G - Physics – 21 – C
Patent
G - Physics
21
C
359/19, 26/196,
G21C 17/00 (2006.01) G01N 29/04 (2006.01) G21C 17/007 (2006.01)
Patent
CA 1189641
ABSTRACT OF THE DISCLOSURE: A rail apparatus for running an automatic ultrasonic flaw detector around a reactor pressure vessel for detecting any flaw in the weld beads on the reactor pressure vessel. At least two circumferential rails and vertical rails are connected through turn tables at their crossing points to form a rail unit The rail unit has vertical rails extending upward from the uppermost circumferential rail. The vertical rails are secured to a gamma shield, so that the rail unit as a whole is suspended from the gamma shield by means of these vertical rails. the rail unit is provided with swing prevention devices for preventing swing thereof. In installation of the rail apparatus, the rail unit is temporarily mounted on the reactor pressure vessel before mounting the latter in a containment vessel. Then, after accurately placing the reactor pressure vessel together with the rail unit in a right place within the contain- ment vessel, the rail unit is supported suitably by the gamma shield.
413790
Fujimoto Hirotsugu
Kimura Hiroshi
Naruse Akisuke
Takaku Kazuo
Gowling Lafleur Henderson Llp
Hitachi Ltd.
Hitachi Engineering Co. Ltd.
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