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LMFBR source term experiments with rupture disk discharge under sodium; SNR-Quelltermexperimente mit Berstscheibenentladungen unter Natrium

Technical Report:

Abstract

In the frame of the KfK research program FAUST, contributions are given to the assessment of the instantaneous source term in case of an LMFBR loss-of-flow accident with expanding fuel or sodium vapour. The main goal of the program is to achieve information, mainly by experiments, on the retention capability of the primary sodium pool for fuel and fission products. For that purpose, it is necessary to investigate the interaction of bubble and aerosol behaviour after a pressure discharge, and the subsequent aerosol transport. After a series of water tests (FAUST-1), rupture disk discharge tests under 500 C sodium up to 3.81 MPa were performed during the phase FAUST-2 with the two test facilities 2A (about 2 liters of sodium) and 2B (about 200 liters of sodium). The discharge tests were performed with pressurized argon gas and admixtures of the simulation materials Cs, Csl, Nal, l{sub 2}, SrO, and UO{sub 2}. Cs was a liquid, l{sub 2} vapour, and all other substances solid particles. Besides UO{sub 2}, non-radioactive material was used (natural isotopes). The retention capability of liquid sodium is expressed by retention factors RF. In general, RF is defined as the mass ratio of discharged amount, and the amount  More>>
Publication Date:
May 01, 1993
Product Type:
Technical Report
Report Number:
KFK-5082
Reference Number:
SCA: 210500; PA: DEN-94:0F0725; EDB-94:023929; ERA-19:006626; NTS-94:015655; SN: 94001136172
Resource Relation:
Other Information: PBD: May 1993
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; SNR REACTOR; SOURCE TERMS; FLOW BLOCKAGE; SODIUM; RELIEF VALVES; BUBBLES; OSCILLATIONS; ENTRAINMENT; REACTOR EXPERIMENTAL FACILITIES; B CODES; AEROSOLS; FISSION PRODUCT RELEASE; 210500; POWER REACTORS, BREEDING
OSTI ID:
10119832
Research Organizations:
Kernforschungszentrum Karlsruhe GmbH (Germany). Lab. fuer Aerosolphysik und Filtertechnik (LAF); Kernforschungszentrum Karlsruhe GmbH (Germany). Projekt Nukleare Sicherheitsforschung
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Journal ID: ISSN 0303-4003; Other: ON: DE94734066; TRN: DE94F0725
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
117 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Minges, J, and Schuetz, W. LMFBR source term experiments with rupture disk discharge under sodium; SNR-Quelltermexperimente mit Berstscheibenentladungen unter Natrium. Germany: N. p., 1993. Web.
Minges, J, & Schuetz, W. LMFBR source term experiments with rupture disk discharge under sodium; SNR-Quelltermexperimente mit Berstscheibenentladungen unter Natrium. Germany.
Minges, J, and Schuetz, W. 1993. "LMFBR source term experiments with rupture disk discharge under sodium; SNR-Quelltermexperimente mit Berstscheibenentladungen unter Natrium." Germany.
@misc{etde_10119832,
title = {LMFBR source term experiments with rupture disk discharge under sodium; SNR-Quelltermexperimente mit Berstscheibenentladungen unter Natrium}
author = {Minges, J, and Schuetz, W}
abstractNote = {In the frame of the KfK research program FAUST, contributions are given to the assessment of the instantaneous source term in case of an LMFBR loss-of-flow accident with expanding fuel or sodium vapour. The main goal of the program is to achieve information, mainly by experiments, on the retention capability of the primary sodium pool for fuel and fission products. For that purpose, it is necessary to investigate the interaction of bubble and aerosol behaviour after a pressure discharge, and the subsequent aerosol transport. After a series of water tests (FAUST-1), rupture disk discharge tests under 500 C sodium up to 3.81 MPa were performed during the phase FAUST-2 with the two test facilities 2A (about 2 liters of sodium) and 2B (about 200 liters of sodium). The discharge tests were performed with pressurized argon gas and admixtures of the simulation materials Cs, Csl, Nal, l{sub 2}, SrO, and UO{sub 2}. Cs was a liquid, l{sub 2} vapour, and all other substances solid particles. Besides UO{sub 2}, non-radioactive material was used (natural isotopes). The retention capability of liquid sodium is expressed by retention factors RF. In general, RF is defined as the mass ratio of discharged amount, and the amount which is detected in the cover gas for the relevant species. From sampling immediately after the discharge, the instantaneous retention factors are deduced. From retarded sampling, the `delayed factors` follow. High pressure discharge creates two important removal mechanisms, namely `impaction by inertia relative to the bubble oscillations` and `wash-out by sedimentation of entrained sodium droplets`. On the other hand, the retention of particles enclosed in a buoyantly rising bubble is significantly smaller. (orig.) [Deutsch] Im KfK-Versuchsprogramm FAUST werden Beitraege zur Abschaetzung des instantanen Quellterms bei einem SNR-Kuehlmitteldurchsatzstoerfall mit expandierendem Brennstoff- oder Natriumdampf geliefert. Im Vordergrund steht die - vorwiegend experimentelle - Erfassung der Rueckhaltefaehigkeit des Kuehlmittels fuer Brennstoff und Spaltprodukte. Dazu ist es notwendig, das Zusammenwirken von Blasen- und Aerosolverhalten nach einer Druckentladung und den Aerosoltransport zu untersuchen. Nach einer Serie von Wasserversuchen (FAUST-1) wurden in der Phase FAUST-2 Versuche mit Berstscheibenentladungen unter Natrium bis 500 C und 3,81 MPa durchgefuehrt mit den beiden Versuchsstaenden 2A (etwa 2 Liter Natrium) und 2B (etwa 200 Liter Natrium). Dem Argon-Druckgas wurden die Simulationsmaterialien Cs, Csl, Nal, l{sub 2}, SrO und UO{sub 2} beigemischt. Cs war fluessig, l{sub 2} dampffoermig, alle anderen Substanzen partikelfoermig. Ausser UO{sub 2} wurde nur nichtradioaktives Material (natuerliches Isotopengemisch) benutzt. Die Rueckhaltefaehigkeit des fluessigen Natriums wird durch Rueckhaltefaktoren RF erfasst. Generell wird RF definiert als das Massenverhaeltnis aus entladener Menge und im Covergas nachgewiesener Menge der jeweiligen Substanz. Aus der Probenahme unmittelbar nach der Entladung erhaelt man die instantanen Werte, aus einer spaeteren Probenahme die verzoegerten Werte. Da der Entladungsvorgang unter erhoehtem Druck ablaeuft, werden die beiden wichtigen Abscheidemechanismen ``Impaktion infolge Massentraegheit relativ zu den Blasenoszillationen`` und ``auswaschen durch Sedimentation des Fluessigkeitseintrags in Blase und Covergas (Entrainment)`` wirksam. Andererseits ist das Rueckhaltevermoegen fuer Partikeln, die in aufsteigenden Blasen eingeschlossen sind, deutlich kleiner. (orig.)}
place = {Germany}
year = {1993}
month = {May}
}