In tests simulating exposure conditions of the confinement system following power surge and loss-ofcoolant accidents, the iodine retention efficiencies of carbon samples were measured. In both tests, the iodine retention efficiency decreased with increased carbon service, but was within specification for up to 42 months of service. In methyl iodide radio lysis tests, a gamma radiation field of ~1.7 x 10 7 rads/hr did not significantly extend the effectiveness of carbon for methyl iodide adsorption.
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