Radioactive Aerosol Control and Decontamination in the Decommissioning of the Fukushima Daiichi Nuclear Power Station

被引:10
作者
Sharma, Avadhesh Kumar [1 ]
Liang, Hui [2 ]
Xu, Ruicong [3 ]
Ozdemir, Erdal [1 ]
Miwa, Shuichiro [1 ,3 ]
Terabayashi, Ryohei [1 ]
Suzuki, Shunichi [3 ]
Pellegrini, Marco [1 ,3 ]
Hasegawa, Shuichi [1 ]
Erkan, Nejdet [4 ]
机构
[1] Univ Tokyo, Nucl Profess Sch, Grad Sch Engn, 2-22 Shirakata, Tokai, Ibaraki 3191188, Japan
[2] Harbin Engn Univ, Coll Nucl Sci & Technol, Harbin 150001, Peoples R China
[3] Univ Tokyo, Grad Sch Engn, Dept Nucl Engn & Management, 7-3-1 Hongo, Bunkyo Ku, Tokyo 1138656, Japan
[4] United Kingdom Atom Energy Author, Fus Technol Facil, Abingdon, England
关键词
Aerosol scavenging; laser cleaning; spray; decommissioning; nuclear power plant; ACOUSTIC AGGLOMERATION; EFFICIENCY;
D O I
10.1080/00295450.2023.2186675
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
The recent Nuclear Regulation Authority evaluation report suggests that at the Fukushima Daiichi Nuclear Power Station, the concrete shield plugs above the primary containment vessel (PCV) have exceptionally high radiation levels in Units 2 and 3, which may increase the risk of radiation exposure during decommissioning operations. During the cleaning and disassembly of such radiation hot spots, it is expected that a large amount of submicron-sized radioactive aerosol particles will be generated, which may influence the decommissioning operation. In the present study, laser cleaning experiments were conducted at the University of Tokyo Aerosol Removal Test Facility to simulate aerosol scavenging during the laser cleaning process. The facility can reproduce multiple phenomena expected in actual plant decommissioning, such as laser decontamination and simultaneous mist and spraying operations. Through the work, we have developed effective aerosol dispersion control methods and strategies based on the joint use of water mist and water spray to reduce radiation risk in either laser cutting or other means of decontamination methods. Preliminary laser cleaning experiments on various coated samples were conducted to assess the aerosol removal efficiency using water droplets and mist. It was verified that the proposed method effectively cleans the radiation hot spots during the decommissioning process.
引用
收藏
页码:2030 / 2043
页数:14
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