05000395/LER-1983-004, Forwards LER 83-004/03L-0.Detailed Event Analysis Encl: Difference between revisions

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SOUTH CAROLINA ELECTRIC & GAS COMPANY POST OFFICE ?$4 COLuusiA. south CAROLINA 29218          b Q      ~-
O. W. DixoN. JR.                                                        .,3 uus*/J"o'UI"[o .                  February 7, 1983                      y          -
Mr. James P. O'Reilly, Director U.S. Nuclear Regulatory Commission                                        _
Region II, Suite 3100                                                      c 101 Marietta Street, N.W.
Atlanta, Georgia 30303                                                            .
 
==SUBJECT:==
Virgil C.      Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Thirty Day Written Report LER 83-004
 
==Dear Mr. O'Reilly:==
 
Please find attached Licensee Event Report #83-004 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 3.3.3.6e Table 3.3-10, Item 19, " Accident Monitoring Instrumentation,"
on January 9, 1983.
Should there be any questions, please call us at your convenience.
Very truly yours, O. W. g ixon      Jr.
CJM:OWD:dwf/fjc Attachment cc:    V. C. Summer                                A. R. Koon T. C. Nichols, Jr.                          G. D. Moffatt E. C. Roberts                                  Site QA O. W. Dixon, Jr.                              C. L. Ligon (NSRC)
H. N. Cyrus                                    G. J. Braddick H. T. Babb                                    J. L. Skolds D. A. Nauman                                  J. B. Knotts, Jr.
M. B. Whitaker, Jr.                            B. A. Bursey l                      W. A. Williams, Jr.                            I&E (Wachington) l                      O. S. Bradham                                  Document Management Branch
!                      R. B. Clary                                    INPO Records Center C. A. Price                                    NPCF l
l                                                                    File
                                                                                    . . L @SYe l  8302150215 830207
!  PDR ADOCK 05000395                                                            g
;  S                    PDR                                                      g flLM
 
.o Mr. James P. O'Reilly LER No. 83-004 Page Two February 7, 1983 DETAILED DESCRIPTION OF EVENT' On January 9,1983 with the Plant in Mode- 1, spurious " Inadequate Core Cooling" alarms were received on Channel B of the Reactor Coolant System Subcooling Margin Monitor. The channel was-de-energized when the sporadic behavior of the thermocouple portion of this circuitry affected the Plant computer systems.
The channel is required to be operable while in Modes 1, 2, and 3 by Technical Specification 3.3.3.6, Table 3.3-10, Item 19.
PROBABLE CONSEQUENCES There were no adverse consequences from this event. The Minimum Channels Operable requirements of Table 3 3-10 were met during the time period ~ encompassed by this event.
CAUSE(S) 0F THE OCCURRENCE The exact cause of the system malfunction is not known. It is possible that a hardware component was latched into a fault condition which cleared when the system was re-energized on January 10, 1983.
IMMEDIATE CORRECTIVE-ACTIONS TAKEN An investigation performed by maintenance personnel on January 9, 1983, indicated that the problem existed in the Low Level Data Board which initially processes the temperature inputs for the channel. The channel was de-energized af ter this determination due to alarms generated in the plant computer systems from the sporadic readings. On January 10, 1983, the system was re-energized, and the Channel Processor reset for additional troubleshooting. System operation was found to be normal af ter the completion of the equipment warm-up period. Channel B of the Subcooling Margin Monitor was returned to operable status on January 11, 1983, af ter the performance of a satisfactory channel calibration with the appropriate surveillance test procedure.
ACTION TAKEN TO PREVENT RECURRENCE The licensee plans no additional action in regards to this event unless warranted by similar occurrences in the future.
                                                                          -
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Revision as of 14:02, 31 March 2020

Forwards LER 83-004/03L-0.Detailed Event Analysis Encl
ML20064L325
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 02/07/1983
From: Dixon O
SOUTH CAROLINA ELECTRIC & GAS CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20064L326 List:
References
NUDOCS 8302150215
Download: ML20064L325 (2)


LER-2083-004, Forwards LER 83-004/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
3952083004R00 - NRC Website

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