05000395/LER-1983-034, Forwards LER 83-034/03L-0.Detailed Event Analysis Encl

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Forwards LER 83-034/03L-0.Detailed Event Analysis Encl
ML20073S707
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 05/02/1983
From: Dixon O
SOUTH CAROLINA ELECTRIC & GAS CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20073S709 List:
References
NUDOCS 8305100089
Download: ML20073S707 (2)


LER-2083-034, Forwards LER 83-034/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
3952083034R00 - NRC Website

text

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SOUTH CAROLINA ELECTRIC & GAS COMPANY post craics ve4 COLUMBIA. Soutw CAROLINA 29218 O. W. CixON, JR.

Vice Passiots?

NWCLeam O*e= Avions May 2, 1983 t-Mr. James P. O'Reilly o

.r_

Regional Administrator U.S. Nuclear Regulatory Commission ,

Region II, Suite 2900 ';- -

101 Marietta Street, N.W. T Atlanta, Georgia 30303 g, n.

SUBJECT:

Virgil C. Summer Nuclear Station Docket No. 50/395 ~

Operating License No. NPF-12 Thirty Day Written he. port LER 83-034

Dear Mr. O'Reilly:

Please find attached Licensee Event Report #83-034 for Virgil C.

Summer Nuclear Station. This Thirty Day Report is required by Technical Specification 6.9.1.13.(b) as a result of entry into Action Statement (a) of Technical Specification 3.4.1.4, " Cold Shutdown - Loops Filled ," on April 9, 1983.

Should there be any questions, please call us at your convenience.

Very teu y yours, feA O. W. DiI , Jr.

CJM:OWD/dwr Attachment ec: V. C. Summer G. J. Braddick T. C. Nichols, Jr.,/0. W. Dixon, Jr. J. C. Miller l

E. C. Roberts J. L. Skolds H. N. Cyrus J. B. Knotts, Jr.

Group / General Managers I&E (Washington) l Document Management i 0. S. Bradham Branch R. B. Clary l

C. A. Price INPO Records Center Koon NPCF A. R. F ile (Lic./Eng.)

D. A. Lavigne C. L. Ligon (NSRC)

G305100089 830502 PDR ADOCK 05000395 PDR t ,y rim A1, ro1 N S _-

1 Mr. James P. O'Reilly LER No.83-034 Page Two May 2, 1983 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES On April 9, 1983, with the Plant in Mode 5, the motor junction box cover on Residual Heat Removal (RHR) Pump "B" (XPP-31B) was found to have a burned area, which was the apparent result of an electrical short. The pump was declared inoperable at 1007 hours0.0117 days <br />0.28 hours <br />0.00167 weeks <br />3.831635e-4 months <br /> in accordance with Action Statement (a) of Technical Specification 3.4.1.4 until repairs could be performed by maintenance.

There were no adverse consequences from this occurrence since the motor lead was not grounded at the time of the discovery.

Additionally, prior to April 9, 1983, the electrical short did not develop sufficient current flow to trip the motor circuit breaker and interrupt the normal operation of RHR Pump "B".

CAUSE AND CORRECTIVE ACTIONS Minor maintenance, which required the determination of motor leads, was performed on RHR Pump "B" during March 16 to 19, 1983.

The "B" phase motor lead apparently rubbed against the junction box cover during subsequent pump operation, and an electrical short to ground developed as a result of insulation failure.

The termination was retaped, and RHR Pump "B" was returned to operable status upon completion of electrical checks and a test run at 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br /> on April 9, 1983. This occurrence does not appear to be a generic problem, however,the licensee does plan to remove some excess slack in the power cable during the next equipment outage in order to prevent a possible future recurrence.