Published November 1986 | Version v1
Report Restricted

The removal of gaseous impurities from the primary circuit in high temperature reactors with cerium-mischmetal-getters

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Description

The use of getters to remove tritium and other gaseous impurities (especially H2, N2 and CO) from helium circuits in nuclear reactors has been investigated. The loading capcity of beds, containing small cerium-mischmetal chips has been tested for several typical conditions. The results show that it is possible to use getters to purify inert gas streams for given boundary conditions. High CO-levels, however, lead to a poisoning (passivation) of the getter material. The effect of poisoning is cumulative. A mathematical model describes the behavior of CO in this kind of getter. Safety tests under possible accident conditions were made with the highly reactive cerium-mischmetal chips. The results show that there isn't a critical problem in using this material in the form of a chemical reactive getter bed near a nuclear reactor in the investigated range of accident conditions. (orig.)

Abstract (German)

Die Moeglichkeit der kostenguenstigen, einfachen Entfernung von Tritium und anderen Verunreinigungen (insbesondere H2, N2 und CO) aus Heliumkreislaeufen durch Getterung wird experimentell untersucht. An modellhaften Festbetten, bestehend aus Cer-Mischmetall-Spaenen wird die Belastbarkeit solcher Getter bei den typischen Einsatzbedingungen getestet. Die Ergebnisse zeigen, dass es prinzipiell moeglich ist, dieses Gasreinigungsverfahren bei den geforderten Randbedingungen zu betreiben. Als begrenzender Faktor stellt sich das CO-Angebot heraus, welches zu Vergiftungserscheinungen im Getter fuehrt. Ein mathematisches Modell versucht das CO-Verhalten ansatzweise zu beschreiben. Stoerfallsimulationen mit den reaktionsfreudigen Cer-Mischmetall-Spaenen zeigen, dass keine sicherheitstechnische Bedenken bestehen fuer den Einsatz eines Festbettes am Reaktor bei den beschriebenen Randbedingungen. (orig.)

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Additional details

Additional titles

Original title (German)
Entfernung gasfoermiger Verunreinigungen aus dem Primaerkreislauf von Hochtemperaturreaktoren mit Hilfe von Cer-Mischmetall-Gettern

Publishing Information

Imprint Pagination
169 p.
Report number
Juel--2100

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
19028841
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
ACCIDENTS; ACTIVATION ENERGY; BENCH-SCALE EXPERIMENTS; CARBON MONOXIDE; CERIUM BASE ALLOYS; CHEMICAL COMPOSITION; CONTAINERS; COOLANT CLEANUP SYSTEMS; FUNCTIONAL MODELS; GETTERING; GETTERS; HELIUM; HYDROGEN; MATHEMATICAL MODELS; NITROGEN; POISONING; PRODUCTION; RARE EARTH ALLOYS; SAFETY; SIMULATION; SURFACE AREA; TEMPERATURE DEPENDENCE; TIME DEPENDENCE; TRITIUM
Descriptors DEC
ALLOYS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON COMPOUNDS; CARBON OXIDES; CERIUM ALLOYS; CHALCOGENIDES; ELEMENTS; ENERGY; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; NONMETALS; NUCLEI; ODD-EVEN NUCLEI; OXIDES; OXYGEN COMPOUNDS; RADIOISOTOPES; RARE GASES; YEARS LIVING RADIOISOTOPES