Radioiodine Test Facility

The adsorption of gaseous iodine species on surfaces has received much attention in the reactor safety literature. Varieties of metal, concrete and painted surfaces are in a reactor containment building. The gaseous forms of iodine will interact with these surfaces. The interactions are usually thought to involve a rapid physical adsorption followed by a slower chemical reaction. Dry (or moist, but not wet) surfaces of both stainless steel and organic (vinyl-, epoxy-, polyurethane-) paint have large capacities for absorbing molecular iodine. The adsorption rate of molecular iodine on the dry surfaces is close to the limit dictated by gas-phase mass transport. Intermediate-scale studies performed in the Radioiodine Test Facility have shown that about 75 to 95% of airborne molecular... 

J.M. Ball, et Al., INTERNATIONAL STANDARD PROBLEM (ISP) NO. 41 Computer Code Exercise Based on a Radioiodine Test Facility (RTF) E5q)eriment on Iodine Behaviour in Containment under Severe Accident Conditions , In Proceedings of OECD Workshop on Iodine Aspects of Severe Accident Management, NEA/CSNI/R(99)7, Vantaa, Finland, 1999. 

J.M. Ball, W.C.H. Kupferschmidt and J.C. Wren, Phase 2 Radioiodine Test Facility Experimental Program , In Proceedings of the Fourth CSNI Workshop on the Chemistry of Iodine in Reactor... 

Figure 7.37. Schematic diagram of the Radioiodine Test Facility (RTF) (Ritzman, 1991)...

In Canada, the Liric model was developed (Wren et al., 1991) and is still undergoing improvement. Liric is a comprehensive model of an essentially mechanistic nature, showing similarities in the reaction sets used for the Inspect code described above. Liric was developed to predict the time-dependent behavior of iodine in the containment under a variety of reactor accident conditions. Out of the large number of reactions involving physical and chemical processes, aqueous thermal reactions of iodine are considered, as well as water radiolysis processes and the interaction of the radiolysis products with aqueous iodine species. In addition, radiolytic decomposition of organic substances in the aqueous phase, formation and decomposition of organoiodine compounds, iodine reactions with aqueous impurities such as buffers and metal ions, mass transfer between the aqueous and gas phases and, finally, adsorption of gaseous I2 onto surfaces and its desorption from them are included in the model. The Liric model has been developed in close cooperation with the experimental work carried out in the Radioiodine Test Facility. 

Furrer, M., Cripps, R. Validation of Impair 2 code using ACE test results from the Radioiodine Test Facility (RTF). Proc. 3. CSNI Workshop on Iodine Chemistry in Reactor Safety, Tokai-mura, Japan, 1991 Report JAERI-M 92-012 (1992), p. 329-344 Furrer, M., Gloor, T. Effects of P , y radiolysis on cesium iodide solutions in contact with simulated silver metal aerosol. Proc. Specialists Workshop on Iodine Chemistry in Reactor Safety, Harwell, England, 1985 Report AERE R 11974 (1986), p. 193-199 Gauvain, J., et al. Iode 2.0 User manual. Report SEAC/91/04 (1991)... 

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