The coupled code TRAB-3D-SMABRE for 3D transient and accident analyses

Jaakko Miettinen, Hanna Räty

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

1 Citation (Scopus)

Abstract

VTT's three-dimensional TRAB-3D core dynamics code and SMABRE thermal hydraulic system code have been coupled together using an internal coupling scheme in order to increase flexibility in the thermal hydraulics modelling of the core calculation. VTT's reactor dynamics codes have performed well in all the situations that they have originally been designed for. The most important limitation of the present code models is their inability to handle coolant flow reversal in the core channel, a phenomenon that can be encountered in e.g. BWR ATWS cases or VVER power excursions. The new coupling of the two codes is realized on the level of each node of each channel in the core, with each fuel bundle described with its own channel. TRAB-3D performs only the neutronics calculation, SMABRE takes care of the hydraulics calculation of the whole cooling circuit including the reactor core, while heat transfer calculation can be carried out optionally by either code. The codes have earlier been coupled using a parallel coupling scheme. Several modifications were necessary in SMABRE, concerning modelling of hydraulics, heat transfer, geometry and the matrix solution. The accuracy of the steady state calculation in the coupled code has been improved to a level suitable for both PWR and BWR calculations, as compared against the SIMULATE and reference TRAB-3D codes. Presently BWR dynamics calculations are being tested with single disturbances, such as control rod movements, pump coastdown etc. Besides allowing modelling of reversed flow in the core, the internally coupled code will make future modelling of in-core cross-flows or even 3D flow in a PWR (such as EPR) open core geometry possible, e.g. by using the porous medium approach.
Original languageEnglish
Title of host publicationSAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006
Subtitle of host publicationFinal Report
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages48-59
ISBN (Electronic)951-38-6887-7
ISBN (Print)951-38-6886-9
Publication statusPublished - 2006
MoE publication typeNot Eligible

Publication series

SeriesVTT Tiedotteita - Research Notes
Number2363
ISSN1235-0605

Fingerprint

Accidents
Hydraulics
Heat transfer
Control rods
Geometry
Reactor cores
Coolants
Paramagnetic resonance
Porous materials
Pumps
Cooling
Networks (circuits)
Hot Temperature

Cite this

Miettinen, J., & Räty, H. (2006). The coupled code TRAB-3D-SMABRE for 3D transient and accident analyses. In SAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006: Final Report (pp. 48-59). Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Research Notes, No. 2363
Miettinen, Jaakko ; Räty, Hanna. / The coupled code TRAB-3D-SMABRE for 3D transient and accident analyses. SAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006: Final Report. Espoo : VTT Technical Research Centre of Finland, 2006. pp. 48-59 (VTT Tiedotteita - Research Notes; No. 2363).
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Miettinen, J & Räty, H 2006, The coupled code TRAB-3D-SMABRE for 3D transient and accident analyses. in SAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006: Final Report. VTT Technical Research Centre of Finland, Espoo, VTT Tiedotteita - Research Notes, no. 2363, pp. 48-59.

The coupled code TRAB-3D-SMABRE for 3D transient and accident analyses. / Miettinen, Jaakko; Räty, Hanna.

SAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006: Final Report. Espoo : VTT Technical Research Centre of Finland, 2006. p. 48-59 (VTT Tiedotteita - Research Notes; No. 2363).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

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AU - Miettinen, Jaakko

AU - Räty, Hanna

PY - 2006

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N2 - VTT's three-dimensional TRAB-3D core dynamics code and SMABRE thermal hydraulic system code have been coupled together using an internal coupling scheme in order to increase flexibility in the thermal hydraulics modelling of the core calculation. VTT's reactor dynamics codes have performed well in all the situations that they have originally been designed for. The most important limitation of the present code models is their inability to handle coolant flow reversal in the core channel, a phenomenon that can be encountered in e.g. BWR ATWS cases or VVER power excursions. The new coupling of the two codes is realized on the level of each node of each channel in the core, with each fuel bundle described with its own channel. TRAB-3D performs only the neutronics calculation, SMABRE takes care of the hydraulics calculation of the whole cooling circuit including the reactor core, while heat transfer calculation can be carried out optionally by either code. The codes have earlier been coupled using a parallel coupling scheme. Several modifications were necessary in SMABRE, concerning modelling of hydraulics, heat transfer, geometry and the matrix solution. The accuracy of the steady state calculation in the coupled code has been improved to a level suitable for both PWR and BWR calculations, as compared against the SIMULATE and reference TRAB-3D codes. Presently BWR dynamics calculations are being tested with single disturbances, such as control rod movements, pump coastdown etc. Besides allowing modelling of reversed flow in the core, the internally coupled code will make future modelling of in-core cross-flows or even 3D flow in a PWR (such as EPR) open core geometry possible, e.g. by using the porous medium approach.

AB - VTT's three-dimensional TRAB-3D core dynamics code and SMABRE thermal hydraulic system code have been coupled together using an internal coupling scheme in order to increase flexibility in the thermal hydraulics modelling of the core calculation. VTT's reactor dynamics codes have performed well in all the situations that they have originally been designed for. The most important limitation of the present code models is their inability to handle coolant flow reversal in the core channel, a phenomenon that can be encountered in e.g. BWR ATWS cases or VVER power excursions. The new coupling of the two codes is realized on the level of each node of each channel in the core, with each fuel bundle described with its own channel. TRAB-3D performs only the neutronics calculation, SMABRE takes care of the hydraulics calculation of the whole cooling circuit including the reactor core, while heat transfer calculation can be carried out optionally by either code. The codes have earlier been coupled using a parallel coupling scheme. Several modifications were necessary in SMABRE, concerning modelling of hydraulics, heat transfer, geometry and the matrix solution. The accuracy of the steady state calculation in the coupled code has been improved to a level suitable for both PWR and BWR calculations, as compared against the SIMULATE and reference TRAB-3D codes. Presently BWR dynamics calculations are being tested with single disturbances, such as control rod movements, pump coastdown etc. Besides allowing modelling of reversed flow in the core, the internally coupled code will make future modelling of in-core cross-flows or even 3D flow in a PWR (such as EPR) open core geometry possible, e.g. by using the porous medium approach.

M3 - Chapter or book article

SN - 951-38-6886-9

T3 - VTT Tiedotteita - Research Notes

SP - 48

EP - 59

BT - SAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Miettinen J, Räty H. The coupled code TRAB-3D-SMABRE for 3D transient and accident analyses. In SAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006: Final Report. Espoo: VTT Technical Research Centre of Finland. 2006. p. 48-59. (VTT Tiedotteita - Research Notes; No. 2363).