Abstract
This publication describes the second version of the Iodine Severe Accident Code (IMPAIR 2.2). This code aims to model postulated conditions of iodine chemistry present in a containment (sump, deposition and atmosphere) during a postulated severe accident in a LWR by using 29 differential equations and 69 rate constants. These equations model the behavior of various iodine species in the sump and the gas phase. Apart from purely chemical equilibria, the mass transport of aerosols, elemental iodine, organoiodine species and droplet carry-over during pressure release while venting are also described. Various improvements and extensions have been made since the original publication. Meanwhile the multi-compartment version, IMPAIR 2/M has become available. It will be updated with the revised models described here as well as other changes. The updated multi-compartment code will be designated IMPAIR 3 and will replace the single-compartment code IMPAIR 2.2. It should be available in 1992. The revised code IMPAIR 2.2, although it has not reached the maturity of an `assessed code`, is significantly improved in its function to model the iodine chemistry of severe accident scenarios in a containment using a mainly phenomenological approach. This improvement was achieved largely through data available from ACE/RTF tests. Two sets
More>>
Cripps, R;
[1]
Furrer, M;
[2]
Hellmann, S;
Funke, F
[3]
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Bundesamt fuer Energiewirtschaft, Wuerenlingen (Switzerland). Abt. fuer die Sicherheit der Kernanlagen
- Siemens AG Unternehmensbereich KWU, Erlangen (Germany)
Citation Formats
Cripps, R, Furrer, M, Hellmann, S, and Funke, F.
User`s handbook for the iodine severe accident behavior code IMPAIR 2.2.
Switzerland: N. p.,
1992.
Web.
Cripps, R, Furrer, M, Hellmann, S, & Funke, F.
User`s handbook for the iodine severe accident behavior code IMPAIR 2.2.
Switzerland.
Cripps, R, Furrer, M, Hellmann, S, and Funke, F.
1992.
"User`s handbook for the iodine severe accident behavior code IMPAIR 2.2."
Switzerland.
@misc{etde_10157648,
title = {User`s handbook for the iodine severe accident behavior code IMPAIR 2.2}
author = {Cripps, R, Furrer, M, Hellmann, S, and Funke, F}
abstractNote = {This publication describes the second version of the Iodine Severe Accident Code (IMPAIR 2.2). This code aims to model postulated conditions of iodine chemistry present in a containment (sump, deposition and atmosphere) during a postulated severe accident in a LWR by using 29 differential equations and 69 rate constants. These equations model the behavior of various iodine species in the sump and the gas phase. Apart from purely chemical equilibria, the mass transport of aerosols, elemental iodine, organoiodine species and droplet carry-over during pressure release while venting are also described. Various improvements and extensions have been made since the original publication. Meanwhile the multi-compartment version, IMPAIR 2/M has become available. It will be updated with the revised models described here as well as other changes. The updated multi-compartment code will be designated IMPAIR 3 and will replace the single-compartment code IMPAIR 2.2. It should be available in 1992. The revised code IMPAIR 2.2, although it has not reached the maturity of an `assessed code`, is significantly improved in its function to model the iodine chemistry of severe accident scenarios in a containment using a mainly phenomenological approach. This improvement was achieved largely through data available from ACE/RTF tests. Two sets of test data with drastic pH difference were used to validate the updated code. The calculated results show a very good correlation for all iodine species in the gas and water phases and in deposition to within an order of magnitude. These validation results were presented at the Third CSNI Workshop on Iodine Chemistry, Tokai-Mura, Japan. (author) 15 tabs., 19 refs.}
place = {Switzerland}
year = {1992}
month = {Feb}
}
title = {User`s handbook for the iodine severe accident behavior code IMPAIR 2.2}
author = {Cripps, R, Furrer, M, Hellmann, S, and Funke, F}
abstractNote = {This publication describes the second version of the Iodine Severe Accident Code (IMPAIR 2.2). This code aims to model postulated conditions of iodine chemistry present in a containment (sump, deposition and atmosphere) during a postulated severe accident in a LWR by using 29 differential equations and 69 rate constants. These equations model the behavior of various iodine species in the sump and the gas phase. Apart from purely chemical equilibria, the mass transport of aerosols, elemental iodine, organoiodine species and droplet carry-over during pressure release while venting are also described. Various improvements and extensions have been made since the original publication. Meanwhile the multi-compartment version, IMPAIR 2/M has become available. It will be updated with the revised models described here as well as other changes. The updated multi-compartment code will be designated IMPAIR 3 and will replace the single-compartment code IMPAIR 2.2. It should be available in 1992. The revised code IMPAIR 2.2, although it has not reached the maturity of an `assessed code`, is significantly improved in its function to model the iodine chemistry of severe accident scenarios in a containment using a mainly phenomenological approach. This improvement was achieved largely through data available from ACE/RTF tests. Two sets of test data with drastic pH difference were used to validate the updated code. The calculated results show a very good correlation for all iodine species in the gas and water phases and in deposition to within an order of magnitude. These validation results were presented at the Third CSNI Workshop on Iodine Chemistry, Tokai-Mura, Japan. (author) 15 tabs., 19 refs.}
place = {Switzerland}
year = {1992}
month = {Feb}
}