ML20072J205
| ML20072J205 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/24/1983 |
| From: | Dixon O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-83 NUDOCS 8306300018 | |
| Download: ML20072J205 (3) | |
Text
.
a SOUTH CAROLINA ELECTRIC & GAS COMPANY tisNRC RE010N 3
'""'c'*
COLuus A. south CAmoLINA 29218 3gg pG};.
June 24, 1983
- o. w. oixon. ;m.
p.O VICS PasslOENT NUOLEAR OpenArioN, Mr._ James.P. O'Reilly, Regional Administrator U. S.' Nuclear Regulatory Commission Region II, Suite 2900 t
101_Marietta Street, N.W.
Atlanta, GA 30303
Subject:
V.
C. Summer Nuclear Station
-Docket No. 50/395 Operating License No. NPF-12 Substantial Safety Hazard Speed Switch Charging Motors NE File:
3.1051
Dear Mr. O'Reilly:
On' June 24, 1983, a substantial safety hazard as defined in 10.CFR 21 was reported to the NRC Region II Office.
The hazard involved the potential failure of the speed switches for the Details Component Cooling Pump and Service Water Pump motors.
are give'n in the attachment to this letter.
This is considered a final report on this matter.
If you have any questions, please advise.
l Very truly yours, I
O. W. Dixon, 1
1
'CO:Ikh/fjc r
Attachment
.cc:
V.
C.
Summer D.
A. Lavigne E.
H. Crews, Jr.
C.
L. Ligon (NSRC)
[-.
T.fC. Nichols, Jr./
G. J. Braddick l
.O. W. Dixon, Jr.
J.
C. Miller f
E. ' C.
Roberts J. L. Skolds l
H.
N.
Cyrus J. B. Knotts, Jr.
l Group / General Managers W. D. Wagner O. S. Bradham I&E hashington R., B. Clary Document Management Branch l
C. A.
Price INPO Records Center A.
R. Koon NPCF File (Lic./Eng) l 1
I gk'1Cipit, COPY l@'M*J"o=lh keff i
S
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10CFR21 - SUBSTANTIAL SAFETY HAZARD 1.
Name and Address of Reporting Individual Chris Osier, South Carolina Electric & Gas P. O. Box 764 Columbia, S.C.
29218 2.
Identification of Basic Component Two speed motor, speed changing / interrupter switch, model HPL-C.
3.
Identification of Firm Supplying Component Brown Boveri Electric, Inc.
4.
Nature of Defect, Substantial Safety Hazard Created, and Evaluation The charging motor for the stored energy, spring operating mechanism in one speed transfer switchgear unit failed.
This l
l occurred when a lead running to the motor's brush holder became disconnected, which resulted from contact between the lead and the motor rotor. The motor, model number 115446-ll5VDC, was manufactured by Lamb Electric Division of AMETEK, Inc., Kent, Ohio.
Inspection of the seventeen similar motors installed in other switchgear revealed two additional units with the same apparent defect.
The j
malfunction of the motor could prevent the pump motor from changing l
speed or could cause the motor to shutdown.
5.
Date Information of Defect Was Obtained -
June 2, 1983 e
I 6.
Number and Location of Defect Component cooling pump speed switch #XES 2001C-CC Component cooling pump speed switch #XES 2001B-CC Service water pump speed switch #XES 2003C-SW 7.
Corrective Action All six switchgear units (18 motors) have been inspected.
The motor which failed has been replaced and two other motors, whose brush leads had apparently come in contact with the rotor, have been repaired. The repair consisted of placing the leads between the stator and the motor case where the rigidity of the wire will keep it clear of the rotor.
The inspection showed_the leads f..n the other motors to be secured clear of the rotor.
In addition, the supplier will be notified.
8.
Advice to Purchasers or Licensees It would be advisable to inspect this model charging motor in other pieces of similar lE equipment.
-m