On the calculation of reactor iime constants using the Monte Carlo method

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

    Abstract

    Full-core reactor dynamics calculation involves the coupled modelling of thermal hydraulics and the time-dependent behaviour of core neutronics. The reactor time constants include prompt neutron lifetimes, neutron reproduction times, effective delayed neutron fractions and the corresponding decay constants, typically divided into six or eight precursor groups. The calculation of these parameters is traditionally carried out using deterministic lattice transport codes, which also produce the homogenised few-group constants needed for resolving the spatial dependence of neutron flux. In recent years, there has been a growing interest in the production of simulator input parameters using the stochastic Monte Carlo method, which has several advantages over deterministic transport calculation. This paper reviews the methodology used for the calculation of reactor time constants. The calculation techniques are put to practice using two codes, the PSG continuous-energy Monte Carlo reactor physics code and MORA, a new full-core Monte Carlo neutron transport code entirely based on homogenisation. Both codes are being developed at the VTT Technical Research Centre of Finland. The results are compared to other codes and experimental reference data in the CROCUS reactor kinetics benchmark calculation.
    Original languageEnglish
    Title of host publicationProceedings of the International Youth Nuclear Congress 2008
    Number of pages10
    Publication statusPublished - 2008
    MoE publication typeA4 Article in a conference publication
    EventInternational Youth Nuclear Congress, IYNC 2008 - Interlaken, Switzerland
    Duration: 20 Sep 200826 Sep 2008

    Conference

    ConferenceInternational Youth Nuclear Congress, IYNC 2008
    Abbreviated titleIYNC 2008
    CountrySwitzerland
    CityInterlaken
    Period20/09/0826/09/08

    Fingerprint

    Monte Carlo method
    reactors
    neutrons
    time constant
    reactor physics
    reactor cores
    Finland
    homogenizing
    flux (rate)
    hydraulics
    simulators
    methodology
    life (durability)
    kinetics
    decay
    energy

    Cite this

    Leppänen, J. (2008). On the calculation of reactor iime constants using the Monte Carlo method. In Proceedings of the International Youth Nuclear Congress 2008 [116]
    Leppänen, Jaakko. / On the calculation of reactor iime constants using the Monte Carlo method. Proceedings of the International Youth Nuclear Congress 2008. 2008.
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    title = "On the calculation of reactor iime constants using the Monte Carlo method",
    abstract = "Full-core reactor dynamics calculation involves the coupled modelling of thermal hydraulics and the time-dependent behaviour of core neutronics. The reactor time constants include prompt neutron lifetimes, neutron reproduction times, effective delayed neutron fractions and the corresponding decay constants, typically divided into six or eight precursor groups. The calculation of these parameters is traditionally carried out using deterministic lattice transport codes, which also produce the homogenised few-group constants needed for resolving the spatial dependence of neutron flux. In recent years, there has been a growing interest in the production of simulator input parameters using the stochastic Monte Carlo method, which has several advantages over deterministic transport calculation. This paper reviews the methodology used for the calculation of reactor time constants. The calculation techniques are put to practice using two codes, the PSG continuous-energy Monte Carlo reactor physics code and MORA, a new full-core Monte Carlo neutron transport code entirely based on homogenisation. Both codes are being developed at the VTT Technical Research Centre of Finland. The results are compared to other codes and experimental reference data in the CROCUS reactor kinetics benchmark calculation.",
    author = "Jaakko Lepp{\"a}nen",
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    Leppänen, J 2008, On the calculation of reactor iime constants using the Monte Carlo method. in Proceedings of the International Youth Nuclear Congress 2008., 116, International Youth Nuclear Congress, IYNC 2008, Interlaken, Switzerland, 20/09/08.

    On the calculation of reactor iime constants using the Monte Carlo method. / Leppänen, Jaakko.

    Proceedings of the International Youth Nuclear Congress 2008. 2008. 116.

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

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    AB - Full-core reactor dynamics calculation involves the coupled modelling of thermal hydraulics and the time-dependent behaviour of core neutronics. The reactor time constants include prompt neutron lifetimes, neutron reproduction times, effective delayed neutron fractions and the corresponding decay constants, typically divided into six or eight precursor groups. The calculation of these parameters is traditionally carried out using deterministic lattice transport codes, which also produce the homogenised few-group constants needed for resolving the spatial dependence of neutron flux. In recent years, there has been a growing interest in the production of simulator input parameters using the stochastic Monte Carlo method, which has several advantages over deterministic transport calculation. This paper reviews the methodology used for the calculation of reactor time constants. The calculation techniques are put to practice using two codes, the PSG continuous-energy Monte Carlo reactor physics code and MORA, a new full-core Monte Carlo neutron transport code entirely based on homogenisation. Both codes are being developed at the VTT Technical Research Centre of Finland. The results are compared to other codes and experimental reference data in the CROCUS reactor kinetics benchmark calculation.

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    Leppänen J. On the calculation of reactor iime constants using the Monte Carlo method. In Proceedings of the International Youth Nuclear Congress 2008. 2008. 116