Abstract: An apparatus that visually inspects a state of sludge and foreign substances found between steam generator bundles positioned at an upper portion of a tube sheet of a steam generator of a nuclear power plant using a visual inspector mounted in a robot moving on an inner wall surface of the steam generator for removing the foreign substances.
Type:
Grant
Filed:
July 18, 2008
Date of Patent:
April 16, 2013
Assignee:
Korea Plant Service & Engineering Co., Ltd.
Inventors:
Gyung-Sub Kim, Sang-Hoon Choi, Dong-Il Kim
Abstract: A method of controlling stress in a boiler pressure vessel comprises limiting the diameter of a drum (10) of the boiler pressure vessel and preheating at least a portion of the wall (12) of the drum (10). Limiting the diameter of the drum (10) allows pressure in the drum (10) to be increased for a given mechanical stress. Furthermore, preheating the wall (12) of the drum (10) reduces peak thermally induced stresses in a material from which the drum (10) is fabricated.
Type:
Application
Filed:
January 20, 2010
Publication date:
July 21, 2011
Inventors:
Donald W. Bairley, Wesley P. Bauver, II, Francois Droux, Ian J. Perrin, Christoph Ruchti, Falk Ruecker, Glenn T. Selby
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