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首页> 美国政府科技报告 >Use of Activated Charcoal for 220Rn Adsorption for Operations Associated with the Uranium Deposit in the Auxiliary Charcoal Bed at the Molten Salt Reactor Experiment Facility
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Use of Activated Charcoal for 220Rn Adsorption for Operations Associated with the Uranium Deposit in the Auxiliary Charcoal Bed at the Molten Salt Reactor Experiment Facility

机译：使用活性炭进行220Rn吸附操作与熔盐反应器实验设施中辅助炭床中的铀矿床相关的操作

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Measurements have been collected with the purpose of evaluating the effectiveness of activated charcoal for the removal of 220Rn from process off- gas at the Molten Salt Reactor Experiment (MSRE) at Oak Ridge National Laboratory. A series of bench-scale tests were performed at superficial flow velocities of 10, 18, 24, and 33 cm s(sup-1) (20, 35, 47, and 65 ft min(sup-1)) with a continuous input concentration of 220Rn in the range orf 9 x 10(sup 3) pCi L(sup-1). In addition, two tests were performed at the MSRE facility by flowing helium through the auxiliary charcoal bed uranium deposit. These tests were performed so that the adsorptive effectiveness could be evaluated with a relatively high concentration of 220Rn. In addition to measuring the effectiveness of activated charcoal as a 220Rn adsorption media, the source term for available 220Rn in the deposit is actually available for removal and that the relative activity of fission gases is very small when compared to 220Rn. The measurement data were then used to evaluate th expected effectiveness of a proposed charcoal adsorption bed consisting of a right circular cylinder having a diameter of 43 cm and a length of 91 cm (17 in. I.D. x 3 ft.). The majority of the measurement data predicts an overall 220Rn activity reduction factor of about 1 x 10(sup9) for such a design; however, two measurements collected at a flow velocity of 18 cm s(sup-1) (35 ft min(sup-1)) indicated that the reduction factor could be as low as 1 x 10(sup6). The adosorptive capacity of the proposed trap was also evaluated to determine th eexpected life prior to degradation of performance. Taking a conservative vantage point during analysis, it was estimated that the adsorption effectiveness should not begin to deteriorate until a 220Rn activity on the order of 10(sup10) Ci has been processed. It was therefore concluded that degradation of performance would likely occur as the result of causes other than filling by radon progeny.

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