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Selenium release from iodine filters in the event of brine ingress into a repository; Selenfreisetzung aus Jodfiltern bei Laugeneinbruch in ein Endlager

Technical Report:

Abstract

In the course of studies of reaction processes in the event of emergency brine ingress into a repository, the radionuclide Se-79 which also is relevant for long-term considerations (T 1/2=6,5x10{sup 4} a) was included into the emergency studies. During higher temperature processes, such as dissolution steps and sealing processes of fission products in glass or ceramics for their ultimate disposal, selenium may be released. Metallic selenium for instance evaporates at about 680 C, and SeO{sub 2} sublimates already at 315 C, and thus gets into the waste gas flow. Together with the also volatile iodine, that waste gas is purified by filters (AC 6120) impregnated with AgNO{sub 3}. Selenium is bonded to those iodine filters in the form of silverselenium compounds, for instance as Ag{sub 2}SeO{sub 3} or Ag{sub 2}SeO{sub 4}, and is stored together with them. The behaviour of those filters charged with iodine and selenium, with regard to brines was studied assuming that they are stored in iron barrels and that therefore iron as a coreactant is available in the vicinity. (orig./HP) [Deutsch] Im Rahmen der Untersuchungen von Reaktionsablaeufen beim stoerfallbedingten Laugeneinbruch in eine Endlagerstaette wurde das fuer Langzeitbetrachtungen ebenfalls relevante Radionuklid Se-79 (T{sub 1/2}=6,5x10{sup 4} a) in  More>>
Publication Date:
Apr 01, 1994
Product Type:
Technical Report
Report Number:
Juel-2896
Reference Number:
SCA: 052002; 400201; PA: DEN-94:0FN381; EDB-95:012737; SN: 95001306083
Resource Relation:
Other Information: PBD: Apr 1994
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; SELENIUM 79; UNDERGROUND DISPOSAL; CHEMICAL REACTIONS; SELENIUM; SELENIUM COMPOUNDS; LEACHING; FISSION PRODUCT RELEASE; SAFETY; AIR FILTERS; RADIOACTIVE WASTE PROCESSING; OFF-GAS SYSTEMS; SILVER NITRATES; RADIOACTIVE WASTE DISPOSAL; SALT CAVERNS; WATER INFLUX; CASKS; IRON; 052002; 400201; WASTE DISPOSAL AND STORAGE; CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
OSTI ID:
10105660
Research Organizations:
Forschungszentrum Juelich GmbH (Germany). Inst. fuer Sicherheitsforschung und Reaktortechnik
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Journal ID: ISSN 0944-2952; Other: ON: DE95726741; TRN: DE94FN381
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
32 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ullrich, W, and Riedel, H J. Selenium release from iodine filters in the event of brine ingress into a repository; Selenfreisetzung aus Jodfiltern bei Laugeneinbruch in ein Endlager. Germany: N. p., 1994. Web.
Ullrich, W, & Riedel, H J. Selenium release from iodine filters in the event of brine ingress into a repository; Selenfreisetzung aus Jodfiltern bei Laugeneinbruch in ein Endlager. Germany.
Ullrich, W, and Riedel, H J. 1994. "Selenium release from iodine filters in the event of brine ingress into a repository; Selenfreisetzung aus Jodfiltern bei Laugeneinbruch in ein Endlager." Germany.
@misc{etde_10105660,
title = {Selenium release from iodine filters in the event of brine ingress into a repository; Selenfreisetzung aus Jodfiltern bei Laugeneinbruch in ein Endlager}
author = {Ullrich, W, and Riedel, H J}
abstractNote = {In the course of studies of reaction processes in the event of emergency brine ingress into a repository, the radionuclide Se-79 which also is relevant for long-term considerations (T 1/2=6,5x10{sup 4} a) was included into the emergency studies. During higher temperature processes, such as dissolution steps and sealing processes of fission products in glass or ceramics for their ultimate disposal, selenium may be released. Metallic selenium for instance evaporates at about 680 C, and SeO{sub 2} sublimates already at 315 C, and thus gets into the waste gas flow. Together with the also volatile iodine, that waste gas is purified by filters (AC 6120) impregnated with AgNO{sub 3}. Selenium is bonded to those iodine filters in the form of silverselenium compounds, for instance as Ag{sub 2}SeO{sub 3} or Ag{sub 2}SeO{sub 4}, and is stored together with them. The behaviour of those filters charged with iodine and selenium, with regard to brines was studied assuming that they are stored in iron barrels and that therefore iron as a coreactant is available in the vicinity. (orig./HP) [Deutsch] Im Rahmen der Untersuchungen von Reaktionsablaeufen beim stoerfallbedingten Laugeneinbruch in eine Endlagerstaette wurde das fuer Langzeitbetrachtungen ebenfalls relevante Radionuklid Se-79 (T{sub 1/2}=6,5x10{sup 4} a) in die Stoerfalluntersuchungen mit einbezogen. Bei Verfahren unter hoeheren Temperaturen, z.B. Aufloeseschritten und Einschmelzprozessen der Spaltprodukte in Glaeser oder Keramiken fuer deren Endlagerung, kann Selen freigesetzt werden. So verdampft z.B. metallisches Selen bei ca. 680 C und SeO{sub 2} sublimiert bereits bei 315 C und gelangt somit in den Abgasstrom. Zusammen mit dem ebenfalls fluechtigen Jod wird dieser Abgasstrom ueber mit AgNO{sub 3} impraegnierter Filter (AC 6120) gereinigt. Auf diesen Jodfiltern wird das Selen in Form von Silber-Selenverbindungen, z.B. als Ag{sub 2}SeO{sub 3} oder Ag{sub 2}SeO{sub 4}, gebunden und gelangt mit diesen zur Endlagerung. Das Verhalten dieser mit Jod und Selen beaufschlagten Filter gegenueber Salz-Laugen wurde untersucht. Hierbei wurde angenommen, dass die Filter in Eisenfaessern verpackt endgelagert werden und somit Eisen als Reaktionspartner im nahen Umfeld vorhanden ist. (orig./HP)}
place = {Germany}
year = {1994}
month = {Apr}
}