Reactor coolant pump having double dam seal with self-contained injection pump mechanism

摘要: A double dam seal (42) in a reactor coolant pump (14) includes an internal mechanism the to pressurize its annulus. In one form, is an inclined flow passage (92) incorporated rotating runner (48) of having outlet (94) communication with annulus (80) and inlet (96) water flow within housing (30) and being located on smaller radius rotation that passage (94). Rotation causes rotational movement any therein, turning rotating into centrifugal pump, causing pressure differential along due centrifugal effects, feeding via outlet at pressure above the (96). another tube (104) projecting angle from (46), or a recessed scoop (106) defined to, communicating (98) having (102) (100) generally same rotation. The are also rotation but extend upstream (102). Rotational tube through seal develops higher inlet than which, turn, supplied by (42).