An apparatus for facilitating the change from moderatorbloecken.

摘要

1341055 Moderator structures BROWN BOVERI & CO Ltd 27 May 1971 [29 May 1970] 17399/71 Heading G6C The stacked moderator blocks of a nuclear reactor are provided with means for moving adjacent columns of the stacked blocks bodily away from a column to be removed, prior to the operation of the charging machine to remove the column, so as to separate the column to be removed from the adjacent columns. In the embodiment described, the moderator blocks 3 stand on core support tubes 6 which extend through the bottom shield 16 of the reactor pressure vessel. Each column of moderator blocks 3 is provided with a base-plate 11 which normally rests on a flange 17 connected to a core support tube 6. Pistons 12 are contained in the core support tubes 6, each being rotatable by means of mechanical gearing so that a peg 13 on the upper face of the piston can be turned to such a position that it will tilt the corresponding moderator column in the desired direction when the piston 12 is raised by means of a screw jack 14. Each piston 12 is coupled to a position indicator 15 which is connected via an hydraulic connection to the peripheral support system of the moderator. The peripheral support system is formed by a plurality of levers pivoted at their lower ends and adjustable horizontally at their upper ends by control mechanisms to allow for the tilting of the moderator columns. To provide accurate tilting and moderator removal, the drive rotating each piston 12 is also coupled to the peripheral support system so that the appropriate sector of the system responds to a given rotary position of the piston, i.e. of peg 13.