Part 21 Report - 1995-095
ACCESSION #: 9503100006
MKW POWER SYSTEMS, Inc.
March 2, 1995
Walter Haass
NRC
Office of Nuclear Reactor Regulation
11555 Rockville Pike
Rockville, MD 20852
Reference: Report No. 10CFR21-0070
Subject: Reportable detect with Potter & Brumfield relay Potter &
Brumfield #R10-E3286-2 (C&D #JR-461-E) C&D HVSD Printed
Circuit Board #MBC-2920-E
Dear Mr. Haas:
Enclosed is a copy of report no. 10CFR21-0070 concerning a reportable
defect with a Potter & Brumfield relay used in some C&D battery chargers.
This report is being mailed today to G.E. Nuclear, our only customer
affected by this notification.
Yours very truly,
MKW POWER SYSTEMS, INC.
Michael Nuding
General Manager - Quality Assurance
MN:dg
Enclosure
Post Office Box 1928 o Rocky Mount, North Carolina 27802-1928 o
Phone: (919) 977-2720
TWX: (510) 929-0725 o FAX: (919) 446-3830
MKW POWER SYSTEMS, Inc.
301 South Church Street
Station Square, Suite 100
Rocky Mount, NC 27804
Phone: (919) 977-2720
TWX: (510) 929-0725
FAX: (919) 446-1134
TELEFAX
DATE: March 1, 1995
COMPANY: Office of Nuclear Reactor Regulation
FAX NUMBER: 301-504-1887
ATTENTION: Mr. Thomas Murley
REFERENCE: Report #10CFR21-0070
FROM: Michael Nuding
IF YOU DO NOT RECEIVE ALL PAGES LISTED, PLEASE CALL EXTENSION 253.
PAGES (INCLUDING COVER SHEET): 6
Dear Sir:
Following this cover is a copy of Report No. 10CFR21-0070 concerning a
reportable defect reported by C&D Charter Power Systems for Potter &
Brumfield relay #R10-E3286-2 (C&D #JR-461-E) used on C&D printed circuit
board #MBC-2920-E. This report will be mailed tomorrow to G.E. Nuclear,
our only customer affected by this notification.
We understand that this defect was reported to the NRC in September, 1994
by C&D, but MKW Power Systems was not notified until 2/27/95.
A copy of the report is being mailed to you under a separate cover.
Should you have questions, please let us know.
Sincerely,
MKW POWER SYSTEMS, INC.
Michael Nuding
General Manager-Quality Assurance
MKW POWER SYSTEMS, Inc.
Report No. 10CFR21-0070
March 1, 1995
10CFR21 REPORTING OF DEFECTS
AND NON-COMPLIANCE
COMPONENT: Potter & Brumfield relay #R10-E3286-2 (C&D #JR-461-E)
C&D HVSD Printed Circuit Board #MBC-2920-E
SYSTEM: C&D Type ARR battery chargers.
CONCLUSION: Defect is Reportable in Accordance with 10CFR21
PREPARED BY: DATE:
Donald D. Galeazzi
Engineering Manager
PREPARED BY: DATE:
Michael Nuding
General Manager, Quality Assurance
Post Office Box 1928 o Rocky Mount, North Carolina 27802-1928 o
Phone: (919) 977-2720
TWX: (510) 929-0725 o FAX: (919) 446-3830
REPORT NO. 10CFR21-0070
PAGE: 1 OF 2
SUMMARY
MKW Power Systems received notification on 2/27/95 from C&D Charter Power
Systems (see Exhibit 1) about a 10CFR21 reported mechanical defect in the
latching mechanism of Potter & Brumfield #R10-E3286-2 relays (C&D #JR-
461-E). The relay is used on C&D High Voltage Shut Down Alarm Assembly
Printed Circuit Board #MBC-2920-E used in C&D Type ARR battery chargers.
The defect (filed to the NRC in 9/94) has been identified as a
dimensional non-conformance in the latching mechanism of the relay. The
defect is limited to two date code lots of material identified as lots
9108 and 9242. Failure of the relay may cause an apparent High Voltage
Shut Down of the battery charger, terminating charging of the battery
system until such time as the relay is reset; or, it may result in a
false alarm without shutdown of the battery charger. The batteries
themselves will be unaffected unless the shutdown condition is not
corrected for a sufficient period of time which allows the batteries to
discharge due to usage without recharging.
COMPONENTS
Potter & Brumfield relay #R10-E3286-2 (C&D #JR-461-E)
C&D HVSD Printed Circuit Board #MBC-2920-E
CUSTOMERS AFFECTED
G.E. Nuclear: C&D #MBC-2920-130B-E, customer P.O. #205-93R431
C&D #MBC-2920-130B-E, customer P.O. #205-93R505
DEFECT
The defect has been identified as a dimensional non-conformance in the
latching mechanism of the relay. The defect is limited to two date code
lots of material identified as lots 9108 and 9242. The lot code is
located on the front of the relay. Lot 9108 and 9242 were manufactured
by Potter & Brumfield on 2/22/91 and 10/30/92 respectively. C&D is not
able, however, to trace which boards these particular lots of relays were
used on.
CORRECTIVE ACTION
1) Check HVSD Printed Circuit Board in battery charger(s) or in stock
to assure that the relay on the board in not from one of the suspect
lots.
2) Any boards which contain relays from the suspect lot may be checked
by performing the following:
A defective relay may be identified by a simple pull test on the
reset button. A defective relay, when in the latched (pushed in)
position, will easily release when pulled on. A good relay will
take considerable force to release.
3) Any boards which contain relays from the suspect lot may be returned
for repair or replacement.
REPORT NO. 10CFR21-0070
PAGE: 2 OF 2
EXHIBIT 1
(2 pages)
C&D NOTIFICATION LETTER TO MKW POWER SYSTEMS
C&D
CHARTER POWER SYSTEMS (Registered Trademark)
3043 Walton Road
Plymouth Meeting, PA 19462
Telephone (215) 828-9000
FAX (215) 834-7306
February 27, 1995
MKW Power Systems, Inc.
301 South Church St.
Suite 100
Rocky Mount, NC 27802
Dear Don Galeazzi:
In September of 1994 C&D filed a part 21 notification with the NRC
Operations center stating that a mechanical defect had been found in the
latching mechanism of Potter and Brumfield R10-E3286-2 relays (C&D Part
Number JR-461-E) which may effect 1E safety related chargers in the
field. The relay is found on C&D High Voltage Shut Down Alarm Assembly
Printed Circuit Boards (MBC-2920-E) used in C&D ARR Chargers.
The failure has been identified as a dimensional non-conformance in the
latching mechanism of the relay. The defect is limited to two date code
lots of material identified as lots 9108 and 9242 on the relay. The lot
code is located on the front of the relay. Failure of the relay may
cause an apparent High Voltage Shut Down of the Charger terminating
charging of the battery system until such time as the relay is reset, or
it may result in a false alarm without shutdown of the charger. The
battery itself will be unaffected unless the shutdown condition is not
corrected for a sufficient period of time for the batteries to become
discharged. For this reason we do not believe that the failure mode
poses an imminent danger.
We have identified a time period during which these boards were
available, but are not able to trace which boards these particular lots
of relays were used on. Lot 9108 was manufactured by Potter & Brumfield
on February 22, 1991. Lot 9242 was manufactured by Potter & Brumfield on
October 30, 1992. All chargers which use this relay or replacement
boards that were sold from February 22, 1991 until the present.
Our records indicate that MKW Power Systems, Inc. purchased on Purchase
Order(s) 71053 and 71781, equipment which may be effected by this relay.
A list of chargers, boards and parts which can contain this relay is
attached to this letter. A defective relay may be identified by a simple
pull test on the reset button. A defective relay when in the latched
(pushed in) position will easily release when pulled on. A good relay
will take considerable force to release. Boards that are suspected of
having defective relays may be tested by the purchaser or returned to C&D
for test and repair or replacement.
You are advised to check the HVSD Printed Circuit Board in your charger
or stock to assure that the relay on the board is not from one of the
suspect lots. Any boards which contain relays from the suspect lot may
be returned to C&D for testing and repair or replacement.
If you have further questions or need to return a board for repair or
replacement please contact Graham Walker at 800 543-8630 ext. 316.
Sincerely,
T. (illegible) Kinden
Director Quality Assurance
cc: MKW Power Systems, Inc. file
Product Safety Committee file
G. Walker
RS-896
ARR Model Chargers utilizing the MBC-2920 HVSD Alarm Board
MODEL SPECIFICATION S- HVSD BOARD MBC -
XXXX-E XXXX
ARR24AC25F 2954-E 2920
ARR130HK50 1567-E 2920
ARR130HK50 2647-E 2920
ARR1300HK75F 2370-E 2920
ARR130HK100F 2370-E 2920
ARR130K150F 4062-E 2920
ARR1300K150F 2480-E 2920
ARR130K200 2588-E 2920
ARR130K200 2648-E 2920
ARR130K200f 3553-E 2920
ARR130K200F 3191-E 2920
ARR130K200F 2764-E 2920
ARR130K300 2368-E 2920
ARR130K300F 2955-E 2920
ARR260K50F 2721-E 2920
ARR260K200F U3644-E 2920
In addition, any of the 2920 series of High Voltage Shut Down (HVSD)
boards which were puchased as spare or replacement parts.
*** END OF DOCUMENT ***
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