ML17306A218

Special Rept 2-SR-90-004-01:on 910613,fuel Bldg Ventilation Sys high-range Radioactive Gaseous Effluent Monitor Inoperable for More than 72 H.Caused by Need to Perform 18 Month Surveillance Testing.Monitor Returned to Svc

ML17306A218
Person / Time
Site:	Palo Verde
Issue date:	10/10/1991
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-00746-JML-T, 192-746-JML-T, 2-SR-90-004-01, 2-SR-90-4-1, NUDOCS 9110240017
Download: ML17306A218 (8)

Text

ACCELERATED DISTRIBUTION DEMONS .

TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9110240017 DOC.DATE: 91/10/10 . 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) R

SUBJECT:

Special Rept 2-SR-90-004-01:on 910613,fuel bldg ventilation sys high-range radioactive gaseous effluent monitor inoperable for more than 72 h.Caused by need to perform 18 D month surveillance testing. Monitor returned to svc.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL SIZE:

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

NOTES:Standardized plant. 05000529 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/DSP 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 NRR/DST/SRXB 8E 1

1 1

1 N B~

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1 1

1.

RES/DSIR/EIB 1 1 LE 01 1 1 EXTERNAL: EG&G BRYCE,J.H 3 3 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSIC MURPHYgG A 1 1 NSIC POOREiW 1 1 NUDOCS FULL TXT 1 1 NOTES: 1

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NOTE TO ALL "RIDS" RECIPIENTS:

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

TOTAL NUMBER OF COPIES REQUIRED: LTTR 35 ENCL '35

k Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034 ~ PHOENIX. ARIZONA 85072-2034 192-00746-JML/TRB/RKR JAMES M. LEVINE VICE PRESIDENT October 10, 1991 NUCLEAR PRODUCTION U. S. Nuclear Regulatory Commission Attention: Document Control Desk Mail Station Pl-37 Washington, D.C. 20555

Dear Sirs:

Sub) ect: Palo Verde Nuclear Generating Station (PVNGS)

Unit 2 Docket No. STN 50-529 (License No. NPF-51)

Special Report 2-SR-90-004-01 F le'1-020-404 Attached please find Supplement l to Special Report 2-SR-90-004 prepared and submitted pursuant to Technical Specifications 3.3.3.8 ACTION 42(b) and 6.9.2.

This report discusses a radiation monitor being inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. This supplement is being provided to reformat the information provided and to clarify the circumstances which contributed to the monitor being out of service. 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 D. A. Johnson, Compliance Supervisor, at (602) 393-3703.

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

J. B. Martin D. H. Coe fgg$

Pl l'

PALO VERDE NUCLEAR GENERATING STATION UNIT 2 Radiation Monitoring Unit Inoperable Greater Than 72 Hours License No. NPF-51 Docket No. 50-529 Special Report 2-SR-90-004-01 Initial Conditions:

This Special Report is being submitted pursuant to Technical Specification (TS) 3.3.3.8 ACTION 42(b) and TS 6.9.2,to report an event in which the Fuel Building Ventilation System High Range Radioactive Gaseous Effluent Monitor (RU-146) 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 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 0910 MST on June 16, 1990. On June 16, 1990, Palo Verde Unit 2 was in Mode 5 (COLD SHUTDOWN).

Back round Information:

Radiation Monitors RU-145 (Fuel Building Ventilation System Low Range Radioactive Effluent Monitor) and RU-146 monitor the Fuel Building, Ventilation Exhaust for release of radioactivity due to a fuel handling accident.

Radiation Monitors RU-145'nd RU-146 work as a pair with RU-145 being the low range monitor for normal radioactive gaseous effluents and RU-146 being the high range monitor for post-accident radioactive gaseous effluents. Normal configuration consists of RU-145.operating and RU-146 in standby. When RU-145 reaches a predetermined setpoint, RU-146 starts and RU-145 goes to standby.

RU-145 initiates a Fuel Building Essential Ventilation Actuation Signal (FBEVAS) when the activity exceeds a predetermined setpoint, RU-146 starts and RU-145 goes to standby. RU-145 initiates a Fuel Building Essential Ventilation Actuation Signal (FBEVAS) when the activity exceeds a predetermined limit. Since RU-145 and RU-146 work in tandem, RU-146 must be declared inoperable if RU-145 is out of service.

Actions Taken:

On June 13, 1990, at approximately 0910 MST, Radiation Monitors RU-145 and RU-146 were removed from service in accordance with an approved work document for scheduled 18-month calibration and surveillance tests (ST). The radiation monitors were also taken out of service to replace a detector and install the temporary modification discussed in Special Report 2-SR-88-009-03. The results of previous surveillance testing indicated that the detector was operating properly, but needed to be replaced as it was approaching its end of useful life. Alternate sampling was initiated in'ccordance with the Preplanned Alternate Sampli'ng Program to monitor the Fuel Building Ventilation System fulfillingTS 3.3.3.8 ACTIONS 36, 37, 40 and 42, as applicable.

Based on Palo Verde experience, the average performance interval for the high and low range effluent monitor 18-month ST is approximately 120 hours0.00139 days <br />0.0333 hours <br />1.984127e-4 weeks <br />4.566e-5 months <br />.

Additionally, during the maintenance, calibration, and surveillance

L I

NRC Document Control Desk Special Report 2-SR-90-004-01 Page 2 activities, there were problems with both the test equipment and the availability of calibration sources. The monitor was'lso not worked continuously due to higher priority work. The monthly surveillance tests were also performed prior to returning the radiation monitor to service.

Corrective maintenance and the 18-month STs were completed and the monitors were returned to service at approximately 1510 MST on June 26, 1990.

Cau o t e E o rgb t RU-146 was inoperable in order to perform scheduled 18-month surveillance testing, replace a detector, install a temporary modification, and perform corrective maintenance, as described above.

Plans and Schedule for Restorin the S stem to Service:

Radiation monitors RU-145 and RU-146 were returned to an OPERABLE status following satisfactory completion of the STs at approximately 1510 MST on June 26, 1990. The monitors were out of service approximately 13 days.