A study on the effect of material impurity concentration on radioactive waste levels for plans for decommissioning of nuclear power plant

Co and Eu impurities in the SSCs are nuclides that dominantly influence the neutron-induced radioactive inventory in metal and concrete radwastes (radioactive wastes) during NPP decommission. The impurity concentrations provided by NUREG/CR-3474 were used for the practical range of Co and Eu impurit...

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Bibliographic Details
Published in:	Nuclear engineering and technology Vol. 55; no. 7; pp. 2489 - 2497
Main Authors:	Cha, Gilyong, Lee, Minhye, Kim, Soonyoung, Kim, Minchul, Kim, Hyunmin
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-07-2023 Elsevier 한국원자력학회
Subjects:	Activation inventory Decommissioing plan Impurity Radwaste level 원자력공학 Decommissioing plan Activation inventory Impurity Radwaste level
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Summary:	Co and Eu impurities in the SSCs are nuclides that dominantly influence the neutron-induced radioactive inventory in metal and concrete radwastes (radioactive wastes) during NPP decommission. The impurity concentrations provided by NUREG/CR-3474 were used for the practical range of Co and Eu impurity concentrations to be applied to the code calculations. Metal structures near the core were evaluated to be ILW (intermediate-level waste) for the whole range of Co impurity concentration, so the boundary line between ILW and LLW (low-level waste) has no change for the whole concentration range provided by NUREG/CR-3474. Also, the boundary line between VLLW (very low-level waste) and CW (clearance waste) in the concrete shield could alter a little depending on the Eu impurity concentration within the range provided by NUREG/CR-3474. From this work, it is found that the concentration of material impurities of SSCs gives no critical impact on determining radwaste levels.
ISSN:	1738-5733 2234-358X
DOI:	10.1016/j.net.2023.04.001