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Nuclear Services / Engineering Services DB Cell-checking Device Background Description Westinghouse has provided DB circuit breakers to many nuclear plants, and has provided breaker support and maintenance. Less maintenance has been performed on plant switchgear, however, and over time cell degradation can occur. Westinghouse has designed the DB cell-checking device to help provide proper breaker-to-cell component engagement, main and secondary contact alignment, and breaker-to-cell rail interface of Class 1E nuclear safety-related and non-Class 1E circuit breakers. Benefits Use of the new cell-checking device quickly provides evidence of whether the cell structure needs maintenance or possible parts replacement. DB-50 cell checking device installed in cell DB-50 cell checking device Westinghouse Electric Company 1000 Westinghouse Drive Cranberry Township, PA 16066 www.westinghousenuclear.com May 2011 NS-ES-0205 ©2014 Westinghouse Electric Company LLC. All Rights Reserved Experience • Westinghouse has provided cell structure replacement parts as listed in DB Air Circuit Breaker and Cell Parts Listing. • Westinghouse, with its extensive nuclear power experience and access to the original Westinghouse nuclear plant design documents, has built new DB circuit breakers for several power plant operations. • Westinghouse retains the exclusive rights to the original design and qualification documentation associated with Westinghouse-designed plants. August 2014 NS-ES-0205