空気浄化システムによる福島第一原子力発電所の建屋および原子炉格納容器の負圧管理

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  • Development of Sub-atmospheric Pressure Control system using the high efficiency multi-nuclide aerosol filters for radiation protection during a process of cutting core debris for Metal Fiber Filter

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By using the FCVS technology, we had started to develop a high decontamination air cleaning system to remove multi-nuclides for radiation protection to conduct decommissioning the Fukushima NPP. High efficiency multi-nuclide aerosol filters for radiation protection during a process of cutting core debris has been developed at Hokkaido University. A plasma cutter, laser cutter, wire cutter, drilling machine, etc., will be used and will generate aerosols. Therefore, the air cleaning system should be needed for removing core debris. In order to develop an air clean up system, a metal fiver filter test was conducted. Measured DF were analyzed using FE-SEM and particle diameter analyzer was used to breakdown DF for each diameter range, it is possible to develop the high efficiency filters by multi-layer filters. Integral filter system will be consisted, such as a wet-type aerosol filter, multi-stage metal fiber filters and a silver zeolite to remove organic iodine. In order to develop an air clean up system, a metal fiver filter test was conducted. Measured DF were analyzed using FE-SEM and particle diameter analyzer was used to breakdown DF for each diameter range. Integral filter system was designed, by using the wet-type aerosol filter, multi-stage metal fiber filters to maintain the PCV or Reactor buildings. This paper describes the results of improvement of metal fiber filter for and total system test.

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