ML20137C760

Rev 1 to Special Rept ND1SS1:2506:on 850720,main Steam Monitor RM-MS-100B Declared Out of Svc Due to Receipt of High Alarm W/Normal Background Radioactivity Present.Caused by Loose Triaxial Connector.Replacement Parts Installed

ML20137C760
Person / Time
Site:	Beaver Valley
Issue date:	11/12/1985
From:	Lacey W DUQUESNE LIGHT CO.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
ND1SS1:2506, NUDOCS 8601160406
Download: ML20137C760 (2)

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M Telephone (412) 393-e000 fo*."e*o'[4 November 12, 1985 Shippingport, PA 15077-0004 NDISS1:2589 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Special Report Revision 1 to NDISS1:2506 Dr. Thomas E. Murley Regional Administrator United States Nuclear Regulatory Commission Region 1 Park Avenue King of Prussia, PA 19406 Gentlemen:

In accordance with Appendix A, Beaver Valley Technical Specification 3.3.3.1, " Radiation Monitoring Instrumentation," the following revision to a Special Report (NDISS1:2506, dated 7/29/85), is submitted. This report is required when the conditions specified in Technical Specification 3.3.1.1.6 are not satisfied.

On 7/20/85 at 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />, RM-MS-100B, Main Steam Monitor was declared out-of-service due to the receipt of a high alarm with normal background radioactivity present. This is nonconservative with respect to Technical Specification 3.3.3.1 and reportable per Technical Specification 3.3.3.1.b. This channel is one of three that monitors atmospheric steam dump valve and code safety relief valve discharge from the steam generator relief headers. After extensive troubleshooting, it was found that a loose triaxial connector between the detector and preamp board was the origin of the spurious readings. Replacement parts were installed and on 10/22/85 at 0320 hours0.0037 days <br />0.0889 hours <br />5.291005e-4 weeks <br />1.2176e-4 months <br />, RM-MS-100B was placed back in service. There were no safety implications to the public, as alternate monitoring was available during this time.

All similar monitors will be inspected for this type of problem during the performance of their next maintenance surveillance procedure.

Following the evaluation of any findings, the appropriate reporting

. . requirements will be fulfilled, if deemed necessary.

Very truly yours, Y o 'desa 9601160406 85111234 Wm. S. Lacey DR ADOCK 05 P M er v

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.I T. D. Murlsy -

- - " NDISS1:2589 November 12, 1985 Page 2 cc: Director of Management &. Program Analysis United States Nuclear Regulatory Commission i Washington, D.C. 20555 C. A. Roteck, Ohio Edison Director, Office of Inspection and Enforcement Headquarters United States Nuclear Regulatory Commission Washington, D.C. 20555 ,

Mr. Peter Tam, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, D.C. 20555 W. R. Troskoski, Nuclear Regulatory Commission, BVPS Site Inspector, BV-A Mr. Alex Timme, CAPCO Nuclear Projects Coordinator, Toledo Edison INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, GA 30339 G. E. Muckle Factory Mutual Engineering, Pittsburgh.

Mr. J. A. Triggiani, Operating Plant Projects Manager Mid Atlantic Area Westinghouse Electric Corporation Nuclear Services Integration Division Box 2728

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Pittsburgh, PA 15230 American Nuclear Insurers e/o Dottie Sherman, ANI Library i The Exchange Suite 270 Farmington Avenue &

Farmington, CN 06032 i

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