Thermal-hydraulics phenomena important in modeling and simulation of liquid-fuel molten salt reactors

Stephen Bajorek, David J. Diamond, Nicholas Brown, Richard Denning

    Research output: Contribution to conferencePaper

    2 Citations (Scopus)

    Abstract

    This paper discusses liquid-fuel molten salt reactors, how they will operate under normal, transient, and accident conditions, and the results of an expert elicitation to determine the corresponding thermal-hydraulic phenomena important to understanding their behavior. Identifying these phenomena will enable the U.S. Nuclear Regulatory Commission (NRC) to develop or identify modeling functionalities and tools required to carry out confirmatory analyses that examine the validity and accuracy of an applicant's calculations and help determine the margin of safety in plant design. NRC frequently does an expert elicitation using a Phenomena Identification and Ranking Table (PIRT) to identify and evaluate the state of knowledge of important modeling phenomena. However, few details about the design of these reactors and the sequence of events during accidents are known, so the process used was considered a preliminary PIRT. A panel met to define phenomena that would need to be modeled and considered the impact/importance of each phenomenon with respect to specific figures-of-merit (FoMs) (e.g., salt temperature, velocity, and composition). Each FoM reflected a potential impact on radionuclide release or loss of a barrier to release. The panel considered what the path forward might be with respect to being able to model the phenomenon in a simulation code. Results are explained for both thermal and fast spectrum designs.

    Original languageEnglish (US)
    Pages291-303
    Number of pages13
    StatePublished - Jan 1 2018
    EventInternational Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting - Orlando, United States
    Duration: Nov 11 2018Nov 15 2018

    Other

    OtherInternational Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting
    CountryUnited States
    CityOrlando
    Period11/11/1811/15/18

    Fingerprint

    hydraulic phenomena
    liquid fuels
    ranking
    molten salts
    Liquid fuels
    accidents
    hydraulics
    reactors
    plant design
    Hydraulics
    salt
    liquid
    accident
    Accidents
    figure of merit
    radioactive isotopes
    modeling
    simulation
    margins
    safety

    All Science Journal Classification (ASJC) codes

    • Geotechnical Engineering and Engineering Geology
    • Nuclear Energy and Engineering
    • Nuclear and High Energy Physics

    Cite this

    Bajorek, S., Diamond, D. J., Brown, N., & Denning, R. (2018). Thermal-hydraulics phenomena important in modeling and simulation of liquid-fuel molten salt reactors. 291-303. Paper presented at International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting, Orlando, United States.
    Bajorek, Stephen ; Diamond, David J. ; Brown, Nicholas ; Denning, Richard. / Thermal-hydraulics phenomena important in modeling and simulation of liquid-fuel molten salt reactors. Paper presented at International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting, Orlando, United States.13 p.
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    abstract = "This paper discusses liquid-fuel molten salt reactors, how they will operate under normal, transient, and accident conditions, and the results of an expert elicitation to determine the corresponding thermal-hydraulic phenomena important to understanding their behavior. Identifying these phenomena will enable the U.S. Nuclear Regulatory Commission (NRC) to develop or identify modeling functionalities and tools required to carry out confirmatory analyses that examine the validity and accuracy of an applicant's calculations and help determine the margin of safety in plant design. NRC frequently does an expert elicitation using a Phenomena Identification and Ranking Table (PIRT) to identify and evaluate the state of knowledge of important modeling phenomena. However, few details about the design of these reactors and the sequence of events during accidents are known, so the process used was considered a preliminary PIRT. A panel met to define phenomena that would need to be modeled and considered the impact/importance of each phenomenon with respect to specific figures-of-merit (FoMs) (e.g., salt temperature, velocity, and composition). Each FoM reflected a potential impact on radionuclide release or loss of a barrier to release. The panel considered what the path forward might be with respect to being able to model the phenomenon in a simulation code. Results are explained for both thermal and fast spectrum designs.",
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    Bajorek, S, Diamond, DJ, Brown, N & Denning, R 2018, 'Thermal-hydraulics phenomena important in modeling and simulation of liquid-fuel molten salt reactors' Paper presented at International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting, Orlando, United States, 11/11/18 - 11/15/18, pp. 291-303.

    Thermal-hydraulics phenomena important in modeling and simulation of liquid-fuel molten salt reactors. / Bajorek, Stephen; Diamond, David J.; Brown, Nicholas; Denning, Richard.

    2018. 291-303 Paper presented at International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting, Orlando, United States.

    Research output: Contribution to conferencePaper

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    Bajorek S, Diamond DJ, Brown N, Denning R. Thermal-hydraulics phenomena important in modeling and simulation of liquid-fuel molten salt reactors. 2018. Paper presented at International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting, Orlando, United States.