Integral Experiments Data, Databases, Benchmarks and Safety Joint Projects
CSNI2033 STEM.
last modified: 11-JUL-2018 | catalog | new | search |

CSNI2033 STEM.

STEM, Source Term Evaluation and Mitigation (STEM) Project

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1. NAME

STEM

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2. COMPUTERS
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Program name Package id Status Status date
STEM CSNI2033/01 Arrived 11-JUL-2018

Machines used:

Package ID Orig. computer Test computer
CSNI2033/01 Many Computers
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3. DESCRIPTION

Past, recent and ongoing R&D programmes (e.g. Phebus FP, ISTP, ARTIST, OECD/BIP and THAI Projects) are mainly focussed on the reduction of uncertainties on the evaluation of the potential source term to the environment in case of a light water reactor (LWR) severe accident. This effort is sustained within the EU/SARNET Network of Excellence.

 

However, it has been recognised that known phenomenological uncertainties remain for some complex phenomena with a significant impact on source term. For public acceptance of lifetime extension of existing reactors, it must be demonstrated that their safety level continues to be enhanced.

 

Therefore, a new NEA project named STEM (Source Term Evaluation and Mitigation) was initiated in 2011 to improve the general evaluation of the source term. In addition, the reduction of known phenomenological uncertainties on certain phenomena is expected to help in

•providing better information and tools to emergency teams in order to help them making a more robust diagnosis and prognosis of the progression of an accident and a better evaluation of potential release of radioactive materials;

•investigating phenomena involved in possible complementary mitigation measures, natural or engineered, so as to minimise releases to the environment.

 

The NEA STEM Project deals with three main issues:

•Radioactive iodine release in mid and long term – In complement to previous programmes, it is proposed to perform experiments to study the stability of aerosol particles under radiation and the long term gas/deposits equilibrium in a containment.

•Interactions between iodine and paints – No experiments are planned but a literature survey especially focussed on the effect of paint ageing that is likely to lead to the definition of experiments in a possible follow-up project.

•Ruthenium chemistry – In complement to previous programmes, it is proposed to perform experiments to study the Ruthenium transport in pipes.

 

Within the frame of the NEA STEM Project, the first series of experiments (iodine behaviour under radiation) are dedicated to the analysis of radiation effects and will thus be realized in benches built on the EPICUR (Experimental Programme of Iodine Chemistry Under Radiation) facility. The second series of experiments (ruthenium transport) will aim to analyse the chemistry of ruthenium in pipes including the reactor coolant system and in filters. They will be performed in dedicated benches allowing the injection of different chemical compounds followed by their transport through high temperature gradient tubes up to aerosols filters and bubblers for gas trapping

 

Participating countries: Canada, Czech Republic, Finland, France, Germany, Korea and the United States of America.

 

Project Period: July 2011 to September 2015

 

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

 

For more information see http://www.oecd-nea.org/jointproj/stem.html

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9. STATUS
Package ID Status date Status
CSNI2033/01 11-JUL-2018 Masterfiled restricted
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10. REFERENCES
CSNI2033/01, included references:
- Juliette COLOMBANI:
LD1 EPICUR test objectives, SERCI - 2011 - 126 - DR, STEM - 1
- Juliette COLOMBANI:
LD2 EPICUR test objectives, SERCI - 2011 - 188 - DR, STEM - 2
- Juliette COLOMBANI:
LD3 EPICUR test objectives, SERCI - 2011 - 246, STEM - 3
- Olivia LEROY:
EPICUR test proposal for the study of Iodine Aerosol Stability under radiation,
SERCI-2011-290 STEM No.4
- Beatrice SIMONDI-TEISSEIRE:
Description of the STEM/EPICUR program facility, SERCI-2011-310 STEM No.5
- Sylvie FILLET, Juliette COLOMBANI, Cedric GOMEZ, Cecile PASCAL, Laurent
MARTINET :
LD1, LD2, LD3 STEM/EPICUR test report - Formation and release of volatile
species from painted coupons, SEREX 2012 - 057 STEM no.6
- Marie-Noelle OHNET, Olivia LEROY :
Description of the facility used for the START program, SEREX 2012 - 136 STEM
no.7
- Marie-Noelle OHNET, Olivia LEROY :
Test proposal for the Study of the TrAnsport of RuThenium in the primary
circuit (START) , SEREX 2012 - 137 STEM no.8
- Olivia LEROY, C. GOMEZ, C. PASCAL, L. MARTINET, N. MONCHALIN:
AER 1, AER 2b, AER 3 STEM/EPICUR tests report - Formation and release of
volatile iodine species from CsI aerosols under radiation, BDD-ST SEREX
2012-225 STEM No. 9
- J. COLOMBANI:
LD4 and LD5 STEM/EPICUR test report - Formation and release of iodine volatile
species from painted coupons, BDD-ST SEREX-2012-252 STEM 10
- J. COLOMBANI:
Dose rate measurements in the irradiation vessel used during the EPICUR tests
Dose rate mapping performed before and after the reloading of the SV68
irradiator sources
SEREX-2013-00205 STEM 11 and Revision 2
- STEM 12 cancelled and replaced by STEM 18 report
- J. COLOMBANI, C. PASCAL, L. MARTINET, C. DUFFIEUX :
LD6 STEM/EPICUR test report - Formation and release of iodine volatile species
from painted coupons, SEREX-2013-00449 STEM no.13
- J. COLOMBANI, S. PLANTEUR
AER-4, AER-5 and AER-6 STEM/EPICUR test report - Formation and release of
volatile iodine species from CsI aerosols under radiation, SEREX/2013-00616
STEM 14
- J. COLOMBANI, C. PASCAL, L. MARTINET, C. DUFFIEUX :
AER-7 STEM/EPICUR test report - Formation and release of volatile iodine
species from iodine oxide aerosols under radiation, SEREX/2014-00025 STEM no.15
- J. COLOMBANI, C. PASCAL, L. MARTINET, C. DUFFIEUX, G. BOY:
AER-11 STEM/EPICUR test report - Formation and release of volatile iodine
species from CsI aerosols under radiation, SEREX/2014-00365 STEM no.16
- MN. OHNET, O. LEROY, S. PLANTEUR :
START 1 to 16 Tests report - Study of the TrAnsport of RuThenium in the primary
circuit, SEREX/2014-00371 STEM no.17
- MN. OHNET, O. LEROY:
START 1 to 5 Tests report - Study of the TrAnsport of RuThenium in the primary
circuit, SEREX/2015-00031 STEM no.18, Revision of PLEIADE Report :
SEREX/2013-00214 STEM no.12
- J. COLOMBANI, C. PASCAL, L. MARTINET, C. DUFFIEUX :
LD STEM/EPICUR tests synthesis report
Formation and release of iodine volatile species from painted coupons loaded
with I2, SEREX-2015-00096 STEM no.19
- L. BOSLAND:
Influence of paint aging on iodine interaction with Epoxy paint types and
iodine volatility, PSN-RES/SAG/2014-00426 STEM no.20
- J. COLOMBANI, C. PASCAL, L. MARTINET, C. DUFFIEUX :
AER-8, AER-9 and AER-10 STEM/EPICUR test report - Formation and release of
volatile iodine species from iodine oxide aerosols under radiation,
SEREX/2015-00206 STEM no.21
- MN. OHNET, O. LEROY:
START 17 and 18 tests report - Study of the TrAnsport of RuThenium in the RCS
with a smooth thermal profile, SEREX/2015-00212 STEM no.22
- J. COLOMBANI, C. PASCAL, L. MARTINET, C. DUFFIEUX, O. LEROY :
AER-Csl STEM/EPICUR tests synthesis report - Formation and release of iodine
volatile species from Csl aerosols under radiation, SEREX/2015-00292 STEM no.23
- J. COLOMBANI, C. PASCAL, L. MARTINET, C. DUFFIEUX :
AER-12 STEM/EPICUR test report - Formation and release of volatile iodine
species from CdI2 aerosols under radiation, SEREX/2015-00323 STEM no.24
- MN. OHNET, O. LEROY:
START 19LD and 20LD test report - Study of the TrAnsport of RuThenium in the
RCS with a Stainless Steel tube, SEREX/2015-00331 STEM no.25
- MN. OHNET, O. LEROY:
STEM program -START tests - Final Report. Study of the TrAnsport of RuThenium
in the RCS, SEREX/2015-00402 STEM no.26
- MUN C., COLOMBANI J., OHNET M.N., LEROY O. :
STEM FINAL Summary report OECD/NEA-STEM Program, SEREX/2015-00650 STEM no.27
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12. PROGRAMMING LANGUAGE(S) USED
No specified programming language
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16. MATERIAL AVAILABLE
CSNI2033/01
iodine behaviour under radiation experiments
ruthenium transport experiments
technical reports
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17. CATEGORIES
  • Y. Integral Experiments Data, Databases, Benchmarks

Keywords: LWR reactors, iodine, light-water reactors, mitigation, severe accident, source term evaluation.