ML19350A118
| ML19350A118 | |
| 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 8012020527 | |
| Download: ML19350A118 (2) | |
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DUQUESNE LIGHT COMPANY Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 November 21, 1980 BVPS: JAW:1033 Beaver Valley Power Station Unic No. 1 Docket No. 50-334, License No. DPR-66 SpeciaL Report 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 sttbmitted. 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 The seismic trigger, we determined that no actual seismic event has occurred.
frequencies that annunciated were the 20.2 Hz 70% and 100% Operational Basis Both were for the Earthquake (OBE) signals and the 25.4 Hz 70% (OBE) signal.
north-south direction.
Prior to troubleshooting the system, the 100% (OBE) alarm was reset and the visual alarm cleared. The problem with the 70% (OBE) visual alarm has f
been traced to the reed switches in the transmitter in containesut.
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Mr. B. H. Grier November 21, 1980 BVPS: JAW:1033 Page 2 The system has been checked and calibrated by the vendor. At present, the system has some slight impairments. Due to the state of the art advances, a more reliable system is available and a procurement request has been submitted.
We will continue to operate with the Peak Shock Annunciacor as is until the new system arrives. We also have Peak Recording Accelerometers and the Accelerograph Recording systems to provide redundancy in monitoring seismic events.
Very truly yours, J. A. Werling Superintendent cc: Director Of Management & Program Analysis United States Nuclear Reguitory Commission Washington, D. C.
20555 W. J. Ross, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, D. C.
20555 D. A. Beckman, Nuclear Regulatory Commission, BVPS Site Inspector P. Higgins, Secretary, Prime Movers Committee - EEI i
Nuclear Safety Analysis Center, Palo Alto, California