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Senior Nuclear Criticality Safety Engineer

Oklo· Fuel Recycling
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Hybrid (Santa Clara, CA (HQ) and remote)$135k - $175kfull-timePosted 3w ago

About the role

Senior Nuclear Criticality Safety Engineer at Oklo responsible for criticality safety evaluations, safety basis development, and architecting the nuclear criticality safety program for a first-of-a-kind used nuclear fuel recycling facility.

Responsibilities

  • Identifying and evaluating nuclear criticality safety (NCS) hazards for fuel cycle facilities
  • Performing criticality safety evaluations (CSEs) to demonstrate subcriticality under normal and credible abnormal conditions
  • Developing the criticality code validation report
  • Demonstrating compliance with the double-contingency principle
  • Documenting criticality hazard analyses, CSEs, and supporting technical information
  • Evaluating and implementing controlled parameters for the NCS program
  • Developing the criticality accident alarm system and inadvertent criticality emergency response plan
  • Supporting safety basis development and licensing efforts
  • Developing and administering the NCS program, methodologies, and management measures

Qualifications

  • Bachelors, Masters, or PhD in nuclear engineering, chemical engineering, or chemistry, or related field
  • Minimum 5+ years experience performing CSEs as a part of a nuclear facility’s safety basis

Skills

Required:Nuclear criticality safety (NCS)Criticality safety evaluations (CSEs)Criticality codesRegulatory knowledgeSafety basis developmentTechnical writingStartup / fast-paced environment

Benefits

  • flexible time off
  • equity
  • competitive pay
  • 401k
  • health insurance
  • FSA
  • flexible work hours
  • other benefits
Last updated Oct 2, 2026. Interested? Apply on the company site.
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About Oklo

Emission free, always on power from advanced fission power plants.

About Oklo Inc.: Oklo Inc. (Oklo) is developing advanced fission power plants to provide emission-free, reliable, and affordable energy. Oklo received a Site Use Permit from the U.S Department of Energy, has performed successful prototypic fuel fabrication, was awarded fuel material from Idaho National Laboratory, developed the first advanced fission combined license application accepted and docketed by the U.S. Nuclear Regulatory Commission, and is developing advanced fuel recycling technologies in collaboration with the U.S. Department of Energy and national laboratories. Oklo has been featured in Time, Newsweek, Wall Street Journal, CNBC, Popular Mechanics, Wired, Architectural Digest, Hyperallergic, POWER Magazine, has been the subject of a Harvard Business School case, and is featured in the Oliver Stone documentary Nuclear, among other features.

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