ML20005D663

LER 89-027-00:on 891106,Train a Svc Water Pump Seal Water Supply Automatically Transferred to Backup Supply Due to Low Pressure.Caused by Seal Water Normal Supply Inadvertently Isolating While de-energizing.Manual revised.W/891206 Ltr

ML20005D663
Person / Time
Site:	Beaver Valley
Issue date:	12/06/1989
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-89-027, LER-89-27, ND3MNO:1996, NUDOCS 8912140057
Download: ML20005D663 (5)

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Telephrte (412) 393-6000 Nuclear Group .  ?

P O Box 4 Shippingport. PA 15077 0004 December 6, 1989 ND3MNO:1996 g

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Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 LER 89-027-00 __

. United States Nuclear Regulatory Commission Document Control Desk

' Washington, DC 20555 l i

l Gentlemen: q In acccrdance with Appendix A, Beaver Valley Technical l Specifications, the following Licensee Event Report is submitted:  ;

LER 89-027-00, 10 CFR 50.73.a.2.jv, "ESF Actuation - l" Automatic Transfer of Seal Water Supply".

T. P. N onan .

General Manager l' Nuclear Operations cj  ;

Attachment l

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l 8912140057 891206 PDR ADOCK 05000412 S PDC

T Qoc mbnr 6, 1989

• .* ND3MNO:1995 Page.two

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Eh th cc: Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Commission f Region 1 475 Allendale Road King of Prussia, PA 19406 i C. A. Roteck, Ohio Edison l Mr. Peter Tam,_ BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, DC 20555 J. Beall, Nuclear Regulatory Commission,

, BVPS Senior Resident Inspector f; i

Dave Amerine. i Centerior Energy i 6200 Oak Tree Blvd.

Independence, Ohio 44101 I 1

INPO Records Center i Suite 1500 l 1100 Circle 75 Parkway ,

Atlanta, GA 30339 .

4 G. E. Muckle, Factory Mutual Engineering, Pittsburgh Mr. J. N. Steinmetz, Operating Plant Projects Manager  !

l Mid Atlantic Area l Westinghouse Electric Corporation Energy Systems Service Division Box 355 Pittsburgh, PA 15230 I

American Nuclear Insurers c/o Dottie Sherman, ANI Library The Exchange Suite 245 1

270 Farmington Avenue Farmington, CT 06032

, Mr. Richard Janati Department of Environmental Resources P. O. Box 2063 16th Floor, Fulton Building Harrisburg, PA 17120 Director, Safety Evaluation & Control l Virginia Electric & Power Co.

P.O. Box 26666 One James River Plaza Richmond, VA 23261

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NR'C Form 384 U S. NUCLE.T.A LElULATORY COMMISSION i LF7 COVED OMS NO 3160 4104 LICENSEE EVENT REPORT (LER) '"Na'8 8 '***

F ACILITV NAME 11) DOCKET NUMSER (2) P AGE (3, Beaver Valley Power Station, Unit 2 -

0 15101010141112 1 lOFl 013 TITLE 14:

i ESF Actuation - Automatic Transfer of Seal Water Supply EVENT DATE 19 LER NUMBE R (6) REPORT DATE 17) OTHE R F ActLITIES INVOLVED 18)

AL M'JNTH DAY YEAR YEAR II

[g MONTH DAY YEAR P ACILIT V NAMES DOCKET NUMBER 131 f N/A 0l5j0l0[0] ; l l 1l1 0l6 89' 8l9 ,

0l2l7 0l 0 1l2 0l 6 8l9 0 1 5l0 togot i i DPE R ATING  ?'HIS REPORT IS SU5MITTED PURSUANT TO THE R60UtREMFNTS OF 10 CFR 6 (Check one or more e' the fotteema! till N'N 1 20.402th) 20 406 del 60.73deH2Hwl 73.71(t)

R 20 406deH1Hil 60 38teH11 60.73teH2 Het 73.711e1 (101 11010 to dawumi So.**wu2) 60.73aH2n*

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LICENSEE CONTACT FOR THl3 LER 112)

TE LEPHOfwE NUMBER  !

ARE A CODE T. P. Noonan, General Manager of Nuclear Operations 411 12 61413 l -l 1121518 COMeLETE ONE LINE FOR EACH COMPONENT F AILURE DESCR18ED IN THis REPORT (131 j CAUSE $YSTE M COMPONENT "$[ "y#0RTA*

o ppd $ CAUSE S YST E M COMPON E NT M A R

REPORT 4 E O pp l

D E]C XIXlX IX X] XIX IX N I I I 'l I I i l i I I I I I I I I I I I I SUPPLEMENTAL REPORT E XPECTED (141 l MONTH DAY YEAR 1

$U6 MISSION YES 199 res, templete EXPECTEO 309A*IS$10N DA Til NO

{ l l A38TR ACT (Limst 10 f dCD speces. d e . acarossmewy Mesea arap>e spece rF#eWratlWM hpes/ lIOI

j. On 11/6/89, the Unit 2 Train A Service Water Pump seal water -i f

supply automatically transferred to its backup supply due to low I seal water pressure. Pump operation was unaffected. The low pressure occurred when the seal water normal supply (Filtered Water) was inadvertently isolated while de-energizing a Unit 1

Motor Control Center (MCC) and its associated AC Distribution l . Panel for maintenance. Prior to de-energizing the MCC, the Unit 1 Operating Manual Electrical Load lists was used to identify the components tisat would be affected by this evolution. The Unit l'120 Volt AC operating manual failed to list all the valves that were powered from the involved AC Distribution

l. Panel. Due to this discrepancy, the Filtered Water system .

supply valves were inadvertently de-energized, isolating the Filtered Water system. Operators realigned the Filtered Water -

at:pply and restored the Unit 2 Seal Water to its normal arrangement. The Unit 1 120 Volt AC operating manual power i supply list has been revised to include the involved valves.

There were no safety implications due to this event. The Service Water Pump seal water supplies are described in Unit 2 UFSAR section 9.2.1.1.2.

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l NRC Form 3BSA U.S NUCLE A3t 7,EGULATORY COMMISSION UCENSEE EVENT REPORT (LER) TEXT CONTINUATION Arenovio ove No. aiso-om

,, IXPIRES: 8 '31/88 F ACILITY NAME (1) DOCKL1 NUMBER (2) ER NUMS$9 (Si PW @

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Beaver Valley Power Station, Unit 2 o [5 lo lo lo l 411l2 81 9 Ol2 l7 -

01 0 Ol2 OF 0 l3 i TEXT & more spece 4 mems( use eMaonet NAC Fann Js5NsJ (17)

Descriotion of Event At 2020 Hours on November 6, 1989, the Service Water Pump Seal Water low pressure alarm was received in the Unit 2 Control Room.

Operators verified that the service water pump seal water supply had automatically transferred from its normal supply (Filtered Water) to its backup supply (discharge of the service water pump). Service Water Pump operation was unaffected by this transfer.

Investigation determined that the low seal water pressure was a ,

result of the Filtered Water system being inadvertently isolated when the non-safety related 480 Volt Motor Control Center (MCC) 1-1 was de-energized for maintenance. Before de-energizing the MCC, the Unit 1 480 Volt System Operating Manual was used to identify all components that would be affected by this evolution.

This manual showed that MCC 1-1 supplied power to AC Distribution Panel PNL-AC-1. The Unit 1 120 Volt AC System Operating Manual was then used to identify all components energized from PNL-AC-1.

This manual listed Clarifier to Filtered Water supply valve TV-WT-102 as being supplied from PNL-AC-1. Based on this, it was verified that a supply path to Filtered Water would still exist via the Filtered Water Storage Tank to Filtered Water supply valve LCV-WT-102. However, the Operating Manual did not identify that LCV-WT-102 was also powered from PNL-AC-1. This resulted in both TV-WT-102 and LCV-WT-102 being de-energized when MCC 1-1 was removed from service. This isolated both supply paths to the Filtered Water system, causing the system to de-pressurize.

Cause of Event This event was a result of a deficiency in the Unit 1 120 Volt AC System Operating Manual. The manual failed to list all loads supplied by PNL-AC-1. A review of the electrical wiring drawings verified that LCV-WT-102 was powered from PNL-AC-1, although the operating manual did not list it as one of the panel's loads.

The deficiency was the result of basing the load list on the system one-line drawings that did not show multiple loads off a single breaker. When multiple loads were powered from a single breaker, only one load was shown on the drawing.

su,5. GP5 i 1148,s 0 W1 UCC N NRC FORM 366A

unc e.,. seen u.s nuetsax .stutatoRv commission

'"* ' 7 OCENSEE EVENT REP 3RT (LER) TEXT CONTINUATION mRovio ove wo siso-ois

,. - . . EXP1RES: $131/N F ACILITY Naut {1l DOCKtT NUMBER til LER NUMSER to) Pa0E (3) v5^" -

"$2. -

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B3 aver Valley Power' Station, Unit 2 '

o l5 l0 l0 l0 l 411 l2 819 012 l 7 -

Ol0 0l3 OF Ol3 TEXT (# snore apsco de regumect, use edwoons/ NRC Fonn JeEA'st (17) i Previous Similar Event _s There have been no previous similar events.

corrective Actions operators verified that the Service Water Pump was operating properly.and was unaffected by the seal water transfer. Operators opened manual valve WT-97, which bypassed LCV-WT-102 and repressurized the Filtered Water system. The Pnit 2 Service Water Pump seal supply system was restored to its pre-event configuration.

The Unit'l 120 Volt AC System Operating Manual has been revised.

All 120 Volt AC power supply lists were reviewed and updated to include all comp-onents energized from 120 Volt AC power. .

1 This incident will beLincluded in training for the Procedures ,

Group.- This training will include one-line drawings conventions  !

and the potential _for' multiple loads on a single breaker. $

l Safety-Analysis j ;

There were no safety implications due to this event.- The Service )j Water Pump seal. water system is designed to transfer from Filtered '

Water.to Service Water pump discharge on low seal water pressure.

The seal water system function is described in Unit 2 UFSAR Section 9.2.1.1.2. The Service Water Pump operation was  !

unaffected by this event.

5 NAC FORM 3fieA ev.s. GPO: 1936- W-144 0N TO (9 83) .

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