Modeling of ESBWR passive containment cooling system with MELCOR

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Capability of the MELCOR code to model the passive containment cooling system of the GE Hitachi ESBWR reactor design was investigated. The system consists of vertical tubes immersed in a water pool. Steam from the containment flows through the tubes and condenses on their inner surfaces. Results from three test facilities were utilized in the model development. In some cases MELCOR underestimated the condensation rate significantly when using default heat transfer parameters. This problem was corrected by modifying the Reynolds number limits for classifying the condensate film flow as laminar or turbulent to values found in literature. After this modification, it is possible to achieve better than 10 % accuracy in the condensation rate. Also aerosol deposition in the condenser tubes is reproduced well. In order to avoid oscillation and excessively short time steps, careful modeling of drainage of the condensed water out of the condenser is important.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publication22nd International Conference Nuclear Energy for New Europe, NENE 2013
    Place of PublicationLjubljana, Slovenia
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    Event22nd International Conference Nuclear Energy for New Europe, NENE 2013 - Bled, Slovenia
    Duration: 9 Sep 201312 Sep 2013

    Conference

    Conference22nd International Conference Nuclear Energy for New Europe, NENE 2013
    Abbreviated titleNENE 2013
    CountrySlovenia
    CityBled
    Period9/09/1312/09/13

    Fingerprint

    Cooling systems
    Condensation
    Condenser tubes
    Test facilities
    Drainage
    Aerosols
    Water
    Reynolds number
    Steam
    Heat transfer

    Keywords

    • nuclear safety
    • severe accidents
    • passive containment cooling system
    • MELCOR

    Cite this

    Sevon, T. (2013). Modeling of ESBWR passive containment cooling system with MELCOR. In Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013 Ljubljana, Slovenia.
    Sevon, Tuomo. / Modeling of ESBWR passive containment cooling system with MELCOR. Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013. Ljubljana, Slovenia, 2013.
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    title = "Modeling of ESBWR passive containment cooling system with MELCOR",
    abstract = "Capability of the MELCOR code to model the passive containment cooling system of the GE Hitachi ESBWR reactor design was investigated. The system consists of vertical tubes immersed in a water pool. Steam from the containment flows through the tubes and condenses on their inner surfaces. Results from three test facilities were utilized in the model development. In some cases MELCOR underestimated the condensation rate significantly when using default heat transfer parameters. This problem was corrected by modifying the Reynolds number limits for classifying the condensate film flow as laminar or turbulent to values found in literature. After this modification, it is possible to achieve better than 10 {\%} accuracy in the condensation rate. Also aerosol deposition in the condenser tubes is reproduced well. In order to avoid oscillation and excessively short time steps, careful modeling of drainage of the condensed water out of the condenser is important.",
    keywords = "nuclear safety, severe accidents, passive containment cooling system, MELCOR",
    author = "Tuomo Sevon",
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    year = "2013",
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    Sevon, T 2013, Modeling of ESBWR passive containment cooling system with MELCOR. in Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013. Ljubljana, Slovenia, 22nd International Conference Nuclear Energy for New Europe, NENE 2013, Bled, Slovenia, 9/09/13.

    Modeling of ESBWR passive containment cooling system with MELCOR. / Sevon, Tuomo.

    Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013. Ljubljana, Slovenia, 2013.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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    N2 - Capability of the MELCOR code to model the passive containment cooling system of the GE Hitachi ESBWR reactor design was investigated. The system consists of vertical tubes immersed in a water pool. Steam from the containment flows through the tubes and condenses on their inner surfaces. Results from three test facilities were utilized in the model development. In some cases MELCOR underestimated the condensation rate significantly when using default heat transfer parameters. This problem was corrected by modifying the Reynolds number limits for classifying the condensate film flow as laminar or turbulent to values found in literature. After this modification, it is possible to achieve better than 10 % accuracy in the condensation rate. Also aerosol deposition in the condenser tubes is reproduced well. In order to avoid oscillation and excessively short time steps, careful modeling of drainage of the condensed water out of the condenser is important.

    AB - Capability of the MELCOR code to model the passive containment cooling system of the GE Hitachi ESBWR reactor design was investigated. The system consists of vertical tubes immersed in a water pool. Steam from the containment flows through the tubes and condenses on their inner surfaces. Results from three test facilities were utilized in the model development. In some cases MELCOR underestimated the condensation rate significantly when using default heat transfer parameters. This problem was corrected by modifying the Reynolds number limits for classifying the condensate film flow as laminar or turbulent to values found in literature. After this modification, it is possible to achieve better than 10 % accuracy in the condensation rate. Also aerosol deposition in the condenser tubes is reproduced well. In order to avoid oscillation and excessively short time steps, careful modeling of drainage of the condensed water out of the condenser is important.

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    Sevon T. Modeling of ESBWR passive containment cooling system with MELCOR. In Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013. Ljubljana, Slovenia. 2013