期刊
NUCLEAR ENGINEERING AND TECHNOLOGY
卷 53, 期 7, 页码 2261-2267出版社
KOREAN NUCLEAR SOC
DOI: 10.1016/j.net.2021.01.005
关键词
Waste immobilization; Radioactive concrete wastes; Waste acceptance criteria; Leachability index; Magnesium potassium phosphate cements (MKPCs)
资金
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT) [2017M2B2B1072405]
- National Research Foundation of Korea [2017M2B2B1072405] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study demonstrates that MKPCs can effectively immobilize radioactive concrete wastes generated by the decommissioning of nuclear power plants. The addition of simulated concrete powder wastes reduces porosity and increases compressive strength of MKPC specimens. MKPCs maintain satisfactory compressive strength and leachability indices after thermal cycling and immersion.
This paper evaluates the efficacy of magnesium potassium phosphate cements (MKPCs) as waste forms for the solidification of radioactive concrete powder wastes produced by the decommissioning of nuclear power plants. MKPC specimens that contained up to 50 wt% of simulated concrete powder wastes (SCPWs) were evaluated. We measured the porosity and compressive strength of the MKPC specimens, observing them using scanning electron microscopy and X-ray diffraction. The addition of SCPWs reduced the porosity and increased the compressive strength of the MKPC specimens. Struvite-K crystals were well-synthesized, and no additional crystal phase was formed. After thermal cycling and after immersion, MKPC specimens with 50 wt% SCPWs satisfied the waste-acceptance criteria (WAC) for compressive strength. Semi-dynamic leaching tests were performed using the ANS 16.1 method; the leachability indices of Cs, Co, and Sr were 11.45, 17.63, and 15.66, respectively, which also satisfy the WAC. Thus, MKPCs can provide stable matrices to immobilize radioactive concrete wastes generated by the decommissioning of nuclear power plants. (c) 2021 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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