ML17304A504

Special Rept 1-SR-88-007:on 880815,radiation Monitoring Unit Inoperable for Greater than 72 H,Per Tech Specs 6.9.2 & 3.3.3.8.Channel Source Rod Arm Slide Cam Was Binding on Metal Canister.Slide Cam Reworked to Prevent Binding

ML17304A504
Person / Time
Site:	Palo Verde
Issue date:	08/31/1988
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
1-SR-88-007, 1-SR-88-7, 192-00407-JGH-T, 192-407-JGH-T, NUDOCS 8809140167
Download: ML17304A504 (5)

Text

,, P'FTZM

"+SUCCESSION NBR:8809140167 DOC.DATE: 88/08/31 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 AUTH. NAME AUTHOR AFFILIATION HAYNESKJ.G. Arizona Nuclear Power Project (formerly Arizona Public Serv RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 1-SR-88-007:on 880815,radiation monitoring unit inoperable for greater than 72 h.

R DISTRIBUTION CODE'E22D COPIES RECEIVED:LTR i ENCL i SIZE:

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

NOTES:Standardized plant. 05000528 S

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 LICITRAPE 1 1 DAVIS,M 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DSP/NAS 1 '1 AEOD/DSP/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 l. 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/DOEA/EAB ll NRR/DLPQ/HFB 10 NRR/DREP/RPB 10 1

1 2

1 1

2 NRR/DLPQ/QAB NRR/DREP/RAB NRR/DR 10 10 IB 9A 1

1 1

1 1

1 NUDOCS-ABSTRACT 1 1 LE 02 1 1-RES TELFORDKJ 1 1 RES DSIR DEPY 1 1 RES/DSIR/EIB 1 1 RGN5 FIL'E 01 1 1 EXTERNAL: EG&G WILLIAMSPS 4 4 FORD BLDG HOYKA 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRISKJ 1 1 NSIC MAYS,G 1 1 NOTES: 1 1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 48 ENCL 47

Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX, ARIZONA85072-2034 192-00407-JGH/TDS/JEH August 31, 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-88-007 File: 88-020-404 Attached please find Special Report 1-SR-88-007 prepared and submitted pursuant to Technical Specifications 3.3.3.8 ACTION 42b and 6.9.2. This report discusses a radiation monitor 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 Hanager at (602) 393-2521.

Very tru y yours, J. G. Haynes Vice President Nuclear Production JGH/TDS/JEH/kj Attachment cc: D. B. Karner (all w/a)

E. E. Van Brunt, Jr.

J. B. Hartin T. J. Polich H. J. Davis A. C. Gehr INPO Records Center 8809140167 05000528 88083'DR ADOCW 8 PNU

f PALO VERDE NUCLEAR GENERATING STATION Radiation Monitoring Unit Inoperable for Greater Than 72 Hours License No. NPF-41 Docket No. STN 50-528 Special Report No. 1-SR-88-007 This Special Report is being submitted pursuant to Technical Specification (TS) 3.3.3 ' ACTION 42b and Technical Specification 6.9.2 to report an event in which the Radioactive Gaseous Effluent Monitor (Plant Vent High Range Gaseous Activity Monitor RU-144) 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-hour limit for returning to operability was exceeded at 1123 HST on August 18, 1988. Pursuant to Technical Specification 3.3.3.8 ACTION 42a the Preplanned Alternate Sampling Program was initiated to monitor the Plant Vent System.

At 1123 HST on August 15, 1988, Palo Verde Unit 1 was in Mode 3 (HOT STANDBY) with the average Reactor Coolant System temperature at approximately 569 degrees F.and Pressurizer Pressure at 2250 psia when RU-144 (Plant Vent System Radioactive Gaseous Effluent Monitor high range) was declared inoperable.

Surveillance Test 75ST-9ZZ08 (Effluent Monitor Monthly Source Check) was being performed when the source check for channels 1 and 2 of RU-144 would not meet the established surveillance criteria.

An authorized work document was issued to troubleshoot and rework/replace as necessary to correct the problem which caused the source check to fail the surveillance test. Troubleshooting identified that the channel 1 source rod arm"s slide cam was binding on the metal canister that surrounds the detector. The slide cam was reworked so it wound not bind. On the channel 2 detector a broken solenoid coil wire was identified, and the detector was replaced.

The new channel 2 detector was being calibrated in accordance with 36ST-9S(10 "RU-143/RU-144 Calibration Test" when a faulty 24 volt power supply, was identified. The faulty power supply was replaced with a new power supply and the calibration test was completed satisfactorily. Appropriate surveillance testing was performed satisfactorily and RU-144 was returned to an operable status at 1345 HST on August 22, 1988. The monitor was inoperable for 7 days, 2 hours and 22 minutes.