| 摘要 |
Coupling apparatus and methods for replacing a core spray line downcomer pipe coupled to a shroud T-box are described. In one embodiment, the coupling apparatus includes a seal ring, a mating flange, a housing, at least one coupling bolt, at least one spherical washer, and at least one lateral pin. The thermal expansion coefficient of the coupling bolt is lower than the thermal expansion coefficient of the seal ring, mating flange, and housing. After extending the downcomer pipe into the housing, the seal ring is inserted into the opposite end of the housing adjacent the downcomer pipe. The seal ring is then seated on the mating flange seat. The two seats allow the downcomer pipe to be rotational misaligned with the coupling apparatus. The coupling bolts extend through the mating flange and the housing to rigidly secure the downcomer pipe to the coupling apparatus. Lateral pins extend through the housing and the downcomer pipe to provide vertical and torsional load transfer from the downcomer pipe to the coupling apparatus. In addition, the coupling apparatus includes a cylindrical pipe, an elbow, a draw bolt, an anchor plate, and a block. The elbow is configured to receive the T-box extending from the shroud. In one embodiment, the draw bolt bolts extend through the anchor plate, the T-box, the elbow, and the block to secure the coupling apparatus to the shroud.
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