Integral Experiments Data, Databases, Benchmarks and Safety Joint Projects
CSNI2031 THAI-2.
last modified: 20-FEB-2018 | catalog | new | search |

CSNI2031 THAI-2.

THAI-2, Thermal-hydraulics, Hydrogen, Aerosols, Iodine (ThAI) Project.

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1. NAME OR DESIGNATION OF PROGRAM

THAI-2.

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2. COMPUTERS
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Program name Package id Status Status date
THAI-2 CSNI2031/01 Arrived 20-FEB-2018

Machines used:

Package ID Orig. computer Test computer
CSNI2031/01 Many Computers
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The NEA THAI Project was conducted between January 2007 and December 2009. 70 experiments were performed in the THAI facility in Frankfurt, the name of which is an acronym for thermal-hydraulics, hydrogen, aerosols and iodine. Within the NEA THAI project, the following test series had been performed:

  • helium/hydrogen material scaling (HM);

  • hydrogen deflagration (HD);

  • hydrogen recombiner (HR);

  • interaction of metal iodines with passive autocatalytic recombiner;

  • passive autocatalytic recombiner poisoning;

  • aerosol wash-down (scoping test).

 

A concluding seminar on the main outcome of the THAI Project was organised on 6-7 October 2010.

 

The objective of the THAI-2 follow-up project was to address remaining questions and to provide specific water-cooled reactors, aerosol and iodine issues, and hydrogen mitigation under accidental conditions. The project addressed open questions concerning the behaviour of a) release of gaseous iodine from a flashing jet, iodine deposition on aerosol particles; b) hydrogen combustion during spray operation and passive autocatalytic recombiner operation in case of extremely low-oxygen content. The understanding of the respective processes is essential for evaluating the amount of airborne radioactivity during accidents with core damage (iodine and aerosols) and for containment integrity (hydrogen). The programme generated valuable data for these. Concerning fission products, the programme will focus on iodine release from a flashing jet and gaseous iodine deposition on aerosols. Regarding hydrogen mitigation, the programme will focus on its combustion during spray operation and on its effective removal by means of passive autocatalytic recombiners when approaching oxygen starvation. An analytical effort will accompany the experimental programme, mainly consisting of code calculations for pre-test assessments, result evaluations and extrapolation to reactor situations.

 

By means of experiments in the THAI facility, safety-relevant improvements on the issues referred to in the proposed experimental programme were achieved by the following:

  • release of gaseous iodine from a flashing jet;

  • deposition of molecular iodine on aerosol particles;

  • hydrogen combustion during spray operation;

  • onset of PAR operation in case of extremely low oxygen content.

 

Project participants: Canada, Czech Republic, Finland, France, Germany, Hungary, Japan, Korea, the Netherlands, Sweden and the United Kingdom.

 

Project Period: August 2011 to July 2014.

 

The distribution of this package is restricted and subject to prior approval.

 

For detailed information, please visit http://www.oecd-nea.org/jointproj/thai2.html

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9. STATUS
Package ID Status date Status
CSNI2031/01 20-FEB-2018 Masterfiled restricted
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10. REFERENCES
CSNI2031/01, included references:
- S. Gupta, G. Poss, M. Freitag, E. Schmidt, M. Colombet, B. von Laufenberg, A.
Kuehnel, G. Langer, F. Funke, G. Langrock, G. Weber, M. Sonnenkalb:
Aerosol and Iodine Issues and Hydrogen Mitigation under Accidental Conditions
in Water Cooled Reactors (Restricted Version), Report No. 1501420-FR-1 (May
2015)
- S. Gupta, G. Langer, M. Freitag, M. Colombet, E. Schmidt, B. von Laufenberg:
Hydrogen combustion during spray operation; Tests HD-30 to HD-35, OECD-NEA
THAI-2 Project, Report No. 1501420?TR-HD-30-35 (September 2014)
- S. Gupta, G. Langer:
Onset of PAR operation in case of low oxygen concentration, OECD-NEA
THAI-2 Project, Report No. 1501420?TR-HR-33-35 (June 2014)
- S. Gupta, E. Schmidt, G. Langer:
Effect of reduced oxygen content in air on ignition potential of Passive
Autocatalytic Recombiners (PAR) - Tests HR-36 and HR-37, OECD-NEA THAI-2
Project, Report No. 1501420?TR-HR-36-37 (June 2014)
- S. Gupta, E. Schmidt:
Onset of PAR operation in case of low oxygen concentration (Tests with NIS PAR:
HR-38, HR-39), Report No. 1501420-TR-HR38-39 (December 2014)
- S. Gupta, E. Schmidt, G. Langer:
PAR performance tests Tests with NIS PAR HR-40, HR-41, HR-42
Report No. 1501420-TR-HR-40-42 (July 2014)
- Gert Langrock:
Laboratory-scale tests on the interaction of gaseous I2 with aerosol particles
TR PTCC-G/2012/en/0315 (December 2012)
- F.Funke, S. Gupta, B. Balewski, G. Weber:
Deposition of molecular iodine on aerosol particles Iod-25 (Test using
non-reactive aerosol SnO2), Report No. 150 1420?Iod-25-TR (July 2012)
- S. Gupta, B. Balewski, A. Kuehnel, F.Funke, P. Zeh, C. Burchardt, A. Stahl:
Quick Look Report - Deposition of molecular iodine on aerosol particles
Iod-25 (Test using non-reactive aerosol SnO2), Report No. 150 1420?Iod-25-QLR
(January 2012)
- F.Funke, G. Langrock, T. Dorsch, S. Gupta, B. Von Laufenberg, A. Kuehnel,
G. Weber:
Deposition of molecular iodine on aerosol particles Iod-26 (Test using reactive
aerosol Ag), Report No.: 150 1420?Iod-26-FR (November 2013)
- S. Gupta, B. Balewski, A. Kuehnel, F.Funke, G. Langrock:
Quick look Report - Deposition of molecular iodine on aerosol particles
Iod-26 (Test using reactive aerosol Ag), Report No. 150 1420?Iod-26-QLR
(February 2013)
- F. Funke, G. Langrock, S. Gupta, B. von Laufenberg, E. Schmidt,
M. Freitag, A. Kuehnel:
Iodine release from a flashing jet (Test ID: Iod-29), Report No.: 150
1420?Iod-29-TR (June 2014)
- S. Gupta, B. von Laufenberg, E. Schmidt, M. Freitag, F. Funke, G. Langrock:
Quick look Report Iodine release from a flashing jet (Test ID: Iod-29), Report
No. 150 1420?Iod-29-QLR (April 2014)
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12. PROGRAMMING LANGUAGE(S) USED
No specified programming language
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16. MATERIAL AVAILABLE
CSNI2031/01
test series:
Hydrogen Deflagration Tests with Spray (HD)
Hydrogen Passive Autocatalytic Recombiner Tests (HR)
Interaction of Molecular Iodine with Aerosols
Release of gaseous Iodine from a flashing jet
Laboratory scale experiments on the Interaction of Iodine and Aerosols
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17. CATEGORIES
  • Y. Integral Experiments Data, Databases, Benchmarks

Keywords: aerosols, containment, fission products, hydrogen, iodine, severe accident, thermal hydraulics.