Patent Number: 043127070
Section: claims

1. A nuclear fuel rod, which comprises: a cladding tube filled with an insert gas or liquid metal and sealed at both ends in airtightness; and  a plurality of nuclear fuel pellets piled one atop another in the cladding tube, wherein an adsorbent carrying a tag gas for monitoring a nuclear fuel rod failure is received in the inner space of the cladding tube defined at least above or below the nuclear fuel pellet pile whereby said gas or liquid metal is released from said adsorbent when the temperature thereof increases. 2. The nuclear fuel rod according to claim 1, wherein the adsorbent is one selected from the group consisting of active carbon, Molecular Sieves, silica gel and active alumina. 3. The nuclear fuel rod according to claim 1, wherein the adsorbent is active carbon. 4. The nuclear fuel rod according to claim 1, wherein the adsorbent is received in a container. 5. The nuclear fuel rod according to claim 3, wherein the container is formed of one selected from the group consisting of stainless steel, copper and alumina and perforated at the top. 6. The nuclear fuel rod according to claim 4, wherein a disc for supporting the adsorbent container which is perforated at the center is set in the inner space of the cladding tube defined above the nuclear fuel pellet pile; and the adsorbent container is placed in a chamber provided above the support disc. 7. The nuclear fuel rod according to claim 1, wherein the tag gas is at least one of noble gas selected from the group consisting of neon, xenon, and krypton. 8. The nuclear fuel rod according to claim 3, wherein the container is formed of one selected from the group consisting of stainless steel, copper and alumina and open at the top.