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http://dx.doi.org/10.7733/jnfcwt.2018.16.4.441

Screening Assessment of Radiological Effect From Clearance of Decommissioning Concrete Waste Based Upon Recycling Framework of Construction Waste in Korea  

Lim, Kun-Su (Kyung Hee University)
Cheong, Jae Hak (Kyung Hee University)
Whang, Joo Ho (Kyung Hee University)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.16, no.4, 2018 , pp. 441-454 More about this Journal
Abstract
Since the permanent shutdown of Kori Unit 1 in 2017, a full-scale decommissioning project for a commercial nuclear reactor has been approaching. It is estimated that about 160,000 t of low-activity concrete waste will be produced from decommissioning of one unit of this commercial nuclear power reactor. Accordingly, it is necessary to review whether the effectiveness of the current regulatory framework for clearance waste (i.e. waste stream that meets activity concentration guidelines or dose criteria for clearance set forth in NSSC Notice No. 2017-65) can be maintained for the clearance of a bulk amount of concrete waste. In this regard, the IAEA SRS No. 44, which was used as a basis for revision of the Korean clearance regulations, is thoroughly analyzed and the radiological effects from four different clearance scenarios, along with input values and parameters derived from industrial practices in Korea, were evaluated. Though it is shown that the maximum annual dose from most recycling scenarios will be less than the clearance dose criterion for the normal scenario (i.e. an order of magnitude of $0.01mSv{\cdot}y^{-1}$), the radiation dose, estimated with conservative assumptions for the banking scenario, may exceed the above clearance dose criteria. Therefore, for safe and sustainable clearance of the bulk amount of concrete waste, it is required to diversify the concrete waste processors, perform more detailed site-specific assessment, and apply limiting conditions to the banking scenario.
Keywords
Clearance; Concrete waste; Decommissioning; Construction waste; Recycling;
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