Part 21 Report - 1996-831

ACCESSION #: 9612200120 C&D Charter Power Systems. Inc. Washington and Cherry Streets Technology Conshohocken, Pennsylvania 19428 Telephone: 610 825-2150 Fax: 610 832-0252 18 December 1996 Document Control Desk Nuclear Regulatory Commission Washington, DC 20555 Fax 301-816-5151 Dear Sirs; Based upon analysis of a charger returned by PSE&G (ARR130H300F, Spec S04357X7, Serial LPS954288) the welds on the weld nut holding the Filter Assembly Panel are not to specification and may not hold under seismic stress. Failure of the weld or weld nut could allow the Filter Assembly Panel to break lose under seismic stress and cause damage to other components in the charger and the loss of DC output. Similar chargers have been delivered to; PSE&G Hancocks Bridge, NJ Serial numbers LPS954285, LPS954286, LPS954287, LPS954288, LPS954289, LPS954290, LPS954291, LPS954292, LPS954293, LPS954294, LPS954295, LPS954296 Northern States Power Prairie Island Site Welch, MN Serial Numbers BPS955482-84, KPS944882-4930 Both PSE&G and Northern States Power will be advised of this notification by copy of this letter. We will follow-up within 30 days with written procedures to identify the weld nuts and possible defects within the welds as well as repair procedures if a defect is identified. Sincerely, Dr. L. S. Holden VP Technology, C&D Charter Power Systems, Inc Chairman, Product Safety Committee Cc: Paul Hellen, Northern States Power, 1717 Wakonade Drive East, Welch, MN Principal Engineer, Supplier Assessment, Public Service Electric and Gas, NBU W-04, PO Box 236, Hancocks Bridge, NJ 08038 Product Safety Committee, G. Walker, M. Mentgen, J. Boston file: QA7312 file: Product Safety Committee GENERAL INFORMATION or OTHER EVENT NUMBER: 31471 LICENSEE: C&D CHARTER POWER SYSTEMS NOTIFICATION DATE: 12/18/96 CITY: CONSHOHOCKEN REGION: 1 NOTIFICATION TIME: 07:50 [ET] COUNTY: STATE: PA EVENT DATE: 12/18/96 LICENSE#: AGREEMENT: N EVENT TIME: 00:00[EST] DOCKET: LAST UPDATE DATE: 12/18/96 NOTIFICATIONS NRC NOTIFIED BY: DR. L.S. HOLDEN (VIA FAX) HQ OPS OFFICER: STEVE SANDIN EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH EVENT TEXT C&D POWER SYSTEMS, INC. LOCATED AT WASHINGTON AND CHERRY STREETS IN CONSHOHOCKEN, PA. FAXED A PART 21 NOTIFICATION INVOLVING THE RESULTS OF AN ANALYSIS PERFORMED ON A CHARGER RETURNED BY PSE&G. THE ANALYSIS CONCLUDED THAT THE WELDS ON THE WELD NUT HOLDING THE FILTER ASSEMBLY PANEL WERE NOT TO SPECIFICATION AND COULD RESULT IN FAILURE UNDER SEISMIC STRESS. SIMILAR CHARGERS IDENTIFIED BY SERIAL NUMBER WERE DELIVERED TO PSE&G AND NORTHERN STATES POWER. C&D POWER SYSTEMS WILL INFORM THE ABOVE CUSTOMERS OF THE DEFECTIVE WELD NUT AND PROVIDE A REPAIR PROCEDURE, IF DEFECTS ARE IDENTIFIED. *** END OF DOCUMENT ***

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