Patent Number: 
Section: claims

1. A securing device for installation on an outer circumferential surface of a nuclear reactor core shroud and in contact with an inner circumferential surface of a nuclear reactor pressure vessel, the securing device comprising:a base configured for contacting the outer circumferential surface of the nuclear reactor core shroud; anda radial extender including an actuator, a stationary support section fixed to the base and a movable contact section, the radial extender being configured such that the movable contact section is movable along the stationary support section by the actuator to force the movable contact section radially into the inner circumferential surface of the pressure vessel,wherein the radial extender is configured such that an axial movement of the actuator moves the movable contact section radially,wherein the movable contact section includes an elongated hole formed therein, the actuator being radially movable in the elongated hole as the actuator moves the movable contact section radially. 2. The securing device as recited in claim 1 further comprising a plurality of fasteners for passing through the base into the nuclear reactor core shroud. 3. The securing device as recited in claim 1 wherein the stationary support section includes an axially extending hole formed therein, the actuator being movable in the axially extending hole to move the movable contact section radially. 4. The securing device as recited in claim 1 wherein the actuator is a bolt extending through the movable contact section and through the stationary support section. 5. The securing device as recited in claim 1 wherein the base includes a first radial contact section having a contact surface configured for radially contacting a first outer circumferential surface section of the nuclear reactor core shroud and a second radial contact section having a contact surface configured for radially contacting a second outer circumferential surface section of the nuclear reactor core shroud, the first radial contact section being radially offset from the second radial contact section. 6. The securing device as recited in claim 1 wherein the stationary support section and the movable contact section are connected together by the actuator. 7. The securing device as recited in claim 1 wherein the stationary support section includes a first wedge part and the movable contact section includes a second wedge part, the first wedge part being slidable along the second wedge part by the actuator to force the movable contact section radially into the inner circumferential surface of the pressure vessel. 8. The securing device as recited in claim 7 wherein the first wedge part includes a first sloped surface and the second wedge part includes a second sloped surface that is complementary to the first sloped surface. 9. A method for installing a securing device on an outer circumferential surface of a nuclear reactor core shroud and in contact with an inner circumferential surface of a pressure vessel, the method comprising:fixing a base of the securing device to outer circumferential surface of the nuclear reactor core shroud; andmoving an actuator of the securing device to force a movable contact section of the securing device along a stationary support section of the securing device to force the movable contact section radially into the inner circumferential surface of the pressure vessel,wherein the movable contact section includes an elongated hole therein, the moving of the actuator including moving the actuator radially within the elongated hole. 10. The method as recited in claim 9 wherein the fixing of the base to the outer circumferential surface of the nuclear reactor core shroud includes machining blind holes into the shroud and installing fasteners through the base and into the blind holes. 11. The method as recited in claim 9 wherein the stationary support section includes a first wedge part and the movable contact section includes a second wedge part, the moving of the actuator including sliding the second wedge part along the first wedge part via the actuator. 12. The method as recited in claim 9 wherein the stationary support section includes an axially extending hole, the moving of the actuator including moving the actuator axially within the axially extending hole. 13. A securing device for installation on an outer circumferential surface of a nuclear reactor core shroud and in contact with an inner circumferential surface of a nuclear reactor pressure vessel, the securing device comprising:a base configured for contacting the outer circumferential surface of the nuclear reactor core shroud; anda radial extender including an actuator, a stationary support section fixed to the base and a movable contact section, the radial extender being configured such that the movable contact section is movable along the stationary support section by the actuator to force the movable contact section radially into the inner circumferential surface of the pressure vessel,wherein the stationary support section includes a first wedge part and the movable contact section includes a second wedge part, the first wedge part being slidable along the second wedge part by the actuator to force the movable contact section radially into the inner circumferential surface of the pressure vessel. 14. The securing device as recited in claim 13 wherein the first wedge part includes a first sloped surface and the second wedge part includes a second sloped surface that is complementary to the first sloped surface.