ML17305A475

Special Rept 2-RS-89-011:on 891204,condenser Evacuation Sys low-range & high-range Radioactive Gaseous Effluent Monitors Declared Inoperable Due to Low Flow Condition & 72 H Limit for Monitor Inoperability Exceeded on 891207

ML17305A475
Person / Time
Site:	Palo Verde
Issue date:	01/08/1990
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-00615-JML-T, 192-615-JML-T, 2-RS-89-011, 2-RS-89-11, NUDOCS 9001180298
Download: ML17305A475 (6)

Text

A.C CE1Z RATED D3&KBUTION DEMONS~A,TION SYFTEg REGULARLY INFORMATION DISTRIBUTI~SYSTEM (RIDS) .

ACCESSION NBR:9001180298 DOC.DATE: 90/01/08 NOTARIZED: NO DOCKET ¹ FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 AUTH. NAME AUTHOR AFFILIATION LEVINE,J.M. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 2-RS-89-011:on 891204 radiation monitors inoperable caused by moisture in Monitor RU-141.

DISTRIBUTION CODE: ZE22D COPIES RECEIVED:LTR TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, 'etc. f ENCL

+ SIZE:

NOTES:Standardized plant. 05000529 S

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 CHAN,T 1 1 DAVIS,M. 1 1 D

INTERNAL: ACRS MICHELSON'CRS 1 1 ACRS MOELLER 2 2 WYLIE 1 1 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 DEDRO 1 1 NRR/DET/ECMB 9H 1 1 NRR/DET/EMEB9H3 1 . 1 NRR/DET/ESGB 8D 1 1 NRR/DLPQ/LHFB11 1 1 NRR/DLPQ/LPEB10 1 1 NRR/DOEA/OEAB11 1 1 NRR/DREP/PRPB11 2 2 NRR/DST/SELB 8D 1 1 NRR/DST/SICB 7E 1 1 NRR/DST/SPLB8D1 1 1 NRR/DST/SRXB 8E 1 1 NUDOCS-ABSTRACT 1 1 1 1 RES/DSIR/EIB 1 1 RGN5 FILE 01' 1 1 EXTERNAL EGGG WILLIAMS i S 4 4 ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR- 1 1 NSIC MAYSiG 1 1 NSIC MURPHY,G.A 1 1 NUDOCS FULL TXT 1 1 R NOTES: 1 1 D

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NCTE 'IO ALL "RIDS" RECIPZEZIS:

S PLEASE HELP US 'IO REDUCE HASTE.'ORI'ACI'IHE DOCXMKZ CXÃIBDL DESK, RXN Pl-37 (EXT. 20079) TO XZIIMINAXRKKR NAME PRCH DISTIGBVI!ICN LISTS PQR DOCUMENTS YOU DCNiT NEEDf TOTAL NUMBER OF COPIES REQUIRED: LTTR 40 ENCL 40

Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O, BOX 52034 ~ PHOENIX, ARIZONA85072-2034 192-00615-JML/TRB/RKR JAMES M. LEVINE VICE PRESIDENT January 8, 1990 NUCLEAR PRODUCTION U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Dear Sirs:

Subj ect: Palo Verde Nuclear Generating Station (PVNGS)

Unit 2 Docket No. STN 50-529 (License No. NPF-51)

Special Report 2-SR-89-011 ile'9-020-404 Attached please find Special Report 2-SR-89-011 prepared and submitted pursuant to Technical Specifications 3.3.3.8 ACTION 42.b 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. R. Bradish, Compliance Supervisor at (602) 393-3531.

Very truly yours, JML/TRB/RKR/kj Attachment cc: W. F. Conway (all w/a)

J. B. Martin E. E. Van Brunt:

T. J. Polich M. J. Davis A. C. Gehr

%00 i i 80298 900108 05000529 PDR ADQCK S PNU

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PALO VERDE NUCLEAR GENERATING STATION Radiation Monitor Inoperable for Greater than 72 Hours License No. NPF-51 Docket No. STN 50-529 Special Report No. 2-SR-89-011 This Special Report is submitted in accordance with Technical Specifications 3.3.3.8 ACTION 42.b and 6.9.2 to report an event in which the Condenser Evacuation System Low Range and High Range Radioactive Gaseous Effluent Monitors (RU-141 and RU-142) were 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 was exceeded at approximately 0405 MST on December 7, 1989.

At approximately 1405 MST on December 4, 1989, Palo Verde Unit 2 was in Mode 1 (POWER OPERATION) at approximately 100 percent power when the Condenser Evacuation System Low Range and High Range Radioactive Gaseous Effluent Monitors were declared inoperable due to a low flow condition on monitor RU-141. The problem was discovered by control room personnel when they observed a continuous 1'ow flow alarm for RU-141. Pursuant to Technical Specification 3.3.3.8 ACTION 42.a the Preplanned Alternate Sampling Program was initiated to monitor the appropriate'arameters.

Monitors RU-141 and RU-142 work as a pair with RU-141 being the low range monitor and RU-142 being the high range monitor. Normal configuration consists of RU-141 operating and RU-142 in standby. When RU-141 reaches a predetermined level, RU-142 starts and RU-141 goes to standby. Since RU-141 is inoperable, RU-142 must also be declared inoperable.

An authorized work document was issued to troubleshoot and rework or replace components as necessary to correct the low flow condition. The initial investigation revealed that the cause of the low flow condition was due to moisture in the monitor. A modification is being developed to correct this problem. The modification removes a moisture separator, relocates the temperature probe for the heat trace from the inlet to the outlet of the monitor, and adds additional heat trace to the monitor.

The modification is being tested in Unit 3. If the test demonstrates that the modification is effective, the modification will then be implemented three units. Unit 1 will implement the modification prior to startup from in'll the current outage. Unit 2 will implement the modification prior to startup from the upcoming refueling outage.

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