05000395/LER-1983-024, Forwards LER 83-024/03L-0.Detailed Event Analysis Encl

Forwards LER 83-024/03L-0.Detailed Event Analysis Encl

ML20073C513
Person / Time
Site:	Summer
Issue date:	04/08/1983
From:	Dixon O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20073C515	List: 05000395/LER-1983-024, Forwards LER 83-024/03L-0.Detailed Event Analysis Encl 05000395/LER-1983-024-03, /03L-0:on 830311,main Steam Line C Radiation Monitor Experienced Spurious Alarms.Caused by Slack Detector Cable Allowing Signal Oscillations.Detector Cable Will Be More Adequately Secured by 830501
References
NUDOCS 8304130203
Download: ML20073C513 (2)

LER-1983-024, Forwards LER 83-024/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3951983024R00 - NRC Website

text

a SOUTH CAROLINA ELECTRIC & GAS COMPANY Post orrics 7s4 CoLuwa:A. south CAROLINA 29218 F

C O. W. DixoN. JR.

<h Vice PassIDENT NucLean OrtnarioNs April 8, 1983 io

[$

s Mr. James P. O'Reilly (c ^

rl 1 f'.

Regional Administrator s-U.S. Nuclear Regulatory Commission o

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 83-024

Dear Mr. O'Reilly:

Please find attat.a Licensee Event Report #83-024 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 (b) of Technical Specification 3.3.3.1,

" Radiation Monitoring Instrumentation," on March 11, 1983.

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

l Very trul your O. W.

xon, HCF: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 J.

B.

Knotts, Jr.

H. N. Cyrus Group / General Managers I&E (Washington)

O.

S.

Bradham Document Management Branch R.

B.

Clary C.

A.

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

A.

Lavigne File (Lic./Eng.)

O. L. Ligon (NSRC)

I Ofy1C30c~OP 8304130203 830400 PDR ADOCK 05000395 g

PDR g

d.

Mr. James P. O'Reilly LER No.83-024 Page Two April 8, 1983 EVENT DESCRIPTION'AND' PROBABLE' CONSEQUENCES At 0620 hours0.00718 days <br />0.172 hours <br />0.00103 weeks <br />2.3591e-4 months <br /> on March 11, 1983, with the Plant operating in Mode 1, Main Steamline "C" Radiation Monitor, RM-Gl9C, experienced spurious alarms with fluctuating meter indications.

The monitor was subsequently declared inoperable.

Technical Specification 3.3.3.1, " Radiation Monitoring Instrumentation," Item d(ii) requires RM-G190 to be operable.

Therefore, action statement (b) of the technical specification was entered.

The potential for adverse consequences as a result of the event was minimized as the Plant has not experienced any primary-to-secondary system leakages.

CAUSE AND CORRECTIVE ACTIONS

A maintenance work request was issued to investigate the spurious alarm condition.

A calibration check was satisfactorily j

performed.

The monitor was returned to operability at 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br />, l

on March 12, 1983, after the satisfactory completion of the applicable surveillance test.

Upon reinstallation of the detector, the monitor still experienced small signal oscillations.

An engineering evaluation attributed the spurious alarms to a slack detector cable, which allowed vibration to induce signal oscillations.

I The licensee plans to more adequately secure the detector cable to prevent recurrences of this event.

This action is expected to be completed by May 1, 1983.

l l