| 摘要 |
A remotely controlled apparatus ( 112 ) for inspecting the core ( 102 ) and annulus ( 104 ) areas of nuclear boiling water reactors ( 100 ) includes a circumferential drive mechanism for propelling the apparatus ( 112 ) on the steam dam ( 108 ) of the reactor ( 100 ). The inspection apparatus ( 112 ) uses a set of driver rollers ( 314 ) that grip the side of the steam dam ( 108 ) and provide propulsion for the apparatus. A pinch-roller assembly with high-tension springs ( 308 ) and pneumatic air cylinders ( 310 ) is utilized for removably securing a set of pinch rollers ( 312 ) to the side of the steam dam opposite the side of the driver rollers ( 314 ). A set of rollers ( 304 ) are adapted to rest on top of the steam dam ( 108 ), supporting the weight of the apparatus ( 112 ) and enabling the apparatus to move around the steam dam ( 108 ). Two positioning guide rails ( 306 ) aid in the balance of the apparatus ( 112 ), especially when it is stationary. The apparatus ( 112 ) has a watertight main body ( 202 ), which houses the electrical control wiring and circuitry. The main body ( 202 ) has a front camera ( 204 ) and a rear camera ( 205 ) used to direct the movements of the apparatus ( 112 ). The main body also has two turret-type telescoping mast assemblies ( 208 ) with telescoping masts 210 and 212 , which are capable of extending at a selected distance above and below the main body ( 202 ). The mast assemblies 210 and 212 support inspection equipment such as radiation-shielded EVT-1-capable video cameras and radiation-tolerant fiberscopes. The apparatus ( 112 ) and its inspection tools are remotely controlled via control consoles with video monitors from a low-dose, non-contaminated enclosure located remotely from a boiling water reactor.
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