Development of a Filtered Containment Venting System for Nuclear Power Plants

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  • KAWAMURA Shinichi
    Nuclear Asset Management Department, Tokyo Electric Power Company
  • KIMURA Takeo
    Nuclear Asset Management Department, Tokyo Electric Power Company
  • OMORI Shuichi
    Research and Development Center, Tokyo Electric Power Company
  • NARABAYASHI Tadashi
    Division of Energy and Environmental Systems, Graduate School of Engineering, Hokkaido University

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Other Title
  • 原子炉格納容器フィルタベントシステムの開発
  • ゲンシロ カクノウ ヨウキ フィルタベント システム ノ カイハツ

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Abstract

A filtered containment venting system was developed for nuclear power plants. In the Fukushima Dai-ichi Nuclear Accident, widespread land contamination was caused by cesium-137. This system was developed to filter aerosol particles and reduce the amount of radioactive particle release, while protecting the primary containment vessel from over pressure by venting gas from the vessel. Performance tests were conducted under various vent gas flow rate conditions to ascertain decontamination factors for aerosol particles with various diameters. It was observed through the tests that aerodynamic diameter was a good index for characterizing various aerosol particles for the filtered containment venting system. Test results showed that the decontamination factors were well over 1,000 for aerosol particles with aerodynamic diameters larger than 0.4 μm. For aerosol particles with aerodynamic diameters larger than 0.2 μm, the decontamination factors significantly increased with the diameter. This suggested that inertial deposition was the governing mechanism for filtering aerosols in this system. The decontamination factor of the water scrubber section of the filter increased with the increase in Stokes number.

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