ML17333A183
| 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
ACCEILRATED DISTRIBUTION 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
/
ENCL /
SIZE:
TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.
NOTES:Standardized plant.
05000529 RECIPIENT ID CODE/NAME PDS LA CHAN,T INTERNAL: ACRS MICHELSON ACRS WYLIE AEOD/DSP/TPAB ARM/DCTS/DAB NRR/DEST/ADE 8H NRR/DEST/CEB 8H NRR/DEST/ICSB 7
NRR/DEST/MTB 9H NRR/DEST/RSB 8E NRR/DLPQ/HFB 10 NRR/DOEA/EAB ll NRR/DREP/RPB 10 NUDOCS-ABSTRACT RES/DSIR/EIB RGN5 FILE 01 EXTERNAL: EG&G WILLIAMSFS H ST LOBBY WARD NRC PDR NSIC MAYS,G NOTES:
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RECIPIENT ID CODE/NAME PD5 PD DAVIS,M ACRS MOELLER AEOD/DOA AEOD/ROAB/DSP DEDRO NRR/DEST/ADS 7E NRR/DEST/ESB 8D NRR/DEST/MEB 9H NRR/DEST/PSB 8D NRR/DEST/SGB 8D NRR/DLPQ/QAB 10 NRR/DREP/RAB 10 SIB 9A RE FIJ 02 S DSR/PRAB FORD BLDG HOY,A LPDR NSIC HARRIS,J COP1ES LTTR ENCL 1
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1 NOTE LO ALL "RIDS" RECIPIENIS:
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Arizona Nuclear Power Project P.O. BOX 52034
~
PHOENIX. ARIZONA85072-2034 192-00453-JGH/TDS/JEM February 21, 1989 U. S. Nuclear Regulatory Commission NRC Document Control Desk Washington, D.C.
20555
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Unit 2 Docket No.
STN 50-529 (License No.
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 (all w/a) cc:
D.
B. Karner 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 WO2 i 8~OSO~o Oob5V~
pDR gDOCK O>oopNU S
~p Wg
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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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