Home >> Distinctive Signature: ICIS

High Temperature Test Laboratory

High Temperature Test Laboratory (HTTL) staff collectively holds several decades of experience in high temperature testing and specialized sensor development. These engineers and scientists have participated in notable large-scale research programs, such as INL’s Loss-of-Fluid Test, Semiscale, and Power Burst Facility efforts and the Organization for Economic Cooperation and Development’s (OECDs) Three Mile Island Unit-2 Vessel Investigation Program (TMI-2 VIP). In addition, staff actively participate in collaborations with key universities and foreign research organizations.  


    Ben Chase, B.S.

    Ben Chase joined INL in 2008 as a Reactor Engineer at the Advanced Test Reactor.  He joined the HTTL team in 2010 to assist with neutron detector testing in the Advanced Test Reactor Critical Facility (ATRC).  He has facilitated the development, fabrication, and installation of new test hardware for experiments in the ATRC.  He has also been involved in projects to perform reactor dosimetry tests for ATRC model validation and neutron spectrum characterization.

    Keith Condie, M.S.

    Keith Condie has more than 35 years of experience in experimental test programs. He was a key technical contributor to several INL programs, including the Loss of Fluid Test facility, Semiscale, Savannah River Restart programs, the INL Matched Index-of-Refraction experimental research loop, and a Prototypic Materials Test Program funded by Japan's Nuclear Power Engineering Corporation.

    Kurt Davis, B.S.

    Kurt Davis has more than 20 years experience. Recent work includes the development of micro-CT techniques for the X-ray scanning of solid rocket fuel and high temperature investigations of materials for use in irradiation testing. He is a co-author for the computer codes SCDAP/RELAP5/MOD3.1 and FRAPCON-3 which are used to perform best-estimate safety calculations to describe overall reactor coolant system thermal-hydraulic response, core damage progression during severe accidents, and fuel rod behavior.

    Joshua Daw, M.S.

    Josh Daw is a researcher at INL where he works on in-pile instrumentation development efforts for INL's Advanced Test Reactor National Scientific User Facility and conducts high-temperature thermal property testing.  As a University of Idaho graduate student, he was recognized for outstanding research in high-temperature in-pile instrumentation.  Josh has also worked at the Norwegian Halden Reactor Project as a visiting researcher.  He has authored or co-authored 12 peer reviewed journal publications and 13 peer-reviewed conference papers on high temperature testing and in-pile instrumentation.

    Darrell Knudson, M.S.

    Darrell Knudson has more than 30 years of experience in nuclear reactor safety analysis, fuel performance modeling, computer code development, and high-temperature instrumentation design, fabrication, and testing.  He is currently leading HTTL efforts to develop the capability for in-core measurement of elongation using linear variable displacement transducers and ultrasonic techniques.

    David Nigg, Ph.D.

    Dr. David Nigg has over 30 years of experience in computational and experimental reactor and radiation physics, research reactor applications, medical applications of nuclear and radiological sciences, radiobiology and radiation biophysics, and technical management.  Dr. Nigg is a registered Professional Engineer by Examination in the State of Idaho.  In 2006, he received the Hatanaka Memorial Award, the highest honor bestowed by the International Society for Neutron Capture Therapy (ISNCT) in recognition of sustained excellence and leadership in NCT research and development.  Dr. Nigg currently leads the INL ATR Modeling, Simulation, and V&V Upgrade initiative.

    Joy Rempe, Ph.D.

    Dr. Joy Rempe is a Laboratory Fellow and Group Leader at the INL where she leads in-pile instrumentation development efforts for INL's Advanced Test Reactor National Scientific User Facility. She also serves as a member of several advisory groups reviewing the U.S. Department of Energy's Office of Nuclear Energy Research and Development programs; and she provides consulting assistance to vendors, utilities, and regulators on severe accident issues. With over 25 years of research experience, Dr. Rempe has authored or co-authored 50 archival peer-reviewed journal publications and 90 peer-reviewed conference papers on reactor safety, severe accident phenomena, high temperature testing, and in-pile instrumentation. She is an inventor/co-inventor on two patents with one patent pending. In 2005, Dr. Rempe was elected a Fellow in the American Nuclear Society. In 2009, she was elected to the ANS Board of Directors; in 2010, she was selected to serve on the U. S. Nuclear Regulatory Commission's Advisory Committee on Reactor Safeguards; and in 2011, she received the U.S. Department of Energy Secretarial Honors Award.

    Troy Unruh

    Troy Unruh has over eight years of experience with reactor operations and experiments.  He is currently the ATR Reactor Project Engineer that leads ATR NSUF flux evaluation activities.  Mr. Unruh earned an R&D 100 award for research he completed on semiconductor neutron detection at Kansas State University, and he has authored several archival peer-reviewed journal publications and peer-reviewed conference papers.


    • Mr. S. Curtis Wilkins, Consultant
    • Professor Bernhard R. Tittmann, Pennsylvania State University
    • Professor Heng Ban, Utah State University
    • Professor John Crepeau, University of Idaho


    • Idaho State University
    • Kansas State University
    • Massachusetts Institute of Technology
    • Pennsylvania State University
    • Seoul National University
    • University of Idaho
    • Utah State University

    Research Organizations

    • French Commissariat a l'Energie Atomique (CEA)
    • Korea Atomic Energy Research Institute (KAERI)
    • Norwegian Institute for Energy Technology at the Halden Reactor Project (IFE/HRP)

    Page Contact Information:

    Department of energy

    DOE Office of Nuclear Energy
    DOE-Idaho Office