ML17305A382

LER 89-015-00:on 890901,phase B Shunt Reactor on Devers Transmission Line Failed,Causing Ground Fault on 500 Kv Line & Release of Large Vol of Oil & Fire.Caused by Failure of Winding to Bushing.Fire extinguished.W/891102 Ltr

ML17305A382
Person / Time
Site:	Palo Verde
Issue date:	11/02/1989
From:	James M. Levine, Shriver T ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
102-00547-JML-T, 102-547-JML-T, LER-89-015, LER-89-15, NUDOCS 8911140309
Download: ML17305A382 (14)

Text

ACCELERATED D ~'YRIBUTION DEMONS ATION SYSTEM Cj, REGULATORY INFORMATION DISTRIBUTION SYSTEM (RXDS)

ACCESSION NBR:8911140309 DOC.DATE: 89/11/02 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 AUTH. NAME AUTHOR AFFILIATION SHRIVER,T.D. Arizona Public Service Co. (formerly Arizona Nuclear Power LEVINE,J.M. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER 89-015-00:on 890901,switchyard fire. ltr.

W/8 D

DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR TITLE: 50.73/50.9 Licensee Event Report (LER),

2Incident ENCL( SIZE:

Rpt, etc.

I6 NOTES: 05000528 /

RECIPIENT COPXES RECIPIENT COPIES .

ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL D.

PD5 LA 1 1 PD5 PD 1 1 CHAN,T 1 1 DAVIS,M. 1 1 D

INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DS P/TPAB 1 1 AEOD/ROAB/DSP 2 2 DEDRO 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRRf 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 1 1 NRR/DLPQ/PEB 10 1 1 NRR/DOEA/EAB 11 1 1 NRR/DREP RPB 10 2 2 NUDOCS-ABSTRACT 1 1 CE 1 1 RES/DSIR/EIB 1 1 RGN5 FILE 01 1 1 EXTERNAL EG&G WILLIAMSi S 4 4 L ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC MAYS,G 1 1 NSIC MURPHYiG A 1 1 R NUDOCS FULL TXT 1 1 NOTES 1 1 D

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NOTE TO ALL "RIDS" RECIPIENTS: I S

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

FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 40 ENCL 40

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Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P 0 BOX 52034 ~ PHOENIX. ARIZONA 85072-2034 102-00547-JML/TOS/RKR November 2, 1989 U. S. Nuclear Regulatory Commission NRC Document Control Desk Washington, D.C.'0555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528 (License No. NPF-41)

Licensee Event Report 89-015-00 File: 89-020-404 Attached please find voluntary Licensee Event Report (LER) No. 89-015-00.

This voluntary report was prepared pursuant to guidance contained within 10CFR 50.73. In accordance with 10CFR 50.73(d), we are herewith forwarding a copy of the LER to the Regional Administrator of the Region V office.

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

Very truly yours, H. evine ice President Nuclear Production JGH/TDS/RKR/kj Attachment cc: W. F. Conway (all w/a)

E. E. Van Brunt, Jr.

J. B. Hartin T. J. Polich H. J. Davis A. C. Gehr INPO Records Center 85!iii40309 89ii02 PDR"";ADOCK 05000528 S PDC

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U.S. NUCLEAR REGULATORY COMMISSION APPROVEO OMB NO. 3150d104 EXPIRES: 4/30/92 ESTIMATED BURDEN PER RESPONSE TO COMPLY WTH THIS INFORMATION COLLECTION REOVESTt 50.0 HRS. FORWARD LICENSEE EVENT REPORT {LER) COMMENTS REGARDING BURDEN ESTIMATE TO THE AECORDS AND REPORTS MANAGEMENT BRANCH (PS30), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, OC 10555, AND TO THE PAPERWORK REDUCTION PROJECT (3)500104), OFFICE OF MANAGEMENTANO BUDGET, WASHINGTON, OC 20503.

FACIUTY NAME l1l DOCKET NUMBER l1) PAGE Palo Verde Unit 1 0 s o 0 o 52 8 1oF05 TITLE l4)

Switchyard Fire EVENT DATE (5) LER NUMBER (5) REPORT DATE (7) OTHER FACILITIES INVOLVED (5)

SEOVENTIAL OAY FACILITYNAMES DOCKET NUMBER(S)

MONTH DAY YEAR YEAR g+l NUMBER .jw NVMSEA MONTH YEAR Palo Verde Unit 2 0 5 0 0 0 5 2 9 0 9 01 89 8 9 0 1 5 00 11 0 2 8 9 Palo Verde Unit 3 0 so 0 0 53 0 THIS REPORT IS SUBMITTED PURSUANT T0 THE REQUIREMENTS OF 10 CFR g: /Cheep onr ot mote of the lollowlnp/ (11 OPE RATING MODE (5) 20.402(b) 20.405(cl 50.73(el(1) (iv) 73.71(III

~ OWER 20405(sill)(0 50.35(c) (1) 50.73(el(2) (vl 73.71(cl LEVEL (10) 20.405( ~ l(1) (Sl 50.35(cl(2) 50.73(el(2)(vill OTHER ISprcily In 40ttrect Oelow encl In Fret, IY/IC Form

~ 20.405( ~ ) (1)(iiil 50.73(s) (1)(B 50,73(el(2) (riii)(A) 3554/

20.405 (e I (1)(Iv) 50.73(el(1) (QI 50.7 3(c) l2) (villi (B) 20.405(c) (I ) (rl 50.734) l2) (Iii) 50.73(s)(1)lc) Voluntary LICENSEE CONTACT FOR THIS LER (12I TELEPHONE NUMBER AREA CODE Timothy D. Shriver, Compliance Manager 60 23 93 25 21 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE OESCRIBEO IN THIS REPORT (13)

"N"""Yr CAUSE SYSTEM COMPONENT MANUFAC TURER EPORTABLE TO NPADS

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c,rycp'ANUFAC CAUSE SYSTEM COMPONENT TVAER EPOATABLE TO NPADS X F K CA P GO 80 N  %%!EIe h Alba l A',AC SUPPLEMENTAL REPORT EXPECTED l14) MONTH OAY YEAR EXPECTED SUBMISSION DATE IISI YES /II yet, complete EXPECTED SUEAIISSIOII DATE/ NO ABSTRACT /l,lmlt to Irt)0 tpecet, I,r., epptoclmetrly ///teen tlnple specs typewti ttrn linn/ (15)

At approximately 1618 MST on September 1, 1989, Palo Verde Unit 1 was in a refueling outage with the core off-loaded, Palo Verde Unit 2 was in Mode 1 (POWER OPERATION) at 100 percent power and Palo Verde Unit 3 was in Mode 5 (COLD SHUTDOWN) when the RBR phase shunt reactor on the Devers transmi'ssion line at the PVNGS switchyard failed catastrophically. The failure imposed a ground fault on the Devers 500 kv line. Breakers isolating the Devers line from the PVNGS switchyard and Devers substation tripped as designed to isolate the fault and deenergize the Devers line. The failure also resulted in the release of a large volume of oil and fire. All other portions of the switchyard remained in service during and following the event.

The cause of the shunt reactor failure was a lead failure.

To prevent recurrence, Salt River Project (operating manager for the switchyard) will approve and review the results of switchyard component testing prior to acceptance of equipment for installation in the switchyard.

There have been no previous similar events reported pursuant to 10CFR50.73.

NRC Fotm 355 (509)

t NRC FORM35SA ILS. NUCLEAR REGULATORY COMMISSION APPROVED OMB NO.31504)(04 (509) EXPIRES: 4/30)92 ESTIMATED BURDEN PER RESPONSE TO COMPLY WTH THIS LICENSEE EVENT REPORT ILER) INFORMATION COLLECTION REQUEST( 50J) HRS. FORWARD COMMENTS REGARDINQ BURDEN ESTIMATE TO THE RECORDS TEXT CONTINUATION AND REPORTS MANAGEMENT BRANCH (P430). U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555, AND TO THE PAPERWORK REDUCTION PROJECT (31504)104), OFFICE OF MANAGEMENTAND BUDGET,WASHINGTON, OC 20503.

FACILITY NAME (I) DOCKET NUMBER (2) LER NUMBER (5) PAGE (3)

YEAR g

, U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, OC 20555, AND TO THE PAPERWORK REDUCTION PROJECT (3)604)05). OFFICE OF MANAGEMENTAND BUDGET,WASHINGTON, OC 20503. FACILITY NAME (I) DOCKET NUMBER (2) LER NUMSER LS) PAGE (3) v,'8GUSNTIAL .>MS REVISION g<m NUMSER NUM85R Palo Verde Unit 1 oooo o 52 889 01 5 00 04 OF 0 5 TEXT /// moro 5/hooo /5 ro//I/rod. u>> odCh)/orho/h'RC Form 35849/ (17) H. Method of discovery of each component or system failure or procedural error: The isolation of the Devers transmission line was discovered by Unit 1 Control Room personnel (utility, licensed) as a result of main control board annunciators (HCBD)(ANN). Unit 1 and startup oscillograph alarms (OSG)(ALH) occurred and breakers 992 and 995 indicated open. A cloud of black smoke originating from the area of the switchyard was observed by station personnel (utility, non-licensed) who reported the fire to Fire Protection and the Unit 1 Control Room in accordance with APS policies. I. Cause of Event: The cause of the failure of the phase RBR shunt reactor described in Section I.B and I.D is believed to be moisture or flaws in the vertical pressboard support or flaws in the insulating tape on the lead. Routine tests of the repaired shunt reactor were performed. These tests which placed meaningful stress on the high voltage insulation were limited to a reduced level impulse test, An enhanced voltage partial discharge test was not performed. This higher voltage test may have identified any insulation problems. J. Safety System Response: No safety system responses occurred and none were required during this event. K. Failed Component Information: The failed shunt reactor was manufactured by General Electric. It is a 525000 gnd Y/303109, 50000 kva shunt reactor. II. ASSESSMENT OF THE SAFETY CONSEQUENCES AND IHPLICATIONS OF THIS EVENT: The Devers line was isolated from the switchyard as designed. The fault did not affect operation of the switchyard. All other shunt reactors installed at the Palo Verde switchyard had previously undergone impulse and enhanced voltage partial discharge tests. This shunt reactor is not safety related and is a component of the Devers transmission line. Therefore, there was no threat to the health and safety of the public. III. CORRECTIVE ACTIONS: A. Immediate: PVNGS Fire Department immediately responded to the fire and NRC Form 366A (689) NRC FOIQI SSSA U.S. NUCLEAR REOULATORY COMMISSION APPROVED OMB NO. 3)50410E I 5 $ 9) EXPIRES: S/30/92 ESTIMATED BURDEN PER RESPONSE TO COMPLY WTH THIS LICENSEE EVENT REPORT (LER) INFORMATION COLLECTION REQUEST: 508) HRS. FORWARD COMMENTS REOARDINO BURDEN ESTIMATE TO THE RECORDS TEXT CONTINUATION AND REPORTS MANAOEMENT BRANCH IPJ)30), U.S. NUCLEAR REGULATORY COMMISSION. WASHINOTON. DC 20555. AND TO THE PAPERWORK REDUCTION PROJECT (3150S)104). OFFICE OF MANAOEMENTAND BUDOET, WASHINGTON, DC 20503. FACILITY NAME I)I DOCKET NUMBER I2) LER NUMBER IS) PACE ISI VSAR /~II SEOUENTIAL NUM ER ~mr'l 'N4 REVISION NUM ~ 4 Palo Verde Unit 1 o s o o o 5 2 8 89 01 5 00 05 OF 0 5 TEXT //I more sects /s etII/red. use edd/dorss/NRC Form 3u)A's/ I IT) extinguished the fire at approximately 1726 HST on September 1, 1989. B. Action to Prevent Recurrence: Salt River Project (operating manager for the switchyard) will approve and review the results of switchyard component testing prior to acceptance of equipment for installation in the switchyard. IV. PREVIOUS SIHILAR EVENTS: There have been no previous similar events reported pursuant to 10CFR50.73. NRC Fono 355A NSB) V II II l 1 h l 1 1 'll I