Patent Number: 063209233
Section: claims

1. A locking device/for use in a nuclear reactor to restrain a jet pump downcomer comprising: a restraining ring;  a downcomer carried by the restraining ring;  a wedge supported by the restraining ring and the downcomer;  a guide bolt extending in an axial direction in relation to the  downcomer such that the wedge is movably supported by the guide bolt;  a locking device comprising:  a restraining ring;  a downcomer carried by the restraining ring;  a wedge supported by the restraining ring and the downcomer;  a guide bolt extending in an axial direction in relation to the downcomer such that the wedge is movably supported by the guide bolt; and  a locking device comprising:  wherein the means for inducing a compressive force against the upper jaw and the lower jaw is a tightening screw extending between the upper jaw and the lower jaw. 2. The locking device as defined in claim 1, wherein the wedge is interposed between the upper jaw and the lower jaw. 3. A locking device as defined in claim 1, wherein the guide bolt is carried by two guide blocks supported by the downcomer. 4. The locking device as defined in claim 1, wherein the guide blocks are welded to the downcomer. 5. The locking device as defined in claim 1, wherein one end of the upper jaw and a corresponding end of the lower jaw are moveably supported by the guide bolt. 6. The locking device as defined in claim 5, wherein the upper jaw includes a hook-shaped member at the distal end thereof. 7. The locking device as defined in claim 5, wherein the lower jaw includes a hook-shaped member at the distal end thereof. 8. The locking device as defined in claim 1, wherein the tightening screw is retained within a housing. 9. The locking device as defined in claim 8, wherein the housing defines a recess such that the lower surface of the recess is brought into contact with the restraining ring. 10. The locking device as defined in claim 1, wherein the locking device is fabricated of stainless steel. 11. A locking device for use in a nuclear reactor to restrain a jet pump downcomer comprising: