Reactor coolant pump having improved dynamic secondary seal assembly.

摘要

A pump has a pair of seal parts (80,84) which are arranged to undergo axial translatory motion and a seal assembly (109) associated with the seal parts (80,84). The seal assembly (109) includes an annular liner (112) disposed within a groove (94) in one seal part (80) and projecting therefrom toward a cylindrical surface (93) of the other seal part (84), and a flexibly resilient annular O-ring (110) disposed within the groove (94) between the cylindrical surface (93) of the other seal part (84) and a surface (108) of the liner (112) which extends generally parallel to the cylindrical surface of the other seal part. The O-ring (110) is seatable on a radial surface (112B) of the annular liner (112) and projects from the groove (94) farther across a gap (122) between the seal parts (80,84) than the liner (112) and into contact with the cylindrical surface (93) of the other seal part (84) such that the O-ring is capable of rolling on the cylindrical surface (93) of the other seal part (84) and slipping on the radial surface (112B) of the annular liner (112) upon translatory movement of the seal parts (80,84) relative to one another. <IMAGE>