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Report No.

Dust generation and transport behavior in the primary circuit of HTTR

Hamamoto, Shimpei ; Shimazaki, Yosuke ; Furusawa, Takayuki ; Nemoto, Takahiro; Inoi, Hiroyuki

Dust is to be limited in the primary circuit of the HTGRs with regard to the reactor operational stability and structural integrity of heat exchanger because the dust in the coolant adhere the heat transfer pipe surface, and it is lowered with the performance of the heat exchanger. Furthermore the dust including the FPs which adhered for the piping must be reduced in order to discharge in the depressurization accident with coolant helium. In HTTR, The differential pressure of primary HGC rose with the increase in operating time of the HGC, and it had to exchange the filter in about every 8400 hours. Therefore, the source of the dust should be investigated using The Scanning Electron Microscope and The X-ray Fluorescence analyzer. As a result of their analysis, it was clarified that the source of dust is the slide member of the compressor which is not of a primary cooling system.



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