ML17305A772
| ML17305A772 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 05/11/1990 |
| From: | James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 1-SR-90-003, 1-SR-90-3, 192-00659-JML-T, 192-659-JML-T, NUDOCS 9005230125 | |
| Download: ML17305A772 (6) | |
Text
ACCELERATED QSTIGBUTION DEMON+RATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9005230125 DOC DATE: 90/05/11 NOTARIZED:
NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 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 1-SR-90-003:on 900421,radiation monitoring unit inoperable greater than 72 h.
DISTRIBUTION CODE:
IE22D COPIES RECEIVED: LTR i ENCL l SIZE:
TITLE: 50.73/50.9 Licensee Event Report (LER), Incident, Rpt, etc.
NOTES 05000528 RECIPIENT ID CODE/NAME PD5 LA PETERSON,S.
INTERNAL: ACNW AEOD/DOA AEOD/ROAB/DSP NRR/DET/ECMB 9H NRR/DLPQ/LHFB11 NRR/DOEA'/OEAB11 NRR/DST/SELB 8D NRR/DST/SPLB8Dl el' RGN5 FILE 01 EXTERNAL EG&G STUARTi V A LPDR NSIC MAYS,G NUDOCS FULL TXT NOTES:
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1 RECIPIENT ID CODE/NAME PD5 PD CHAN,T ACRS AEOD/DSP/TPAB DEDRO NRR/DET/EMEB9H3 NRR/DLPQ/LPEB10 NRR/DREP/PRPBll NRR/DST/SXCB 7E NRR/DST/SRXB 8E RES/DSIR/EIB L ST LOBBY NARD NRC PDR NSXC MURPHY,G.A COPIES LTTR ENCL 1
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NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACTTHE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION-LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUXRED:
LTTR 38 ENCL 38
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PALO VERDE NUCLEARGENERATING STATIC>N P.O. BOX 52034
~
PHOENIX. ARIZONA85072-2034 192-00659-JHL/TRB/SBJ May 11, 1990 U. S. Nuclear Regulatory Commission NRC Document Control Desk Washington, D.C.
20555
Dear Sirs:
Sub] ect:
Palo Verde Nuclear Generating Station (PVNGS)
Unit 1 Docket No.
STN 50-528 (License No. NPF-41)
Special Report 1-SR-90-003 File'0-020-404 Attached please find Special Report 1-SR-90-003 prepared and submitted pursuant to Technical Specifications 3.3.3.8 ACTION 42(b) and 6.9.2.
This report discusses a radiation monitor being 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 Manager, at (602) 393-2521.
Very truly your JML/TRB/SBJ/tlg Attachment cc:
(all w/attachment)
W. F.
Conway J.
B. Martin T. L. Chan D. H.
Coe A. C. Gehr A. L. Gutterman INPO Records Center 900 i280125 PCI0521 PDR ADOCK 05000528 S
t 4
1
PALO VERDE NUCLEAR GENERATING STATION UNIT 1 Radiation Monitoring Unit Inoperable.Greater Than 72 Hours License No. NPF-41 Docket No. 50-528 Special Report 1-SR-90-003 Init a Conditions'n April 21, 1990 Palo Verde Unit 1 was in Mode 3
(HOT STANDBY) with the Reactor Coolant System (RCS) at approximately 1740 pounds per square inch absolute and 379 degrees Fahrenheit.
Descri tion of Event:
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 the Condenser Evacuation System High Range Effluent Monitor (RU-142) was inoperable 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 /> period for returning the monitor to service was exceeded at approximately 0210 MST on April 21, 1990.
On April 18, 1990 at approximately 0210 MST, RU-142 was declared inoperable as a result of the Condenser Evacuation System Low Range Effluent Monitor (RU-141) being declared inoperable because of unstable sample flow.
The low range 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 scenarios.
RU-142 must be declared inoperable when RU-141 is inoperable.
Cause of Event'n approved work document was initiated to troubleshoot the cause of the unstable sample flow.
The troubleshooting determined the cause of the unstable sample flow to be moisture accumulation in the flow element.
Corrective Actions The moisture accumulation was eliminated by the addition of heat tracing and insulation to the flow element, flow control valve, and associated tubing.
RU-141 and 142 were declared operable on April 23, 1990 at approximately 1907 MST.
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