Mechanical System Design Engineer

Welcome to BWXT

We believe in empowering our employees and cultivating a dynamic workplace that fosters growth and collaboration. Whether you’re an experienced professional or just starting your career, you'll find opportunities to challenge yourself, learn from seasoned experts, and contribute to nuclear innovation. We require a diverse range of skills to support our work in the markets that drive our business and welcome candidates from all backgrounds and life stages who are passionate about making a difference.

BWXT Advanced Technologies is seeking a Mechanical System Design Engineer. This position is focused on system design, not detailed component design, and will report administratively to the Mechanical System Design Supervisor. The System Design Engineering group supports programs for internal and external customers across Advanced Manufacturing, Medical Radioisotopes, and Nuclear Reactor Design.

On-site in Lynchburg, Virginia

• Identify relevant system requirements and interface requirements then prepare appropriate system design documentation such as system design descriptions and control narratives.
• Select components (e.g., valves, heat exchangers), perform basic calculations, and prepare specifications for their detailed design.
• Design piping systems including line sizing and pressure drop calculations.
• Create appropriate output documentation such as process flow diagrams, P&IDs, component data sheets and system test request documentation.
• Utilize appropriate regulations, design codes and standards (e.g., ASME) for fluid systems.
• Coordinate with other interfacing disciplines such as electrical engineers, I&C engineers, mechanical equipment designers, and test engineers.
• Prepare and present system design results to internal and external stakeholders.

• A Bachelor’s degree in Physics or an Engineering discipline is required.
• A minimum of four (4) years of relevant work experience is required.
• Must possess a technical background in mechanical engineering design, fluid systems, thermodynamics, and process instrumentation.
• Proficiency with standard Microsoft Office applications is required.
• Excellent written and verbal communication skills are required.
• Must possess the ability to self‑direct with minimal day‑to‑day supervision.
• Must be a U.S. citizen.
• Must be able to obtain and maintain a U.S. Department of Energy (DOE) or Department of Defense (DOD) security clearance, whichever is required.

• Experience with Mat Lab, and/or Math Cad.
• Experience with 2D or 3D computer modeling.
• Pipe Stress Analysis experience.
• Experience with system analysis tools such as Simulink, Flownex, Relap, or Gothic.

• Competitive salary and benefits package, including health, dental, and retirement plans.
• Flexible work schedules and paid time off to promote a healthy work‑life balance.
• Professional development opportunities, including mentorship programs and sponsorship for continuing education.
• An inclusive atmosphere that celebrates new perspectives and supports collaboration between different generations.
• The chance to be part of a mission‑driven organization making a positive impact on the future of energy.
• Opportunities for continuous learning and training to grow throughout your career!

Pay: $85,000- $134,000

The base salary range for this position in Virginia (US-VA) at the start of employment is expected to be between $85,000 and $134,000 per year. However, the base salary offered is based on local job market factors, and may vary further depending on factors specific to the selected job candidate, such as job‑related knowledge, skills, experience, and other objective business considerations.

Subject to these considerations, the total compensation package for this position may also include other elements, such as an annual cash incentive in addition to a full range of medical, retirement, and/or other benefits. Details of participation in these benefit plans will be provided at such time the selected job candidate receives an offer of employment. If hired, the selected job candidate will be…