Modeling of ESBWR passive containment cooling system with MELCOR

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

Abstract

Capability of the MELCOR code to model the passive containment cooling system of the GE Hitachi ESBWR reactor design was investigated. The system consists of vertical tubes immersed in a water pool. Steam from the containment flows through the tubes and condenses on their inner surfaces. Results from three test facilities were utilized in the model development. In some cases MELCOR underestimated the condensation rate significantly when using default heat transfer parameters. This problem was corrected by modifying the Reynolds number limits for classifying the condensate film flow as laminar or turbulent to values found in literature. After this modification, it is possible to achieve better than 10 % accuracy in the condensation rate. Also aerosol deposition in the condenser tubes is reproduced well. In order to avoid oscillation and excessively short time steps, careful modeling of drainage of the condensed water out of the condenser is important.
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication22nd International Conference Nuclear Energy for New Europe, NENE 2013
Place of PublicationLjubljana, Slovenia
Publication statusPublished - 2013
MoE publication typeA4 Article in a conference publication
Event22nd International Conference Nuclear Energy for New Europe, NENE 2013 - Bled, Slovenia
Duration: 9 Sep 201312 Sep 2013

Conference

Conference22nd International Conference Nuclear Energy for New Europe, NENE 2013
Abbreviated titleNENE 2013
CountrySlovenia
CityBled
Period9/09/1312/09/13

Fingerprint

Cooling systems
Condensation
Condenser tubes
Test facilities
Drainage
Aerosols
Water
Reynolds number
Steam
Heat transfer

Keywords

  • nuclear safety
  • severe accidents
  • passive containment cooling system
  • MELCOR

Cite this

Sevon, T. (2013). Modeling of ESBWR passive containment cooling system with MELCOR. In Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013 Ljubljana, Slovenia.
Sevon, Tuomo. / Modeling of ESBWR passive containment cooling system with MELCOR. Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013. Ljubljana, Slovenia, 2013.
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abstract = "Capability of the MELCOR code to model the passive containment cooling system of the GE Hitachi ESBWR reactor design was investigated. The system consists of vertical tubes immersed in a water pool. Steam from the containment flows through the tubes and condenses on their inner surfaces. Results from three test facilities were utilized in the model development. In some cases MELCOR underestimated the condensation rate significantly when using default heat transfer parameters. This problem was corrected by modifying the Reynolds number limits for classifying the condensate film flow as laminar or turbulent to values found in literature. After this modification, it is possible to achieve better than 10 {\%} accuracy in the condensation rate. Also aerosol deposition in the condenser tubes is reproduced well. In order to avoid oscillation and excessively short time steps, careful modeling of drainage of the condensed water out of the condenser is important.",
keywords = "nuclear safety, severe accidents, passive containment cooling system, MELCOR",
author = "Tuomo Sevon",
note = "Project code: 81480",
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isbn = "978-9-6162-0736-2",
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Sevon, T 2013, Modeling of ESBWR passive containment cooling system with MELCOR. in Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013. Ljubljana, Slovenia, 22nd International Conference Nuclear Energy for New Europe, NENE 2013, Bled, Slovenia, 9/09/13.

Modeling of ESBWR passive containment cooling system with MELCOR. / Sevon, Tuomo.

Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013. Ljubljana, Slovenia, 2013.

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

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N2 - Capability of the MELCOR code to model the passive containment cooling system of the GE Hitachi ESBWR reactor design was investigated. The system consists of vertical tubes immersed in a water pool. Steam from the containment flows through the tubes and condenses on their inner surfaces. Results from three test facilities were utilized in the model development. In some cases MELCOR underestimated the condensation rate significantly when using default heat transfer parameters. This problem was corrected by modifying the Reynolds number limits for classifying the condensate film flow as laminar or turbulent to values found in literature. After this modification, it is possible to achieve better than 10 % accuracy in the condensation rate. Also aerosol deposition in the condenser tubes is reproduced well. In order to avoid oscillation and excessively short time steps, careful modeling of drainage of the condensed water out of the condenser is important.

AB - Capability of the MELCOR code to model the passive containment cooling system of the GE Hitachi ESBWR reactor design was investigated. The system consists of vertical tubes immersed in a water pool. Steam from the containment flows through the tubes and condenses on their inner surfaces. Results from three test facilities were utilized in the model development. In some cases MELCOR underestimated the condensation rate significantly when using default heat transfer parameters. This problem was corrected by modifying the Reynolds number limits for classifying the condensate film flow as laminar or turbulent to values found in literature. After this modification, it is possible to achieve better than 10 % accuracy in the condensation rate. Also aerosol deposition in the condenser tubes is reproduced well. In order to avoid oscillation and excessively short time steps, careful modeling of drainage of the condensed water out of the condenser is important.

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KW - severe accidents

KW - passive containment cooling system

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Sevon T. Modeling of ESBWR passive containment cooling system with MELCOR. In Proceedings: 22nd International Conference Nuclear Energy for New Europe, NENE 2013. Ljubljana, Slovenia. 2013