Abstract: Leakage producing faults in a guide tube of finite length are repaired by encapsulating the guide tube within a sleeve-like member which extends between a wall, from which the guide tube projects, and a housing which passes through the guide tube and extends beyond the end thereof. The sleeve-like member has resilient seals at the ends thereof, is pre-loaded to partially compress the seals and is shaped so that exposure thereof to a pressurized fluid will result in further compression of the seals.

Abstract: The position of a valve member is sensed by a transducer mounted on the exterior of the valve housing. The transducer is connected to a passive circuit located within an enclosure mounted on or adjacent to the valve housing. The passive circuit, when connected to a source of electrical power, provides a signal commensurate with the output of the transducer and an encoded signal which identifies the valve. The information contained in these signals is transmitted to a remote location, decoded and employed to determine the existance of a valve member position error.

Abstract: Reactor pressure vessel inspection apparatus which permits the non-destructive testing of the vessel lower head, shell and top flange taper areas without equipment modification. The inspection apparatus includes an articulated joint assembly which permits a transducer support arm to be rotated about three intersecting axes, the three axes defining two pair of transverse axes.

Abstract: An alignment system is provided for nuclear fuel assemblies in a nuclear core. The core support structure of the nuclear reactor includes upwardly pointing alignment pins arranged in a square grid and engage peripheral depressions formed in the lateral periphery of the lower ends of each of the fuel assemblies of the core. In a preferred embodiment, the depressions are located at the corners of the fuel assemblies so that each depression includes one-quarter of a cylindrical void. Accordingly, each fuel assembly is positioned and aligned by one-quarter of four separate alignment pins which engage the fuel assemblies at their lower exterior corners.