ML20236Q112

Special Rept SR-87-006-00:on 871028,primary Meteorological Tower Upper Wind Speed & Wind Direction Instrument out-of- Svc in Excess of 7 Days.Caused by Failed Signal Converter. Parts Replaced & Instrument Returned to Svc on 871104

ML20236Q112
Person / Time
Site:	Waterford
Issue date:	11/16/1987
From:	Carns N LOUISIANA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
SR-87-006-00, SR-87-6, W3A87-0151, W3A87-151, NUDOCS 8711190188
Download: ML20236Q112 (4)

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Ref:.10CFR50.36(c)(2)'

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]Pl~' P O W E R & L I G H TLouisiama /

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WATERFORD 3 SES

• P. O. BOX B

• KILLONA, LA 70066

$1E0NSYS November 16, 1987 W3A87-0151 A4.05 QA U.S. Nuclear Regulatory Commission ATTENTION:

Document Control Desk Washington, D.C.

20555

SUBJECT:

Waterford 3 SES Docket No. 50-382 License No. NPF-38 Reporting of Special Report Attached is Special Report Number SR-87-006-00 for Waterford Steam Electric Station Unit 3.

This Special Report is submitted per 10CFR50.36(c)(2) and Technical Specifications 3.3.3.4 and 6.9.2.

Very truly yours,

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N.S. Carns Plant Manager - Nuclear NSC/WEM:rk Attachment cc:

R.D. Martin, NRC Resident Inspectors Office, INPO Records Center (J.T. Wheelock), E.L. Blake, W.M. Stevenson, J.H. Wilson 8711190188 871116 PDR ADOCK 05000382

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"AN EQUAL OPPORTUNITY EMPLOYER'8

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• l SPECIAL REPORT.

SR-87-006-00 Primary Meteorological Tower Upper Wind Speed and Wind Direction Instrument Out of Service Due to Failed Signal Converter INTRODUCTION At 0835 hours0.00966 days <br />0.232 hours <br />0.00138 weeks <br />3.177175e-4 months <br /> on October 28, 1987, Waterford Steam Electric Station Unit 3 was operating at 100% power when Operations personnel declared the Primary Meteoro-logical Tower (PMT)' instruments out of service in preparation for the semi-annual calibration per procedure MI-3-395, " Primary Meteorological Tower Instruments Calibration". During the calibration, it was discovered that the Upper Wind Speed and Wind Direction Converter (WSDC) could not be calib'.ated.

After subsequent troubleshooting and parts procurement, an operable WSDC was installed and satisfactorily tested. The PMT Upper Wind Speed and Direction Instrument was returned to service at 1810 hours0.0209 days <br />0.503 hours <br />0.00299 weeks <br />6.88705e-4 months <br /> on November 4, 1987.

Since the PMT Upper Wind Speed and Wind Direction Instrument could not be returned to service within seven days, this report is submitted pursuant to Technical Specification 3.3.3.4 and 6.9.2.

NARRATIVE At 0835 hours0.00966 days <br />0.232 hours <br />0.00138 weeks <br />3.177175e-4 months <br /> on October 28, 1987, Waterford Steam Electric Station Unit 3 was operating at 100% power when Operations personnel declared the Primary Meteoro-logical Tower (PMT) Instruments out of service in preparation for the semi-annual calibration per procedure MI-3-395, " Primary Meteorological Tower Instruments Calibration." This calibration normally takes Maintenance

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On October 29, 1987, while performing the Upper Wind Direction Loop Check per-section 8.3.4 of MI-3-395, the Upper Wind Speed and Wind Direction Converter (WSDC), EM-ISTC-0100, failed to meet the accuracy criteria of the Instrumentation Loop Check Record (ILCR).

The ILCR contains input test voltages, ideal output voltages, space for recording actual output voltages, and accuracy requirements for testing of instrument and' control equipment.

The WSDC processes wind speed and direction signals and outputs them to control and display functions.

Since the WSDC failed the loop check, a calibration of the Upper WSDC was attempted on October 29, 1987.

It was found that the WSDC could not be calibrated. The difference between actual and ideal output voltages was greater than allowed, and adjustments could not bring the circuit card into tolerance.

On October 31, 1987, four spare WSDC cards were drawn from warehouse stock.

Attempts were made on October 31 and November 1 to calibrate these spare cards, but all of the spare cards had drifted out of tolerance and could not be satis-factorily calibrated.

On November 2, 1987, the inoperable WSDC circuit cards were brought to the site Card Repair Group (CRG). Procurement was also notified to order a new card (manufacturer's part number 209430020) from the manufacturer, Belfort Company (formerly Meterology Research, Inc.).

The first card was repaired on November 4, 1987.

Feedback Resistor R216, a 100 kilo-ohm. wire wound resistor with a 1% tolerance, had drifted out of specification, causing an increased gain in the feedback loop on the circuit card.

The CRG is continuing to troubleshoot the remaining circuit cards.

The operable WSDC circuit card was installed and satisfactorily retested on November 4, 1987. The FMT Upper Wind Speed and Wind Direction instrument was returned to service at 1810 hours0.0209 days <br />0.503 hours <br />0.00299 weeks <br />6.88705e-4 months <br /> on November 4, 1987.

This instrument could not be returned to service within seven days, therefore this report is submitted pursuant to Technical Specification 3.3.3.4 and 6.9.2.

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o Since the lower wind speed and direction indication was available.during this period, there was data available for estimating potential radiation doses to the public as a result of a routine or accidental release of radiologir..t material to the atmosphere.

Since this instrumentation was availatie and there were no such releases during this period, there was no safety significance to this event, i

PLANT CONTACT D.W. Vinci,. Maintenance Superintendent, 504/464-3138 i

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