ML20151U884

Special Rept SR-88-008-00:on 880726,plant Stack Effluent Accident wide-range Gas Monitor Declared Inoperable.Caused by Pump Failing Step 8.4.2.18 Which Checks high-range Sample Flow within Specified Tolerance.Transmitter Replaced

ML20151U884
Person / Time
Site:	Waterford
Issue date:	08/16/1988
From:	Carns N LOUISIANA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
SR-88-008-00, SR-88-8, W3A88-0093, W3A88-93, NUDOCS 8808190288
Download: ML20151U884 (4)

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Fof: 10CFR50.36(c)(2)

LOUISIANA P O W E R & L l G H T! WATERFORO 3 SES

• PO. BOX B 70066-0751

+ KILLONA. LA

$iuSOSrsSIO August 16, 1988 W3A88-0093 A4.05 QA U.S. Nuclear Regulatory Commission ATTENTION: Document Contcol Desk Washington, D.C. 20555

SUBJECT:

Waterford 3 SES Docket No. 50-382 License No. NPF-38 Reporting of Special Reoort Attached is Special Report Number SR-88-008-00 for Waterford Steam Electric Station Unit 3. This Special Report is submitted per 10CFR50.36(c)(2) and Technical Specificatior.a 3.3.3.1 and 6.9.2.

Very truly yours, N.S. Carns Plant Manager - Nuclear NSC/WEM:rk Attachment cc: R.D. Martin, NRC Recident Inspectors Office, INPO Records Center (J.T. Wheelock), E.L. Blake, W.M. Stevenson, D.L. Wigginton 8808190289 880816 PDR ADOC% 0S000382 g PNU I \

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4 SPECIAL REPORT SR-88-008-00 Plant Stack Effluent Accident Wide Range '-

Gas Monitoa Inoperable Due to Worn Sample Pump INTRODUCTION At 1409 hours0.0163 days <br />0.391 hours <br />0.00233 weeks <br />5.361245e-4 months <br /> on July 26, 1988, Waterford Steam Electric Station Unit 3 was operating at 100% reactor power when Operations personnel declared the Plant Stack Effluent Accident Wide Range Gas Monitor (WRGM), PRM-IRE-0110, inoperable. In accordance with Technical Specification 3.3.3.1 Action 27, Health Physics personnel implemented the preplanned alternate method for a

monitoring plant stack effluent gas as defined in procedure EP-2-050, "Off-site Dose Assessment (Manual)."

Since the monitor could not be returned to service within seven days, this ,

report is submitted pursuant to Technical Specification 3.3.3.1 and 6.9.2.

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NARRATIVE On July 26, 1988, Maintenance personnel began performance of the monthly functional surveillance on the Plant Stack Effluent Accident Wide Range Gas Monitor (WRGM) in accordance with surveillance procedure MI-3-382, "Plant Vent Stack High Range Noble Gas Radiation Monitor Channel Functional Test PRM-IRE-0110." This monthly functional test is required by Technical Specification (TS) Surveillance 4.3.3.1. MI-3-382 functionally checks the operation of the detector, sample flow pumps, alarms, and recorders. During performance of MI-3-382, the mid/hich range sample pump failed step 8.4.2.18 which checks the high range sample flow within a specified tolerance. The pump could not achieve enough sample flow to pass this step.

Condition Identification (CI) 257377 was initiated at 1344 hours0.0156 days <br />0.373 hours <br />0.00222 weeks <br />5.11392e-4 months <br /> on July 26, 1988, to identify the above discrepancy. After reviewing CI 257377, Operations personnel declared the WRGM out-of-service at 1409 hours0.0163 days <br />0.391 hours <br />0.00233 weeks <br />5.361245e-4 months <br /> on July 26, 1988. Work Authorization (WA) 01022360 was initiated to correct the discrepancy. In accoidance with TS 3.3.3.1 Action 27, Health Physics )

(HP) personnel implemented the preplanned alternate nethod~for monitoring plant stack effluent gas as defined in procedure EP-2-050, "Off-Site Dose Assessment (Manual) . "

I In order to achieve the proper flow control, neveral corrective actions were takon. The flow transmitter was replaced and calibrated. The motor-operated  !

I ball valve and check valve were replaced. The sample lines were purged with ,

high pressure air. The auxiliary and low flow pumps were replaced. The i

mid/high range pump was replaced; however, the replacement pump was received j directly from the manufacturer and is not environmentally qualified. The new l mid/high range pump enables the VRGM to pass its functional test; thus, the root cause of the WRGM inoperability has been attributed to the old mid/high range pump which could no longer achieve the required flow. Four mid/high range pumps which are environmentally qualified are currently on order. It would normally take approximately 26 weeks to receive the new pumps; however, an effort is being made to expedite this process or environmentally qualify the installed pump.

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Since the monitor could not be returncd to service within seven days (July 26,-1988, to August 2,1988), this report is submitted pursuant to TS , 3.3.3.1 and 6.9.2. Since HP personnel have an alternate method of monitoring plant stack activity and the probability of an accident'which would require use of the monitor is extremely low, the inoperability of the WRGM does not pose a. health hazard to the general public.

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

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