Lead, Nuclear Criticality Safety
General MatterLos Angeles, CA
Full Time
Posted September 1, 2026
$160k - $230k
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Listing evidence and provenance
- Source
- Greenhouse View original listing
- Freshness
- Open in the current public read path; this is not an employer guarantee.Last observed October 5, 2026
- Classification
- Modern power-system classification not yet published for this listing.Legacy source industry field: Nuclear Energy
- Pay provenance
- Employer-provided pay
Job Description
As Lead Nuclear Criticality Safety Engineer at General Matter, you'll build and lead the criticality safety program for a Part 70 fuel cycle facility from the ground up.
Key Responsibilities
- Own the criticality safety program end-to-end: set methodology, double-contingency strategy, and technical direction for the site.
- Develop and maintain nuclear criticality safety evaluations (CSEs) for processes involving fissile materials, and ensure CSE outputs are correctly integrated into the ISA as a foundational safety basis input.
- Perform criticality safety analyses using computational methods and tools (e.g., SCALE, MCNP) to assess system safety and regulatory compliance.
- Serve as the primary technical point of contact on criticality safety matters during NRC licensing interactions, license amendments, and inspections.
- Ensure compliance with NRC, DOE, and ANSI/ANS criticality safety standards and regulations, translating DOE-derived methodologies into the NRC regulatory framework where applicable.
- Mentor and provide technical review for other criticality safety engineers, setting the technical bar for the team as it grows.
- Conduct audits, inspections, and reviews of facility operations to identify and mitigate criticality safety risks.
- Collaborate with engineering, operations, and regulatory teams to implement effective safety measures.
- Provide technical guidance and training to personnel on criticality safety principles and procedures.
- Investigate criticality safety incidents and develop corrective actions as necessary.
- Maintain accurate documentation and records to support audits and regulatory reviews.
Requirements
- Evidence of exceptional ability (prior projects, portfolio of work, completed products, etc.).
- 8+ years of nuclear criticality safety experience, including direct authorship of criticality safety evaluations at a DOE or NRC-licensed facility.
- Bachelor's degree in Nuclear Engineering, Physics, or a related field.
- Strong knowledge of criticality safety regulations, standards, and methodologies (e.g., 10 CFR Part 70, ANSI/ANS-8 series), and the ability to bridge DOE and NRC frameworks where they differ.
- Proficiency in computational tools such as SCALE, MCNP, or similar software.
- Ability to perform trade studies and make clear recommendations using first principles and engineering fundamentals, even with partial information.
- Strong verbal and written communication skills, with the ability to convey technical information to regulators, operators, and leadership alike.
- Ability to obtain and maintain required security clearance and access authorization.
- Direct experience standing up or significantly revising a criticality safety program at an NRC-licensed Part 70 facility.
- DOE weapons complex or national laboratory experience (e.g., Y-12, Savannah River, Los Alamos, Pantex, Idaho National Laboratory) with demonstrated ability to translate that experience into an NRC licensing context.
- Certification as a Nuclear Criticality Safety Engineer (e.g., ANSI/ANS-8.24).
- Professional Engineer (PE) license, or ability to obtain one.
- Advanced degree in Nuclear Engineering, Physics, or a related field.
- Experience in a fast-paced engineering environment or a highly technical role requiring a resourceful, entrepreneurial approach to complete tasks within tight timeframes or budget constraints.
- Ability to work extended hours and weekends as necessary.
Benefits & Perks
- The base salary range for this role is $160,000–$230,000 annually.
- Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case-by-case basis and may vary based on job-related skills, education, experience, technical capabilities and internal equity. Please note that the stated salary range is an estimate and may be adjusted based on market conditions, business needs, or other factors. In addition to base salary, for full-time hires, you may also be eligible for long-term incentives, in the form of stock options, and access to medical, vision & dental coverage as well as access to a 401(k) retirement plan.
Ready to Apply?
Apply directly on General Matter's site
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