United States Nuclear Regulatory Commission - Protecting People and the Environment

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.


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