| 摘要 |
This apparatus makes it possible to inspect CRDM penetration tubes (70) with a thermal sleeve (120) in a nuclear reactor. It comprises a support body (200) to be placed in the sleeve, an expansible bladder (240) connected to the support body and intended to fix it to the sleeve, sensors (250/260) intended to detect damage in the tube and a rotator (340) connected to the support body for simultaneously rotating the support body, the bladder, the sensor and the sleeve in the tube in order to scan the tube radially. Similarly, a mechanism (350) is used for simultaneously translating all the elements in the tube in order to scan it axially. When the support body is moved in rotation and in translation, the sleeve is stationary with respect to the sensors and the material properties of the sleeve are therefore radially and axially invariant with respect to the sensors, which allows more accurate inspection of the tube. <IMAGE>
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