ML17313A992

Special Rept:On 990525,RMS mini-computer Was Removed from Service to Implement Yr 2000 Mod & Was OOS Longer than 72 H Allowed.Caused by Planned Y2K Mods.Preplanned Alternate Sampling Program Was Initiated

ML17313A992
Person / Time
Site:	Palo Verde
Issue date:	06/21/1999
From:	Overbeck G ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-01050-GRO-D, 192-1050-GRO-D, NUDOCS 9906290040
Download: ML17313A992 (10)

Text

CATEGORY 1, REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9906290040 DOC.DATE: 99/06/21 NOTARIZED: NO DOCKET'0

, FACIL:STN-50-.529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 AUTH. NAME AUTHOR AFFILIATION OVERBECK,G.R. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP . NAME RECIPIENT AFFILIATION Records Management Branch (Document Control Desk)

SUBJECT:

Special rept:on 990525,RMS mini-computer was removed from service to implement yr 2000 mod & was OOS longer than 72 h allowed. Caused by planned Y2K mods.Preplanned Alternate Sampling Program was initiated.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR i ENCL l SIZE:

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

NOTES:Standardized plant. 05000529 G

RECIPIENT COPIES RECXPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL LPD4-2 1 1 FIELDS,M 1 1 INTERNAL: ACR S 1 AEOD/SPD/RRAB 1 1 E CENTE 1 NRR/DIPM/IOLB 1 1 D PM/XQMB 1 NRR/DRIP/REXB 1 1 NRR/DSSA/SPLB 1 RES/DET/EIB 1 1 RGN4 FILE 01 1 EXTERNAL: L ST LOBBY WARD 1 1 LMITCO MARSHALL 1 1 NOAC POORE,W. 1 1 NOAC QUEENER,DS 1 1 D NRC PDR 1 1 NUDOCS FULL TXT 1 1 M

'E WASTETH NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 17 ENCL 17 t

1 Greg g R. Overbeck Mail Station 7602 Palo Verde Nuclear Vice President TEL 602I3934146 P.O. Box 52034 Generating Station Nuclear Producthn FAX 602I3934077 Phoenbr, AZ 85072-2034 192-01050-GRO/DGM June 21, 1999

't U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, D.C. 20555-0001

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 2 Docket No. STN 60-629 Special Report 24R-99-003 Attached please find Special Report 2-SR-99-003 prepared and submitted pursuant to the PVNGS Offsite Dose Calculation Manual requirements. This report discusses the inoperability of the plant vent system high range radioactive gaseous effluent monitor and the fuel building ventilation system high range radioactive gaseous effluent monitor for more than seventy-two (72) hours to implement a year 2000 (Y2K) modification.

No commitments are being made to the NRC by this letter.

If you have any questions, please contact Daniel G. Marks, Section Leader, Regulatory Affairs, at (623) 393-6492.

Sincerely, GRO/DGM/dgm Attachment cc: E. W. Merschoff (Region IV) (all with attachment)

P. H. Harrell (Region IV Branch Chief)

M. B. Fields (NRR Project Manager)

J. H. Moorman (Resident Inspector) 9906290040 'P9062i PDR ADOCK 05000529' PDR

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ATTACHMENT Special Report No. 2-SR-99-003

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Palo Verde Nuclear Generating Station Unit 2 Plant Vent and Fuel Building Ventilatio'n Radioactive Gaseous Effluent High Range Monitoring Instrumentation Inoperable Docket No. STN 50-529 Special Report No. 2-SR-99-003 Initial Conditions:

At approximately 0835,MST on May 25, 1999, Palo Verde Unit 2 was in Mode 1 (POWER OPERATION) operating at approximately 100 percent power when the radiation monitoring system (RMS) mini-computer was removed from service to implement a year 2000 (Y2K) modification. Unit 2 operations personnel declared RU-144, the plant vent system high range noble gas activity monitor and RU-146, the fuel building ventilation system high range noble gas activity monitor. INOPERABLE and entered requirement 2.1, ACTION 42 of the Offsite Dose Calculation Manual (ODCM).

The seventy-two (72) hour period for returning the channels to an operable status expired at approximately 0835 MST on May 28, 1999. This Special Report is being submitted pursuant to the ODCM requirement 2.1, ACTION 42(b) to prepare and submit a Special Report to the Commission within 30 days following the event.

Actions Taken:

The Preplanned Alternate Sampling Program for RU-144 to monitor the plant vent was initiated pursuant to the ODCM requirement 2.1, ACTION 42(a) on May 28, 1999 at approximately 0753 MST. The Preplanned Alternate Sampling Program for RU-146 to monitor the fuel building ventilation was initiated pursuant to the ODCM requirement 2.1, ACTION 42(a) on May 28, 1999 at approximately.0725 MST. On May 28, 1999, at approximately 1707 MST, the Y2K modification and testing were completed and the monitors were declared OPERABLE.

Cause of the inoperability:

There was no malfunction associated with the inoperability. The cause of the inoperability was a planned Y2K modification. The contingencies in the event that the duration of the modification exceeded 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> had already been evaluated.

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U. S. Nuclear Regulatory Commission Special Report 2-SR-99-003 Page 2 Plans and Schedule for Restoring the Channels to OPERABLE Status:

On May 28, 1999, at approximately 1707 MST, the Y2K modification and testing were completed and the monitors were declared OPERABLE. The total elapsed time of the inoperability was approximately 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br /> and 32 minutes.

The Y2K modifications to the RMS minicomputer in Units 1 and 3 were completed in less than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.