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Research Works on Iodine and Ruthenium Behavior in Severe Accident Conditions

[+] Author and Article Information
Laurent Cantrel

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: laurent.cantrel@irsn.fr

Thierry Albiol

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: thierry.albiol@irsn.fr

Loïc Bosland

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: loic.bosland@irsn.fr

Juliette Colombani

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: juliette.colombani@irsn.fr

Frédéric Cousin

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: frederic.cousin@irsn.fr

Anne-Cécile Grégoire

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: anne-cecile.gregoire@irsn.fr

Olivia Leroy

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: olivia.leroy@irsn.fr

Sandrine Morin

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: sandrine.morin@irsn.fr

Christian Mun

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: christian.mun@irsn.fr

Marie-Noëlle Ohnet

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: marie-noelle.ohnet@irsn.fr

Sidi Souvi

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Cadarache,
Saint-Paul lez Durance 13115, France
e-mail: sidi.souvi@irsn.fr

Céline Monsanglant-Louvet

Institut de Radioprotection et de Sûreté Nucléaire
(IRSN),
PNS-RES,
Saclay 91192, Gif-sur-Yvette, France
e-mail: celine.monsanglant-louvet@irsn.fr

Florent Louis

PC2A,
PhysicoChimie des Processus de Combustion et
de l'Atmosphère,
University of Lille,
UMR 8552, CNRS,
Lille 59000, France
e-mail: florent.louis@univ-lille1.fr

Bruno Azambre

LCP-A2MC,
Institute Jean-Barriol,
University of Lorraine,
FR2843 CNRS,
Rue Victor Demange,
Saint-Avold 57500, France
e-mail: bruno.azambre@univ-lorraine.fr

Christophe Volkringer

UCCS, UMR CNRS 8181, ENSCL,
Université de Lille,
Villeneuve d'Ascq 59655, France
e-mail: christophe.volkringer@ensc-lille.fr

1Corresponding author.

Manuscript received October 3, 2016; final manuscript received September 22, 2017; published online March 5, 2018. Assoc. Editor: Asif Arastu.

ASME J of Nuclear Rad Sci 4(2), 020903 (Mar 05, 2018) (13 pages) Paper No: NERS-16-1136; doi: 10.1115/1.4038223 History: Received October 03, 2016; Revised September 22, 2017

This paper deals with near past, ongoing, and planned R&D works on fission products (FPs) behavior in reactor cooling system (RCS), containment building and in filtered containment venting systems (FCVS) for severe accident (SA) conditions. All the researches are collaborative works; the overall objective is to develop confident models to be implemented in simulation software. After being initiated in 2004, researches on iodine transport through the RCS are still ongoing and for containment, the last advances are linked to the source term (ST) evaluation and mitigation (STEM) OECD/NEA project. The objective is to improve the evaluation of ST for a SA on a nuclear power plant and to reduce uncertainties on specific phenomena dealing with the chemistry of two major FPs: iodine and ruthenium. For ruthenium attention has been paid to study the amount and nature (gas/aerosol partition) of ruthenium species along the RCS. A follow-up, called STEM2, has started to reduce some remaining issues and be closer to reactor conditions. For FCVS works, the efficiencies for trapping iodine covering scrubbers and dry filters are examined to get a clear view of their abilities in SA conditions. Another part is focused on specific porous materials able to trap volatile iodine. Influence of zeolite materials parameters (nature of the counter-ions, structure, Si/Al ratio…) are tested as well as new kind of porous materials constituted by Metal organic Frameworks will also be looked at.

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Figures

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Fig. 1

Scheme of CHIP experimental line

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Fig. 2

IRSN/START experimental setup

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Fig. 3

Fluid temperatures along the quartz tube in the case of a thermal abrupt profile

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Fig. 4

Evolution of the gaseous Ru (dotted line) and the raw Ru mass in the first liquid trap for a long duration test under (60/40) steam mixture

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Fig. 5

Evolution of the Ru amount (gas and aerosols) in the first liquid trap during vaporization tests under pure air and (60%/40%)w steam/air mixture

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Fig. 6

Example for LD3 test (80 °C and R.H. 60%) of iodine releases kinetics from the painted coupon under irradiation: CH3I (left) and (I2) (right)

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Fig. 7

Simulation of CH3I(g) concentration in PHEBUS FPT3 with the iodine–paint interaction model coming from EPICUR LD tests (black curve)

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Fig. 8

(a) I2 release from deposited IOx on quartz coupon, at 120 °C and R.H. 50%, under irradiation. (b) I2 release from deposited CsI on steel coupon, at 80 °C and R.H. 50%, under irradiation.

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Fig. 9

Influence of IOx and Iaer radiolytic decomposition on gaseous I2 concentration in PHEBUS-FPT1

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Fig. 10

Setup of an I2 generation and sand trapping device

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Fig. 11

Scheme of a CH3I retention test bench at low concentration

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Fig. 12

Scheme of the PERSEE experimental setup at IRSN Saclay (France) operational at the end of 2016. A photography of the test on samples part can be shown.

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Fig. 13

Impact of functional group on I2 trapping for MIL-53 metal organic framework type [52]

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Fig. 14

Calculated adsorption energies of CH3I, I2, H2O, CO, NO, CH3Cl, Cl2 on cations (H+, Li+, Nai+, K+, Rb+, Cs+, Cu+, and Ag+)-exchanged Faujasite zeolites [53] (Reprinted with permission from Elsevier © 2017)

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Fig. 15

Relative distribution of trapped CH3I for silver-exchanged zeolites with different structural types [54] (Reprinted with permission from American Chemical Society © 2016)

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