Patent Number: 041749995
Section: claims

1. Apparatus for locating an inspection device within a nuclear reactor vessel for volumetric examination thereof, the vessel having an external flange having located thereon a plurality of guide studs extending upwardly therefrom defining a generally circular path, an internal locating element the exact position of which is known and an internal circumferential flange, said apparatus comprising: (a) a support ring generally sized to relate to the path defined by the position of the guide studs;  (b) a plurality of guide stud bushings, equal in quantity to the number of guide studs, said bushings being larger in internal diameter than the outer diameter of the guide studs;  (c) first clamping means for movably mounting said bushings on said support ring to enable, when loosened, alignment of each of said bushings with one of said guide studs;  (d) at least three support legs, all but one of said support legs including means for adapting said legs to contact and rest upon the internal circumferential vessel flange, the remaining support leg including means for adapting said leg to engage the internal locating element; and  (e) second clamping means for mounting said support legs to said support ring at a point thereon which insures that the internal circumferential vessel flange and the internal locating element are simultaneously and respectively contacted and engaged. 2. The apparatus according to claim 1 wherein said support ring includes means for positively engaging said first and second clamping means in a predetermined alignment and said first and second clamping means include means for accepting said positive engagement with said support ring. 3. The apparatus according to claim 2 wherein said support ring means for positively engaging comprises an annular longitudinal key running about its periphery and said first and second clamping means for engagement comprises a keyway sized to accept said support ring key. 4. The apparatus according to claim 1 wherein said remaining support leg means for adapting includes a keyed plate mounted to said remaining leg when the core barrel of the reactor vessel remains in place. 5. The apparatus according to claim 1 wherein said remaining support leg means for adapting includes a locating key mounted to said remaining leg when the core barrel of the reactor vessel is removed. 6. The apparatus according to claim 2 wherein said remaining support leg means for adapting includes a keyed plate mounted to said remaining leg when the core barrel of the reactor vessel remains in place. 7. The apparatus according to claim 2 wherein said remaining support leg means for adapting includes a locating key mounted to said remaining leg when the core barrel of the reactor vessel is removed. 8. The apparatus according to claim 1 wherein said support legs include means for extending said legs radially with respect to said support ring. 9. The apparatus according to claim 1 wherein said first clamping means is adapted to clamp said guide stud bushings at varying radial distances from said support rings. 10. The apparatus according to claim 8 wherein said first clamping means is adapted to clamp said guide stud bushings at varying radial distances from said support rings. 11. The apparatus according to claim 2 wherein said support legs include means for extending said legs radially with respect to said support ring. 12. The apparatus according to claim 2 wherein said first clamping means is adapted to clamp said guide stud bushings at varying radial distances from said support rings. 13. The apparatus according to claim 12 wherein said first clamping means is adapted to clamp said guide stud bushings at varying radial distances from said support rings. 14. The apparatus according to claim 4 wherein said support legs include means for extending said legs radially with respect to said support ring. 15. The apparatus according to claim 4 wherein said first clamping means is adapted to clamp said guide stud bushings at varying radial distances from said support rings. 16. The apparatus according to claim 14 wherein said first clamping means is adapted to clamp said guide stud bushings at varying radial distances from said support rings. 17. The apparatus according to claim 5 wherein said support legs include means for extending said legs radially with respect to said support ring. 18. The apparatus according to claim 5 wherein said first clamping means is adapted to clamp said guide stud bushings at varying radial distances from said support rings. 19. The apparatus according to claim 17 wherein said first clamping means is adapted to clamp said guide stud bushings at varying radial distances from said support rings.