{"id":2861434,"url":"https://alion.io/job/aalo-atomics-criticality-safety-engineer","title":"Criticality Safety Engineer","company":{"id":668768,"name":"Aalo Atomics","domain":"aalo.com","url":"https://alion.io/company/aalo","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Rippling","truth_index":{"grade":"A","score":94,"open_postings":40,"ghost_share":0,"stale_share":0.05,"repost_share":0,"time_to_fill_p50_days":84,"computed_at":"2026-10-31T05:58:55Z"}},"role":"Energy","role_family":"Energy","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Idaho Falls, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":100000,"max_usd":181000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":148},"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"MCNP","optional":false}],"status":"live","first_seen_at":"2026-10-19T13:38:19Z","employer_posted_date":"2026-10-19","last_verified_at":"2026-10-31T12:40:51Z","board_verified":true,"closed_at":null,"days_open":12,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":12},"description":"About Aalo Atomics\nAalo Atomics is pioneering a new era in clean energy with factory-fabricated microreactors designed to deliver affordable, scalable, and reliable nuclear power. Our mission is to make nuclear energy globally accessible, starting with the Aalo-1, a 10 MWe reactor leveraging cutting-edge safety, modularity, and efficiency. Based in Austin, TX, we’re rapidly growing as we work to deploy the world’s first fleet of advanced microreactors. Join us and help revolutionize energy for a sustainable future.\nAbout the role\nWe are seeking a Criticality Safety Engineer to perform criticality safety evaluations, develop and maintain criticality safety controls, and serve as a Criticality Safety Officer (CSO) for assigned facilities at the Aalo-X campus. Reporting to the Nuclear Safety Manager, this role is responsible for ensuring that all operations involving fissionable materials comply with DOE criticality safety requirements and applicable ANSI/ANS-8 series standards. You will perform independent criticality safety analyses, check and review the work of others, and provide technical guidance to operations, design, and facility management teams.\nAs a CSO for assigned Criticality Control Areas, you will also serve as the on-the-ground liaison between Criticality Safety Engineering and facility operations, performing regular walkdowns and surveillance, advising operating personnel on criticality safety limits and controls, and ensuring that new or modified equipment and activities are covered by active criticality safety evaluations. This combined engineering and facility oversight role requires deep technical expertise in nuclear criticality safety, strong analytical skills, and the ability to communicate complex safety requirements clearly to diverse technical and operational audiences.\nWhat you'll do\nPerform criticality safety evaluations (CSEs) independently in accordance with DOE-STD-3007, including scoping calculations for design, technical guidance, and formal safety basis analyses.\nCheck and verify criticality safety evaluations for accuracy, including performing independent calculations and analyses to confirm that all evaluation requirements have been met.\nPerform criticality safety reviews and assessments of existing facilities and planned activities, including facility modifications and process changes.\nReview safety basis documents, proposed safety basis documents, and facility/process modifications for criticality safety implications.\nOversee and support the implementation of the Aalo Atomics Criticality Safety Program requirements, limits, and controls across assigned facilities.\nServe as the Criticality Safety Officer for assigned Criticality Control Areas, acting as the facility advocate for criticality safety and liaison between facility management and Criticality Safety Engineering.\nPerform regular facility walkdowns and surveillances to maintain familiarity with operations and verify compliance with criticality safety controls.\nAdvise operating personnel and supervision on conformance to criticality safety limits and requirements, and identify when Criticality Safety Engineering consultation is needed.\nAuthorize the implementation of new or modified equipment and activities within assigned Criticality Control Areas, ensuring they are covered by active CSEs and the criticality safety basis.\nParticipate in the development and approval of facility-specific criticality safety controls, including attending review meetings and concurring with facility criticality controls.\nProvide guidance to operations and facility management on the identification of violations and areas of concern related to criticality safety.\nSupport the development and maintenance of criticality safety documentation, including the Criticality Safety Program plan, procedures, and training materials.\nCoordinate with nuclear safety, design engineering, and operations teams to ensure criticality safety requirements are integrated into facility design and operational procedures.\nSupport development of recovery plans and emergency response procedures related to criticality safety events.\nPerform or support Unreviewed Safety Question (USQ) evaluations for changes with potential criticality safety implications.\nQualifications\nBachelor of Science degree in Nuclear Engineering, Nuclear Physics, Physics, or a closely related scientific or engineering discipline.\n8+ years of experience in nuclear criticality safety, including the independent preparation and review of criticality safety evaluations at DOE nuclear facilities.\nProficiency with Monte Carlo neutron transport codes (e.g., MCNP, SCALE, OpenMC, or Serpent) for criticality safety analysis.\nStrong working knowledge of DOE criticality safety requirements, including 10 CFR 830, DOE Order 420.1 Chapter III, and DOE-STD-3007.\nThorough familiarity with the ANSI/ANS-8 series standards for nuclear criticality safety.\nExperience reviewing and assessing safety basis documents for criticality safety adequacy.\nDemonstrated ability to perform independent criticality safety assessments of facilities, processes, and proposed modifications.\nStrong technical writing and communication skills, with the ability to prepare clear and defensible criticality safety evaluations and technical reports.\nEffective interpersonal skills with the ability to communicate criticality safety requirements to operations, design, and management personnel.\nKnowledge of nuclear criticality safety training and qualification requirements per ANSI/ANS-8.26.\nPreferred Qualifications\nAdvanced degree (M.S. or Ph.D.) in Nuclear Engineering, Nuclear Physics, or a related discipline.\nExperience serving as a Criticality Safety Officer with facility-specific oversight responsibilities.\nHands-on criticality safety training or practical experience with parameters affecting neutron multiplication of fissionable material systems.\nExperience with validation of neutron transport methods per ANSI/ANS-8.24, including benchmark experiment selection and bias determination.\nFamiliarity with DOE-STD-3009 and the integration of criticality safety into Documented Safety Analyses.\nExperience with criticality accident alarm systems design and evaluation per ANSI/ANS-8.3.\nKnowledge of transportation criticality safety requirements, including 10 CFR 71 and 49 CFR 173.\nExperience supporting DOE readiness assessments, Operational Readiness Reviews, or similar authorization activities for criticality safety.\nBackground in advanced reactor fuel handling, storage, and processing operations.\nFamiliarity with Integrated Safety Management System principles as applied to criticality safety.\nWork Environment\nCombination of office and field environment at the Aalo-X campus.\nRegular facility walkdowns in Criticality Control Areas with appropriate PPE and access controls.\nOccasional travel to DOE headquarters, other Aalo locations, or industry events as required.\nWhat Success Looks Like\nCriticality safety evaluations that are technically rigorous, clearly documented, and defensible under DOE review.\nAssigned Criticality Control Areas operating in full compliance with criticality safety controls and limits.\nEarly identification and resolution of criticality safety concerns in facility modifications, new activities, and design changes.\nStrong working relationships with operations, design, and facility management teams, built on clear communication and trusted technical judgment.\nA well-maintained criticality safety basis with current evaluations, controlled documentation, and effective configuration management.\nSuccessful support of DOE authorization milestones and readiness assessments for criticality safety.\nWhat It Takes to Succeed at Aalo\nWe’re building technology that will help reshape the future of energy. The pace is fast, the problems are difficult, and the expectations are high. Successful team members consistently demonstrate:\nExtreme Ownership - You take responsibility for outcomes, not just tasks. You proactively identify problems, drive solutions, and follow through.\nA Passion for Solving Hard Problems - You are energized by challenges that others avoid and enjoy finding practical solutions to complex technical issues.\nA Sense of Urgency - You move quickly, make thoughtful decisions, and maintain momentum while balancing quality and execution.Requirements:\n\nBased in the United States\nWilling to work on-site in Idaho Falls, ID\nWhat We Offer:\nCompetitive salary based on experience\nHealth, Dental, Vision Insurance\nPaid Time Off\nCorporate Gym Membership\nAdditional Information:\nAalo Atomics provides a collaborative and supportive work environment, opportunities for professional growth, intellectually challenging careers, and competitive compensation. Aalo Atomics is an equal opportunity employer and considers all employment decisions without regard to race, color, religion, national or ethnic origin, sex, sexual orientation, gender identity or expression, age, disability, veteran status, or any other characteristic protected by law.\nApplicants must be U.S. Citizens or U.S. Persons in compliance with 10 CFR Part 810 and may not hold non-compliant foreign citizenships.\nDirect applicants only. 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