ML17305B101

Special Rept 1-SR-90-006:on 900905,radiation Monitor Inoperable for More than 72 H.Caused by End of Life Failure of Blower Fan.Blower Replaced & Test Procedure Revised to Include Appropriate Acceptance Criteria

ML17305B101
Person / Time
Site:	Palo Verde
Issue date:	10/03/1990
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1-SR-90-006, 1-SR-90-6, NUDOCS 9010150197
Download: ML17305B101 (6)

Text

P.CCELERATED DIRIBUTION DEMONS~TION SYSTEM I

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RXDS)

ACCESSION NBR:9010150197 DOC.DATE: 90/10/03 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 RECXPIENT AFFILIATION Do'cument Control Branch (Document Control Desk)

SUBJECT:

Special Rept 1-SR-90-006:on 900905,radiation monitor inoperable for more than 72 h.

D DISTRI BUTXON CODE XE2 2 D COPI ES RECE IVED LTR

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TITLE: 50.73/50.,9 Licensee Event Report (LER), Incident Rpt, etc. S NOTES:STANDARDXZED PLANT 05000528 RECIPXENT RECIPIENT COPIES A ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 D PETERSON,S. 1 1 TRAMMELL,C. 1 1 D'

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/LHFB11 1 1 NOTES'OPIES NRR/DLPQ/LPEB10 NRR/DREP/PRPB11 NRR/DST/SICB 7E 1

2 1

1 2

1 NRR/DOEA/OEAB11 NRR/DST/SELB 8D RR/'D SPLB8Dl 1

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1 NRR/DST/SRXB 8E 1 1 ~G FI LE 02 1 1 RES/DSIR/EIB 1 1 RGN ILE 01 1 1 EXTERNAL EG&G BRYCE i J ~ H 3 3 L ST LOBBY WARD 1 1 NRC PDR 1 1 'NSIC MAYS,G 1 1 NSIC MURPHY,G.A 1 1 NUDOCS FULL TXT 1 1 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

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

TOTAL NUMBER OF COPXES REQUIRED: LTTR 35 ENCL 35

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Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O, BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 192-00697-JML/TRB/SBJ JAMES M. LEVINE VICE PRESIDENT October 3, 1990 NUCLEAR PRODUCTION U. S. Nuclear Regulatory Commission Attention: NRC Document Control Desk Mail Station: Pl-37 Washington, D.C. 20555

Dear Sirs:

Subj ect: Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528 (License No. NPF-41)

Special Report 1-SR-90-006 File'0-020-404 Attached please find Special Report 1-SR-90-006 prepared and submitted pursuant to Technical Specifications 3.3.3.1 ACTION 27 and 6.9.2. This-report discusses the Containment Building Atmosphere Radiation Monitor being inoperable for a period 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 yours, Il JML/TRB/SBJ/dmn Attachment cc: W. F. Conway (all w/attachment)

J. B. Martin D. H. Coe A. C. Gehr A. H. Gutterman INPO Records Center 9I.) ].003 9O] Oi~<( 19 J" (OIgsl7

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PDR ADQCK PD-DP 8

PALO VERDE NUCLEAR GENERATING STATION UNIT 1 Radiation Monitor Inoperable License No. NPF-41 Docket No. 50-528 Special Report 1-SR-90-006 Initial Conditions'n September 5, 1990 Palo Verde Unit 1 was in Mode 1 (POWER OPERATION) at approximately 100 percent power.

Descri tion of Event This Special Report is being submitted pursuant to Technical Specification 3.3.3.1 ACTION 27 and Technical Specification 6.9.2 to report an event in which the Containment Building Atmosphere Radiation Monitor (RU-1) was inoperable for a period greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The

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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 1937 MST on September 5, 1990.

On September 2, 1990 at approximately 1937 MST, the Containment Building Atmosphere Radiation Monitor (RU-1) was declared inoperable to investigate noise coming from the radiation monitor blower. RU-1 continuously moni'tors the containment atmosphere for particulate and gaseous activity to provide a qualitative indication of an increase in primary coolant system leakage. A portable radiation monitor was installed to continuously sample containment air and grab sampling initiated in accordance with Technical Specifications.

Cause of Event:

The cause of RU-1 being inoperable was an end of life failure of the blower fan.

The radiation monitor could not be returned to service within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> because of material and procedural problems. The replacement blower supplied was a different model number than the original blower. Because of this, a different size taper bushing was required. There were no taper bushings of the required size in the warehouse, therefore, a taper bushing was taken from a non-Technical Specification radiation monitor.

When the radiation monitor was reassembled, the air flow required by the test procedure could not be obtained. An evaluation of the procedural requirements found them to be inconsistent with design requirements.

NRC Document Control Desk Special Report 1-SR-90-006 Page 2 Corrective Actions The blower was replaced. The test procedure was revised to include appropriate acceptance criteria consistent with design requirements.

The surveillance test was successfully performed and the radiation monitor declared operable at approximately 0613 MST on September ll, 1990.

An investigation into the procedural and material problems is in progress and should be completed by October 31, 1990. A supplement to the report will be submitted if the investigation identifies any different contributing factors.

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