Principal Safety Methods Engineer (Nuclear)

Location: Bellevue, Washington, United States

Salary: $131,828–$171,205 per year

Company

hirify.global is a nuclear technology company developing advanced nuclear reactors, hybrid energy systems, and medical isotope applications.

What you will do

• Develop, improve, and qualify plant-scale thermal-hydraulic analysis methods and system-level models for the Natrium reactor.
• Support verification, validation, and uncertainty quantification for thermal-hydraulic analysis tools.
• Develop code assessment plans, validation matrices, test selections, and quantitative model-to-test comparison methods.
• Perform scaling analyses and assess similarity criteria, scaling distortion, and the applicability of experimental data to reference plant conditions.
• Define validation needs and test requirements while coordinating with test engineering and experimental programs.
• Document methodologies, assumptions, validation results, and uncertainty analyses for design processes and regulatory submissions.

Requirements

• Degree in Mechanical, Nuclear, Chemical Engineering, or a related field.
• 8+ years of experience in system-level thermal-hydraulic analysis and code assessment for nuclear or complex energy systems.
• Experience with model-to-test comparisons, validation metrics, uncertainty quantification, and experimental thermal-hydraulic data analysis.
• Proficiency with plant-scale system analysis tools such as RELAP5-3D, TRACE, SAS, or equivalent.
• Experience with scaling analysis, similarity criteria, validation strategies, and coordination with experimental programs.
• Must satisfy ANSI/ANS 3.1 qualification requirements and applicable nuclear industry experience criteria.

Nice to have

• Experience with SQA and NQA-1 quality assurance practices for modeling workflows.
• Experience mentoring junior engineers in system modeling and validation methodologies.

Culture & Benefits

• Full-time employment with competitive compensation and eligibility for discretionary short-term incentive payments.
• Medical, vision, dental, life, disability, and wellness benefits.
• Parental leave, 21 accrued PTO days annually, and 10 paid holidays.
• 401(k) plan, relocation assistance, and professional and educational support.
• Physical requirements include prolonged sitting and keyboard work, minimal exertion, and the ability to safely lift up to 25 pounds; travel is expected at 0–10%.