| 摘要 |
A shipping container (28) is provided for a hexagonal nuclear fuel assembly (2) including a top nozzle (4) having a top end (11), an outer barrel (10), an external shoulder (14), and an inner barrel (12); a plurality of grids (16) which support fuel rods (6); and a bottom nozzle (8) having an internal shoulder within a recess (18), a spherical taper (22), and a bottom end. The container (28) may include a housing (30), a support (32) for the fuel assembly (2), a top nozzle holder (46) secured to the support (32), plural grid supports (56) secured to the support (32), plural clamping frames (58) for clamping the grids (16), plural guide plates (60) for guiding the fuel assembly (2) between adjacent grid supports (56), and a bottom nozzle holder (66) secured to the support (32). The top nozzle holder (46) may include a shoulder holder (50) for holding the external shoulder (14), an end holder (68) for enclosing and holding the top end (11), and a shoulder clamp for clamping the shoulder holder (50) to the support (32). The shoulder holder (50) may include a resilient split ring (102) for postioning around the inner barrel (12) and a resilient slip support (104) for encasing the resilient split ring (102). The grid supports (56) may each include two edges for supporting two sides of the grid (16), a base plate (124) for fixedly supporting the two wedges thereto, a bearing pad (126) fixedly mounted to the support for slidably supporting the base plate (124), and shoulder screws (128) for limiting a sliding motion of the base plate (124) on the bearing pad (126). The guide plates (60) may have a guide side and two surfaces for guiding the two sides of the grids. The guide plates (60) may further have an absorbing side having a coating of gadolinium oxide. The bottom nozzle holder (66) may include a recess holder (70) for holding the internal shoulder. The recess holder (70) may include a wedge mechanism (232) for wedging against the bottom nozzle (8) within the recess (18) and a moving mechanism (234) for moving the wedge mechanism (232) within the recess (18). The recess holder (70) may also include plural grippers (238) for gripping the internal shoulder and a cam mechanism for moving the grippers (238). |
