ML17306A452
| 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 chemistry personnel could not,obtain sample. Caused by malfunctioning flow to be returned to an operable status DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR TITLE: 50.73/50.9 Licensee Event Report (LER)
NOTES:Standardized plant.
I inoperabl'e when a containment air sensor. PASS expected
.W/920207 ltr.
ENCL SIZE:
ncident Rpt, etc.
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05000529 RECIPIENT ID CODE/NAME PD5 LA TRAMMELL,C INTERNAL: ACNW AEOD/DOA AEOD/ROAB/DSP NRR/DET/EMEB 7E NRR/DLPQ/LPEB10 NRR/DREP/PRPB11 NRR/DST/SICB8H3 NRR/DST/SRXB 8E
'ES/DSIR/EIB EXTERNAL: EGGG BRYCE,J.H NRC PDR, NSIC POORE1W NOTES:
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1 RECIPIENT ID CODE/NAME PD5 PD THOMPSON,M ACRS AEOD/DSP/TPAB NRR/DET/ECMB 9H NRR/DLPQ/LHFB10 NRR/DOEA/OEAB NRR/DST/SELB 8D N
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NOTE TO ALL"RIDS" RECIPIENTS:
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PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAMEFROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
5 FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED:
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0
Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034
~
PHOENIX. ARIZONA85072-2034 JAMES M. LEVINE VICE PRESIDENT NUCLEAR PRODUCTION 192-00771-JML/TRB/RKR February 7,
1992 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 have any questions, please contact T. R. Bradish, Compliance
- Manager, at (602) 393'-2521.
Very truly yours, JML/TRB/RKR/dmn Attachment cc:
W. F.
Conway J.
B. Martin D. H.
Coe (all with attachment) 9202140005 920207 PDR ADOCK 05000529 S
+g Z.2.
III
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 Page 2
Special Report 2-SR-92-001 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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