ML17303B053

Special Rept 3-SR-88-002:on 880328,radiation Monitoring Unit Inoperable for Greater than 72 H Due to Unsatisfactory Performance of Source Check.Caused by Excessive High Voltage from Faulty High Voltage Board.Detector Replaced

ML17303B053
Person / Time
Site:	Palo Verde
Issue date:	04/18/1988
From:	HAYNES J G ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00367-JGH-T, 192-367-JGH-T, 3-SR-88-002, 3-SR-88-2, NUDOCS 8804210329
Download: ML17303B053 (6)

Text

j I P'gCELERATED DISOIBUTION DEMONSTRION SYSTEM ,'l.REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:8804210329 DOC.DATE: 88/04/18 NOTARIZED:

NO DOCKET FACIL:STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH.NAME AUTHOR AFFILIATION HAYNES,J.G.

Arizona Nuclear Power Project (formerly Arizona Public Serv RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 3-SR-88-002:on 880328,radiation monitoring unit inoperable for greater than 72 h.DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR I ENCL P SIZE: TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.NOTES:Standardized plant.RECIPIENT ID CODE/NAME PD5 LA LICITRA,E INTERNAL ACRS MICHELSON AEOD/DOA AEOD/DS P/ROAB ARM/DCTS/DAB NRR/DEST/ADS 7E NRR/DEST/ESB 8D NRR/DEST/MEB 9H NRR/DEST/PSB 8D NRR/DEST/SGB 8D NRR/DLPQ/QAB 10 NRR/DREP/RAB 10 RGN5 FILE 01 EXTERNAL: EG&G GROH,M H ST LOBBY WARD NRC PDR NSIC MAYS,G NOTES: COPIES LTTR ENCL.1 1, 1 1'1 1 1 2 2 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4 4 1 1 1 1 1 1 1 1 RECIPIENT ID CODE/NAME PD5 PD DAVIS,M ACRS MOELLER AEOD/DSP/NAS AEOD/DSP/TPAB DEDRO NRR/DEST/CEB 8H NRR/DEST/ICSB 7 NRR/DEST/MTB 9H NRR/DEST/RSB 8E NRR/DLPQ/HFB 10 NRR/DOEA/EAB 11 NRR/DREP/RPB 10'RR/PMAS/ILRB12 RES TELFORD,J RES/DRPS DIR FORD BLDG HOY,A LPDR NSIC HARRIS,J COPIES LTTR ENCL 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1, 1 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 D 05000530 S 1'D S j A TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46

Arizona Nuclear Power Project P.O.BOX 52034~PHOENIX.ARIZONA 85072-2034 192-00367-JGH/TDS/DAJ April 18, 1988 U.S.Nuclear Regulatory Commission NRC Documen'ontrol Desk Washington, D.C.20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)Unit 3 Docket No.STN 50-530 (License No.NPF-74)Special Report 3-SR-88-002 File: 88-020-404 Attached please find Special Report 3-SR-88-002 prepared and submitted pursuant to Technical Specification 3.3.3.8 ACTION 42b and Technical Specification 6.9.2.This report discusses a radiation monitoring unit inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.If you have any questions, please contact T.D.Shriver, Compliance Manager at (602)393-2521.Very trul yours, JGH/TDS/DAJ/kj Attachment cc: 0.M.DeMichele (all w/a)E.E.Van Brunt, Jr.J.B.Martin T.J.Po 1 i ch E.A.Licitra A.C.Gehr INPO Records Center J.G.Hay<(es Vice President Nuclear Production

~pg.'Z])8804210329 880418 PDR ADOCK 05000530 S DCD

ALO VERDE NUCLEAR GENERATING S ION Radiation Monitoring Unit Inoperable for Greater Than 72 Hours License No.NPF-74 Docket No.STN 50-530 Special Report No.3-SR-88-002 This Special Report is being submitted pursuant to Technical Specification 3.3.3.8 ACTION 42b and Technical Specification 6.9.2 to report an event in which a Radioactive Gaseous Effluent Monitor (Fuel Building Ventilation System High Range Monitor RU-146)was inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit for returning the monitor to operability was exceeded at approximately 0100 MST on March 31, 1988.Pursuant to Technical Specification 3.3.3.8 ACTION 42a the Preplanned Alternate Sampling Program was initiated to monitor the Fuel Building Ventilation System when needed.At 0100 MST on March 28, 1988, Palo Verde Unit 3 was in Mode 1 (POWER OPERATION) when the.Fuel Building Ventilation System High Range Monitor RU-146 was declared inoperable due to unsatisfactory performance of the source check while performing surveillance test 75ST-9ZZ08 (Effluent Monitor Monthly Source Check).An authorized work document was issued to troubleshoot/rework/replace components to correct the cause of the monitor not passing the check source surveillance on channel 2.During troubleshooting a Detector High Voltage Failure alarm and a Detector Failure alarm were received.The high voltage was found to be approximately 2.5 times greater than the normal value.The high voltage board was replaced with a replacement high voltage board and the voltage adjusted to a normal value.The detector is believed to have failed'due to the excessive high voltage from the faulty high voltage board.The detector was replaced with a new detector and surveillance test 36ST-9Sgll (RU-145/RU-146 Calibration Test)was satisfactorily performed on RU-146 channel 2.An Engineering Evaluation Request has been submitted to perform a root cause of failure analysis on the malfunctioning components.

After satisfactory completion of appropriate surveillance tests RU-146 was declared operable at 1357 MST on April 1, 1988.The monitor was out of service for'approximately 4 days and 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />.