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Development of 100-kCi Tritium Transport Vessel
Seungwoo Paek,Min Soo Lee,Kwang-Rag Kim,Do-Hee Ahn,Kyu-Min Song,Soon-Hwan Sohn IEEE 2010 IEEE transactions on plasma science Vol.38 No.3
<P>In this paper, a tritium storage and transport vessel was designed and manufactured to use the tritium of Wolsong TRF for the tritium industry. Uranium and zirconium-cobalt (ZrCo) metals were selected for the tritium storage materials. The transport vessel was designed on the basis of Type-B transportation package standards. The vessel was composed of a steel drum, inner packing materials, and a storage bed. The safety of the transport vessel was evaluated by structural and thermal analyses.</P>
Seungwoo Paek,Chang-Hwa Lee,Sung-Jai Lee 한국방사성폐기물학회 2019 방사성폐기물학회지 Vol.17 No.3
파이로프로세싱의 전해환원공정에서 생산된 금속전환체의 조성은 전해정련공정 운전의 중요한 운전변수인 용융염 중 UCl3 의 농도변화에 영향을 미친다. 따라서, 본 연구에서는 금속전환체에 함유된 TRU와 RE 원소의 함량 및 금속전환체에 동반 되어 전해정련 전해조에 유입될 수 있는 Li2O 농도가 전해정련 전해조의 UCl3 농도 변화에 미치는 영향을 검토하였다. 금속 전환체의 TRU 원소와 RE 원소의 농도만을 고려하였을 때 전해정련 운전 batch 수 증가에 따라 UCl3 농도가 감소하였다. 전 해정련 1 campaign(20 batch)를 운전하기 위해서는 UCl3를 3회 이상 추가 보충해야 함을 알 수 있었다. 한편, 금속전환체에 동반되어 전해정련 전해조에 유입되는 Li2O의 유입량 증가에 따라 UCl3 농도 감소의 영향이 크게 나타났으며, 이에 따라 운전 가능 batch 수가 급격히 감소하게 되어 전해정련 운전에 중요한 운전 변수임을 보여주었다. 이러한 결과는 전해정련 운전 중 UCl3 농도 유지를 위해 금속전환체에 포함된 TRU 및 RE 원소뿐만 아니라 금속전환체에 동반되어 유입될 가능성이 있는 Li2O의 영향도 고려하여 전해정련 운전모드를 설정하여야 함을 보여주었다. The composition of the reduced fuel produced in the electrolytic reduction process of pyroprocessing affects the concentration change of UCl3, an important operating variable of the electrorefining process. In this study, we examined the concentration change of UCl3 in the electrorefiner according to the content of TRU and RE elements in the reduced fuel and the concentration of Li2O introduced in the electrorefiner accompanied with the reduced fuel. Considering only the TRU and RE elements, the concentration of UCl3 decreased with increasing the number of electrorefining operation batch. In order to operate one campaign (20 batches) of electrorefining process, it was found that additional injection of UCl3 should be conducted more than 3 times. On the other hand, the concentration of UCl3 in the electrorefiner changed significantly depending on the concentration of Li2O and, accordingly the number of operable electrorefining batches decreased rapidly, showing that the concentration of Li2O is an important operating variable in electrorefining. Therefore, the results of this study show that to maintain the concentration of UCl3 in the electrorefiner, the operation mode should be set by taking into account the effect of Li2O as well as the TRU and RE elements contained in the reduced fuel.
Reaction of Rare Earth Oxide From the Simfuel and Chlorination Reagents in LiCl-KCl Molten salt
Seungwoo Paek,Dalsung Yoon,Ju Ho Lee,Sang Kwon Lee,Chang Hwa Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
To estimate the removal efficiency of TRU and rare earth elements in an oxide spent fuel, basic dissolution experiments were performed for the reaction of rare earth elements from the prepared simfuel with chlorination reagents in LiCl-KCl molten salt. Based on the literature survey, NH4Cl, UCl3, and ZrCl4 were selected as chlorination reagent. CeO2 and Gd2O3 powders were mixed with uranium oxide as a representative material of rare earth elements. Simfuel pellets were prepared through molding and sintering processes, and mechanically pulverized to a powder form. The experiments for the reaction of the simfuel powder and chlorination reagents were carried out in a LiCl-KCl molten salt at 500°C. To observe the dissolution behavior of rare earth elements, molten salt samples were collected before and after the reactions, and concentration analysis was performed using ICP. After the reaction completed, the remaining oxide was washed with water and separated from the molten salt, and XRD was used for structural analysis. As a result of salt concentration analysis, the dissolution performance of rare earth elements was confirmed in the reaction experiments of all chlorination reagents. In an experiment using NH4Cl and ZrCl4, the uranium concentration in the molten salt was also measured. In other words, it seemed that not only rare elements but also uranium oxide, which is a main component of simfuel, was dissolved. Therefore, it is thought that the dissolution of rare earth elements is also possible due to the collapse of the uranium oxide structure of the solid powder and the reaction with the oxide of rare earth elements exposed to molten salt. As a result of analyzing the concentration changes of Simfuel before and after each reaction, there was little loss of uranium and rare earth elements (Ce/Gd) in the NH4Cl experiment, but a significant amount of rare earth elements were found to be reduced in the UCl3 experiment, and a large amount of rare earth elements were reduced in the ZrCl4 reaction.