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PNC TN9410 94-052, 251 Pages, 1994/01
The structure of the pressure tube rolled joint portion for the ATR Demonstration Reactor is somewhat changed from that for Fugen, in order reduce the residual stress around the portion. Therefore, Constant Temperature Endurance Test and Thermal Cycle Endurance Test have been conducted under the reactor operating conditions except irradiation to examine the rolled joint integrity. (1)Constant Temperature Endurance Test. In fiscal 1988, Constant Temperature Endurance Test have been performed in the Component Test Loop for 2,033 hours under the reactor operating conditions (pressure 75kg/cm
, temperature 280
C) for the JP-3 specimen (total testing period 4,033 hours) and the JP-4, JP-5 specimens (total testing period 9,533 hours). After the endurance test it was found by the helium leak test that the rolled joint tightness was maintained enough. Therefore, it was confirmed that the reduction of the residual atress at the rolled joint portion which occurred at the initial stage of the operation did not affect the rolled joint tightness. (2)Thermal Cycle Endurance Test. The helium leak test and the ultrasonic flaw detection test were performed before and after Thermal Cycle Endurance Test (the unmber of thermal cycle increaced from 60 times to 140 times in fisical 1988), of which results showed the integrity of the rolled joint tightness and no crack propagation near the rolled joint portion. Therefore, it was confirmed that 140 times thermal cycle which was the design value for the reactor life of 30 years did not affect the rolled joint tightness and the initiation and propagation of a crack even for the specimen with 200 ppm hydrogen.
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PNC TN9410 86-129, 77 Pages, 1986/12
It is necessary for detecting and characterizing the defects with ultrasonic non-destructive testing to know the characteristics of the sound field and the pulse waveform transmitted by a ultrasonic probe. As a visual measuring technique relating the ultrasonic pulse waveform and sound pressure field generated by the probe, schlieren method for the wave in water and photo-elastic method for the wave in solid were used separately. Since there is a difficulty to observe simultaneously the sound field in the water and the solid by each method respectively, various types of the probe, such as a immersion type probe which is widly used in ultrasonic testing, cannot by evaluated and authorized the overall performance of the probe. To remove this difficulty, we have developed the polarized light schlieren method, which is combined the schlieren method with the photo-elastic method, for the visualization of ultrasonic pulses in both water and solid simultaneously. Following the principle of the polarized light schlieren method, we have made the visual test equipment having two concave mirrors, a polarizer and a knife edge made by polarizer film. Using this equipment, we have examined the performance and the possibility of the quantitative measurement of ultrasonic wave from the visual images. travelling directivity, frequency and wave mode of ultrasonic wave by using the polarized light schlieren method. In the future, we intend to improve the performance of our equipment and visualize the various ultrasonic wave behavior, especially liquid and solid interface. From the test results of this equipment, it is confirmed that ultrasonic wave in both water and transparent solid model, made by pyrex glass, is visualized simultaneously through the window of the water tank, and it is suggested that it can be evaluated quantitatively the sound pressure field.
JRR-2 Control Office; Kambara, Toyozo; Shoda, Katsuhiko; Hirata, Yutaka; Shoji, Tsutomu; Kohayakawa, Toru; Morozumi, Minoru; Kambayashi, Yuichiro; Shitomi, Hajimu; Kokanezawa, Takashi; et al.
JAERI 1027, 57 Pages, 1962/09
no abstracts in English
JRR-2 Critical Experiments Group; Kambara, Toyozo; Shoda, Katsuhiko; Hirata, Yutaka; Shoji, Tsutomu; Kohayakawa, Toru; Morozumi, Minoru; Kambayashi, Yuichiro; Shitomi, Hajimu; Kokanezawa, Takashi; et al.
JAERI 1025, 62 Pages, 1962/03
no abstracts in English
