ML17333A183

Special Rept 2-SR-89-002:on 890216,steam Generator 1 Economizer Valve Positioner Failed,Causing Feedwater Sys Oscillation & Reactor Trip & Auxiliary Feedwater Sys 1 Actuation.No Releases of Radioactivity Occurred

ML17333A183
Person / Time
Site:	Palo Verde
Issue date:	02/21/1989
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-00453-JGH-T, 192-453-JGH-T, 2-SR-89-002, 2-SR-89-2, NUDOCS 8903010259
Download: ML17333A183 (6)

Text

AC CEIL RATED DI STRIBUTI ON DEMONSTRATION SYSTEM REGULAY INFORMATION DIS RIBUTI(ASYSTEN (RIDE)

ACCESSION NBR:8903010259 DOC.DATE: 89/02/21 NOTARIZED: NO DOCKET N FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 AUTH. NAME AUTHOR AFFILIATION HAYNES,J.G. Arizona Nuclear Power Project (formerly Arizona Public Serv RECIP.NAME 'ECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 2-SR-89-002:on 890216,steam generator 1 economizer valve positioner failure caused oscillation.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR TITLE: 50.73 Licensee Event Report (LER), Incident Rpt,

/ ENCL / SIZE:

etc.

NOTES:Standardized plant. 05000529 RECIPIENT COPIES RECIPIENT COP1ES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PDS LA 1 1 PD5 PD 1 1 CHAN,T 1 1 DAVIS,M 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2, ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 ARM/DCTS/DAB 1 DEDRO 1 1 NRR/DEST/ADE 8H 1 1 NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 NRR/DEST/ESB 8D ]

NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSB 8D 1 1 NRR/DEST/RSB 8E 1 1 NRR/DEST/SGB 8D 1 1 NRR/DLPQ/HFB 10 NRR/DOEA/EAB NRR/DREP/RPB 10 ll 1 1

2 1

1 2

NRR/DLPQ/QAB NRR/DREP/RAB 10 10 SIB 9A 1

1 1

1 1

1 NUDOCS-ABSTRACT 1 1 RE FIJ 02 1 1 RES/DSIR/EIB 1 1 S DSR/PRAB 1 RGN5 FILE 01 1 1 EXTERNAL: EG&G WILLIAMSFS 4 4 FORD BLDG HOY,A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRIS,J 1 1 NSIC MAYS,G 1 1 NOTES: 1 1 NOTE LO ALL "RIDS" RECIPIENIS:

PZEASE HELP US IO REDUCE HASTE CXHZACZ IHE DOCX2 KVI CONSOL DESKF RQCN Pl-37 (EXT. 20079) KO EIZKQCQR YOUR NME PKM DIPHGBUZIQN LI81$ FOR DOCl26RIS YOU DCH'T NEEDf TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46

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Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX. ARIZONA 85072-2034 192-00453-JGH/TDS/JEM February 21, 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 (License No. NPF-51)

Special Report 2-SR-89-002 File: 89-020-404 Attached please find Special Report 2-SR-89-002 prepared and submitted pursuant to Emergency Plan Implementing Procedure -03. This report discusses a NOTIFICATION OF UNUSUAL EVENT due to a Safety Injection System Actuation.

If you have any questions, please contact T. D. Shriver, Compliance Manager at (602) 393-2521.

Very tru y yours, yp J; G. Haynes Vice President Nuclear Production JGH/TDS/JEH/kj Attachment cc: D. B. Karner (all w/a)

J. B. Hartin T. J. Polich E. A. Licitra A. C. Gehr INPO Records Center R. T. Hilstead C. F. Tedford F. L. Russo R. Godbehere R. Colson 8~OSO~o WO2 i ~p Wg Oob5V~

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t 1 Palo Verde Nuclear Generating Station Unit 2 Notification of Unusual Event Docket No. 50-529 License No. NPF-51 Special Report No. 2-SR-89-002 This Special Report is being provided pursuant to Emergency Plan Implementing Procedure (EPIP)-03 (Notification of Unusual Event Implementing Actions) to report the declaration of a Notification of Unusual Event (NUE) for Palo Verde Unit 2. The NUE was declared pursuant to EPIP-02 (Emergency Classification) as a result of the initiation of a Safety Injection Actuation Signal (SIAS) on low pressurizer pressure.

On February 16, 1989 Palo Verde Unit 2 was operating at 100 percent power in Mode 1 (POWER OPERATION) when a failure of the Steam Generator number 1 economizer valve positioner .caused a feedwater system oscillation. The economizer valve indicated closed in the Control Room. The secondary side control room operator attempted to terminate the transient by placing Steam Generator Number 1 economizer valve in manual and opening the valve to approximately 17 percent. At approximately 0345 MST, immediately following the economizer valve positioning, the reactor tripped on low level in Steam Generator Number 1, and a subsequent Auxiliary Feedwater Actuation System-1 (AFAS) actuation occurred. Following the reactor trip, the economizer valve remained open in manual causing excessive feedwater flow to Steam Cenerator Number 1, overcooling of the Reactor Coolant System (RCS), and a decrease in RCS pressure, which resulted in a concurrent Safety Injection Actuation Signal (SIAS) and Containment Isolation Actuation Signal (CIAS) approximately 30 seconds later. Following the SIAS/CIAS, Steam Generator Number 1 level increased to the high steam generator level setpoint, and at approximately 0347 MST, a Main Steam Isolation Signal (MSIS) actuation resulted. Following the MSIS, feedwater flow through the economizer valve was automatically isolated. The class 1E auxiliary feedwater system continued to provide feedwater to the steam generators as necessary.

At approximately 0352 MST on February 16, 1989 a Notification of Unusual Event (NUE) was declared. At approximately 0400 MST on February 16, 1989 the appropriate state and local agencies were notified via the Notification and Alert Network (NAN). The Nuclear Regulatory Commission (NRC) Operations Center was notified at approximately 0444 MST on February 16, 1989.

Stable conditions were achieved and the NUE was terminated at 0449 MST on February 16, 1989, The event did not result in any challenges to fission product barriers or result in any releases of radioactive materials. A Licensee Event Report will be submitted within 30 days of the event in accordance with 10CFR50 73.

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