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Reactor Analysis & Modeling Program Lead

Date: Dec 27, 2021

Location: Oak Ridge, TN, US, 37830

Company: Oak Ridge National Laboratory

Requisition Id 6160 


The Nuclear Safety and Experiment Analysis (NSEA) Group within the Research Reactors Division (RRD), Neutron Sciences Directorate (NScD) seeks applications for the Reactor Analysis and Modeling Program Lead position at the High Flux Isotope Reactor. We are seeking a highly motivated reactor analyst who is comfortable working in a team environment, with collaboration at all levels, disciplines, and diverse cultural backgrounds both inside and outside the organization. The successful candidate should have a strong background in nuclear reactor analysis, an interest in a variety of nuclear engineering disciplines, and the ability to lead a technically diverse analysis and modeling program in support of HFIR.

Major Duties and Responsibilities:

  • Provide programmatic leadership to the team of technically diverse reactor analysts who support HFIR nuclear safety, experiment analysis, and research activities through modeling, analysis, and engineering evaluations
  • Lead by example by performing high-quality reactor modeling, simulation, and analysis activities to support the nation’s most versatile research reactor
  • Mentor reactor analysis and modeling staff and manage the scope of the reactor analysis and modeling program
  • Provide relevant input to assist the NSEA Manager and Team Leads to support safe, reliable, and efficient operations as well as the RRD’s milestones and scientific missions
  • Work with the Experiments and R&D Programs Team and experimentalists to support programmatic missions, such as isotope production and materials irradiation
  • Collaborate on projects, such as the high-enriched uranium to low-enriched uranium fuel conversion project
  • Support the use of computer clusters and simulation codes, including software quality assurance activities to meet applicable regulations
  • Perform safety analyst role for assigned systems, such as fuel and control elements, including evaluations through the Unreviewed Safety Question (USQ) process
  • Collaboratively work with the RRD NSEA Nuclear Safety and Experiments staff; others within RRD (e.g., Systems Engineering, Operations); and other ORNL directorates and divisions to support RRD and ORNL missions
  • Thoroughly document and present work performed to meet project deliverables
  • Prepare and review publications to document reactor analysis and modeling for HFIR and associated research programs
  • 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 and human performance improvement initiatives
  • Publish technical reports and non-neutron scattering research papers in support of the ORNL and Neutron Sciences missions.
  • Ensure compliance with Environment, Safety and Health (ES&H) and QA requirements.
  • 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:

  • Master’s degree in nuclear engineering, mechanical engineering, engineering physics, or a related technical field with 10 or more years of relevant experience
  • Possess a strong reactor analysis background in a related discipline, such as reactor physics or thermal-hydraulics, as demonstrated through graduate thesis research, publications, and/or work experience
  • 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:

  • Ph.D. degree with 5 or more years of relevant experience 
  • Experience modeling and analyzing research reactors with software, such as MCNP, SCALE, COMSOL, and RELAP
  • Experience and knowledge of the multi-physics reactor engineering framework, including the interplay between reactor physics, thermal-hydraulics, thermal-structural interaction, fluid dynamics, transient analysis, and accident analysis
  • Ability to set priorities to accomplish multiple tasks with varying requirements and deadlines
  • 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

Other Job Requirements:

This position requires the ability to obtain and maintain a DOE “L” clearance.


This position is a Workplace Substance Abuse program (WSAP) testing designed position which requires passing a pre-placement drug test and participation in an ongoing random drug testing program in which employees are subject to being randomly selected for testing. The occupant of this position will also be subject to an ongoing requirement to report to ORNL any drug-related arrest or conviction or receipt of a positive drug test result.


About Our 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

Benefits at ORNL:
UT-Battelle offers a quality benefits package, including a matching 401(k), contributory pension plan, paid vacation, and medical/dental plan options.  Onsite amenities include a credit union, medical clinic, cafeteria, and fitness facilities.

Moving can be overwhelming and expensive.  UT-Battelle offers a generous relocation package to ease the transition process.  Domestic and international relocation assistance is available for certain positions.  If invited to interview, be sure to ask your Recruiter (Talent Acquisition Partner) for details.

For more information about our benefits, working here, and living here, visit the “About” tab at




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.

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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.

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