05000395/LER-1982-029, Forwards LER 82-029/03L-0.Detailed Event Analysis Encl

Forwards LER 82-029/03L-0.Detailed Event Analysis Encl

ML20028B733
Person / Time
Site:	Summer
Issue date:	11/23/1982
From:	Dixon O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028B734	List: 05000395/LER-1982-029, Forwards LER 82-029/03L-0.Detailed Event Analysis Encl 05000395/LER-1982-029-03, /03L-0:on 821025,during Zero Power Testing, Isolation Amplifier Resistor Input on Power Range Channel NI-44 Found Out of Calibr Tolerance.Caused by Instrument Drift.Channel Removed from Svc & Calibr
References
NUDOCS 8212030188
Download: ML20028B733 (2)

LER-1982-029, Forwards LER 82-029/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3951982029R00 - NRC Website

text

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SOUTH CAROLINA ELECTQlg & GAS. COMPANY post opric. 7s4 7 7 CoLuus:A. south CAnousA'29216 O. W. DIXoN. JR.

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November 23, 1982 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 82-029

Dear Mr. O'Reilly:

Please find attached Licensee Event Re*

t #62-029 for Virgil C.

Summer Nuclear Station.

This Thir).. Day Report is required by Technical Specification 6.9.1.13.(b) as a result of entry into Action Statement 2 of Technical Specification 3.3.1,

" Reactor Trip System Instrumentation," on October 25, 1982.

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

Very truly yours

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0. W. Dixon, Jr.

CJM:0WD:dwr Attachment cc:

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Summer A. R. Koon T. C. Nichols, Jr.

H. Radin G.

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0. 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 (Washington)

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S. Bradham Document Management Branch R. B.

Clary INPO Records Center M. N.

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.I Mr. James P. O'Reilly LER No.82-029 Page Two November 23, 1982 DETAILED DESCRIPTION OF EVENT During the performance of NI-44 Power Range Operational Test (STP-302.041) on October 25, 1982, the Isolation Amplifier Resistor Input was found to be slightly out of tolerance.

The Plant was in Mode 2, and Zero Power Testing nas in progress at the time.

The channel was declared inoperable per Technical Specification 3 3.1, Action Statement 2.

PROBABLE CONSEQUENCES No adverse consequences existed prior to or af ter discovery of the out-of-tolerance condition because:

a) Isolation Amplifier Drif t only affected remote indication, and all of the channel safety functions were operable.

b) Three (3) operable NI Power Channels remained in service until the restoration of NI-44.

CAUSE(S) 0F THE OCCURRENCE The cause of this occurrence is attributed to Instrument Drif t.

IMMEDIATE CORRECTIVE ACTIONS TAKEN 4

Power Range Channel NI-44 was calibrated by the Instrumentation Group by means of Surveillance Test Procedure (STP) 310.008.

The channel was returned to operable status on October 27, 1982.

ACTION TAKEN TO PREVENT RECURRENCE No further action other than the normal surveillance testing is planned by the licensee.

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