ML20237J030

Special Rept:On 870728,in Containment high-range Monitor Declared out-of-svc Due to Loss of Detector Signal & Repeated Check Source Failure.Caused by Overheating pico- Ampmeter Board.No Potential for Radiation Levels Noted

ML20237J030
Person / Time
Site:	Beaver Valley
Issue date:	08/03/1987
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
ND2SPM:3276, NUDOCS 8708170466
Download: ML20237J030 (2)

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Telephone (412) 3934000 Nuclear Division P.o. Box 4 Shippingport, PA 150776 3, MU i ND2SPM:3276 Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NFR-64 Special Report United States Nuclear Regulatory Commission Document Centrol Desk Washington, DC 20555 Gentlemen:

In accordance with Appendix A, Beaver Valley Teciclical Specification 3.3.3.1,

" Radiation Monitoring Instrumentation," the following Special Report is submitted.

This report is required when the conditions specified in Technical Specification 3.3.3.1.b are not satisfied.

On 7/28/87 at 0150 hours0.00174 days <br />0.0417 hours <br />2.480159e-4 weeks <br />5.7075e-5 months <br />, 2RMR-RQ207, in-containment high range monitor, was declared Out-of-Service due to a loss of detector signal and repeated check source failure. The problem proved to be intermittent in nature with periods of normal operation occurring between failures. This is nonconservative with respect to Technical Specification 3.3.3.1 and reportable per Technical Specification 3.3.3.1.b. The root cause was determined to be an overheating pico-ampmeter board, which processes the detector signal. The board was subsequently replaced and the monitor was calibrated and returned to service on 7/31/87 at 1810 hours0.0209 days <br />0.503 hours <br />0.00299 weeks <br />6.88705e-4 months <br />. Alternate preplanned monitoring methods were in effect until the channel was placed back in service. In addition, there was no potential for radiation levels in containment as the plant had not reached initial criticality.

Very truly yours, j 7

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W. S'. Lacey KJW jas P

Y, G708170466 870003 i PDR ADOCK 05000412 S PDR

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cc: Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Commission Region 1 King of Prussia, PA 19406 C. A. Roteck, Ohio Edison Mr. Peter Tam, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, DC 20555 J. Beall, Nuclear Regulatory Commission, BVPS Senior Resident Inspector Mr. Alex Timme, CAPCO Nuclear Projects Coordinator, Toledo Edison INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, GA 30339 G. E. Muckle, Factor Mutual Engineering, Pittsburgh Mr. J. A. Triggiani, Operating Plaat Projects Manager Mid Atlantic Area Westinghouse Electric Corporation Nuclear Services Integration Division Box 355 Pittsburgh, PA 15230 American Nuclear Insurers c/o Dottie Sherman, ANI Library The Exchange Suite 245 270 Farmington Avenue Farmington, CT 06032 t.

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