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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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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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).