ML17304A859

Special Rept 3-SR-88-008:on 881205,high-range Effluent Monitor RU-142 Declared Inoperable as Result of Condenser Evacuation Sys low-range Noble Gas Effluent Monitor Inoperable Due to Erratic Flow.Caused by Water Buildup

ML17304A859
Person / Time
Site:	Palo Verde
Issue date:	12/30/1988
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00439-JGH-T, 192-439-JGH-T, 3-SR-88-008, 3-SR-88-8, NUDOCS 8901130253
Download: ML17304A859 (6)

Text

gccl~RATED D1%'RIBUTtON DEMO'NSTRATION SYSTEM REGULAT INFORMATION DISTRIBUTION+(STEM (RIDE)

F i<i, ACCESSION NBR:8901130253 DOC.DATE: 88/12/30 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:on 881208,3-SR-88-008,CES High Range Efluent monitor RU-142 exceeded 72 h limit of inoperability.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR I ENCL TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.

3 SIZE:

r NOTES:Standardized plant. 05000530 C RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 'PD 1 1 DAVIS,M.J. .1 1 DAVISFM 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEST/ADE 8H 1 1 NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/1CSB 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 10 NRR/DOEA/EAB NRR/DREP/RPB 10 ll 1 1

2 1

1 2

NRR/DLPQ/QAB NRR/DREP/RAB NRR~ IB 10 9A 1

1 1

1 1

1 NUDOCS-ABSTRACT 1 1 EG FIL 02 1 1 RES/DSIR/EIB 1 1 RES DSR/PRAB 1 1 RGN5- FILE 01 1 1 EXTERNAL: EG&G WILLIAMS,S 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 MAYSFG 1 1 NOTES: 1 1 NOZE 'IO ALL RIDS" RECIPIENTS:

PLEASE HELP US TO REZUCE RASTEf CXNZACZ 'IHE DOCGMERZ CONSOL DESK, RXN Pl-37 (EZT. 20079) m EIZMIlRXB 'Y0UR NAHE PKH DISTSIBDTIGN LISTS K)R DOCUMERZS YOU DGH'T NEED(

TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL ., 46

Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX, ARI2ONA 85072-2034

,192-00439-JGH/TDS/DAJ December 30, 1988 U. S. Nuclear Regulatory Commission NRC Document Control 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.-88-008 File: 88-020-404 Attached please find Special Report 3-SR-88-008 prepared and submitted pursuant to Technical Specifications 3.3.3.8 ACTION 42(b) and 6.9.2. This report discusses an inoperable radiation monitoring unit.

If you have .any questions, please contact T. D. Shriver, Compliance Manager at (602) 393-2521.

Very truly yours, J. G. Ha nes Vice President Nuclear Production JGH/TDS/DAJ/kj Attachment cc: D. B. Karner (all w/attachments)

E. E. Van Brunt, Jr.

J. B. Martin T. J. Polich M. J. Davis A. C. Gehr INPO Records Center 8/0 ff 30253 88i 2~3O5~o PDR ADOCK 05O p~U 8

PALO VERDE NUCLEAR GENERATING STATION Radiation Honitoring Inoperable For Greater Than 72 Hours License No. NPF-74 Docket No. STN 50-530 Special Report No. 3-SR-88-008 This Special Report is submitted in accordance with Technical Specification 3.3.3.8 ACTION 42(b) and 6.9.2 for an event in which the Condenser Evacuation System high range effluent monitor (RU-142) 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 inoperability was exceeded at approximately 2150 HST on December 8, 1988. Pursuant to Technical Specification 3.3.3.8 ACTIONS 37 and 40; the Preplanned Alternate Sampling Program (PASP) was initiated at approximately 2150 HST on December 5, 1988.

At approximately 2150 HST on December 5, 1988 RU-142 was declared inoperable as a result of the Condenser Evacuation System low range noble gas effluent monitor (RU-141) being declared inoperable due to erratic flow indication and grab sample"results inconsistent with monitor. indication. Radioactive effluent monitor RU-141 continuously monitors the condenser vacuum pump/gland seal exhaust for gaseous activity, resulting from primary to secondary leakage. Monitors RU-141 and RU-142 work as a pair with RU-141 as the low range monitor and RU-142 as the. high range monitor. Normal configuration consists of RU-141 operating with RU-142 in standby. Low .range monitor RU-141 automatically starts RU-142 and initiates filtration of the condenser vacuum pump/gland seal exhaust whenever the monitor registers a HIGH-HIGH alarm condition. RU-142 is provided for tracking radioactive effluents during postulated accident sc'enarios. RU-142 must be declared inoperable when RU-141 is inoperable.

An approved work document was initiated to troubleshoot the- cause of the erratic RU-141 indication. During troubleshooting, it was identified that the erratic flow indication was caused by excessive water buildup in the water trap and filter line. The liquid caused flow restrictions which resulted in low flow alarms. After removing the water, the appropriate retests were performed and RU-141 was observed to be operating properly. However, RU-141 was not returned to service in order to evaluate and take appropriate a'ction to correct the excessive moisture problem.

ANPP engineering determined that the excessive moisture buildup resulted from condensation of water vapor in the sample stream which was caused by low winter temperatures cooling the sample line. The low ambient temperatures caused the sample stream to cool off which resulted in entrained moisture condensation. In order to correct the moisture condensation, electrical resistance heating was applied to the sample lines. Following the appropriate retests', RU-141 and RU-142 were returned to service at approximately 1637 NST on December 14, 1988. RU-142 was inoperable approximately eight (8) days, nineteen (19) hours.