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Reactor Safety Analysis Nuclear Engineer

Oak Ridge National Laboratory
Oak Ridge, Tennessee, United States (on-site)
8 days ago



The Nuclear Safety and Experiment Analysis (NSEA) Section's Nuclear Safety & Reactor Analysis Group within the Research Reactors Division (RRD), Neutron Sciences Directorate (NScD), seeks applications for the Reactor Safety Analysis Nuclear Engineer position at the High Flux Isotope Reactor (HFIR). We are seeking a highly motivated Reactor Safety Analysis Nuclear Engineer who is comfortable working in a team environment, with collaboration at all levels, disciplines, and diverse cultural backgrounds, both inside and outside the organization. You should have a strong background in nuclear reactor modeling and/or experience in other related reactor analysis areas (e.g., heat transfer, computational fluid dynamics, structural mechanics, severe accident analysis, fission heat generation, radiological source term development, radiological material transport and dispersion, or reactor kinetics).

Major Duties/Responsibilities:
  • Support nuclear safety and experiment analysis activities, scientificresearchprojects, and the safe, reliable, and efficient operation of HFIR through reactor safety analyses and engineering evaluations
  • Perform HFIR modeling, simulation, and analysis activities using reactor physics, multiphysics, thermal hydraulics, and/or severe accident codes, such as MCNP, SCALE, COMSOL, RELAP5, MACCS, MELCOR and review similar calculations performed by others
  • Work with the experiment team and users to support scientific missions, such as isotope production (e.g., 238Pu, 252Cf), materials irradiation, neutron activation analysis, and gamma irradiation
  • Collaborate on high-enriched uranium to low-enriched uranium fuel conversion project activities, such as core design and performance optimization studies
  • Perform analysis in support of HFIR capability enhancement projects (HFIR SENSe, pressure vessel, beryllium or beam tube replacements)
  • Perform reactor startup evaluations, such as beginning-of-cycle control element position calculations and neutron source requirement evaluations
  • Perform analysis and calculations using computer clusters and simulation codes, including software quality assurance activities
  • Analyze HFIR fuel element simulation effects of design changes and supplier nonconformances
  • Perform nuclear safety analyst role for assigned systems, such as fuel and control elements, including evaluations through the Unreviewed Safety Question (USQ) process
  • Collaboratively work with RRD NSEA Experiments Group; others within RRD (e.g., Systems Engineering, Operations, Maintenance); and other ORNL directorates and divisions to support RRD and ORNL missions
  • Thoroughly document and present work performed to meet project deliverables
  • Serve on the Software Configuration Control Board for RRD and ensure applicable RRD and ORNL software Quality Assurance requirements are met
  • Ensure technical compliance with 10CFR830 Subparts A and B, affecting reactor safety, through implementation of ORNL Standards Based Management System (SBMS) and RRD procedures
  • Ensure adherence to the rules and regulations that govern the operation of a DOE nuclear facility and ensure compliance with environment, safety, health, and quality program requirements
  • Maintain a strong commitment to nuclear safety
  • Publish technical reports and research papers related to HFIR reactor physics or multi-physics analysis in support of the HFIR documented safety analysis and ORNL and Neutron Sciences Directorate missions.
  • As a member of the ORNL scientific community, you will be expected to commit to ORNL's Research Code of Conduct. Our full code of conduct, and a statement by the Lab Director's office can be found here:

Basic Qualifications:
  • Bachelor's degree in nuclear engineering, engineering physics, or a related technical field with at least 5 years of relevant experience (Master's degree in related field with at least 3 years of relevant experience or a PhD in related field with at least 2 years of relevant experience will also be considered)
  • Must be organized, detail-oriented, and sensitized to a nuclear safety culture
  • Demonstrated results-oriented problem-solving skills and a willingness to apply those skills to a variety of engineering problems
  • Excellent communication skills, including verbal, presentation, and writing skills
  • Capability to successfully function both independently and in small-to-moderate size teams

Preferred Qualifications:
  • Advanced reactor safety analysis expertise as demonstrated through graduate thesis research, publications, and/or work experience
  • Experience with neutron transport codes, such as MCNP, Shift, SCALE, and ADVANTG
  • Experience with finite element/volume/difference analysis tools such as COMSOL Multiphysics, Ansys, Abaqus, MOOSE, FRAPCON
  • Experience with system transient/severe accident analysis tools such as RELAP5/TRACE, MELCOR, MACCS, SCDAP, fuel-coolant interaction and mechanistic codes
  • Experience with fuel cycle depletion codes, such as VESTA, Shift, and SCALE
  • Familiarity and experience with research reactors
  • Experience with other reactor engineering disciplines, such as dispersion analysis, radiological source term development, thermal-hydraulics, thermal-structural interaction, computational fluid dynamics, materials science, or probabilistic risk assessment
  • Experience with LINUX or LINUX-like environments and scripting/computer languages, such as MATLAB, Python, and Fortran
  • Familiarity and experience with 10CFR830 Subparts A and B and the USQ process

Special Requirements:

L clearance:This position requires the ability to obtain and maintain a clearance from the Department of Energy. As such, this position is a Workplace Substance Abuse (WSAP) testing designated position. WSAP positions require passing a pre-placement drug test and participation in an ongoing random drug testing program.

Visa sponsorship is not available for this position.

About Neutron Sciences Directorate:
The Neutron Sciences Directorate (NScD) at Oak Ridge National Laboratory (ORNL) operates the High Flux Isotope Reactor (HFIR), the United States' highest flux reactor-based neutron source, and the Spallation Neutron Source (SNS), the world's most intense pulsed accelerator-based neutron source. Together these facilities operate 30 instruments for neutron scattering research, each year carrying out in excess of 1,000 experiments in the physical, chemical, materials, biological and medical sciences for more than 3,000 visiting scientists. HFIR also provides unique facilities for isotope production and neutron irradiation. To learn more about Neutron Sciences at ORNL go to .


This position will remain open for a minimum of 5 days after which it will close when a qualified candidate is identified and/or hired.

We accept Word (.doc, .docx), Adobe (unsecured .pdf), Rich Text Format (.rtf), and HTML (.htm, .html) up to 5MB in size. Resumes from third party vendors will not be accepted; these resumes will be deleted and the candidates submitted will not be considered for employment.

If you have trouble applying for a position, please email

ORNL is an equal opportunity employer. All qualified applicants, including individuals with disabilities and protected veterans, are encouraged to apply. UT-Battelle is an E-Verify employer.

Job Information

  • Job ID: 68467401
  • Workplace Type: On-Site
  • Location:
    Oak Ridge, Tennessee, United States
  • Company Name For Job: Oak Ridge National Laboratory
  • Position Title: Reactor Safety Analysis Nuclear Engineer
  • Job Function: Science

Please refer to the company's website or job descriptions to learn more about them.

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