ML20155J577

Special Rept SR-86-002-00:on 860423,wide Range Gas Monitor Declared Inoperable.Caused by Broken Resistance Wire within General Atomic Sample Velocity Probe.Alternate Monitoring Procedure EP-2-050 Established.Probe Replaced

ML20155J577
Person / Time
Site:	Waterford
Issue date:	05/12/1986
From:	Barkhurst R LOUISIANA POWER & LIGHT CO.
To:	Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
SR-86-002-00, SR-86-2, W3A86-0047, W3A86-47, NUDOCS 8605270024
Download: ML20155J577 (3)

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P O W E R & L I G H T[ WATERFORD 3 SES

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ESYssEsNU May 12, 1986 W3A86-0047 A4.05 QA Mr. Robert D. Martin Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76011

Subject:

Waterford 3 SES Docket No. 50-382 License No. NPF-38 Reporting of Special Report

Dear Mr. Martin:

Attached is Special Report Number SR-86-002-00 for the Waterford Steam Electric Station Unit 3. This Special Report is submitted per Technical Specification 6.9.2.

Very truly yours, R.P. Barkhurst Plant Manager - Nuclear RPB/LWL/wp Attachment cc: NRC Document Control Desk NRC, Director, Office of I&E G.W. Knighton, NRC-NRR J.H. Wilson, NRC-NRR NRC Resident Inspectors Office INPO Records Center (J.T. Wheelock)

B.W. Churchill W.M. Stevenson

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s-i SPECIAL REPORT SR-86-002-00 Velocity Probe Failure Rendered Wide Range Gas Monitor Inoperable Greater than Seven Days INTRODUCTION At approximately 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on April 23, 1986 Waterford Steam Electric Station Unit 3 was operating at 100% reactor power when operations personnel declared Wide Range Gas Monitor (WRCM), PRM-IR-0110, incperable due to a defective sample velocity probe. In accordance with Technical Specification 3.3.3.1 Action 27, Health Physics established the preplanned alternate method of monitoring plant stack emissions as defined in procedure EP-2-050, "Off-Site Dose Assessment (Manual)".

Since the monitor could not be replaced within seven days, this report is being submitted pursuant to Technical Specification 3.3.3.1 Action 27 and 6.9.2.

NARRATIVE At approximately 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on April 23, 1986 Waterford Steam Electric Station Unit 3 was operating at 100% reactor power when operations personnel declared the Wide Range Gas Monitor (WRGM), PRM-IR-0110, inoperable due to a defective sample velocity probe. As a result, the auxiliary sample pump used for the middle and high range detector flow path did not appropriately energize, rendering the monitor inoperable. In accordance with Technical Specification 3.3.3.1 Action 27 Health Physics established the preplanned alternate method of monitoring plant stack emissions as defined in procedure EP-2-050, "Off-Site Dose Assessment (Manual)".

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The failure was due to a broken resistance wire located within the probe.

Since the probe is exposed to the flow stream, small vibrations are induced in the probe resulting in a fati,uet failure of the wire. A replacement probe could not be calibrated; therefore, a new probe was ordered from the manufacturer j (General Atomic). Since the replacement probe could not be obtained before the end of the seven day limit (April 30, 1986), as defined in Technical Specification 3.3.3.1 Action 27, this Special Report is submitted pursuant to Specification 6.9.2.

Since Health Physics personnel had an alternate method for monitoring plant stack emissions, and since the low range detector was operable, the inoperability of the wide range monitor did not pose a safety concern.

Upon receipt, maintenance personnel calibrated and replaced the probe.

Operations personnel placed the Wide Range Gas Monitor in an operable status at 1742 hours0.0202 days <br />0.484 hours <br />0.00288 weeks <br />6.62831e-4 months <br /> on May 2, 1986. To assure a reliable supply, plant personnel have increased the maximum / minimum reorder levels of the subject probes.

PLANT CONTACT T. Smith, Maintenance Superintendent, 504/464-3138 2