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Release of radio iodine from uranium di oxide during reactor operation



Release of radio iodine from uranium di oxide during reactor operation



International Journal of Applied Radiation & Isotopes 32(6): 397-402



The formation mechanisms of radioactive organic iodides were studied during reactor operation and during scram using a specially designed experimental set-up. The fractional release rates of 132I, 133I and 135I from UO2 pellets at 250.degree. C were determined as 8.3 .times. 10-6 (R/B [birth rate]); the direct recoil process was the most predominant release process. These released nuclides were plated-out on the wall. The apparent desorption rates of 131I, 133I and 132I from the decay of 132Te were averaged at (3.2 .+-. 0.7) .times. 10-4/h for organic iodides and at (2.2 .+-. 1.7) .times. 10-4/h for inorganic iodides during reactor operation. Under the reactor scram, the desorption rates of organic iodides decreased to (6.5 .+-. 1.2) .times. 10-5/h for 131I and 133I, while the value increased by 1 order for 132Te. These experimental observations were explained by the radiation-induced radical reactions leading to the formation of organic iodides.

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Accession: 006306376

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