AHMED experiments on hygroscopic and inert aerosol behaviour in LWR containment conditions

Experimental results

Jouni Mäkynen, Jorma Jokiniemi (Corresponding Author), Petri Ahonen, Esko Kauppinen, Riitta Zilliacus

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Hygroscopic NaOH, CsI, CsOH and inert Ag aerosol behaviour at different temperatures and relative humidities (RH) has been studied in a well instrumented and controlled vessel of 1.81 m3 total free volume. Homogeneous thermal-hydraulic conditions for aerosol measurement in the vessel were achieved. The aerosol number and mass concentration were measured continuously during the experiments using a Condensation Nucleus Counter and a Tapered Element Oscillating Microbalance. The particle size distribution and chemical composition in the test conditions were measured by Berner low pressure impactors. In the case of NaOH the half life of the aerosol mass concentration was more than four times longer at low RH (22%) as compared to high RH (96%). The half lives of the CsOH and CsI aerosols were only twice as long at low RH as compared to high RH. Thus at high RH (96–97%) the half lives of CsOH and CsI were twice as long as the half life for the NaOH aerosol. The faster decay of the NaOH aerosol is due to the smaller density decrease of NaOH during water condensation. CsOH particles grew rapidly to their equilibrium size at all humidities. The measured equilibrium size for CsOH aerosol agree well with the calculated particle size at different RHs. Experimental results were also compared with calculations obtained by severe accident computer codes. These calculated results will be presented in a later paper.

Original languageEnglish
Pages (from-to)45 - 59
Number of pages15
JournalNuclear Engineering and Design
Volume178
Issue number1
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

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containment
Aerosols
aerosols
humidity
Atmospheric humidity
aerosol
relative humidity
half life
experiment
Experiments
vessels
condensation
Condensation
vessel
particle size
condensation nuclei
impactors
Free volume
accidents
particle size distribution

Cite this

Mäkynen, Jouni ; Jokiniemi, Jorma ; Ahonen, Petri ; Kauppinen, Esko ; Zilliacus, Riitta. / AHMED experiments on hygroscopic and inert aerosol behaviour in LWR containment conditions : Experimental results. In: Nuclear Engineering and Design. 1997 ; Vol. 178, No. 1. pp. 45 - 59.
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abstract = "Hygroscopic NaOH, CsI, CsOH and inert Ag aerosol behaviour at different temperatures and relative humidities (RH) has been studied in a well instrumented and controlled vessel of 1.81 m3 total free volume. Homogeneous thermal-hydraulic conditions for aerosol measurement in the vessel were achieved. The aerosol number and mass concentration were measured continuously during the experiments using a Condensation Nucleus Counter and a Tapered Element Oscillating Microbalance. The particle size distribution and chemical composition in the test conditions were measured by Berner low pressure impactors. In the case of NaOH the half life of the aerosol mass concentration was more than four times longer at low RH (22{\%}) as compared to high RH (96{\%}). The half lives of the CsOH and CsI aerosols were only twice as long at low RH as compared to high RH. Thus at high RH (96–97{\%}) the half lives of CsOH and CsI were twice as long as the half life for the NaOH aerosol. The faster decay of the NaOH aerosol is due to the smaller density decrease of NaOH during water condensation. CsOH particles grew rapidly to their equilibrium size at all humidities. The measured equilibrium size for CsOH aerosol agree well with the calculated particle size at different RHs. Experimental results were also compared with calculations obtained by severe accident computer codes. These calculated results will be presented in a later paper.",
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AHMED experiments on hygroscopic and inert aerosol behaviour in LWR containment conditions : Experimental results. / Mäkynen, Jouni; Jokiniemi, Jorma (Corresponding Author); Ahonen, Petri; Kauppinen, Esko; Zilliacus, Riitta.

In: Nuclear Engineering and Design, Vol. 178, No. 1, 1997, p. 45 - 59.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - AHMED experiments on hygroscopic and inert aerosol behaviour in LWR containment conditions

T2 - Experimental results

AU - Mäkynen, Jouni

AU - Jokiniemi, Jorma

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AU - Kauppinen, Esko

AU - Zilliacus, Riitta

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N2 - Hygroscopic NaOH, CsI, CsOH and inert Ag aerosol behaviour at different temperatures and relative humidities (RH) has been studied in a well instrumented and controlled vessel of 1.81 m3 total free volume. Homogeneous thermal-hydraulic conditions for aerosol measurement in the vessel were achieved. The aerosol number and mass concentration were measured continuously during the experiments using a Condensation Nucleus Counter and a Tapered Element Oscillating Microbalance. The particle size distribution and chemical composition in the test conditions were measured by Berner low pressure impactors. In the case of NaOH the half life of the aerosol mass concentration was more than four times longer at low RH (22%) as compared to high RH (96%). The half lives of the CsOH and CsI aerosols were only twice as long at low RH as compared to high RH. Thus at high RH (96–97%) the half lives of CsOH and CsI were twice as long as the half life for the NaOH aerosol. The faster decay of the NaOH aerosol is due to the smaller density decrease of NaOH during water condensation. CsOH particles grew rapidly to their equilibrium size at all humidities. The measured equilibrium size for CsOH aerosol agree well with the calculated particle size at different RHs. Experimental results were also compared with calculations obtained by severe accident computer codes. These calculated results will be presented in a later paper.

AB - Hygroscopic NaOH, CsI, CsOH and inert Ag aerosol behaviour at different temperatures and relative humidities (RH) has been studied in a well instrumented and controlled vessel of 1.81 m3 total free volume. Homogeneous thermal-hydraulic conditions for aerosol measurement in the vessel were achieved. The aerosol number and mass concentration were measured continuously during the experiments using a Condensation Nucleus Counter and a Tapered Element Oscillating Microbalance. The particle size distribution and chemical composition in the test conditions were measured by Berner low pressure impactors. In the case of NaOH the half life of the aerosol mass concentration was more than four times longer at low RH (22%) as compared to high RH (96%). The half lives of the CsOH and CsI aerosols were only twice as long at low RH as compared to high RH. Thus at high RH (96–97%) the half lives of CsOH and CsI were twice as long as the half life for the NaOH aerosol. The faster decay of the NaOH aerosol is due to the smaller density decrease of NaOH during water condensation. CsOH particles grew rapidly to their equilibrium size at all humidities. The measured equilibrium size for CsOH aerosol agree well with the calculated particle size at different RHs. Experimental results were also compared with calculations obtained by severe accident computer codes. These calculated results will be presented in a later paper.

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