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lOctober 31, 1989 lND3MNO 1983 |

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Beaver Valley Power Station, Unit No. 2Docket No. 50-412, License No. NPF-73 |

LER 89-014-01 |

United States Nuclear Regulatory CommissionDocument Control DeskWashington, DC 20555

Gentlemen

.In accordance with Appendix A, Beaver Valley TechnicalSpecifications, the following revised Licensee Event Report issubmitted:

LER 89-014-01, 10 CFR 50.73.a.2.iv. " Leak CollectionVentilation Flowpath Automatic Realignment Actuation".

c%dT. P. loonan,

General ManagerNuclear Operations

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October 31, 1939 '

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Page two,

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i cc Mr. William T. Russell (Regional Administrator ,

United States Nuclear Regulatory Commission |Region 1 ;

475 Allendale Road ,

! Xing of Prussia, PA 19406 j

C. A. Roteck, Ohio Edison

Mr. Peter Tam, BVPS Licensing Projact Manager i

United States Nuclear Regulatory Commission ;Washington, DC 20555J. Beall, Nuclear Regulatory Commission, '

!BVPS Senior Resident Inspector

CAPCO Nuclear Projects Coordinator |

Toledo Edison j,

INPO Recordo Center*

Suite 15001100 circle 75 Parkway i

sAtlanta, GA 30339

G. E. Muckle, Factory Hutual Engineering, Pittsburgh t

Mr. J. N. Steinmetz, Operating Plant Projects ManagerMid Atlantic AreaWestinghouse Electric CorporationEnergy Systems Service DivisionBox 355Pittsburgh, PA 15230

:

American Nuclear Insurers '

c/o Dottie Sherman, ANI Library'

The Exchange Suite 2452','O Farmington AvenueFarmington, CT 06032

Mr. Richard JanatiDepartment of Environmental ResourcesP. O. Box 2063

!16th Floor, Pulton BuildingHarrisburg, PA 17120

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

P.O. Box 26666One James River PlazaRichmond, VA 23261

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On 5/6/89 at 0210 hours, the supply breaker to the J 480 VoltEssential Bus opened. The alternate J Bus Supply Breaker did notclose. This de-energized the J Bus and all components powered offthe J Bus, including Non-Filtered Ventilation Exhaust radiationmonitor (2RMR-RQ301). As designed, the monitor failed high whende-energized. This High Radiation signal initiated an automaticventilation realignment, diverting the ventilation from the

Non-Filtered to Filtered flowpath. Operators found no apparentcause for the breaker to trip. It was discovered that the resetbutton on the supply breaker was in the "out" position. Following

an investigation the reset button was returned to its normal "in"position, and the supply breaker was closed. The J Bus includingradiation monitor (2RMR-RQ301) was re-energized and the

ventilation system was returned to its normal flowpath. Afterreplacing with a tested spare, Maintenance sent the J Bus supplybreaker to the vendor for analysis. The breaker was found to have

; broken circuit run in the power shield which caused the spuriousatrip. All relays and circuits associated with the supply andalternate breakers were tested and verified operable. There worono safety implications due to this event. This event was bounded-

by Beaver Valley UFSAR Section 6.5.3.2, " Supplementary LeakCollection and Release System".

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Descriotion of EventOn 5/6/89 at 0210 hours, the J 480 volt Essential Bus NormalSupply Breaker (BKR 2J2B) opened. The J Bus alternate supplybreaker (cross tie breaker frcm the X 480 Volt Essential Bus) didnot close. This de-energized the J Bus and all its loads,including the Leak Collection Ventilation radiation monitor(2RMR-RQ301). (2RMR-RQ301) monitors the Non-Filtered VentilationExhaust flowpath. When (2RMR-RQ301) was de-energized, itinitiated a High Radiation signal, as designed. This signalautomatically caused the Non-Filtered Ventilation flow to divertto the Filtered Ventilation Flowpath. This was done byautomatically opening the Non-Filtered to Filtered flowpath supplydampers (2HVS* MOD 202A&B), closing the Non-Filtered flowpathexhaust dampers (2HVS* MOD 201A&B) and stopping the Non-Filteredflovpath exhaust fan (2HVS-FN263A). Operators verified allautomatic actions. The ventilation realignment was notimmediately identified as hn ESP Component Actuation. A laterreview determined that the event was an ESF Component Actuationand the NRC was notified on 5/8/89 at 1615 hours.As designed, the alternate supply breaker should close followingan undervoltage trip of the normal supply breaker and stay openfollowing an overcurrent trip. Operators removed all loadssupplied by the J Bus and performed an investigation. Afterfinding no conditions which would have caused the breaker to tripan attempt was made to manually close the J Bus Supply Breaker;however, the breaker would not close. Operators then closed the ,

alternate supply (tie) breaker. After the alternate breaker wasclosed it was noticed that the reset button on the J Bus SupplyBreaker was in the "out" position. This is designed to occur whenan overcurrent condition exists and is a mechanical interlock toprevent the breaker from being closed. Following the return ofthe reset button to its normal "in" position, the operators wereable to close the supply breaker. The alternate breaker was thenreturned to its normal open position. The radiation monitor, the j

480 VAC J Bus, and the ventilation system were returned to theirnormal arrangement.

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Cause of Event

It has been concluded the event occurred due to a spurious trip ofthe J Bus Supply Breaker caused by a broken circuit run in thebreaker's power shield. Following the event Maintenance removedthe J Bus Supply Breaker, replaced it with a tested spare, andsent the breaker to the vendor for analysis. All relaysassociated with the supply and alternate supply breaker werecalibrated and checked and all associated circuits were meggered,tested with an input current, and verified operable. Vendortesting of the breaker determined that the short time trippingfunction would intermittently trip above it's time curve, causingthe breaker to trip erratically. The power shield was then sentto the vendor relay factory for analysis and repair. Innpectionof the power shield revealed a broken circuit, near a resistor,which made intermittent contact. When contact was broken, theshort time tripping function would activate and cause the breakerto trip. It is concluded that the broken circuit in the powershield cauced the spurious trip of the breaker, and that thebroken circuit run was most likely weak or damaged originally.

The alternate supply breaker stayed open ao designed, as there wasno supply undervoltage condition upstream of the J Bus SupplyBreaker. The reset button on the supply breaker opened as aresult of the faulty condition in the breaker. All relay andcircuit tests verified that no overcurrent condition had existedin the bus and that no undervoltage condition existed upstream ofthe J Bus Supply Breaker.

Corrective Action

After the reset button on the J Bus supply Breaker was returned toits normal "in" position, the breaker was closed and the alternatesupply breaker was opened. The radiation monitor was reset andthe ventilation system was realigned to its normal arrangement.An extensive investigation was conducted which included sendingthe supply breaker to the vendor for analysis. The breaker wasfound to have a defective circuit in the power shield which causedit to trip spuriously. All other components were verified to havefunctioned properly. Following the replacement of the supplybreaker with a spare, no system abnormalities have occurred. |

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Previous Similar Events

There have been four previous events when the J Bus wasde-energized, causing radiation monitor (2RMR-RQ301) to fail highresulting in similar ESF actuations. Three of the previousoccurrences were initiated by other unrelated events as follows:

Personnel Error (LER 87-013-00)Improper clearance (LER 88-00,1-00)Electrical overload (LER 88-005-00) i

The last occurrence (LER 89-007-00) was a similar event involvinga spurious trip of the J Bus Supply Breaker.

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Safety Evaluation

There were no safety concerns due to this event. The radiationmonitor initiated a High Radiation signal when de-energized, asdesigned. The Non-Filtered Ventilation Flowpath was diverted tothe Filtered Ventilation Flowpath in response to the High -

Radiation signal. The above actions were conservative and did notadversely affect any safety related systems. This event wacbounded by Beaver Valley Unit 2 UFSAR Section 6.5.3.2.," Supplementary Leak Collection and Release System".

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