Evaluation of two-fluid and drift flux thermohydraulics in APROS code environment

Jaakko Miettinen, Ismo Karppinen, Markku Hänninen, Jukka Ylijoki

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

Abstract

The characteristics of the thermohydraulic solutions in APROS are considered for the nuclear power plant modelling. The thermohydraulic model of the APROS plant analyzer includes three levels of solutions, homogeneous 3-equation model, 5-equation drift flux model and 6-equation two-fluid model. In practical modelling of versatile process systems different approaches are selected for different types of the power plant sections. The 3-equation model is used for turbines and auxiliary systems. The 5-equation model and 6-equation model are alternative models for main process sections of the primary and secondary sides. The 5-equation model has been typically selected for the real time applications and the 6-equation model for the safety analysis applications. The validation needs for both approaches are the same. Because the change of the solution mode is an easy task in APROS, the validation tasks are typically performed in parallel for 5-equation and 6-equation models. By calculating in parallel with both models systematic errors in solutions may be pointed out. The testing against both separate effects tests and integral tests is an essential part in the thermohydraulics. In different plant applications different physical features are important. The analysis requirements vary from one application to another. When nodalizations together with increased computer speed are growing up, the earlier validation cases may be insufficient. That is why the content of the code has to be known in detail. Such an expertise in the code development has to be gained that properties of the code against other thermohydraulics codes are known.
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
Pages378-389
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

Fluxes
Fluids
Systematic errors
Nuclear power plants
Power plants
Turbines
Testing

Cite this

Miettinen, J., Karppinen, I., Hänninen, M., & Ylijoki, J. (1999). Evaluation of two-fluid and drift flux thermohydraulics in APROS code environment. In Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers (pp. 378-389). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 194
Miettinen, Jaakko ; Karppinen, Ismo ; Hänninen, Markku ; Ylijoki, Jukka. / Evaluation of two-fluid and drift flux thermohydraulics in APROS code environment. Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers. Espoo : VTT Technical Research Centre of Finland, 1999. pp. 378-389 (VTT Symposium; No. 194).
@inproceedings{3ca213ef41f248cdb07686175e70b94a,
title = "Evaluation of two-fluid and drift flux thermohydraulics in APROS code environment",
abstract = "The characteristics of the thermohydraulic solutions in APROS are considered for the nuclear power plant modelling. The thermohydraulic model of the APROS plant analyzer includes three levels of solutions, homogeneous 3-equation model, 5-equation drift flux model and 6-equation two-fluid model. In practical modelling of versatile process systems different approaches are selected for different types of the power plant sections. The 3-equation model is used for turbines and auxiliary systems. The 5-equation model and 6-equation model are alternative models for main process sections of the primary and secondary sides. The 5-equation model has been typically selected for the real time applications and the 6-equation model for the safety analysis applications. The validation needs for both approaches are the same. Because the change of the solution mode is an easy task in APROS, the validation tasks are typically performed in parallel for 5-equation and 6-equation models. By calculating in parallel with both models systematic errors in solutions may be pointed out. The testing against both separate effects tests and integral tests is an essential part in the thermohydraulics. In different plant applications different physical features are important. The analysis requirements vary from one application to another. When nodalizations together with increased computer speed are growing up, the earlier validation cases may be insufficient. That is why the content of the code has to be known in detail. Such an expertise in the code development has to be gained that properties of the code against other thermohydraulics codes are known.",
author = "Jaakko Miettinen and Ismo Karppinen and Markku H{\"a}nninen and Jukka Ylijoki",
year = "1999",
language = "English",
isbn = "951-38-5269-5",
series = "VTT Symposium",
publisher = "VTT Technical Research Centre of Finland",
number = "194",
pages = "378--389",
booktitle = "Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers",
address = "Finland",

}

Miettinen, J, Karppinen, I, Hänninen, M & Ylijoki, J 1999, Evaluation of two-fluid and drift flux thermohydraulics in APROS code environment. 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. 378-389, 2nd CSNI Specialist Meeting on Simulators and Plant Analysers, Espoo, Finland, 29/09/97.

Evaluation of two-fluid and drift flux thermohydraulics in APROS code environment. / Miettinen, Jaakko; Karppinen, Ismo; Hänninen, Markku; Ylijoki, Jukka.

Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers. Espoo : VTT Technical Research Centre of Finland, 1999. p. 378-389 (VTT Symposium; No. 194).

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

TY - GEN

T1 - Evaluation of two-fluid and drift flux thermohydraulics in APROS code environment

AU - Miettinen, Jaakko

AU - Karppinen, Ismo

AU - Hänninen, Markku

AU - Ylijoki, Jukka

PY - 1999

Y1 - 1999

N2 - The characteristics of the thermohydraulic solutions in APROS are considered for the nuclear power plant modelling. The thermohydraulic model of the APROS plant analyzer includes three levels of solutions, homogeneous 3-equation model, 5-equation drift flux model and 6-equation two-fluid model. In practical modelling of versatile process systems different approaches are selected for different types of the power plant sections. The 3-equation model is used for turbines and auxiliary systems. The 5-equation model and 6-equation model are alternative models for main process sections of the primary and secondary sides. The 5-equation model has been typically selected for the real time applications and the 6-equation model for the safety analysis applications. The validation needs for both approaches are the same. Because the change of the solution mode is an easy task in APROS, the validation tasks are typically performed in parallel for 5-equation and 6-equation models. By calculating in parallel with both models systematic errors in solutions may be pointed out. The testing against both separate effects tests and integral tests is an essential part in the thermohydraulics. In different plant applications different physical features are important. The analysis requirements vary from one application to another. When nodalizations together with increased computer speed are growing up, the earlier validation cases may be insufficient. That is why the content of the code has to be known in detail. Such an expertise in the code development has to be gained that properties of the code against other thermohydraulics codes are known.

AB - The characteristics of the thermohydraulic solutions in APROS are considered for the nuclear power plant modelling. The thermohydraulic model of the APROS plant analyzer includes three levels of solutions, homogeneous 3-equation model, 5-equation drift flux model and 6-equation two-fluid model. In practical modelling of versatile process systems different approaches are selected for different types of the power plant sections. The 3-equation model is used for turbines and auxiliary systems. The 5-equation model and 6-equation model are alternative models for main process sections of the primary and secondary sides. The 5-equation model has been typically selected for the real time applications and the 6-equation model for the safety analysis applications. The validation needs for both approaches are the same. Because the change of the solution mode is an easy task in APROS, the validation tasks are typically performed in parallel for 5-equation and 6-equation models. By calculating in parallel with both models systematic errors in solutions may be pointed out. The testing against both separate effects tests and integral tests is an essential part in the thermohydraulics. In different plant applications different physical features are important. The analysis requirements vary from one application to another. When nodalizations together with increased computer speed are growing up, the earlier validation cases may be insufficient. That is why the content of the code has to be known in detail. Such an expertise in the code development has to be gained that properties of the code against other thermohydraulics codes are known.

M3 - Conference article in proceedings

SN - 951-38-5269-5

T3 - VTT Symposium

SP - 378

EP - 389

BT - Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Miettinen J, Karppinen I, Hänninen M, Ylijoki J. Evaluation of two-fluid and drift flux thermohydraulics in APROS code environment. In Proceedings of the 2nd CSNI Specialist Meeting on Simulators and Plant Analysers. Espoo: VTT Technical Research Centre of Finland. 1999. p. 378-389. (VTT Symposium; No. 194).