ML17306A220

Special Rept 2-SR-90-005-01:on 900716,plant Vent Sys High Range Effluent Monitor Inoperable for More than 72 H.Caused by Requirement to Perform Scheduled 18-month Surveillance Testing.Monitor Returned to Svc on 900729

ML17306A220
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
192-00748-JML-T, 192-748-JML-T, 2-SR-90-005-01, 2-SR-90-5-1, NUDOCS 9110240091
Download: ML17306A220 (8)

Text

ACCELERATED DEMONS'+ATION SYSTEM, DISTRIBUTION REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9110240091 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)

SUBJECT:

Special Rept 2-SR-90-005-01:on 900716,plant vent sys high range effluent monitor inoperable for more than 72 h.Caused by requirement to perform scheduled 18-month surveillance testing. Monitor returned to svc on 900729.

3 IncidentQRpt, etc.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR I ENCL SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER),

NOTES:Standardized plant. 05000529 j

RECIPIENT COPIES RECIPIENT COPIES ID ID PD5 LA CODE/NAME TRAMMELL,C LTTR ENCL 1

1 1

1 PD5 PD CODE/NAME THOMPSON,M 1,1 LTTR ENCL 1 1 INTERNAL: ACNW 2 ACRS 2 2 AEOD/DOA 1 1 AEOD/DSP/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 1 i

1 RR ~H B8D1 1 1 NRR/DST/SRXB 8E 1 1 02 1 1 RES/DSIR/EIB 1 1 RGN5 FILE 01 1 1 EXTERNAL: EG&G BRYCE,J.H 3 3 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSIC MURPHY,G.A 1 1 NSIC POORE,W. 1 1 NUDOCS FULL TXT 1 1 NOTES' 1 1

~to C NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE O'ASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOiil Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAii!E FROivI DISTRIBUTION LISTS FOR DOCUb!ENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 35 ENCL 35

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Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034 ~ PHOENIX. ARIZONA 85012-2034 JAMES M. LEVINE 192-00748-JUL/TRB/KR VICE PRESIDENT NUCLEAR PRDDUCTIDN October 10, 1991 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-90-005-01 File'1-020-404 Attached please find Supplement 1 to Special Report 2-SR-90-.005 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/KR/nk Attachment cc: W. F. Conway (all with attachment)

J. B. Martin D. H. Coe 91 102400) ~1]010

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PALO VERDE NUCLEAR GENERATING STATION UNIT 2 Radiation Monitor Inoperable Greater Than 72 Hours License No. NPF-51 Docket No. 50-529 Special Report 2-SR-90-005-01 tia Co d ons:

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 Plant Vent System High Range Effluent Monitor (RU-144) was inoperable greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />'he 72-hour period for returning the monitor to service was exceeded at approximately 0840 MST on July 19, 1990. On July 19, 1990, Palo Verde Unit 2 was in Mode 1 (POWER OPERATION) at approximately 15 percent power.

Bac round Information:

Radiation monitors RU-143 (Plant Vent System Low Range Effluent Monitor) and RU-144 work as a pair. RU-143 is n'ormally in service and continuously monitors the plant vent exhaust. RU-144 is automatically started when RU-143 reaches a predetermined setpoint. RU-144 is provided'for tracking radioactive effluents during postulated accident scenarios.

On July 16, 1990, at approximately 0840 MST, the Plant Vent System Low Range Effluent Monitor (RU-143) and High Range Effluent Monitor (RU-144) were taken out of service in order to'erform scheduled surveillance testing (ST) which included the 18-month channel calibration. Alternate sampling was initiated in accordance with the Preplanned Alternate Sampling Program to monitor the Plant Vent 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 />. During the performance of the ST described herein, several delays contributed to exceeding the average test performance interval. Delays were incurred when qualified Instrument and Calibration personnel were required to perform higher priority work elsewhere in the plant. Radioactive sources used for monitor calibration were not available as they were being .used in Unit 3. Measuring and Test Equipment availability problems occurred when instrumentation being used malfunctioned and replacements were not immediately available'uring testing, problems were identified which required troubleshooting, reworking, and replacing parts. Delays occurred while obtaining the necessary spare parts.

Unit 2 personnel performed an evaluation of the amount of time necessary to complete the ST ~ Based upon the results of the evaluation, areas for

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NRC Document Control Desk Special Report 2-SR-90-005-01 Page 2 improvement were identified. The results of this evaluation were presented to responsible management to ensure that appropriate consideration would be given to taking action to minimize effluent monitor out-of-service time.

The 18-month surveillance testing was completed and the monitors were returned to service at approximately 0815 MST on July 29, 1990.

C use of the o erabilit RU-144 was inoperable in order to perform scheduled 18-month surveillance testing, as described above.

la s a d Schedule for Restorin the S stem to Service:

Radiation monitors RU-143 and RU-144 were returned to an OPERABLE status following satisfactory completion of the STs at approximately 0815 MST on July 29, 1990. The monitors were out of service approximately 13 days.

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