build and maintain models for core/assembly flow, pressure drop, CHF/MDNBR, and heat transfer; perform sensitivity/uncertainty studies.
• Safety & licensing support: Execute transient/accident analyses (e.g., LOCA, RIA, loss of flow/heat sink); prepare inputs for safety case and regulatory submittals.
• Codes & Methods: Apply and (as assigned) enhance validated analysis methods; perform model V&V, document assumptions and biases, and maintain configuration control under quality procedures.
• Technical documentation: Produce clear calculation files, engineering memos, and customer facing technical reports; present results to internal and client design authorities.
• Data & testing: Define or review test plans, analyze test data, and reconcile model to test results for model improvement.
• Cross functional collaboration: Work with fuel design, materials, thermal hydraulics, manufacturing, and safety/licensing teams to drive integrated solutions.
• Standards & compliance: Follow applicable industry codes/standards and internal QA practices; contribute to continuous improvement of engineering workflows.

REQUIREMENTS

• BS in Nuclear, Mechanical, Chemical, or related Engineering (MS/PhD preferred for Safety Analysis or Methods roles).
• 3+ years directly relevant experience in at least one focus area: Thermal/Mechanical, Hydraulic, Safety Analysis, or Codes & Methods.
• Hands on experience with engineering analysis and model development; proficiency in data analysis and scripting (e.g., Python/Matlab) and version control (e.g., Git).
• Background with fuel performance, core thermal hydraulics, or safety analysis for light water reactors or comparable technologies.
• Experience preparing inputs for licensing or interacting with customer/regulatory stakeholders.
• Familiarity with common industry codes and solvers (examples may include fuel performance, TH system, sub channel, neutronics, or Monte Carlo tools), and with QA governed engineering processes.
• Knowledge of materials behavior (e.g., fuel, cladding, structural materials) under irradiation and thermal mechanical loads.
• Strong communication and collaboration skills in a multi-disciplinary, remote environment.

WHY US?

WHAT WE OFFER

• Employment Type: Full Time (project-based engagements may also be available).
• Location: Remote (U.S.) with periodic travel.
• Start: Targeting January 2026
• Opportunity to contribute to a high impact U.S. fuel manufacturing program in a modern, remote first setup with purposeful onsite collaboration.
• Competitive compensation and benefits aligned with role seniority and impact.
• A culture focused on safety, technical excellence, and pragmatic problem solving.