05000272/LER-1983-062, Supplemental LER 83-062/99X-1:on 831122,during Testing on Seismic Instrumentation,Triaxial Time History Accelograph Did Not Respond as Required.Caused by Detector Failure. Accelerometer Replaced

Supplemental LER 83-062/99X-1:on 831122,during Testing on Seismic Instrumentation,Triaxial Time History Accelograph Did Not Respond as Required.Caused by Detector Failure. Accelerometer Replaced

ML20087A856
Person / Time
Site:	Salem
Issue date:	02/24/1984
From:	Rupp J, Zupko J Public Service Enterprise Group
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-83-062-99X, LER-83-62-99X, NUDOCS 8403080246
Download: ML20087A856 (4)

LER-2083-062, Supplemental LER 83-062/99X-1:on 831122,during Testing on Seismic Instrumentation,Triaxial Time History Accelograph Did Not Respond as Required.Caused by Detector Failure. Accelerometer Replaced

Event date:
Report date:
2722083062R00 - NRC Website

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61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h O 2 lOn November 22, 1983, while perforniir.g routine survaillance testing on Seismic Instru- l

,o,3y l mentation, the Triaxial Time-History Accelograph located behind the bioshield on l o 4 l81' Elevation of the containment building, did not respond as required. The instru- l o 3 l ment was declared inoperable, and a special report was subnitted on December 30, 1983. l IOl6l lOn January 4, 1984, during a maintenance shutdown, the accelerometer was replaced. Thel y o l 7 l l redundant accelographs were operable throughout the occurrence, and the event involved l n undue risks to the health or safety of the public. l 10181i 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VA LV E CODE CODS SU8 CODE COMPONENT CODE SUSCODE SUSCODE g7 d

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di 42 43 44 47 CAUS,E DESCRIPTION AND CORRECTIVE ACTIONS h 1 1 o lThe detector (Kinemetrics Model FBA-3 accelerometer) was contaminated, which I i 1 l precluded the possibility of troubleshooting and determining the exact failure I

,, y7, pnechanism. Since this was the first detector failure experienced, the occurrence l l

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J. Rupp (609) 339-4309 NAME OF PREPARER PHONE: $

O PSIBG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station February 24, 1984 U.S. Nuclear Regulatory Commission Document Control Desk ,

Washington, DC 20555

Dear Sir:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 83-062/99X-1 SUPPLEMENTAL REPORT Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.2.b, we are submitting supplemental Licensee Event Report for Reportable Occurrence 83-062/99X-1.

Sincerely yours, 4 i

/

J. M. Zupko, Jr.

General Managar -

Salem Operations JR:kll/6p CC: Distribution

't.

h l I The Energy People ex e.

b Report Number: 83-062/ 99X-1

' Report Date: 02/24/84-Occurrence Date: 11/22/83 Facility: Salem Generating Station Unit 1

.Public Service Electric & Gas Company Hancock's-Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Seismic Instrumentation - Reactor Containment 81' Elevation - Triaxial Time-History Accelograph - Inoperable This report was initiated by Incident Report 83-211 CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 100 % - Unit Load 1150 MWe DESCRIPTION OF OCCURRENCE:

Approximately 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />, November 22, 1983, during routine power operation, while performing surveillance testing of seismic monitoring instrumentation, the Triaxial Time-History Accelograph (located inside cf the bioshield on the 81' elevation of the contaiment building) did not' respond as required. The instrument'was declared inoperable at '

that; time.- The symptoms indicate a failed detector. Because the o detector is located inside of the bioshield, a thorough investigation could not be conducted while the unit was at power. In accordance

-with Technical' Specification Action Statement 3.3.3.3.a, a special

. report was submitted to the Commission on December 30, 1983, stating that the. instrument would be repaired during'the next available shutdown..

l APPARENT CAUSE OF OCCURRENCE:

~

' Subsequently, during a maintenance shutdown, investigation revealed that the detector ( Kinemetrics Model FBA-3 accelerometer) had failed.

The detector was contaminated, which precluded the possibility of troubleshooting and determining the exact failure mechanism. Since this was-the first detector failure experienced, the occurrence was or

.aniisolated nature.

~ ANALYSIS OF OCCURRENCE:

~

The operability of the seismic instrumentation ensures that sufficient

.I capability is available to promptly determine the magnitude of a L seismic event and evaluate the response of those features important to safety,- 'This capability is' required to permit comparison of the measured response.to that used in the design basis-for the facility. ,

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LER 83-062/99X-1 ANALYSIS OF OCCURRENCE: (cont'd)

Technical Specification Action Statement 3.3.3.3.a. states:

With one or more seismic monitoring instruments inoperable for more than 30 days, prepare and submit a special report to the Commission pursuant to Specification 6.9.2 within the next 10 days outlining the cause of the malfunction and the plans for restoring the instrument (s) to operable status.

The redundant Triaxial Time-History Accelographs, located on the 130' olevation of the "$ntainment building and on the 122' elevation of the

, cuxiliary buildint. ere operable throughout the occurrence. This cvent involved no undue risk to the health or safety of the public.

Because the instrument was not repaired within thirty (30) days, the initial report was submitted in accordance with Technical Specification 6.9.2.b.

CORRECTIVE ACTION:

On January 4, 1984, the Triaxial Time-History Accelerometer was replaced. The surveillance was again performed, with the instrument functioning satisfactorily.

FAILURE DATA:

.Kinemetrics Inc.

Time-History Accelograph

. Accelerometer Model FBA-3 l

Prepared By J. Runo G[ner$1 Mana'fer -

Salem Operations SORC Meeting No.84-024