05000395/LER-1983-027, Forwards LER 83-027/03L-0.Detailed Event Analysis Encl

Forwards LER 83-027/03L-0.Detailed Event Analysis Encl

ML20069K159
Person / Time
Site:	Summer
Issue date:	04/15/1983
From:	Dixon O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20069K162	List: 05000395/LER-1983-027, Forwards LER 83-027/03L-0.Detailed Event Analysis Encl 05000395/LER-1983-027-03, /03L-0:on 830318,main Control Board Temp Indication TE-413 for Reactor Coolant Outlet Temp Exhibited Erratic Indications.Caused by Varying Resistance Between Compensated Lead & Low Side Resistance Leg of TE-413
References
NUDOCS 8304260222
Download: ML20069K159 (2)

LER-1983-027, Forwards LER 83-027/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3951983027R00 - NRC Website

text

.

e SOUTH CAROLINA ELECTRIC & GAS COMPANY post orpict 7s4 CoLuweiA. south CAnouNA 29218

,,s W

O. W. DixoN, JR, 7

VICE PasstDENT

'O N

T4O NvCLeam OpematioNs April 15, 1983 CE i' 3 y

Y.E E3 i

Mr. James P. O'Reilly Regional Administrator

]',

U.S. Nuclear Regulatory Commission Region II, Suite 2900 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 83-027

Dear Mr. O'Reilly:

Please find attached Licensee Event Report #83-027 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 3.3.3.6, " Accident Monitoring Instrumentation," on March 18, 1983.

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

Very tru

yours, O. W.

ixon, Jr.

CJM:0WD/dwr Attachment cc:

V.

C.

Summer G. J. Braddick T.

C.

Nichols, Jr.,/0. W.

Dixon, Jr.

J.

C. Miller E.

C.

Roberts J. L. Skolds H. N.

Cyrus J.

B.

Knotts, Jr.

Group / General Managers I&E (Washington)

O.

S. Bradham Document Management R.

B.

Clary Branch C.

A.

Price INPO Records Center A. R. Koon NPCF D.

A.

Lavigne File (Lic./Eng.)

C.

L. Ligon (NSRC)

% [\\[ COPY ry' &

8304260222 830415 PDR ADOCK 05000395 S

PM L

1

+

Mr. James'P. O'Reilly 4

LER No.83-027 Page Two April 15, 1983 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES At 1045 hours0.0121 days <br />0.29 hours <br />0.00173 weeks <br />3.976225e-4 months <br /> on March 18, 1983, with the Plant in Mode 3, the Main. Control Board temperature indication (TE-413) for Reactor Coolant Outlet Temperature - THOT (Wide Range) began to exhibit erratic indications.

At the time of this occurrence, the Plant was in cooldown for the upcoming modification to the Westinghouse D-3 Steam Generators.

The temperature instrumentation channel is used for Post Accident Monitoring and is also one of three temperature inputs for Train "A" of the Cold Overpressure Protection System (COPS), which is activated when the Reactor Coolant System (RCS) temperature is less than or equal to 300 F.

The channel was declared inoperable at 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> in accordance with Action Statement (a) of Technical Specification 3.3.3.6.

The i

initial investigation performed by maintenance personnel determined that the erratic behavior was due to a failure of the temperature element.

In order to prevent the erratic output of TE-413.from causing an inadvertent actuation signal from the COPS circuitry to. Power Operated Relief. Valve (PORV) PCV-445A, the i

channel was placed in the test position until repairs could be i

performed.

The TE-413 input to the "Lo Select" auctioneered system temperature portion of the COPS circuitry was effectively failed high when the channel was placed in test.

Therefore, the COPS circuitry remained operable and _ continued to perform the design function with the remaining two (2) operable temperature 1

inputs to the "Lo Select"~ auctioneered system.

There were no adverse consequences in regards to this occurrence since the redundant Post Accident Monitoring instrumentation channel remained operable, and the Plant entered Mode 4 on the same day as the occurrence.

j

CAUSE AND CORRECTIVE ACTIONS

The cause-of the erratic indications axi the Main Control Board-i temperature indicator is attributed to a varying resistance between ' the compensated lead and low side resistance leg of TE-413 with static temperature conditions.- The temperature element was

. replaced, and the channel returned to operable status at 1730

- hours on March 26, 1983, upon the satisfactory completion of a channel calibration with the appropriate surveillance test procedure.

~

' The111censee plans. no additional action in regards to this event unless warranted 'by similar failures in the future, i

i I

I l-