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Report No.
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Development of inspection technique for future commercialized FBRs

not registered; Yamada, Fumiaki

To achieve the availability factor of the Light Water Reactors (LWRs) for the commercialized Fast Breeder reactors (FBRs) in the future, it is necessary to shorten the period inspection. For this purpose, it is important to develop to develop and to verify inspection techniques for the FBR in the state of filling with opaque liquid sodium. From this point of view, we have investigated the volumetric inspection technique for steam generator (SG) tube at high temperature and the under-sodium visual inspection technique as a part of feasibility study for future commercialized EBRs. The results are as follows: (1)Development of under-sodium Visual Inspection Technique. In order to verify the deterioration of the special resolution, the ability of visualization of ultrasonic wave sensor in an ideal environmental condition as in a reactor vessel have been evaluated by analytic method. As a result, the effects from the signal to noise (S/N) ratio of sensor elements and the angle between the sensor and the target are smaller, and that from the temperature fluctuation in the reactor vessel is bigger. Though ASME section IX rule requires to identify the English lower-case letters with size 2.7mm at the distance of 1.2m, the ultrasound technique used here is hardly to clearly read out the letters at frequency of 10MHz. Therefore, it is necessary to improve the spatial resolution. (2)Development of Volumetric Inspection Technique for Steam Generator Tubes at High Temperature. In order to verify the detectability for flaws, the sensor probes of bobbin ECT and remote field (R/F)-ECT which are composed of heat resistant material and parts have been fabricated. The flaws inspection for 12Cr steel tubes and 2$$cdot$$1/4Cr-1Mo steel tubes and the continuous heat-test for 12Cr steel tubes have been made. The S/N ratios are more than 8 from room temperature to 200$$^{circ}$$C, their detectability has been verified. The eontinuous heat resistance test for more than 100 hours at the temper

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