Senior Mechanical Engineer; Balance of Plant) Remote

Senior Mechanical Engineer (Balance of Plant)

Remote, USA

Applied Atomics delivers firm, clean electricity with proven technology. We design, build, and operate nuclear plants directly alongside the facilities they power. With n o reactor science or new fuel to invent , we have n o reason to stall. We are the first fully integrated nuclear power provider built to deploy now. Founded by a team of engineers and operators who built the launch sites, test complexes, and factories behind SpaceX , designed and commercialized nuclear reactors, and ran billion-dollar asset portfolios , the team is now focused on clean power deployment.

Applied Atomics is b acked by Alpaca VC, Transition, and Morpheus Ventures.

About the role:

Applied Atomics is seeking a Sr. Mechanical Engineer to lead the design, development, and build-out of the balance-of-plant systems for our first-of-a-kind (FOAK) nuclear power plant. This includes major Rankin cycle systems such as the main steam system, condensate system, feedwater system, air-cooled condenser (ACC), heat exchangers, and related thermal-mechanical equipment. This is a highly impactful, senior engineering role. You will own major fluid and thermal systems end-to-end;

from concept development and analysis to detailed design, vendor engagement, procurement, integration, testing, and commissioning. This position is perfect for an engineer with deep experience designing industrial fluid systems, large-scale mechanical systems, or power-plant hardware;including those from aerospace (launch & test infrastructure), energy, oil & gas, chemical plants,turbo machinery, or thermal power backgrounds.

Why we need you

We are transitioning nuclear energy from a theoretical science into a practical reality, and that requires practical problem-solvers. We need engineers who are eager to take direct responsibility for their work and see it through to completion. Your role will be critical in transforming complex designs into safe, reliable, and operational power plants that will operate for decades to come.

What you will do

Key Responsibilities

• Ownershipofmajor balance-of-plant (BOP) systems, including but not limitedto:main steam system & piping, feedwater system, condensate system, air-cooled condenser systems, heat exchangers and auxiliary systems, turbine-side thermal cycle equipment & interfaces.
• Lead trade studies, concept development, and system architecture decisions to meet performance, reliability, safety, and cost targets.
• Develop mechanical and physical system design concepts for BOP structures, systems, and components (SSCs).
• Ensure designs comply with applicable design criteria, requirements, and system interfaces.
• Perform and/or review thermal, structural, and fluid analyses, using both hand calcs and FEA/CFD tools when required.
• Conduct detailed studies on (but not limited to):steam generator (turbine coupling), condenser performance, heat exchanger optimization, cycle efficiency, transient response and system dynamics.
• Develop and validate system simulations and analytical models.
• Apply engineering requirements derived from design basis documents, system interfaces, hazards, and safety analyses.
• Interpret and implement industry codes and standards (ASME,API, NRC, etc.).
• Participate in plant-level safety analyses, reliability evaluations, and performance assessments.
• Manage system development and implementation through all life cycle phases.
• Solve complex technical problems and deliver high quality engineering work products on time and within budget.
• Collaborate with interfacing system owners.
• Ensure proper thermal coupling and seamless integration across BOP, NSSS, and reactor systems.
• Source equipment suppliers, evaluate vendor capabilities, and support procurement efforts.
• Provide input to equipment specifications.
• Prepare, lead,and support system design reviews based (PDRs,CDRs, etc.).
• Develop design documentation, including (but not limited to) design basis documents, technical reports, calculations, design descriptions, and drawings.
• Support documentation for regulatory submissions (e.g., NRC).
• Create, review, and validate system simulations and analyses.
• Define and manage Bills of Materials (BOMs), component specifications, and configuration control.
• Develop manufacturing processes, assembly sequences,assembly &integration plans, and testing procedures.
• Support build, commissioning, and plant bring-up activities.
• Create and maintain CAD.
• Develop system…