ML17306A452

Special Rept:On 920101,PASS Declared Inoperable When Chemistry Personnel Could Not Obtain a Containment Air Sample.Caused by Malfunctioning Flow Sensor.Pass Expected to Be Returned to an Operable status.W/920207 Ltr

ML17306A452
Person / Time
Site:	Palo Verde
Issue date:	02/07/1992
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-00771-JML, 192-771-JML, NUDOCS 9202140005
Download: ML17306A452 (8)

Text

ACCELERATED 'Dj TRIBUTION DEMONS TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9202140005 DOC.DATE: 92/02/07 NOTARIZED: NO DOCKET 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:on 920101,PASS declared inoperabl'e when chemistry personnel could not,obtain a containment air sample. Caused by malfunctioning flow sensor. PASS expected to be returned to an operable status .W/920207 ltr. D S

DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER) ncident Rpt, etc. /

NOTES:Standardized plant. 05000529 I

RECIPIENT COPIES RECIPIENT COPIES D ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 ~ 1 D TRAMMELL,C 1 1 THOMPSON,M 1 1 INTERNAL: ACNW 2 2 ACRS 2 2 AEOD/DOA 1 1 AEOD/DS P/TPAB 1 1 AEOD/ROAB/DS P 2 2 NRR/DET/ECMB 9H 1 1 NRR/DET/EMEB 7E 1 1 NRR/DLPQ/LHFB10 1 1 NRR/DLPQ/LPEB10 1 1 NRR/DOEA/OEAB 1 1 NRR/DREP/PRPB11 2 2 NRR/DST/SELB 8D 1 1 NRR/DST/SICB8H3 1 1 N PLB8D1 1 1 NRR/DST/SRXB 8E 1 1 EG FILE 02 1 1

'ES/DSIR/EIB 1 1 RG E 01 1 1 EXTERNAL: EGGG BRYCE,J.H 3 3 L ST LOBBY WARD 1 1 NRC PDR, 1 1 I NS C MURPHY i G ~ A 1 1 NSIC POORE1W 1 1 NUDOCS FULL TXT 1 1 NOTES:

D D

D NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

5 FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 35 ENCL 35

0 Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034 ~ PHOENIX. ARIZONA 85072-2034 JAMES M. LEVINE 192-00771-JML/TRB/RKR VICE PRESIDENT February 7, 1992 NUCLEAR PRODUCTION U. S. Nuclear Regulatory Commission Attention: Document Control Desk Mail Station Pl-37 Washington, D,C. 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-92-001 File 92-020-404 Attached please find Special Report 2-SR-92-001 prepared and submitted pursuant to Technical Specifications 3.3.3.1 ACTION 28 and 6.9.2. This report discusses the Post Accident Sampling System being inoperable for greater than seven (7) days. We are forwarding a copy of the Special Report to the Regional Administrator of the Region V office.

If you have393'-2521.

any questions, please contact T. R. Bradish, Compliance Manager, at (602)

Very truly yours, JML/TRB/RKR/dmn Attachment cc: W. F. Conway (all with attachment)

J. B. Martin D. H. Coe 9202140005 920207 +g Z.2.

PDR S

ADOCK 05000529 II I PDR

PALO VERDE NUCLEAR GENERATING STATION UNIT 2 Post Accident Sampling System Inoperable Greater Than 7 Days License No. NPF Docket No. 50-529

, Special, Report 2-SR-92-001.

Initial Conditions:

This Special Report is being submitted pursuant to Technical Specification (TS) 3.3.3.1 ACTION 28 and TS 6.9.2 to report an event in which the Post Accident Sampling System (PASS) was inoperable for a period greater than 7 days. The 7 day period for returning PASS to service was exceeded at approximately 0217 MST on January 8, 1992. On January 8, 1992, at, 0217 MST, Palo Verde Unit 2 was in Mode,2 (STARTUP) during startup from a refueling outage.

Back round Informatio PASS is designed to sample reactor coolant and containment atmosphere under post accident conditions. The liquid portion of the system provides cooled and depressurized samples as required for analysis. The gas sample portion'of the system provides containment atmosphere samples for analysis.

On January 1, 1992, at approximately 0217 MST, PASS was declared inoperable when chemistry personnel could not obtain a containment air sample in accordance with the surveillance procedure. The Preplanned Alternate Sampling Program was initiated in accordance with TS 3.3.3.1 ACTION 28.

Troubleshooting determined that the cause of the inability to obtain a sample was a malfunctioning flow, sensor. The flow sensor is used to verify that there is actual flow in the sample lines. Verifying flow and recirculating containment atmosphere in the sample lines for a minimum time based on flow ensures that a valid containment atmosphere gas sample is collected for analysis rather than a gas sample from the sample line atmosphere only. The flow sensor was replaced with a spare flow sensor, however the replacement flow sensor also malfunctioned. There were no more spare flow sensors available at PVNGS. The malfunctioning flow sensors were sent to the manufacturer to be rebuilt.

Cause of the Ino erabilit Troubleshooting determined that the cause of the inability to obtain a sample was a malfunctioning flow sensor. The flow sensors are preset'rom the factory. The manufacturer has not provided the information necessary to troubleshoot, rework, and recalibration a malfunctioning flow sensor. This information was considered proprietary by the manufacturer, Therefore, a malfunctioning flow sensor,has to be replaced by a spare flow sensor or sent to the manufacturer for rework and recalibration.

NRC Document Control Desk Special Report 2-SR-92-001 Page 2 Plans and Schedule for Restorin the S stem to Service:

The rebuilt flow sensors are expected back from the manufacturer by February 14, 1992. PASS is expected to be returned to an OPERABLE status within two (2) weeks following receipt of a functioning flow sensor.

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