ML17304B457

Special Rept 2-SR-89-006:on 890817,radiation Monitoring Unit Inoperable for Greater than 72 H.Caused by Monitor Spiking High.Radiation Monitor Calibr Per Approved Procedure & Found to Be within Calibr Requirements

ML17304B457
Person / Time
Site:	Palo Verde
Issue date:	09/12/1989
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-00517-JGH-T, 192-517-JGH-T, 2-SR-89-006, 2-SR-89-6, NUDOCS 8909200251
Download: ML17304B457 (6)

Text

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ACCESSION, NBR:8909200251 DOC.DATE: 89/09/12 NOTARIZED: NO DOCKET FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 AUTH. NAME AUTHOR AFFILIATION HAYNES,J.G. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION

'Document Control Branch (Document Control Desk) F

SUBJECT:

Special Rept 2-SR-89-006:on 890817,radiation monitoring .unit inoperable for greater .than 72 h.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL TITLE: 50.73/50.,9 Licensee Event Report (LER), Incident Rpt, etc.

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Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P 0, BOX 52034 ~ PHOENIX. ARIZONA 85072-2034 192-00517-JGH/TDS/RKR September 12, 1989 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 (Li'cense No. NPF-51)

Special Report 2-SR-89-006 File: 89-020-404 Attached please find Special Report 2-SR-89-006 prepared and submitted pursuant to Technical Specifications 3.3.3. 1 ACTION 27-3 and 6.9.2. This report discusses a radiation monitor 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. D. Shriver, Compliance Manager, at (602) 393-2521.

Very truly yours, J. G. Haynes Vice President Nuclear Production JGH/TDS/RKR/kj Attachment cc: W. F. Conway (all w/a)

D. B.'Karner

'E. E. Van Brunt, Jr.

J. B. Hartin T. J. Polich H. J. Davis A. C. Gehr INPO Records Center

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8909200251 890912 (

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II 4i 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-89-006 This Special Report is being submitted pursuant to Technical .Specification 3.3.3. 1 ACTION,27-3 and Technical Specification 6.9.2 to report an event in which the Containment High 'Range Area Radiation Monitor (RU-149) was 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 the monitor to an operable status was exceeded at approximately 0750 HST on August 17, 1989. Pursuant to Technical Specification 3.3.3. 1 ACTION 27-1 the Preplanned Alternate Program was initiated to monitor the appropriate parameters.

At approximately 0750 HST on August 14,, 1989, Palo Verde Unit 2 was in Mode 1 (POWER OPERATION) at approximately 100 percent power when the Containment Area High Range Radiation Monitor (RU-149) was declared inoperable due to the monitor spiking high. The problem was discovered by Radiation Protection personnel.

An authorized wor k document was issued to troubleshoot and rework or replace components as .necessary. No component problems were identified during troubleshooting. Radiation Monitor RU-149 was calibrated in accordance with an approved procedure and was found to be within the calibration requirements. Radiation Monitor RU-149 indication was observed from approximately 1600 HST on August 18, 1989, .through approximately 0700 HST on August 22, 1989, without any fluctuation or spiking.

Radiation Monitor RU-. 149 was returned to service at approximately 0836 HST on August 22, 1989, following satisfactory completion of the appropriate retesting.

No component failures .were identified. An engineering evaluati'on. of the monitor spiking is being performed. I'f the evaluation identifies additional information which would significantly change the reader's perception of this event, a supplement to this report will be submitted.