Reference

The interaction of cesium iodide with boric acid in the temperature range 100 to 1000°

The interaction of cesium iodide with boric acid in the temperature range 100 to 1000°.Some chemicals with cas registry numbers like 10034-85-2 and 10043-35-3 are also used. Bowsher, B. R.; Bruce, D. M.; Dickinson, S. (Chem. Div., UK At. Energy Auth., Dorchester/Dorset, UK). U. K. At. Energy Res. Establ., [Rep.], AERE-R, AERE R 11974, Proc. Spec. Workshop Iodine Chem., 1985, 275-89 (English) 1986. CODEN: UKRGAL. ISSN: 0436-9734. DOCUMENT TYPE: Report CA Section: 71 (Nuclear Technology) The interaction of CsI [7789-17-5] with H3BO3 [10043-35-3] was studied over the temp. range 100 to 1000° under a variety of conditions. Expts. were performed to characterize the mechanism and products of the reaction and to assess the likelihood and extent of the reaction occurring in severe reactor accidents. Mixts. of CsI and H3BO3 were heated, and the volatilized material passed through a thermal gradient tube. The effects of adding steam and CsOH vapor to these systems were studied. A wide range of anal. techniques was used to det. the nature of the gaseous and solid reaction products, and kinetic data were obtained by thermal anal. Substantial decompn. of CsI was obsd. in the presence H3BO3 at temp. >700° producing complex Cs borates and volatile I species. This reactin occurred in both the condensed and vapor phases. Matrix isolation studied demonstrated that the volatile I was released at low temp. (~100°) as HI, together with HI-water adducts and polymeric species. Above 400° mass spectrometric studies showed that the prodn. of I2 also became significant. The studies also indicated that the reaction was not prevented by the presence of CsOH vapor. Thermogravimetric anal. showed that the condensed-phase reaction followed diffusion-controlled kinetics. The extent of the reaction between CsI and H3BO3 in a reactor accident would depend on the phenomenol. of the accident. In the presence of steam, H3BO3 is very volatile and would not co-condense with CsI and, therefore, no condensed-phase reaction would occur. However, significant reaction could occur where one or both reactants were in the vapor phase, and this could have a significant impact on source term calcns. .

Effects of ionizing radiation on the transport chemistry of cesium iodide

Effects of ionizing radiation on the transport chemistry of cesium iodide. Elrick, R. M.; Powers, D. A. (Sandia Natl. Lab., Albuquerque, NM, USA). U. K. At. Energy Res. Establ., [Rep.], AERE-R, AERE R 11974, Proc. Spec. Workshop Iodine Chem., 1985, 291-313 (English) 1986. CODEN: UKRGAL. ISSN: 0436-9734. DOCUMENT TYPE: Report CA Section: 71 (Nuclear Technology) Section cross-reference(s): 68 Mixts. of CsI [7789-17-5] or AgI vapors in steam and H at 1170 K were passed over stainless steel in a radiation field produced by a 60Co source. CsI and AgI dissocd., and the I passed through the system. Cs was attached to oxide layers on the stainless steel. Dissocn. of I- vapors and Cs reaction were not obsd. 7783-96-2 and 7553-56-2 which are cas registry numbers of substances are two of reagents here. in similar expts. done without a radiation field. Thermochem. analyses of the Cs-I-O-H system in the presence of ionizing radiation are presented and used to explain the reactions of CsI. .