Experimental Study on Transport Behavior of Cesium Iodide in the Reactor Coolant System under LWR Severe Accident Conditions

Naoya Miyahara, Shuhei Miwa, Mélany Gouëllo, Junpei Imoto, Naoki Horiguchi, Isamu Sato, Masahiko Osaka

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In order to clarify the CsI transport behavior with a focus on the mechanisms of gaseous iodine formation in the reactor coolant system of LWR under a sever accident condition, a reproductive experiment of CsI transport behavior was conducted using a facility equipped with a temperature gradient tube. Various analyses on deposits and airborne materials during transport could elucidate two mechanisms for the gaseous iodine formation. One was the gaseous phase chemical reaction in Cs-I-O-H system at relatively high temperature region, which led to gaseous iodine transport to the lower temperature region without any further changes in gas species due to the kinetics limitation effects. The other one was newly found in this study, which is the chemical reaction between condensed phase of CsI on walls or in the aerosol particles with steam to form Cs oxides with the release of gaseous iodine.
Original languageEnglish
JournalNuclear Materials and Energy
Publication statusSubmitted - 2019
MoE publication typeA1 Journal article-refereed

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Cesium iodide
cesium iodides
coolants
accidents
Iodine
Coolants
iodine
Accidents
reactors
Chemical reactions
chemical reactions
Steam
Aerosols
steam
Thermal gradients
Oxides
Particles (particulate matter)
temperature gradients
aerosols
Deposits

Cite this

Miyahara, N., Miwa, S., Gouëllo, M., Imoto, J., Horiguchi, N., Sato, I., & Osaka, M. (2019). Experimental Study on Transport Behavior of Cesium Iodide in the Reactor Coolant System under LWR Severe Accident Conditions. Manuscript submitted for publication.
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abstract = "In order to clarify the CsI transport behavior with a focus on the mechanisms of gaseous iodine formation in the reactor coolant system of LWR under a sever accident condition, a reproductive experiment of CsI transport behavior was conducted using a facility equipped with a temperature gradient tube. Various analyses on deposits and airborne materials during transport could elucidate two mechanisms for the gaseous iodine formation. One was the gaseous phase chemical reaction in Cs-I-O-H system at relatively high temperature region, which led to gaseous iodine transport to the lower temperature region without any further changes in gas species due to the kinetics limitation effects. The other one was newly found in this study, which is the chemical reaction between condensed phase of CsI on walls or in the aerosol particles with steam to form Cs oxides with the release of gaseous iodine.",
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Experimental Study on Transport Behavior of Cesium Iodide in the Reactor Coolant System under LWR Severe Accident Conditions. / Miyahara, Naoya; Miwa, Shuhei; Gouëllo, Mélany; Imoto, Junpei; Horiguchi, Naoki; Sato, Isamu; Osaka, Masahiko.

In: Nuclear Materials and Energy, 2019.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Experimental Study on Transport Behavior of Cesium Iodide in the Reactor Coolant System under LWR Severe Accident Conditions

AU - Miyahara, Naoya

AU - Miwa, Shuhei

AU - Gouëllo, Mélany

AU - Imoto, Junpei

AU - Horiguchi, Naoki

AU - Sato, Isamu

AU - Osaka, Masahiko

PY - 2019

Y1 - 2019

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AB - In order to clarify the CsI transport behavior with a focus on the mechanisms of gaseous iodine formation in the reactor coolant system of LWR under a sever accident condition, a reproductive experiment of CsI transport behavior was conducted using a facility equipped with a temperature gradient tube. Various analyses on deposits and airborne materials during transport could elucidate two mechanisms for the gaseous iodine formation. One was the gaseous phase chemical reaction in Cs-I-O-H system at relatively high temperature region, which led to gaseous iodine transport to the lower temperature region without any further changes in gas species due to the kinetics limitation effects. The other one was newly found in this study, which is the chemical reaction between condensed phase of CsI on walls or in the aerosol particles with steam to form Cs oxides with the release of gaseous iodine.

M3 - Article

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

SN - 2352-1791

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