An aluminum gasket with a small volume added at one point has been developed and is recommended for sealing a leak in the HFIR HB-1 beam-tube flange. This type of gasket, in a symmetrical form, was originally tested and proposed in February, 1972. It has now been revised to fit a specific eroded area (found when the HFIR was disassembled for a scheduled major overhaul, after ten years of operation). The extent of erosion was evaluated from underwater television examinations of the flange faces, a test gasket impression, and plaster casts of the eroded area.nThe modified gasket consists of a ring made of 0.093-in.-diam wire with the normal contour increased to 1/8 in.2 in the section at the cavity region and oriented to place this section over the eroded area. Special tools and viewers are available for checking its position.
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