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 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)

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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.

SIZE:

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR I ENCL P

TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.

D NOTES:Standardized plant. 05000530 S

RECIPIENT COPIES RECIPIENT COPIES 1'

ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA .1 1, 1' PD5 PD 1 1 LICITRA,E 1 DAVIS,M 1 1 INTERNAL ACRS MICHELSON 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DSP/NAS 1 1 AEOD/DS P/ROAB 2 2 AEOD/DSP/TPAB 1 1 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSB 8D 1 1 NRR/DEST/RSB 8E 1, 1 NRR/DEST/SGB 8D 1 1 NRR/DLPQ/HFB 10 1 1 NRR/DLPQ/QAB 10 1 1 NRR/DOEA/EAB 11 1 1 NRR/DREP/RAB 10 1 1 NRR/DREP/RPB 10 2 2 1 1 'RR/PMAS/ILRB12 1 1 1 1 RES TELFORD,J 1 1 1 1 RES/DRPS DIR 1 1 RGN5 FILE 01 1 1 EXTERNAL: EG&G GROH,M 4 4 FORD BLDG HOY,A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRIS,J 1 1 NSIC MAYS,G 1 1 NOTES: 1 1 D

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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, J. G. Hay<(es Vice President Nuclear Production 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

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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 hours.