Abstract: Provided is an apparatus for fatigue testing a bulge tool having a WH-type skeleton, the apparatus including: a fixing bracket having tool holes penetrated through opposite sides thereof; a tool housing coupled to the tool hole of the fixing bracket and having the bulge tool inserted and installed therein; a moving rail installed at one side of the fixing bracket in a lengthwise direction of the tool housing and providing a reciprocating movement path facing the tool housing; a moving bracket reciprocating along the moving rail; a pusher protrudingly installed from the moving bracket toward the tool housing and moving in and out of the bulge tool; a measurement means installed between the pusher and the moving bracket, measuring a load applied to the bulge tool; and a drive means for generating power reciprocating the moving bracket on the moving rail.

Abstract: Proposed is an internal electrode insertion device for transferring the internal electrode to a welding position in order to weld a skeleton of a nuclear fuel assembly, the device including: a table; a plurality of internal electrode bars disposed in parallel in a plurality of rows on a top portion of the table; guide members provided on the table and configured to guide a horizontal movement of the internal electrode bars; guide rails provided in parallel with an alignment direction of the internal electrode bars on the top portion of the table; a driving unit provided with a servomotor thereon, thereby performing horizontal movement driving along the guide rails; and a control unit for controlling driving of the servomotor based on a preset position of each of the internal electrodes.

Abstract: Proposed is a light-water reactor nuclear fuel rod loading force measuring apparatus provided on a nuclear fuel rod loading apparatus, which comprises a spacer grid holder and a loading power device installed with a traction module configured to reciprocally move toward the spacer grid holder, the measuring apparatus including: a hollow cladding tube sample positioned on one side of a spacer grid and having the same diameter as a nuclear fuel rod cladding tube; a pulling bar having one end part passing through a cell of the spacer grid and coupled to the hollow cladding tube sample and an opposite end part coupled to the traction module; and a measuring means installed on the pulling bar and configured to measure force of the traction module loading the pulling bar.

Abstract: A nuclear fuel rod end distance adjusting device includes an insertion rod, a housing having a hollow space, insertion power means installed inside the housing, a connector connected between the insertion power means and the insertion rod, and an anti-rotation tool installed between the insertion power means and the connector. The insertion rod includes nuclear fuel rod tongs and configured to linearly move forward and backward. The insertion power means is configured to move in a longitudinal direction of the housing by converting a rotational motion into a linear motion. The anti-rotation tool is configured to move in the longitudinal direction of the housing by being interlocked with the linear motion of the insertion power means, but preventing rotational force of the insertion power means from being transmitted to the connector. Thereby, movement and end distance of the fuel rods can be more minutely and stably adjusted.

Abstract: Provided is an apparatus for fatigue testing a bulge tool having a WH-type skeleton, the apparatus including: a fixing bracket having tool holes penetrated through opposite sides thereof; a tool housing coupled to the tool hole of the fixing bracket and having the bulge tool inserted and installed therein; a moving rail installed at one side of the fixing bracket in a lengthwise direction of the tool housing and providing a reciprocating movement path facing the tool housing; a moving bracket reciprocating along the moving rail; a pusher protrudingly installed from the moving bracket toward the tool housing and moving in and out of the bulge tool; a measurement means installed between the pusher and the moving bracket, measuring a load applied to the bulge tool; and a drive means for generating power reciprocating the moving bracket on the moving rail.

Abstract: Provided is the nuclear fuel rod end distance adjusting device, the device allowing an adjustment of a nuclear fuel rod end distance to be stably and efficiently accomplished and including: an insertion rod including nuclear fuel rod tongs and linearly moving forward and backward; a housing having a hollow space; insertion power means installed inside the housing, and moving in a longitudinal direction of the housing by converting a rotational motion into a linear motion; a connector connected between the insertion power means and an insertion rod; and an anti-rotation tool installed between the insertion power means and the connector, being capable of moving in the longitudinal direction of the housing by being interlocked with the linear motion of the insertion power means, but preventing rotational force of the insertion power means from being transmitted to the connector.

Abstract: A spot welding device for a nuclear fuel skeleton, which is assembled by spot-welding guide tubes for control rods and a instrumentation tube for measuring a state of an inside of a nuclear reactor to a spacer grid that has a plurality of cells formed in a thickness direction of a plate-shaped frame for inserting fuel rods, has a instrumentation tube hole formed at a center, and has four guide tube holes formed symmetrically above and below the instrumentation tube hole. The device includes: a welding gun including: a body, a first holder and a second holder extending from a side of the body and having respective electrodes facing each other at ends, respectively, and a driving unit disposed on the body and adjusting a distance between the electrodes; and a robot connected to the welding gun and having a rotary joint for rotating the welding gun.

Abstract: A spot welding device for a nuclear fuel skeleton, which is assembled by spot-welding guide tubes for control rods and a instrumentation tube for measuring a state of an inside of a nuclear reactor to a spacer grid that has a plurality of cells formed in a thickness direction of a plate-shaped frame for inserting fuel rods, has a instrumentation tube hole formed at a center, and has four guide tube holes formed symmetrically above and below the instrumentation tube hole. The device includes: a welding gun including: a body, a first holder and a second holder extending from a side of the body and having respective electrodes facing each other at ends, respectively, and a driving unit disposed on the body and adjusting a distance between the electrodes; and a robot connected to the welding gun and having a rotary joint for rotating the welding gun.