Coupled neutronics and thermal hydraulics modelling in reactor dynamics codes TRAB-3d and hextran

Riitta Kyrki-Rajamäki, Hanna Räty

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

    Abstract

    The reactor dynamics codes for transient and accident analyses inherently include the coupling of neutronics and thermal hydraulics modelling. In Finland a number of codes with 1D and 3D neutronic models have been developed, which include models also for the cooling circuits. They have been used mainly for the needs of Finnish power plants, but some of the codes have also been utilized elsewhere. The continuous validation, simultaneous development, and experiences obtained in commercial applications have considerably improved the performance and range of application of the codes. The fast operation of the codes has enabled realistic analysis of 3D core combined to a full model of the cooling circuit even in such long reactivity scenarios as ATWS. The reactor dynamics methods are developed further and new more detailed models are created for tasks related to increased safety requirements. For thermal hydraulics calculations, an accurate general flow model based on a new solution method has been developed. Although mainly intended for analysis purposes, the reactor dynamics codes also provide reference solutions for simulator applications. As computer capability increases, these more sophisticated methods can be taken into use also in simulator environments.
    Original languageEnglish
    Title of host publicationProceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages292-305
    ISBN (Print)951-38-5269-5
    Publication statusPublished - 1999
    MoE publication typeA4 Article in a conference publication
    Event2nd CSNI Specialist Meeting on Simulators and Plant Analysers - Espoo, Finland
    Duration: 29 Sep 19972 Oct 1997

    Publication series

    SeriesVTT Symposium
    Number194
    ISSN0357-9387

    Conference

    Conference2nd CSNI Specialist Meeting on Simulators and Plant Analysers
    CountryFinland
    CityEspoo
    Period29/09/972/10/97

    Fingerprint

    Hydraulics
    Simulators
    Cooling
    Networks (circuits)
    Accidents
    Power plants
    Hot Temperature

    Cite this

    Kyrki-Rajamäki, R., & Räty, H. (1999). Coupled neutronics and thermal hydraulics modelling in reactor dynamics codes TRAB-3d and hextran. In Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers (pp. 292-305). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 194
    Kyrki-Rajamäki, Riitta ; Räty, Hanna. / Coupled neutronics and thermal hydraulics modelling in reactor dynamics codes TRAB-3d and hextran. Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers. Espoo : VTT Technical Research Centre of Finland, 1999. pp. 292-305 (VTT Symposium; No. 194).
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    abstract = "The reactor dynamics codes for transient and accident analyses inherently include the coupling of neutronics and thermal hydraulics modelling. In Finland a number of codes with 1D and 3D neutronic models have been developed, which include models also for the cooling circuits. They have been used mainly for the needs of Finnish power plants, but some of the codes have also been utilized elsewhere. The continuous validation, simultaneous development, and experiences obtained in commercial applications have considerably improved the performance and range of application of the codes. The fast operation of the codes has enabled realistic analysis of 3D core combined to a full model of the cooling circuit even in such long reactivity scenarios as ATWS. The reactor dynamics methods are developed further and new more detailed models are created for tasks related to increased safety requirements. For thermal hydraulics calculations, an accurate general flow model based on a new solution method has been developed. Although mainly intended for analysis purposes, the reactor dynamics codes also provide reference solutions for simulator applications. As computer capability increases, these more sophisticated methods can be taken into use also in simulator environments.",
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    Kyrki-Rajamäki, R & Räty, H 1999, Coupled neutronics and thermal hydraulics modelling in reactor dynamics codes TRAB-3d and hextran. in Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 194, pp. 292-305, 2nd CSNI Specialist Meeting on Simulators and Plant Analysers, Espoo, Finland, 29/09/97.

    Coupled neutronics and thermal hydraulics modelling in reactor dynamics codes TRAB-3d and hextran. / Kyrki-Rajamäki, Riitta; Räty, Hanna.

    Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers. Espoo : VTT Technical Research Centre of Finland, 1999. p. 292-305 (VTT Symposium; No. 194).

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

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    AB - The reactor dynamics codes for transient and accident analyses inherently include the coupling of neutronics and thermal hydraulics modelling. In Finland a number of codes with 1D and 3D neutronic models have been developed, which include models also for the cooling circuits. They have been used mainly for the needs of Finnish power plants, but some of the codes have also been utilized elsewhere. The continuous validation, simultaneous development, and experiences obtained in commercial applications have considerably improved the performance and range of application of the codes. The fast operation of the codes has enabled realistic analysis of 3D core combined to a full model of the cooling circuit even in such long reactivity scenarios as ATWS. The reactor dynamics methods are developed further and new more detailed models are created for tasks related to increased safety requirements. For thermal hydraulics calculations, an accurate general flow model based on a new solution method has been developed. Although mainly intended for analysis purposes, the reactor dynamics codes also provide reference solutions for simulator applications. As computer capability increases, these more sophisticated methods can be taken into use also in simulator environments.

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    Kyrki-Rajamäki R, Räty H. Coupled neutronics and thermal hydraulics modelling in reactor dynamics codes TRAB-3d and hextran. In Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers. Espoo: VTT Technical Research Centre of Finland. 1999. p. 292-305. (VTT Symposium; No. 194).