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Cold trap and cryogenic molecular sieve adsorber : components for tritium extraction from the purge gas of the HCPB-breeder blanket for ITER

Bekris, N.; Caldwell-Nichols, C.; Hutter, E.

Abstract:
The helium purge gas loop for tritium extraction from the ceramic breeder blanket (Helium Cooled Pebble Bed, HCPB) of ITER includes a liquid nitrogen cooled cold trap for the retention of tritiated water produced in the breeder. Including 0.1% hydrogen in the He purge gas enhances the tritium extraction from the blanket as it allows an isotopic exchange process to take place between the protium in the gas phase and the tritium generated by nuclear reactions and fixed in the breeder. Purging the breeder with hydrogen inevitably produces some tritiated water which can be removed very efficiently by the mean of a cold trap working at -100°C. The final He purification requires a liquid nitrogen cooled molecular sieve adsorber bed to be included in the loop to extract the various isotopic species of hydrogen (H₂, T₂, HT) as well as N₂ and O₂. The existing cold trap has already been operated in a preliminary test rig under once through conditions to obtain layout data for the final design. The matrix of operation parameters and measured humidities in the helium at the outlet of the trap allow us to define the cooled surface needed for hig ... mehr


Zugehörige Institution(en) am KIT Hauptabteilung Versuchstechnik (HVT)
Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2003
Sprache Englisch
Identifikator ISSN: 0920-3796, 1873-7196
KITopen ID: 110052354
HGF-Programm 31.07.03; LK 01
Erschienen in Fusion engineering and design
Band 69
Heft 1-4
Seiten 21-25
Bemerkung zur Veröffentlichung 22nd Symp.on Fusion Technology (SOFT), Helsinki, SF, September 9-13, 2002, Auch auf CD-ROM
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