7. 作業環境中におけるトリチウムの動態 (<小特集>核融合炉内外におけるトリチウムのメインテナンスと廃棄物処理)

概要

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The distributions and behavior of tritium in the working environment have been rarely reported so far. This paper describes tritium kinetics related to the leakage of heavy water in the containment building of the Kyoto University Research Reactor (KURR) which supports two major sources of tritium: a D_2O (heavy water) facility and a Cold Neutron Source (CNS) facility (liquid deuterium). Mathematical models were developed to predict both the changes in HTO concentrations in water pools and the emission of HTO soaked in the concrete material during the leakage event from the D_2O facility. After the remediation of the HTO contamination the cause of recent ingrowth of HTO concentration in the building air during venting cessation may be attributable due to the fact that the higher HTO concentration in condensates of than 2×10^5 Bq/cm^3 was found in the CNS exhaust stream, though the specific activities in condensates in the stack air is less than 1 Bq/cm^3 during venting operation.
2000-10-25