| 摘要 |
In a nuclear power reactor fuel bundle assembled by tie rods extending between the upper and lower tie plates, the upper tie plate is secured by pre-indexed locking cams which are adjustably fitted to the upper ends of the tie rods and which lock into seats machined into the body of the upper tie plate. During assembly of the fuel bundle, the cams are forced through internal passageways in the tie plate which rotate the cams into a position from which they may enter their respective seats, urged by torsion springs fitted onto the tie rods. Compression springs around the fuel rods hold the tie plate in position by maintaining the cams in their seats. The construction facilitates the disassembly of the fuel bundle for removal of defective or spent fuel rods and permit their replacement under remotely controlled conditions. |
