05000412/LER-1995-001, :on 950115,TS 3.0.3 Entered Due to Isolation of CR Habitability Air Bottle Subsystem.Caution Tags Placed on Power Cables for RM-RM-219A & RM-RM-219B to Warn Technicans of Instruments Interactions

:on 950115,TS 3.0.3 Entered Due to Isolation of CR Habitability Air Bottle Subsystem.Caution Tags Placed on Power Cables for RM-RM-219A & RM-RM-219B to Warn Technicans of Instruments Interactions

ML20078P636
Person / Time
Site:	Beaver Valley
Issue date:	02/14/1995
From:	Freeland L DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-95-001, LER-95-1, ND3MNO:3643, NUDOCS 9502170161
Download: ML20078P636 (5)

LER-1995-001, on 950115,TS 3.0.3 Entered Due to Isolation of CR Habitability Air Bottle Subsystem.Caution Tags Placed on Power Cables for RM-RM-219A & RM-RM-219B to Warn Technicans of Instruments Interactions

Event date:
Report date:
4121995001R00 - NRC Website

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Stuppingport. PA 150774K)4 February 14, 1995 ND3MNO:3643 Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, Licensee No. NPF-73 LER 95-001-00 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 95-001-00,10 CFR 50.73.a.2.i.B, " Condition Prohibited by Technical Specifications - Entry Into Technical Specification 3.0.3 Due to Isolation of Control Room Habitability Air Bottle Subsystem".

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ci L. R. Freeland General Manager Nuclear Operations DAM: mar Attachment i

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9502170161 950214 3

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February 14,1995

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Mr. T. T. Martin, Regional Administrator

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United States Nuclear Regulatory Commission j

Region 1 l

475 Allendale Road j

King of Prussia, PA 19406 i

f Mr. G. E. Edison l

i BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, DC 20555 i

Larry Rossbach

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Nuclear Regulatory Commission, BVPS Senior Resident Inspector i

i J. A. Hultz Ohio Edison i

76 S. Main Street l

Akron, OH 44308 i

Mark Burns Centerior Energy 6200 Oak Tree Blvd.

l Independence, OH 44101-4661 l

INPO Records Center 700 Galleria Parkway l

Atlanta, GA 30339-5957 l

I Mr. Roben Malers i

Department of Environmental Resources P.O. Box 8469 State Office Building 13th Floor Harrisburg, PA 17105-8469 i

Director, Safety Evaluation & Control l

Virginia Electric & Power Co.

P.O. Box 26666 One James River Plaza i

Richmond, VA 23261 l

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AltS ! R ACT (1. muted to 1400 spaces, i c., approumately 15 ungle spawd typewritten hnes) (16) i On January 15.1995 at 0055 hours6.365741e-4 days <br />0.0153 hours <br />9.093915e-5 weeks <br />2.09275e-5 months <br />, while performing maintenance on a Containment liigh Range Radiation Monitor at Beaver Valley Power Station (BVPS) Unit I, an electrical noise spike caused a spurious High Radiation Alarm on a Control Room Radiation Monitor and actuated the Control Room Emergency liabitability System. Following confirmation that the actuating signal was invalid, operators isolated the air bottle subsystem uhich had begun discharging into the control room. Both BVPS

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Unit I and Unit 2 Control Rooms are in a common envelope, By manually isolating this subsystem at 0057 hours6.597222e-4 days <br />0.0158 hours <br />9.424603e-5 weeks <br />2.16885e-5 months <br />, BVPS Unit 2 l

intentionally entered Technical Specification 3 0.3.

After resetting the spurious high radiation signal, the Air Bottle subsystem was unisolated and the Control Room liabitability System was returned to normal system arrangement. The station exited Technical Specification 3 0.3 at 0118 hours0.00137 days <br />0.0328 hours <br />1.951058e-4 weeks <br />4.4899e-5 months <br />. Since the Control Room Emergency liabitability Sy stem Air Bottles were isolated, this event is being reported in accordance with 10CFR50.73.a 2.i.B as a condition prohibited by Technical Specifications.

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SI/JULNI'IAL REvlSION Beaver Valley Power Station Unit 2 050(X)412 YEAR NUMBER NUMBER 20F3 J

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DESCRIPTION OF EVENT

On January 15,1995, at 0055 hours6.365741e-4 days <br />0.0153 hours <br />9.093915e-5 weeks <br />2.09275e-5 months <br />, with Beaver Valley Power Station (BVPS) Unit 1 in Operating Mode 6 and BVPS Unit 2 in Operating in Mode I at approximately 100% power, Instrument and Control Technicians at Unit I were replacing the Containment High Range Radiation Monitor drawer RM-RM-219A. While they were in the process of connecting the AC power connector to RM-RM-219A, the Control Room Radiation Monitor, RM-RM-218A, located in the same cabinet, began to count up. A High Radiation Alarm was subsequently received on RM-RM-218A.

Immediately following the alarm, the Control Room Emergency Habitability Air Bottles began discharging into the Control Room, as they are designed to do upon receipt of a high radiation signal from RM-RM-218A or B. Both BVPS Unit I and Unit 2 Control Rooms are in the same envelope. After verifying that the no valid Control Room Emergency Habitalslity System actuation signals existed, an operator was dispatched to isolate the air bottles in accordance with operating procedure 1/2OM-44 A.4 A. A, " Post Control Room Habitability Sy stem Actuation / Recovery" This action was taken to maintain air bottle pressures above the 1825 psig limit of Technical Specification 3.7.7. and climinate the need to recharge them prior to restoring them operable. At 0057 hours6.597222e-4 days <br />0.0158 hours <br />9.424603e-5 weeks <br />2.16885e-5 months <br /> the Control Room Emergency Habitability System Air Bottles were isolated and BVPS Unit 2 entered Technical Specification 3.0.3.

After resetting the spurious RM-RM-218A high radiation signal, the Control Room Habitability System was returned to normal system arrangement. The bottled air subsystem was unisolated at 0118 hours0.00137 days <br />0.0328 hours <br />1.951058e-4 weeks <br />4.4899e-5 months <br /> and BVPS Unit 2 cxited Technical Specification 3.0.3 Since the air bottles remained above 1825 psig. the time the station operated in Technical Specification 3.0.3 was limited to 21 minutes.

CAUSE OF EVENT

The cause of this event was determined to be electrical noise spiking on RM-RM-218A produced when the power connector was being reinstalled on RM-RM-219A. The Containment High Range Radiation Monitors and the Control Room Radiation Monitors are located in the same cabinet. This close proximity makes them susceptible to electrical noisc produced when either is energized.

CORRECTIVE ACTIONS

1. As an interim precaution, Caution Tags have been placed on the power cables for RM-RM-219A and RM-RM-219B to warn technicians of the instrumcnt interactions. Permanent caution tags will be installed near the control switches for RM-RM-219A and RM-RM-219B cautioning that operation of the power switch could cause RM-RM-218A and RM-RM-218B H1-H1 Alarm and Control Room Emergency Breathing Air Pressurization System (CREBAPS) actuation.

2. Instrument and Control calibration procedures for Containment High Range Radiation Arca Monitors RM-RM-219A and RM-RM-219B will be resised to include steps for removal and restoration of RM-RM-218A and RM-RM-218B to help preclude the undesired actuation of the CREBAPS system.

3. The cause of the undesired instrument response will be evaluated to determine if additional actions or modifications are warranted to preclude undesired CREBAPS actuations.

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REPORTABILITY

This written report is being submitted in accordance with 10 CFR 50.73(2)(i)(B) as a condition prohibited by Technical Specifications and ently into Technical Specification 3.0.3.

SAFETY IMPLICATIONS There were minimal safety implications due to this event. The Control Room Habitability System functioned as designed. Since the air bottles were isolated in a timely manner, the air bottle subsystem pressure remained above the 1825 psig limit required by Technical Specification 3.7.7. This minimized the time spent in Technical Specification 3.0.3 by climinating the need to recharge the bottles. The subsystem was inoperable only because it was manually isolated for 21 minutes during which time it could have been returned to service if a valid need arose.

SIMILAR EVENTS

Beaver Valley Power Station Unit I has submitted LER l-93-003 on November 3,1993, concerning Control Room Habitability Air Bottle Subsystem being manually isolated and entry into Technical Specification 3.0.3.

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