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Abstract

FARO is a large multi-purpose test facility in which several phenomena can be studied under simulated accident conditions by out-of-pile experiments. The present test programme concerns LMFBR safety research. The melting process of 100 kg of UO(2) in a Joule heating furnace and the procedure for melt delivery to the test sections are presented. Results concern melt temperature measurements, melt jet interactions with stainless steel plates, melt freezing in preheated vertical tubes and 100kg-scale molten UO(2)/400 C-Na interaction (TERMOS). Melt temperatures around 3000 C were measured using ultrasonic sensors and pyrometers. Plate ablation tests show slight ablation for grazing incidences (5 ) and no ablation for incidences larger than 45 . Freezing tests show plugging of the tubes after melt penetration. For the TERMOS test, 3 successive vessel pressurisations occur, suggesting rapid sodium vapour production events caused by the fragmentation of part of the UO(2). The theoretical activity in support of the FARO programme is briefly outlined. Computer code developments are reviewed and calculation examples given. Results obtained with the CEA computer code BUCOGEL for the freezing test are presented. Model limitations and required improvements are mentioned.

Additional information

Authors: HOHMANN H, JRC Ispra (IT);MAGALLON D, JRC Ispra (IT);BENUZZI A, JRC Ispra (IT);JONES A V, JRC Ispra (IT);YERKESS A, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Seminar on the Commission Contribution to Reactor Safety Research, Varese (IT), Nov. 20-24, 1989
Availability: Available from (1) as Paper EN 35133 ORA
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