Patent Number: 055442064
Section: description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention is described with reference to the enclosed Figures wherein the same numbers are utilized where applicable. Referring to FIGS. 1, 8, 9 and 10 perspective views of the nuclear reactor work station of the present invention are shown. The present invention, in one embodiment is intended to be situated, for example, atop a nuclear reactor head 13. As shown in FIG. 10, a nuclear reactor typically contains a plurality of vertically oriented rods 11 which are used to generate superheated or primary water which is then quenched by a secondary water source to produce steam. The reactor head 13 forms a flat bed 13a, and has a circular circumference 13b. The dome 17 of the containment vessel surrounds the reactor and reactor head. As shown in FIGS. 1, 2 and 8, the reactor work station 10, in a first embodiment, comprises a boom member 12 which is of sufficient length to extend at least the radius of the reactor head. It is to be appreciated that the boom member 12 may have a length of up to and including the diameter of the reactor head itself. The boom member 12 rests substantially horizontally upon a rotational pivot point 14 which is supported upon a base 15 situated, for example, on the reactor head 13. Base 15 may comprise a structure-having two horizontal supports 19,19a separated by vertical rods 21. Base 15 encases an electric motor 23 which is in communication with rotational pivot point 14 off the boom member 12. The rotational pivot point 14 enables the boom member 12 to rotate in a substantially horizontal direction with respect to the pivot point 14 via electric motor 23. In a preferred embodiment, the rotational pivot point 14 enables the boom member 12 to rotate a full 360 degrees. Electric motor 23 can comprise a servo, stepper or synchronous AC or DC motor. As shown in FIGS. 6, 7 and 10, the inspection device of the present invention is utilized in association with a control mechanism with CRT display 22. Such a control mechanism 22 is disclosed, for example, in U.S. Ser. No. 07/929,886, filed Aug. 11, 1992 entitled "Transportable Device And Method For Receiving And Displaying An Electrically Collected And Transmitted Image Of A Defined Environment", which is incorporated herein by reference as if set forth in full. The control mechanism 22 in one embodiment includes a control button panel 24 which facilitates the full control of the inspection device 10 and its electric motors to be disclosed herein. The control mechanism with CRT display 22 is attached to the system via control wires 54. It is to be appreciated that a remote control system is contemplated by the present invention. Referring to FIGS. 3 and 3A, first end 12a of the boom member 12 is supported by a roller assembly 36 comprising a caster or wheel 39 which is held in position by a vertical brace or support member 37. The caster or wheel 36 permits the boom member 12 to be rotated along the top of the reactor head 13 a full 360.degree.. As shown in FIGS. 3 through 5, the roller, caster or wheel 36 may comprise a dual axle roller 38, i.e., two rollers 39 separated and affixed to a horizontal bed 40. The vertical support members 37 of the present invention may comprise telescoping members 43, 43a supported by air pressure or by a biasing spring. The use of telescoping members 43, 43a facilitates the smooth operation and rotation of the pivoting boom member 12. As shown in FIGS. 1, 4, 5 and 9, a key feature of the present invention is the inclusion of a camera and light assembly 25 which is used to inspect the entire reactor and reactor head and which can be selectively moved and positioned into in a multitude of positions. The camera and light assembly 25 of the present invention may take a variety of forms and may include a CCD or video camera with halogen lamp. The camera and light assembly 25 can slide along the boom member 12 and be rotated in both the horizontal and vertical directions, in accordance with the system to be described herein. As shown in FIG. 2, the present invention comprises means 27 for sliding the camera and light assembly 25 along the boom member 12 in a longitudinal direction. In a preferred embodiment, means 27 comprises a drive screw 30 which extends longitudinally along a recess 12d within the boom member 12, and which is rotatable by means of a second electric motor 32 which is situated at the second end 12b of the boom member 12. Camera and light assembly 25 are supported on a chassis 35 which is in threaded engagement with the drive screw 30 via a support plate 41. The drive screw 30 is powered by second electric motor 32 which rotates the screw in both the clockwise and counter clockwise directions. It is to be appreciated that other means, such as a chain and pulley arrangement may be used to slide the camera and light assembly along the boom member 12. In operation, as shown in FIG. 9, when the drive screw 30 is rotated in a first direction, the camera and light assembly 25 on chassis 35 and support plate 41 of the present invention slide along the drive screw 30 in a first longitudinal direction with respect to the boom member 12 as shown by arrow A. When the drive screw is rotated in a second direction, the light and camera assembly 25 slide along the drive screw 30 in a second direction with respect to the beam member 12 as shown by Arrow B. The camera and light assembly 25 can thereby move along the entire length of the beam member 12 and in this way can scan the entire length of the reactor head. Referring to FIGS. 4, 5 and 8, the camera and lighting assembly 25 of the present invention are shown and disclosed in greater detail. A key feature of the present invention is the provision of means to selectively rotate and position the camera and light assembly in both the vertical and horizontal directions. In a preferred embodiment, the means comprises two perpendicularly disposed AC or DC stepper, synchronous or servomotors 46, 48 which can rotate the camera and light assembly 25. The motors 46, 48 are connected to the support plate by a hood 50 which position the motors 46, 48 at right angles with respect to each other. Motor 46, as shown in FIGS. 4 and 5, and most particular,, Arrow D controls the vertical rotation of the camera and light assembly. As shown in FIG. 8, motor 48 controls the horizontal rotation of the camera and light assembly as shown in Arrow E. As shown, in a camera and light assembly 25, the assembly comprises a CCD or video camera 51 coupled to a halogen lamp 53. Electric motor 46 is affixed to the camera and light assembly and facilitates the vertical rotational tilting of the camera and the lamp. Electric motor 48 facilitates the horizontal adjustment and pivoting of the video camera and halogen lamp 32 with respect to the boom member. As shown in FIG. 8, the reactor inspection system of the present invention is shown rotating horizontally with respect to the central pivot point 14. The system thus provides a complete 360 degree arc of rotation. The operation of the present invention is now described with reference to the Figures. The inspection device of the present invention is initially set up as shown in FIGS. 1 and 9 on its base 15 on a surface to be inspected. The system, in the preferred embodiment, comprises the camera and light assembly 25 attached to a boom member 12, a drive screw for sliding the camera and light assembly 25 and motors 23, 32, 46, 48 for rotating the boom member, drive screw 30 and the camera and light assembly 25 in both a horizontal and vertical direction under the control of an external control module 22. The first electric motor 32 rotates the boom member 12 with respect to the pivot point. The second motor 32 rotates the drive screw 30 so as to axially slide the camera and light assembly 25 along the boom member 14. The third and fourth motors 46, 48, as shown in FIGS. 4, 5 and 8, are utilized to horizontally and vertically rotate the camera and light assembly 25. Power and control wire 54 from the four motors as well as the camera and light assembly 25 are attached to an external control system with CRT monitor 22 with control button panel 24. In this respect, the camera and light assembly 25 can be fully rotated and horizontally and vertically positioned as required, thus permitting the full visual inspection of the critical areas to be inspected. In particular, the present invention can be used for the inspection of the CRDM (Control Rod Drive Mechanism) penetrations, the thermal sleeves, funnels and the annulus between CRDM penetrations and the thermal sleeves in a nuclear reactor. The present invention has been described with reference to the above-described preferred embodiment. It is to be appreciated that other embodiments fulfill the spirit and scope of the present invention and that the true nature and scope of the present invention is to be determined with reference to the claims appended hereto.