ML18041A190

Special Rept:On 890414,triaxial Time History Accelerometer Horizontal Trigger Circuits Identified as Inoperable. Caused by Incorrect Calibr Procedure.Surveillance Procedure Immediately Revised to Reflect Correct Setpoint Values

ML18041A190
Person / Time
Site:	Beaver Valley
Issue date:	04/24/1989
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ND3MNO:1867, NUDOCS 8904280274
Download: ML18041A190 (8)

Text

, ACCELERATED D)STPl~U>ON DEMONSTRA+N SYSTEM h REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:8904280274 DOC.DATE: 89/04/24 NOTARIZED:

NO DOCKET I FACIL:50-412 Beaver Valley Power Station, Unit 2, Duquesne Light C 05000412 AUTH.NAME AUTHOR AFFILIATION NOONAN,T.P.

Duquesne Light Co.RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special rept:on 890414,triaxial time history accelerometer horizontal trigger circuits identified as inoperable.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL (SIZE: TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.NOTES:LPDR 2cys Transcripts.

LPDR 2cys PDR Documents.

Application for permit renewal filed.05000412 8 RECIPIENT ID CODE/NAME PD1-4 LA TAM,P INTERNAL: ACRS MICHELSON ACRS WYLIE AEOD/DSP/TPAB DEDR5 NRR/DEST/ADE 8H NRR/DEST/CEB 8H NRR/DEST/ICSB 7 NRR/DEST/MTB 9H NRR/DEST/RSB 8E NRR/DLPQ/HFB 10 NRR/DOEA/EAB 11 N~B-IB 9A REG E 02 RES/DSR/PRAB EXTERNAL: EGGG WILLIAMS, S L ST LOBBY WARD NRC PDR NSIC MURPHYI G A NOTES: COPIES LTTR ENCL 1 1 1 1 1 1 1 1'1 1 1 1 1 1 1 1 1 1 1 1 1 1 1'1 1 1 1 1 1 1 1 1 4 4 1 1 1 1 1 1 2 2 RECIPIENT ID CODE/NAME PD1-4 PD ACRS MOELLER AEOD/DOA AEOD/ROAB/DSP IRM/DCTS/DAB NRR/DEST/ADS 7E NRR/DEST/ESB 8D NRR/DEST/MEB 9H NRR/DEST/PSB 8D NRR/DEST jSGB 8D NRR/DLPQ/QAB 10 NRR/DREP/RPB 10 NUDOCS-ABSTRACT RES/DSIR/EIB RGN1 FILE 01 FORD BLDG HOY,A LPDR NSIC MAYS,G COPIES LTTR ENCL 1 1 2 2 1 1 2 2 1 1 1 0 1 1 1 1 1 1 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 8 I D RIDSII RECIPIENIS

~PLEASE HELP US K)REDUCE WMHZ!CXRKACI'%HE DOCUMENI'XWIBDL DESK, ROOM Pl-37 (EXT.20079)KO ELZHZHATE KKlR NAME FRY DISHGBVZION LXSIS POR DOC%M&IS YOU DGN~T NEZD!D S TOTAL NUMBER OF COPIES REQUIRED: LTTR 46 ENCL 45 E'

gled~Duqueem Lt Nuclear Group P.O.Box 4 Shippingport.

PA 15077~Telephone (412)393~April 24, 1989 ND3MNO: 1867 Beaver Valley Power Station, Unit No.2 Docket No.50-412, License No.NPF-73 S ecial Re ort United States Nuclear Regulatory Commission Document Control Desk Washington

, DC 20555 Gentleman:

In accordance with Appendix A, Beaver Valley Technical Specification 3.3.3.3,"Seismic Instrumentation," the following Special Report is submitted....

This report.is required when the conditions specified in Technical Specification 3.3.3.3.b are not satisfied.

On April 14, 1989, 2ERS-ACS-1 and-3, Triaxial Time History Accelerometer horizontal trigger circuits for the Containment Structure and the Switchyard, were identified as being inoperable since May, 1987, as a result of an incorrect calibration procedure.

On April 1, 1989, a Response Spectrum Analyzer Trouble alarm was observed, indicating an internal fault.A maintenance work request was generated to correct this condition.

During troubleshooting of the central control cabinet, with a vendor representative present, these accelerometer trigger circuits were identified as having incorrect setpoints.

The accelerometer analog trigger circuits cause tape recording of all three directional sensor inputs and annunciation, when the setpoint value is reached.'he accelerometer trigger circuit cards contain switches which provide annunciation when their respective setpoint is reached.The setpoints are values measured in g-forces.It was discovered that the horizontal trigger setpoint value t0.0lg)for both accelerometer trigger card were set at the'vertical alarm switch setpoint value (0.037g).The cause for this event was due to a deficient surveillance procedure which incorrectly specified the setpoint values.39042A0274 8904>4 PDR ADOCK 050004i2 PDr.

C April 24, 1989 ND3MNO:1867 Page 2 The surveillance procedure was immediately revised to reflect the correct setpoint values and the accelerometer trigger circuits were calibrated to the correct values.There were no safety implications to the public as a result of this event because no seismic activity occurred during the entire period the horizontal accelerometer trigger circuits were incorrectly calibrated.

The trigger circuits function to initiate automatic magnetic tape recording of the seismic event, no other automatic plant actuations are designed to occur from a trigger circuit.In addition, the vertical accelerometer trigger circuits were correctly calibrated and operational throughout the entire time period.Very truly yours, T.P.N onan General Manager Nuclear Operations JT/c j Attachment

April 24, 1989 ND3MNO:1867 Page three CC'r.William T.Russell Regional Administrator United States Nuclear Regulatory Commission Region 1 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 Mr.Alex Timme, CAPCO Nuclear Projects Coordinator Toledo Edison INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, GA 30339 G.E.Muckle, Factory Mutual Engineering, Pittsburgh Mr.J.N.Steinmetz, 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 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 One James River Plaza Richmond, VA 23261 0