Postdoctoral Appointee - Severe Accident Analysis Department

Sandia National Laboratories

Albuquerque, NM

ID: 7054836 (Ref.No. 665083)
Posted: December 13, 2018

Job Description

This postdoctoral position is a temporary position for up to one year, which may be renewed at Sandia's discretion up to five additional years. The PhD must have been conferred within five years prior to employment. Individuals in postdoctoral positions may bid on regular Sandia positions as internal candidates, and in some cases may be converted to regular career positions during their term if warranted by ongoing operational needs, continuing availability of funds, and satisfactory job performance. : We are seeking a postdoctoral researcher to perform detailed modern validation, uncertainty quantification, and calibration work. In addition, you will need to analyze legacy models, convert them into a more modern form, and work on development of new models. On any given day, you may be called on to: + Utilize a general understanding of nuclear power industry, current approaches for validation and uncertainty quantification, and the ability to analyze the current weaknesses in these approaches. You will also need the ability to move the state-of-the-art forward by improving these approaches; + Write technical reports, code manuals, conference papers, and journal papers as well as giving presentations to a wide variety of technical audiences; + Construct computer models in both FORTRAN and PYTHON. Model construction will include documentation and testing of the models developed. This requires understanding of the Best Estimate Plus Uncertainty approach supported by the Nuclear Regulatory Commission; + Do uncertainty quantification and calibration using the DAKOTA software from Sandia and, when needed, augmentation of DAKOTA with MATLAB tools. These models will be implemented in a residual based code that employs a nonlinear and linear solver strategy. Construction of residual equations, including spatial and temporal discretization methods, will be a large part of this work. This includes the building and solving of the Jacobian matrix. It requires understanding the relationships between the physics of the numerical models and the numerical methods used to solve them. + Work with teams of engineers to modernize the models from MELCOR2 for incorporation in MELCOR3 as well as the development of new models required for severe accident analysis. The development of these models will be documented in technical reports, code manuals, conference papers, and journal papers. This will include establishing the pedigree of accuracy for these legacy and new models; + Interact with both internal and external customers, both domestic and foreign, and participate with teams of expert engineers in the conduct of model development, validation, calibration, and uncertainty quantification. Significant external customer interactions can be an important aspect of this position.

Required:
+ PhD in Nuclear Engineering, Mechanical Engineering or relevant science/physics discipline; + Experience in model validation, calibration, and uncertainty quantification; + Experience in research environments; + Demonstrated technical writing and communication skills.

Desired:
+ PhD in Nuclear Engineering with significant prior experience in uncertainty quantification (Bayesian, Deterministic, and Wilks), model calibration (frequentist and Bayesian and machine learning), and quantified validation which included experimental uncertainty and model uncertainty; + Experience performing studies with both modern and legacy as well as high-resolution and low-resolution approaches for nuclear reactor safety simulation; + Demonstrated capability in self-motivated technical work; + Experience working with internal/external simulation engineers and understanding their approaches to safety analysis with quantified uncertainty (domestic, and international); + Proficiency/experience with uncertainty quantification codes such as DAKOTA and QUESO; + Proficiency/experience with thermal-hydraulics codes such as MELCOR, RELAP, TRACE, and CTF, etc.; + Proficiency/experience with CFD, neutron transport, and chemistry; + Proficiency/experience with multiple operating systems (e.g., Windows, Mac OS, and Linux) and hardware (laptops, desktops, and computing clusters); + Proficiency/experience with the Latex type setting system; + Proficiency/experience with both interpreted and compiled computer languages; + Demonstrated technical writing and communication skills evidenced by a publication record of both conference papers and peer reviewed journal papers; + Participation in international benchmarking problems.

Department Description:

The Severe Accident Analysis Department (6232) has a specific focus on the modeling of severe accidents in nuclear power plants, developing computer codes to predict core melt down and radiological releases associated with such accidents. We additionally model the atmospheric transport of radiological releases and predict their health and economic consequences. These tools are used to perform risk studies and support probabilistic studies of severe accidents in nuclear power plants and other hazardous facilities. .

About Sandia:

Sandia National Laboratories is the nation’s premier science and engineering lab for national security and technology innovation, with teams of specialists focused on cutting-edge work in a broad array of areas. Some of the main reasons we love our jobs: + Challenging work withamazingimpact that contributes to security, peace, and freedom worldwide + Extraordinary co-workers + Some of the best tools, equipment, and research facilities in the world + Career advancement and enrichment opportunities + Flexible schedules, generous vacations,strongmedical and other benefits, competitive 401k, learning opportunities, relocation assistance and amenities aimed at creating a solid work/life balance* _World-changing technologies. Life-changing careers._ Learn more about Sandia at: http://www.sandia.gov *These benefits vary by job classification.

Security Clearance:

This position does not currently require a Department of Energy (DOE) security clearance. Sandia will conduct a pre-employment drug test and background review that includes checks of personal references, credit, law enforcement records, and employment/education verifications. Furthermore, employees in New Mexico must pass a U.S. Air Force background screen for access to Kirtland Air Force Base. Substance abuse or illegal drug use, falsification of information, criminal activity, serious misconduct or other indicators of untrustworthiness can cause access to be denied or terminated, resulting in the inability to perform the duties assigned and subsequent termination of employment. If hired without a clearance and it subsequently becomes necessary to obtain and maintain one for the position, or you bid on positions that require a DOE security clearance, a pre-processing background review that includes checks of personal references, credit, law enforcement records, and employment/education verifications may be conducted prior to a required federal background investigation. Applicants for a DOE security clearance must be U.S. citizens. If you hold more than one citizenship (i.e., of the U.S. and another country), your ability to obtain a security clearance may be impacted.

EEO Statement:

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status.



 

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