05000395/LER-1983-006, Forwards Updated LER 83-006/03L-1.Detailed Event Analysis Encl

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Forwards Updated LER 83-006/03L-1.Detailed Event Analysis Encl
ML20071B833
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 02/22/1983
From: Dixon O
SOUTH CAROLINA ELECTRIC & GAS CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20071B834 List:
References
NUDOCS 8303010204
Download: ML20071B833 (3)


LER-2083-006, Forwards Updated LER 83-006/03L-1.Detailed Event Analysis Encl
Event date:
Report date:
3952083006R00 - NRC Website

text

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m SOUTH CAROLINA ELECTRIC &;Ggy MPANY Post opric. 7e4 -4 f; * * * '

COLUMelA. south CAROLINA 29218 ' "'gde i .- T ,

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uve$.5. "o'U.$r",'o,.. E.abruary , b83NO .~ ]4 ,

Mr. James P. O'Reilly, Director U.S. Nuclear Regulatory Commission Region II, Suite 3100 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 83-006, Revision 1

Dear Mr. O'Reilly:

Please find attached Licensee Event Report #83-006, Revision 1, 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 the Action Statement of Technical Specification 3.6.5.1, " Hydrogen Monitors," on January 13, 1983.

Revision 1 to this LER corrects administrative errors discovered by the Licensee. Should there be any questions, please' call us at your convenience.

~Very truly yours, s

O. W. D on, .

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 W. A. Williams, Jr. I&E (Washing ton)

O. S. Bradham Document Management Branch R. B. Clary INPO Records Center C. A. Price NPCF <

File

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- 'e Mr. James P. O'Reilly LER No.83-006, Revision 1 Page Two

-February 22,-1983 t 1

DETAILED DESCRIPTION OF' EVENT On January 13, 1983, with the~ Plant in Mode'1, a Common Failure alarm was received on Post Accident Hydrogen Analyzer "A". The l

. unit was declared inoperable .because of a possible ' heater f ailure in the sample compartment. The containment hydrogen monitors are

. required to be operable while in Modes-1 and 2 in accordance with Technical Specification 3.6.5.1.

PROBABLE CONSEQUENCES No adverse consequences resultad from this event. Hydrogen Analyzer "B" remained operableiduring the period of t.i me covered by this event. The satisfactory results obtained f ro t previously performed monthly operational tests provides assurance that Hydrogen. Analyzer "A" was operational ~up until the documented -

failure on January 13, 1983.

CAUSE(S) OF THE OCCURRENCE The cause.of Hydrogen Analyzer "A" failure was due to heat' damaged wiring in the sample compartment. A temporary cover previously installed on the sample compartment was inadequately' insulated.

The thermostat for the compartment heaters did not. detect-the high temperatures present in some area's of the compartment because of the excessive heat loss through tne temporary cover.

IMMEDIATE CORRECTIVE ACTIONS TAKEN The-hydrogen analyzer detector cell was found to be inoperable because of heat related damage to the component wiring and.

detector cell. A temporary cover previously installed on the heated sample compartment did not provide adequate insulation.

The thermostat for the heaters failed to detect the high temperatures present in some areas of the compartment because of the excessive heat loss in the vicinity of the thermostat. The damaged wiring and detector cell were replaced, and Hydrogen Analyzer "A" was returned to operable status on January'18, 1983, upon the completion of a satisfactory operational test with the appropriate surveillance test procedure.

l .

Mr. James P. O'Reilly LER No.83-006, Revision 1 Page Three February 22, 1983 IMMEDIATE CORRECTIVE ACTIONS TAKEN (Cont'd)

On February 4, 1983, Hydrogen Analyzer "A" was again removed from service in order to install a new cover and wiring (rated for 275'F environment). The components were replaced, and Hydrogen Analyzer " A" was returned to operable status on February 5,1983, upon the completion of a satisfactory operational test with the appropriate surveillance test procedure.

ACTION TAKEN TO PREVENT RECURRENCE The Licensee plans no further action in regards to this event other than performance of the normal surveillance requirements.

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