X-energy · 1 month ago
Senior Thermal Analysis Engineer
Rockville, MD
Full-time
Hybrid
Senior Level, Lead/Staff
$131K/yr - $218K/yr
15+ years expX-energy LLC is seeking a Senior Thermal Analysis Engineer responsible for the engineering design and development of mechanical systems, structures, and components. This role includes concept development, analysis, prototyping, testing, and ensuring that systems meet all technical specifications and requirements.
Clean EnergyCleanTechEnergyNuclearRenewable Energy
Responsibilities
Develop mechanical/physical concepts, design and support development of processes to create or identify structures, systems, and components (SSCs) for use in nuclear products or facilities with a focus on nuclear safety
Identify, collect, and document applicable requirements, interfaces, design basis and criteria by coordinating with key stakeholders/systems engineers and support identifying applicable industry codes and standards and the direction of project leads and systems engineers
Planning and performing the analysis required to assess aspects of the SSCs to ensure they can perform their intended functions and meet technical specifications and design requirements
Perform computations utilizing hand calculations and analytical tools for structural, thermal, hydraulic, and other scoping calculations as required at the direction of project leads and systems engineers to ensure SSCs can meet technical requirements
The role may include specialization in one or more of the following areas:
Thermosystems
Perform system-level thermodynamic analyses and process design using system-level simulation codes to support design iterations of X-energy developed reactors and supporting subsystems
Support the sizing and analysis of components including heat exchangers, pumps, circulators, and turbomachinery
Support the development of reactor and plant control philosophy and implement in plant models, simulations, and digital twins
Support the assessment of SSCs for manufacturability as well as assembly and integration considerations at the direction of project leads
Write and develop design documentation including design basis documents, technical reports, calculations, and drawings in accordance with applicable procedures
Develop Verification and Validation (V&V) plans for analytical tools and support qualification of toolset
Perform work in accordance with X-energy quality procedures for design and configuration management to ensure project quality requirements are met
Provide independent reviews and acceptance reviews of engineering deliverables and data
Lead the execution of the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, without close supervision and extensive latitude for independent judgement
Teach and mentor more junior team members
Stay abreast of industry and academic trends, breakthroughs, and best practices
Maintain professional demeanor and behavior at all times in all forms of communication
Perform other duties as assigned by manager
Qualification
Required
Bachelor's degree in mechanical engineering, or related engineering discipline (e.g., nuclear aerospace, chemical, etc.) from an accredited institution required
Typically, fifteen years of experience in an engineering role required
A master's degree in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of two years of experience
A Ph.D. in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of three years of experience
Previous experience at X-energy exceeding performance standards may be in lieu of years of experience
Proficiency with engineering hand calculations is required
Experience and/or knowledge in a minimum of one of the following areas: Thermodynamics - Use of 1D flow-solvers performing heat/energy and mass balance (e.g., RELAP, Flownex, NPSS, SINDA/FLUINT, Flomaster, or similar)
Preferred
Nuclear industry background
Experience with 1D thermal-hydraulics modeling both steady-state and transient
Benefits
401K plan with an employer match
Medical/Dental /Vision Insurance
Life and Disability Insurance
Paid Time Off
Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees
Company
X-energy
X-energy is a nuclear energy company that develops small modular nuclear reactors and nuclear fuels for clean energy generation.
501-1000 employees
H1B Sponsorship
X-energy has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
2024 (1)
2022 (2)
2020 (1)
Funding
Current Stage
Late StageTotal Funding
$1.71BKey Investors
Jane Street CapitalPittco ManagementDepartment for Energy Security & Net Zero
2025-11-24Series D· $700M
2025-03-05Private Equity· $22.8M
2024-10-16Series C· $700M
Leadership Team
J. Clay Sell
Chief Executive Officer
Robert Taylor
Vice President, Regulatory Affairs and Licensing
Recent News
2026-01-06
Crunchbase News
2025-12-17
Company data provided by crunchbase