Patent Number: 052271277
Section: claims

1. A filtered venting system located in association with a reactor containment vessel installed in a reactor building comprising: a filter device disposed in the reactor building and including filter means;  a first venting line disposed on an upstream side of the filter device and having one end connected to the reactor containment vessel and another end connected to the filter device;  a stand-by gas treatment system connected to the first venting line, said stand-by gas treatment system including outlet drive means having a downstream side connected to the first venting line, inlet valve means, isolation valve means and check valve means; and  a second venting line disposed at a downstream side of the filter device and having an end connected to discharge means;  wherein said filter device is utilized as filtering means for the stand-by gas treatment system for treating and removing a radioactive substance in an atmosphere delivered from the reactor containment vessel. 2. A filtered venting system according to claim 1, wherein said outlet drive means is an outlet fan means. 3. A filtered venting system according to claim 1, wherein said filter means includes a water filter and a stainless fiber filter. 4. A filtered venting system according to claim 1, wherein an inert gas feed line is connected to the filter device. 5. A filtered venting system according to claim 4, wherein the inert gas is an N.sub.2 gas. 6. A filtered venting system according to claim 1, wherein isolation valve means, check valve means and rapture disk means are incorporated to the first venting line, and outlet valve means, rupture disk means and check valve means are incorporated to the second venting line. 7. A filtered venting system according to claim 1, wherein said outlet drive means is an outlet pump means.