Senior Mechanical Engineer ASME Lead

TerraPower·Bellevue, Washington, United States·Posted today

Nuclear industryUS only

About this role

Senior Mechanical Engineer leading ASME Section III design, analysis, and certification of pressure boundary components for TerraPower's Natrium Generation IV sodium-cooled fast reactor. Design and certify reactor vessels, piping, valves, heat exchanger elements, and associated subcomponents to NRC standards while collaborating with multidisciplinary teams on next-generation nuclear reactor technology.

Responsibilities

—Perform detailed design, analysis, and documentation for ASME Section III Class HB pressure boundary components, including vessels, piping, valves, heat exchanger elements, and associated subcomponents
—Prepare design specifications, design reports, load evaluations, stress analyses, and code compliance calculations in accordance with ASME Section III rules and NRC guidance
—Conduct pressure boundary evaluations including fatigue, thermal, seismic, and time-dependent material evaluations
—Collaborate with multidisciplinary engineering teams to define design requirements, resolve technical issues, and optimize component performance
—Interface with internal quality teams, third-party reviewers, and regulatory bodies to support audits, design reviews, and code certification processes
—Support development of fabrication drawings, weld requirements, inspection criteria, material selection, and acceptance standards
—Participate in engineering change processes, nonconformance evaluations, and corrective action development
—Maintain current knowledge of ASME Section III revisions, NRC guidance, and industry best practices
—Provide technical mentorship to junior engineers as needed

Qualifications

—B.S. degree in Mechanical Engineering or equivalent
—Minimum eight years of equipment/component design experience (relevant M.S. degree credited as two years of experience)
—Active Professional Engineer (P.E.) license
—Working experience with ASME Boiler and Pressure Vessel Code Section III
—Demonstrated experience certifying Design Specifications and Design Reports for nuclear pressure-retaining components
—Deep understanding of ASME Section III, NQA-1, and related NRC regulations
—Experience in finite element stress analysis and commercial mechanical stress analysis modeling tools, with emphasis on ANSYS
—Excellent writing and communication skills
—Strong analytical and problem-solving skills