ML20043B517

LER 90-004-00:on 900423,inadvertent ESF Actuation Occurred During Safeguards Protection Sys Testing.Caused by Personnel Closing Breaker Before Resetting Safety Injection Sys Signal.Signal reset.W/900523 Ltr

ML20043B517
Person / Time
Site:	Beaver Valley
Issue date:	05/23/1990
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-004-01, LER-90-4-1, ND3MNO:2081, NUDOCS 9005300142
Download: ML20043B517 (5)

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Telephone (412) 303-6000 Nuclear Group P O Box 4 <

Shippmgport. PA 15077 0004 May 23, 1990  ;

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Beaver Valley Power Station, Unit No. 2 [

Docket No. 50-412,_ License No. NPF-73 i LER 90-004-00 j United States 1 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 9 0-004-00,- 10 CFR 50.73.a.2.iv " Inadvertent ESF L

Actuation During Safeguards Protection , System Testing". ,

! Very truly yours, l-

! T. P. Noonan-General Manager ,

Nuclear Operations l

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9005300142 900523 ffV PDR ADOCK 05000412 i s PDC

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May 23, 1990

.ND3MNO:2081

,Page two J cc: Mr. T. T. Martin Regional Administrator '

United States Nuclear Regulatory-Commission Region 1 475 Allendale Road King of Prussia, PA. 19406 1 C. A. Roteck, Ohio Edison Mr. Peter Tam, EVPS 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.

Independence, Ohio 44101 1 INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, GA 30339 G.'E. Muckle, Factory Mutual Engineering, Pittsburgh i Mr. J. N. Steinmets, Operating Plant Projects Manager Mid Atlantic Area Westinghouse Electric Corporation Energy Systems Service Division Box 355 Pittsburgh, PA 15230 <

American Nuclear Insurers c/o Dottie Sherman, ANI Library The Exchange Suite 245 270 Farmington Avenue Farmington, CT 06032 l- i l

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

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

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On 4/23/90, while the plant was at 87% Power, Train B Safeguards i Protection System Safety In ection System (SIS) Go Testing was in l

progress. This test veri'ies the actuation of several SIS components in response to a safety injection signal. In order to conduct this test during power operation, the actuation of certain i

affected SIS components are temporarily blocked, per procedure.

During this test, an operator unblocked the operation of charging Containment Isolation Valve (2CHS-MOV310) before the actuation signal was reset. This caused the valve to close, causing the unit to lose charging to the Reactor Coolant System. Operators reset the signal and restored charging. A Human W Fformance r

Evaluation System analysis of this event is bein; eformed.

Further corrective actions may be taken based on the .aults of this analysis. A supplemental report will be issued concerning .

these actions. There were no safety implications due to this l event. This event is bounded by the Analysis of Beaver Valley Unit 2 UFSAR Section 15.5.1, " Inadvertent Operation of Emergency Core Cooling System During Power Operation."

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Descrintion of Event on 4/23/90, while the plant was at 87% Power, the Train B Safeguards Protection System Safety Injection System (SIS) Go Test was performed. This test actuates individual Safeguards output relays and verifies the operation of required SIS components. SIS components that cannot be tested in this manner during power operation are temporarily blocked from actuating when other components that are controlled by the same Safeguards relay are tested.

The procedure had operators actuate Safeguards relay K603B. This relay will send actuation signals to several charging and safety injection system valves and trip signals to the Train B Containment Air Recirculation Fans.- One of the valves that receive a signal from this relay is [2CHS-MOV310). This valve is a containment isolation valve in the normal charging flowpath to ,

the Reactor Coolant System. In order to prevent the closure of (2CHS-MOV310) during power operation, its breaker is opened before the relay is actuated. The procedure has the operators verify the breaker's contactor actuates in response to the SIS signal. After the SIS signal and the breaker contactor are reset, the procedure has operator reclose the valve's breaker. During the performance of this test, the operators reclosed the breaker for l2CHS-MOV310) before the SIS signal was reset. This caused the va: ve to close, .

isolating charging to the "eactor Coolant System.

l Corrective Actions

1) Operators reset the SIS signal and restored charging to the i Reactor Coolant System.

l l 2) A Human Performance Evaluation System analysis of this event is being performed. The results of the evaluation and any

! subsequent corrective action will be documented in a

supplemental report, l

Previous Similar Events There was one previous event (LER 88-016) involving an inadvertent ESF actuation duri.ng Go testing when an operator did not properly block a required component.

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Safety EvaluatiQD There were no safety implications due to this event. The charging <

system is used for long term Reactor Coolant chemistry control, 4 Reactor Coolant activity level control, and Reactor Coolant  !

inventory control. Temporary loss of charging during power  ;

operations does not induce a plant transient or otherwise affect the safe operation of the plent. This event was bounded by UFSAR Analysis Section 15.5.1, " Inadvertent Operation of Emergency Core Cooling System During Power Operation." l.

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