Lead, Nuclear Criticality Safety

General Matter•Los Angeles, CA

2d•Onsite

About The Position

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. Your criticality safety evaluations (CSEs) are a foundational input into our Integrated Safety Analysis (ISA), meaning the double-contingency approach, methodology, and technical judgment you establish now will shape how this facility operates for decades. This is a rare opportunity to set the criticality safety strategy for a next-generation enrichment facility rather than inherit one — and to do it at a company where your technical decisions have a direct line to whether we get licensed and operating on schedule. We're especially looking for engineers who've done this before at an NRC-licensed Part 70 facility, or who bring deep DOE criticality safety experience and are ready to translate that rigor into the NRC licensing framework. If you've spent your career fitting criticality safety work into someone else's program and are ready to build the program instead, we encourage you to apply and lead this work at General Matter.

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.

Nice To Haves

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.

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.