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Tritium storage beds at ITER are likely to use uranium as a getter material with a total inventory of 150 g T(2) at 75 % stoichiometric composition of UT(3). A storage bed design is proposed which is directly extrapolated from the JET uranium beds, which already have a U238 inventory of 4.284 kg. Three alternative approaches to calorimetry for in situ tritium inventory accounting are discussed. The favoured solution uses microporous thermal insulation operating in a hydrogen atmosphere. This design is shown to meet all operational and safety requirements. The accuracy of calorimetric assay to +/- 0.1 % requires only the measurement of a temperature difference to +/- 0.l K and stabilisation of the ambient reference temperature of 300 K to +/- 0.1 K.

Additional information

Authors: HEMMERICH J L, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(94)24 EN (1994) 12 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199411456 / Last updated on: 1994-12-06
Original language: en
Available languages: en