ML20006B403

LER 89-018-01:on 891227,reactor Trip Occurred Following Initial Startup from Refueling Outage.Caused by Trip of 480 Volt Ac Feeder Breaker to Rod Drive Motor Generator Sets. Installed Spare Breaker tested.W/900126 Ltr

ML20006B403
Person / Time
Site:	Beaver Valley
Issue date:	01/26/1990
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-89-018-01, LER-89-18-1, ND3MNO:2019, NUDOCS 9002020077
Download: ML20006B403 (5)

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Telephone (412) 393-6000 Nuclear Group P.O Box 4 - .

' Shippingport. PA 15077 6 January 26,.1990- {

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Beaver Valley Power Station, Unit No. 1 Docket No. 50-334,. License No. DPR-66 LER 89-018-00 United: States Nuclear Regulatory Commission-Document Control. Desk  :

Washington, DC 20555 Gentlemen:

In accordance with Appendix A, Beaver Valley Technical- . -

Specifications, the following Licensee Event Report is submitted: -

LER 89-018-00, 10'CFR 50.73.a.2.iv, " Reactor Trip.Due to Loss of Feeder Breaker Supplying Control' Rod Drive Motor-Generator Set".

Very truly yours, T.-P. Noonan-General Manager

. Nuclear Operations 1

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9002020077 DR 900126 '1-0 ADOCK 05000334 PDC

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, .Jenuary'26, 1990_

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. -Pa'ge.two cc -Mr.-William T. Russell Regional Administrator United States-Nuclear Regulatory Commission Region--1 475 Allendale Road I

King of Prussia,_PA. 19406 C. A. Roteck, Ohio Edison Mr. Peter Tam, BVPS' Licensing Project Manager United States Nuclear Regulatory Commission ,

Washington, DC 20555 J. Beall, Nuclear Regulatory Commission, BVPS Senior Resident Inspector Dave Amerine Centerior Energy 6200 Oak Tree Blvd.

j Independence, Ohio 44101 INPO Records Center Suite 1500 1100 Circle 75 Parkway .j Atlanta, GA 30339 ,

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G. E. Muckle, Factory. Mutual Engineering, Pittsburgh Mr. J. N. Steinmetz, Operating Plant Projects Manager Mid Atlantic Area-Westinghouse Electric Corporation-

1 Energy Systems Service Division. i Box 355 Pittsburgh, PA 15230' American Nuclear Insurers c/o Dottie Sherman, ANI Library The Exchange Suite 245  ;

270 Farmington Avenue  ;

Farmington, CT 06032 i

Mr. Richard Janati Department of Environmental Resources P. O. Box 2063 -l l

16th Floor, Fulton Building  !

Harrisburg, PA 17120 1,

Director, Safety Evaluation & Control Virginia Electric & Power Co.

P.O. Box 26666 J 1

One James River Plaza Richmond, VA 23261 J i

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, j APPROVED OMB NO 3150 4104 LICENSEE EVENT REPORT (LER) **a'5''

F ACILITY NAMI Hi DOCKET NUMSER (26 PAGE i3, Beaver Valley Power Station, Unit 1 TITLE 44t 0 l5 l 0 l 0 l 0 l31314 1 lOFl013 Reactor EVENT DATS tli Trip Due to Loss of Feeder Breaker Supplying Control Rod Drive Motor Generator Set LER NUMBER (6) REPORT DATE (71 OTHER F ACILIT118 INVOLVED tel MONT H DAY YEAR YEAR 8(Qjy(*b ,$ MONTH DAY YEAR F ACILITY hauts DOCKET NUMBERt51 N/A 0l5]Ol0l0[ l l )

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1l 2. 2l 7 8 9 8l 9 0l 1 l8 0 l0 0l1 2l6 8 l9 DPE R ATING i N/A THIS REPORT 13 SUBMfTTED PURSUANT 'O THE RLQUIREMENTS OF 10 CFR B: (Chece one or more of the 0 1 50 toioi l t e r nowmpf (til MODE W

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LICENSEE CONTACT FON THIS LER H2)

NAME TkLEPHONE NVV8ER "

Thomas P. Noonan, General Manager Nuclear Operations ' " ' ' * '

4l1 l2 61413 I -11121518 COMPLETE ONE LINE FOR E ACH COMPONENT F AILURE DESCR15EO IN THis REPORT (131 1 CAUSE SYS T E M COMPONENT ## ' A C. REPORTA LE y ,g 7 ER ,

X AIA lBlK lR Gl 0 l 812 Y i I i 1 1 l 1 1 I l l l 1 I l l l I l l 1 l SUPPLEMENT AL REPORT EXPECTED 1141 l MONTH DAY YEAR SUBMisslON 4 ES (19 ves cem,rets 4x9ECTED SU6 MIS $10N OA TEl NO e:T R ACT a ,,,,,, ,, , m .iu,, ,e. ,..,m , ,, n ,, ,,, ,,u, ,, w,,,,,, ,, , o.1 l l l i

On 12/27/89, at 0001 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, the Unit was in Power Operation (Operating Mode 1 from the refueling)outage. at 29% power, The 1A Rod following Drive Motor the initialGenerator startup  !

(RDMG) set was in operation and the 1B RDMG set was out of service awaiting post maintenance testing. Outage maintenance i activities on the 1B RDMG set included bearing replacement and-breaker trip checks. A Caution Tag had been placed on the 1B RDMG required.

set output breaker stating that trip checks were still  :

High Negative At 0121 Rate hours, Flux Trip. a reactor trip occurred on Power Range The operators stabilized the plant in Hot Shutdown Operating Procedures E-9 and ES-0;.1. (Operating Mode 3) utilizing Emergency ,

The cause for the trip was due to a trip of the 480 Volt RDMG sets. Upon a loss of power to the 1A RDMG set, the control AC feeder breaker (1AS)-to the 1A #

rods dropped into the core causing a negative rate reactor trip. Electrical Maintenance was requested to investigate the cause of the feeder breaker trip. There were no safety implications as a result of this event. The Updated Final Safety Analysis Section 14.1.3 Report discusses similar events of this type in

" Rod Cluster Control Assembly Misalignment" .

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. LICENSEE EVENT REPORT (LER) TEXT. CONTINUATION . A*Roveo ove No. mo-o1o4 j EXPIRES: &l31/W .

f ACluTV NAME (1) DOCKET NUMBER G) LER NUMBER (6) Pact (3) nw aw.n i Beaver valley Power Station, nit 1 0 l5 l o l 0 l 0 l 313 l 4 8l 9 -

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DESCRIPTION i On 12/27/89,.at 0001 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, the Unit was in Power Operation-(Operating Mode-1 from.the refueling)outage.- at 29% power,

-The 1A following Rod Drive the Motor initial startup Generator' (RDMG). set was.in operation and the 1B RDMG set was out of service awaiting post maintenance testing. Outage maintenance activities on the 1B RDMG set included bearing replacement and' ,

breaker trip-checks. 'A caution Tag had been placed-on the 1B 4

.RDMG set output breaker stating that trip checks were~still required. At 0121 hours0.0014 days <br />0.0336 hours <br />2.000661e-4 weeks <br />4.60405e-5 months <br />, a reactor trip occurred on Power Range-High Negative Rate Flux Trip. The operators stabilized the plant in Hot Shutdown (Operating = Mode 3) utilizing Emergencyj Operating Procedures E-0 and ES-0.1.-

CAUSE OF THE' EVENT u;

The cause for the trip was due to a trip of the 480-' Volt AC.

feeder breaker (1AS)-to the 1A RDMG sets.- Upon a loss of power to the 1A RDMG set, the' control rods-dropped into the core )

causing a negative rate reactor trip. Electrical Maintenance was requested to investigate the cause of the breaker trip.

Electrical Maintenance-conducted extensive testing on the 1A' .

RDMG feeder breaker (1AS).to determineithe.cause of the breaker- ..;

trip. The breaker trip setpoints were checked utilizing a preventive maintenance procedure and found to be satisfactory.

The power sensor, which provides overcurrent protection.by tripping the breaker on an overcurrent condition, was-suspected to be faulty. This is being sent back.to the vendor for testing and analysis.

CORRECTIVE ACTIONS

1. The operators stabilized the plant in Hot Shutdown (Operating Mode 3) utilizing Emergency Operating Procedures E-0 and'ES-0.1. ,

2. Electrical Maintenance.was requested to investigate and determine the cause for the breaker trip.

3. An installed spare breaker'(3E9) was tested to verify proper power sensor (overcurrent trip check) operation and was found to be satisfactory. This installed spare (3E9) was swapped with the 1A-RDMG' set feeder breaker (1AS) to' allow restart of the 1A RDMG set.

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LICENSEE EVENT REPORT (LER) TEXT CONTINUATION -

U.S. NUCLEMI KEQULATCAV COMMISBION

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EXPIRES: 8/31/98

1. ACILITY NAME 118 - DOCKET NUMBER (2)

LER NUM8ER (6) PAGE (3) '

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Beaver Valley' Power Station, Unit 1 o l5 l 0 l 0 l 0 l 313 l4 8l 9 -

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010 0 l3 OF 0l3 TEXT p mere space 4.rf, use sesoriathMC form JESCsJ (17) 4 '. - The= power sensor for the failed breaker-(1AS) will be= -

.f sent to the vendor for testing and analysis, i

5. The 1B RDMG set was returned to' service.

SAFETY IMPLICATIONS There were no safety implications as a result of this event. ,

The Reactor Protection System. functioned as designed.upon a loss. -I of power:to the Control Rod Drive System. The Updated Final - l Safety Analysis Report discusses similar events of this type in~ 'q Section 14.1.3 " Rod Cluster Control Assembly Misalignment". j.

This section discusses a dropped rod cluster control assembly- E and a dropped rod cluster control assembly bank. It has been- {

shown that the reactor is tripped by the power range negative- '

neutron flux rate trip, consequently for the bank drop event and l the dropped assembly event, there is no core damage.

.y PREVIOUS OCCURRENCES i

There are three previous occurrences at Beaver Valley Unit 1, i '

involving a reactor trip due to-a loss of the Rod Drive Motor Generator sets. These three event were caused by a faulty BST 4 Timer in the MG Controller Cabinet, an actuation of a faulty '

reverse power relay and actuation of a reverse power relay due i to vibration following closure of the breaker _ enclosure door.

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