Patent Number: 
Section: claims

1. An apparatus for a nuclear fuel assembly, comprising:a top nozzle; andguide pins for aligning the top nozzle with an upper core plate of a nuclear reactor;wherein each of the guide pins has a guide hole axially formed therein,the guide holeextending from an upper end of a guide pin to an end of the guide pin located within a body of the top nozzle, andaligning with an aligning hole that extends through the body of the top nozzle and opens at a bottom surface of the top nozzle,the aligning hole, when the top nozzle is aligned with the upper core plate, being offset from a control rod assembly of the apparatus. 2. The apparatus of claim 1, wherein the aligning hole is formed at a corner of the top nozzle. 3. The apparatus of claim 1, further comprising a core instrument in the guide hole, and extending from the upper end of the guide pin through the end of the guide pin located within the body of the top nozzle into the aligning hole in the body of the top nozzle.