ML17303B026

Special Rept 1-SR-88-004:on 880407,loose Part Detection Instrumentation Declared Inoperable for More than 30 Days. Caused by Breakup of Signal Coming from Sensor.Work Control Document Prepared & Will Be Scheduled for Next Outage

ML17303B026
Person / Time
Site:	Palo Verde
Issue date:	04/12/1988
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
1-SR-88-004, 1-SR-88-4, 192-00365-JGH-T, 192-365-JGH-T, NUDOCS 8804190029
Download: ML17303B026 (4)

Text

i~g CEZZRATZD M JBUTION DEMONS QON SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:8804190029 DOC.DATE: 88/04/12 NOTARIZED:

NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 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 1-SR-88-004:on 880407,loose part detection instrumentation inoperable for more than 30 days.DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL SIZE: TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.NOTES:Standardized plant.05000528~RECIPIENT ID CODE/NAME PD5 LA LICITRA,E INTERNAL: ACRS MICHELSON AEOD/DOA AEOD/DSP/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 S SIB 9A REG FIL 02 SfDE" RGN5 FILE 01 EXTERNAL: EGG(G GROH, M H ST LOBBY WARD NRC PDR NSIC MAYS,G NOTES COPIES LTTR ENCL 1 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 NRR/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 S A D'D TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46 Arizona Nuclear Power Project P.O.BOX 52034~PHOENIX.ARIZONA 85072-2034 192-00365-JGH/TDS/JEN April 12, 1988 U.S.Nuclear Regulatory Commission NRC Document Control Desk Washington, D.C.20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)Unit 1 Docket No.STN 50-528 (License No.NPF-41)Special Report 1-SR-88-004.File: 88-020-404 Attached please find Special Report 1-SR-88-004 prepared and submitted pursuant to Technical Specification 3.3.3.7 ACTION a and Technical Specification 6.9.2.This report discusses the loose-part detection instrumentation being inoperable for more than 30 days.If you have any questions,'lease contact T.D.Shriver, Compliance flanager at (602)393-2521.Very trul yours, JGH/TDS/JEH/kj Attachment cc: 0.H.Def1ichele E.E.Van Brunt, Jr.J.B.Har tin T.J.Polich E.A.Licitra A.C.Gehr INPO Records Center (all w/a)J.G.Hay es Vice President Nuclear Production 8804190029 8804i2 PDR ADOCK 05000528 DCD,.

PALO VERDE NUCLEAR GENERATING STATION LOOSE-PART DETECTION INSTRUHENTATION License No.NPF-41 Docket No.50-528 Special Report No.1-SR-88-004 This Special Report is being submitted pursuant to Technical Specification 3.3.3.7 ACTION"a" and Technical Specification 6.9.2'addressing the loose-part detection instrumentation being inoperable for more than 30 days.The 30 day period for returning the system to an operable status was exceeded at approximately 0010 HST on April 7, 1988.Palo Verde Unit 1 entered Hode 2 (STARTUP)at approximately 0010 HST on Harch 8, 1988 upon completion of its first refueling outage.The inoperable portion'of the loose-part detection instrumentation is in the circuitry associated with instrument number JSVNYE-2, which is located on the upper reactor vessel head.The inoperable status is caused by a break-up of the signal coming from the sensor.The sensor and the hardline cable had been replaced as discussed in letter ANPP-36011-EEVB/KLH-98.05, E.E.Van Brunt, Jr.to Director of Nuclear Reactor Regulation, dated April 9, 1986.Surveillance Test 36ST-9SV02 (Vibration and Loose Parts Honitoring System Calibration Test)was performed satisfactorily on loose-part detection instrumentation in January, 1988.The reactor vessel head was removed for inspection and maintenance and reinstalled in February, 1988.On triarch 4, 1988 the loose-part detection instrumentation channel 2 problem was identified and is believed to be.either the sensor or the cable although an exact root cause has not been determined.

An authorized work control document has been prepared and will be scheduled for the next outage of sufficient duration.