ML20064K399

RO Followup on 800403 Rept:On 800225,two Frequencies on Peak Shock Annunciator Sys Actuated Visual Alarms W/O Occurrence of Seismic Event.Problem Traced to Reed Switches in Containment Transmitter.Sys Checked & Recalibr

ML20064K399
Person / Time
Site:	Beaver Valley
Issue date:	11/21/1980
From:	Werling J DUQUESNE LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
BVPS:JAW:1033, NUDOCS 8012090269
Download: ML20064K399 (2)

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Shipp,in s;porti FA 15077 November 21, 1980

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1033 Beaver valles "- Station, Unit No. 1 Docket N. 50-334, icense No. DPR-66 Special Report

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s Mr. B. H. Grier, Director of Regulation United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

In accordance with Appendix A, Beaver Valley Technical Specification, 3.3.3.3, the following special report is submitted. This report is a follow-up report to a previous special report dated April 3, 1980.

On February 25, 1980, two frequencies on the Peak Shock Annunciator System actuated their visual alarms. After checking the Strong Motion Accelerograph seismic trigger, we determined that no actual seismic event has occurred. The

\ frequencies that annunciated were the 20.2 Hz 70% and 100: Operational Basis Earthquake (OBE) signals and the 25.4 Hz 70: (OBE) signal. Both were for the north-south direction.

Prior to troubleshocting the systes, the 1002 (OBE) alar: was reset ind the visual alarm cleared. The problem with the 70: (OBE) visual alars has been traced to the reed switches in the transmitter in containment.

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':n erber 21, 19S0 rips: JAW: 1033 Page 2 The system has been checked and calibrated by the vender. At present, the system has some slight impairments. Due to the state of the art .sdvances, a ore reliable system is available and a procurerant request has been submitted.

We will centinue to operate with the Peak Shock Annunciator as is until the new system arrives. We also have Peak Recording Accelereneters and the Accelerograph Recording systems to provide redundancy in ronitoring seismic events.

Very truly yours,

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J. A. Werling Superintendent cc: Director Of Management & Program Analysis United States Nuclear Reguitory Commission Washingten, D. C. 20555 W. J. Ross, BVPS Licensing Project Manager United States Nuclear Regulatory Ccamission Washington, D. C. 20555 D. A. Beckman, Nuclear Regulatory Commission, BVPS Site Inspector P. Higgins, Secretary, Prime Movers Committee - EEI Nuclear Safety Analysis Center, Palo Alto, California