Title:
上部連結プレートのばね押えボルトを検査するための装置と方法
Document Type and Number:
Japanese Patent JP2004519658
Kind Code:
A
Abstract:
The invention is directed to an apparatus and method for inspecting spring hold down bolts of an upper tie plate of a fuel rod assembly in a nuclear reactor and includes an inspection fixture adapted to be aligned with the upper tie plate of the nuclear reactor fuel rod assembly for placement into a position for rapid and easy insitu inspection of the hold down bolts of the upper tie plate. The fixture is provided with a plurality of ultrasonic transducers which are positioned on the fixture so that when the fixture is placed into the inspection position each transducer will be located proximate to one of the hold down bolts for conducting effective ultrasonic scanning of the bolt while the bolt is in place. A multi-channel ultrasonic flaw detector is connected to each of the transducers for indicating whether there are any flaws in each of the hold down bolts when the fixture is placed into the inspection position and the ultrasonic transducers are activated. A further feature of the invention is the use of spherically focused transducers for focusing the sound field at the predetermined distance from the head of the bolt in order to facilitate proper scanning of the bolt shank and thread relief, thereby greatly increasing inspection sensitivity.
Inventors:
Maccleland, Richard G.
Bowen, Michael Day.
Bowen, Michael Day.
Application Number:
JP2002505975A
Publication Date:
July 02, 2004
Filing Date:
June 28, 2001
Export Citation:
Assignee:
Framatome ANP Inc.
International Classes:
G01N29/04; G01N29/24; G21C17/06; (IPC1-7): G01N29/10; G01N29/24
Attorney, Agent or Firm:
Takashi Ishida
Jun Tsuruta
Masaya Nishiyama
Higuchi Souji
Jun Tsuruta
Masaya Nishiyama
Higuchi Souji