Study on Laser Beam Welding Technology for Nuclear Power Plants

Chida, Itaru; Shiihara, Katsunori; Fukuda, Tsuguo; Kono, Wataru; Obata, Masaaki; Morishima, Yasuo

doi:10.1299/kikaib.78.445

Cited by 1 publication

(1 citation statement)

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“…As a part of maintenance methods for the RV and reactor internals, laser peening and underwater laser beam welding techniques to prevent and repair from the SCC have been developed [8][9][10][11]. These inspection and maintenance techniques can contribute to shorten their work period, including the initial set-up because it is possible to work underwater without draining the reactor coolant.…”

Section: Introductionmentioning

confidence: 99%

Eddy current testing system for bottom mounted instrumentation welds

Kobayashi

Ueno

Suganuma

et al. 2015

EPJ Nuclear Sci. Technol.

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Abstract. The capability of eddy current testing (ECT) for the bottom mounted instrumentation (BMI) weld area of reactor vessel in a pressurized water reactor was demonstrated by the developed ECT system and procedure. It is difficult to position and move the probe on the BMI weld area because the area has complexly curved surfaces. The space coordinates and the normal vectors at the scanning points were calculated as the scanning trajectory of probe based on the measured results of surface shape on the BMI mock-up. The multi-axis robot was used to move the probe on the mock-up. Each motion-axis position of the robot corresponding to each scanning point was calculated by the inverse kinematic algorithm. In the mock-up test, the probe was properly contacted with most of the weld surfaces. The artificial stress corrosion cracking of approximately 6 mm in length and the electrical-discharge machining slit of 0.5 mm in length, 1 mm in depth and 0.2 mm in width given on the weld surface were detected. From the probe output voltage, it was estimated that the average probe tilt angle on the surface under scanning was 2.6°.

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Section: Introductionmentioning

confidence: 99%