Patent Number: 048658030
Section: claims

1. A pressurized gas discharge system for the safety containment of a nuclear reactor with a conduit structure connected to the containment and providing a communication path with the interior thereof and a filter structure including filter stages with serially arranged filter elements consisting of stainless steel fiber packs, comprising: (a) a plurality of modular conduit units sealingly flanged together in series and forming said conduit structure, each of said modular units having a side opening at least at one side thereof with flanges formed around each side opening,  (b) frame members provided with flanges at opposite ends thereof and mounted to said modular unit flanges and serially flanged together,  (c) stainless steel fiber packs disposed within said frame members and having circumferential edges disposed between the opposite flanges of adjacent frame members, said stainless steel fiber packs extending fully across the interior of the frame members and having their circumferential edges clamped between said flanges so as to have a thickness which is a fraction of the normal stainless steel fiber pack thickness, and  (d) U-shaped members circumferentially welded onto the inner face areas of the frame member flanges such that the legs of the U-shaped members project from said flange face and engage the circumferential edges of said stainless steel fiber packs thereby to provide a gas seal with said stainless steel fiber pack edges. 2. A pressurized gas discharge system according to claim 1, wherein a perforated metal plate extends across each of said frame members at one side of said fiber pack in abutment with said fiber pack and in radial alignment with one of the flange surfaces, wherein a stainless steel cloth is disposed on the other, curved side of said fiber pack, and wherein the circumferential edges of said steel cloth are also engaged between said flanges. 3. A pressurized gas discharge system according to claim 1, wherein said filter packs are so arranged that said curved filter side is the upstream filter end. 4. A pressurized gas discharge system according to claim 1, wherein the areas around the filter pack circumferential edges between said flanges is filled with a cast-in sealing compound.