ML17303B079

Special Rept 2-SR-88-004:on 880324,radioactive Gaseous Effluent Monitors Inoperable for More than 72 H.Authorized Work Document Issued to Implement Plant Change Package for Monitor RU-143 & to Change Default Parameters

ML17303B079
Person / Time
Site:	Palo Verde
Issue date:	04/22/1988
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00371-JGH-T, 192-371-JGH-T, 2-SR-88-004, 2-SR-88-4, NUDOCS 8805020155
Download: ML17303B079 (6)

Text

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~ AC CELEMTZD DISTRIBUTION DEMONSTRATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8805020155 DOC.DATE: 88/04/22 NOTARIZED: NO DOCKET FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 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 2-SR-88-004:on 880324,radioactive gaseous effluent monitors inoperable for more than 72 h.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR TITLE: 50.73 Licensee Event Report (LER),

( ENCL i SIZE:

Incident Rpt, etc.

~

I NOTES:Standardized plant. 05000529 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 LICITRA,E 1 1 DAVIS,M 1 1 A

INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DS P/NAS 1 1 AEOD/DSP/ROAB 2 2 AEOD/DSP/TPAB 1 1 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEBT/ADS 7E 1 0 NRR/DFST/CEB 8H 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 3. 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 1 1 NRR/DLPQ/QAB 10 1 1 NRR/DOEA/EAB 11 1 1 NRR/DREP/RAB 10 1 1 NRR/DREP/RPB 10 2 2

/DRI IB 9A 1 1 NRR/PMAS/ILRB12 1 1 RE FILE 02 1 1 RES TELFORD,J 1 1 X8/DE EIB 1 1 RES/DRPS DIR 1 1 RGN5 FILE 01 1 1' EXTERNAL: EG&G GROH,M 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 MAYS,G 1 1 R t

NOTES: 1 1 j

A TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46

Arizona Nuclear Power Project P,O. BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 192-00371-JGH/TDS/JEH Apri 1 22, 1988 U. S. Nuclear Regulatory Commission NRC Document Control Desk Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

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

Special Report 2-SR-88-004 File: 88-020-404 Attached please find Special Report 2-SR-88-004 prepared and submitted pursuant to Technical Specification 3.3.3.8 ACTION 42b and Technical Specification 6.9.2. This report discusses a radiation monitoring unit

-4noperabl"- o, 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, vK J. G. Haynes Vice President Nuclear Production JGH/TDS/JEH/kj Attachment cc: 0. H. DeHichele (all w/a)

E. E. Van Brunt, Jr .

J. B. Hartin T. J. Polich E. A. Licitra A. C. Gehr INPO Records Center 8805020155 880422 PDR ADOCK 05000529 8 DCD

PALO VERDE NUCLEAR GENERATING STATION Radiation Monitoring Unit Inoperable for Greater Than 72 Hours License No. NPF-51 Docket No. STN 50-529 Special Report No. 2-SR-88-003 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 Radioactive Gaseous Effluent Monitors (Fuel Building Ventilation System Low Range Monitor RU-145 and High Range Monitor RU-146) 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 for returning to operability was exceeded at approximately 1630 HST on March 24, 1988. Pursuant to Technical Specification 3.3.3.8 ACTION 42a the Preplanned Alternate Sampling Program was initiated to monitor the Fuel Building Ventilation System when needed.

At 1630 HST on March 21, 1988, Palo Verde Unit 2 was shutdown for its first refueling with the core .offloaded into the Spent Fuel Pool. Radiation Monitors RU-145 and RU-146 were declared inoperable due to continuous low flow alarms on RU-145. Monitors RU-145 and RU-146 work as a pair with RU-145 being the low range monitor and RU-146 being the high range monitor. Normal conf',g.ration consists of RU-145 operating and RU-146 in standby. When RU-145 reaches a predetermined level, RU-146 starts and RU-145 goes to standby.

Since RU-145 and RU-146 work in tandem, both monitors must be declared inoperable if the other malfunctions.

An authorized work document was issued to troubleshoot and rework/replace components to correct the low flow alarms. Troubleshooting identified that the Flow Control Valve (FCV01) was stuck on its seat and the limit switch actuator arm was binding on its drive threads. The valve was manually exercised several times and the limit switch actuator arm was freed up.

Further troubleshooting identified a faulty motor on valve FCVOl. Flow Control Valve (FCV01) was replaced with a new valve and the limit switches were set in accordance with the vendors manual.

During this same time period a Plant Change Package (PCP), to improve the reliability of the Radiation Monitoring System (RHS), was being implemented.

This PCP was incorporating Revision E to the software of RU-145. This revision did not have flow conversion constants needed to establish proper sample flow for a given process flow. The software is expected to be ready for installation by April 26, 1988. After installation of the software and satisfactory completion of required surveillance tests RU-145 and RU-146 are planned to be returned to an operable status by April 29, 1988.

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