ML18038A763

Special Rept:On 890829,seismic Monitoring Instrumentation Declared Inoperable Over 30 Days Due to Inability to Successfully Complete Calibr Procedure.Equipment Vendor Contacted to Discuss Resolution of Problems

ML18038A763
Person / Time
Site:	Nine Mile Point
Issue date:	10/10/1989
From:	Joseph Willis NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NMP56851, NUDOCS 8910190145
Download: ML18038A763 (6)

Text

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ACCESSION NBR:8910190145 DOC.DATE: 89/10/10 NOTARIZED: NO , DOCKET FACIL:50-410 Nine Mile Point Nuclear Station, Unit 2, Niagara Moha 05000410 AUTH. NAME AUTHOR AFFILIATION WILLIS,J.L. Niagara Mohawk Power Corp.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

Special rept:on 890829,inoperability of seismic monitoring S UBJECT:

instrumentation.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR TITLE: 50.73/50.9 Licensee Event, Report (LER), Incident Rpt, etc.

i ENCL J SIZE:

NOTES:'ECIPIENT RECIPIENT COPIES COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD1-1 LA 1 1 PD1-1 PD 1 1 SLOSSON,M 1 1 BENEDICT,R 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DS P/TPAB 1 1 AEOD/ROAB/DSP 2 2 DEDRO 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSB 8D 1 1 NRR/DEST/RSB 8E 1 1 NRR/DEST/SGB 8D 1 1 NRR/DLPQ/HFB 10 1 1 NRR/DLPQ/PEB 10 1 1 NRR/DOEA/EAB 11 1 1 NR~RDRE~RPB 10 2 2 NUDOCS-ABSTRACT 1 1 G FILE 02 1 1 RES/DSIR/EIB 1 1 CH1 FILE 01 1 1 EXTERNAL EG&G WILLIAMSE S 4 4 L ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC MAYS,G 1 1 NSIC MURPHY,G.A 1 1 NUDOCS FULL TXT 1 1 NOTE 'IO ALL RIDS" RZCZPZHQS'URSE HELP US Io REKKZ %RKRf CXNZACZ GHE DtXXMWZ CXNZROL DESKi RXM P1-37 (EXP. 20079) %0 ELQMRTH KRR MHE PKN DISTRIBUTICN LISTS FOR DOCQMEÃIS KRJ DCSERT NEEDt TOTAL NUMBER OF COPIES REQUIRED: LTTR 39 ENCL 39

NMP 56851 NINE MILE POINT NUCLEAR STATION/P.O. BOX 32. LYCOMING, N.Y. 13093/TELEPHONE (315) 343-2110 October >0, 1989 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 RE: Docket No. 50-410 SPECIAL REPORT Gentlemen:

In accordance with Nine Mile Point Unit 2 (NMP2) Technical Specification (TS) 3.3.7.2 ACTION Statement a., we are submitting the following Special Report concerning the inoperability of the Seismic Monitoring Instrumentation (specifically, the Triaxial Response Spectrum Recorder, Primary Containment Residual Heat Removal Piping Penetration Elevation 294'6").

On August 28, 1989 at 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br />, with the reactor mode switch in "RUN",

the Triaxial Response Spectrum Recorder (2ERS-RSR3B) was declared 'inoperable.

It was found inoperable during the performance of procedure N2-ISP-ERS-R104 (Operating Cycle Calibration of Seismic Monitoring Response Spectium Recorders Instrument Channels). The East/West Horizontal (E/W), and North/South Horizontal (N/S) permanent record plates were found to have indications that were determined not to be a result of seismic activities. Additionally, certain sensor/accelerometers (16 sensors are located within each E/W and N/S Triaxial Response Spectrum Recorder) failed to meet calibration requirements.

Failure to return the monitors to an operable status within 30 days requires submission of this Special Report of the U.S. Nuclear Regulatory Commission within 10 days as specified in TS 3.3.7.2 ACTION Statement a.

The immediate cause of the failure to restore the seismic monitors to operable status within 30 days was the inability to successfully complete calibration procedure N2-ISP-ERS-R104. Symmetry test accuracies of 5X required by procedure could not be achieved. Also, frequency test checks performed on certain accelerometers/sensors were found to be damaging to these sensors.

A Special Report was issued (copy attached) on January 16, 1989 documenting that recorder 2ERS-RSR3B had been declared inoperable due to indications of seismic activities being found on permanent record plates, yet

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'age 2 NMP ~68~1 no evidence of an event existed. It was determined that background vibration was causing false recordings.

Immediate corrective action included contacting equipment vendor, Engdahl Enterprises, to discuss resolution of; (1) inability of NMPC Instrument and Controls Department to meet vendor manual calibration requirements for the Triaxial Response Spectrum Recorder (2ERS-RSR3B); and (2) the damaging of certain sensor/accelerometers during surveillance frequency checks as outlined in vendor manual.

Engdahl Enterprises has provided revised vendor manual frequency calibration data which omit frequency checks for certain sensors which could be susceptible to damage. Additionally, the vendor manual symmetry test data for the seismic monitoring recorders has been revised to change accuracies from 5X to 8X.

A Problem Report (PR) 808835 has been written recommending vendor manual changes be made to include new vendor specifications.

Corrective actions outlined in the January 16, 1989 Special Report detailed steps that have been taken to monitor background vibrations and their effects on seismic monitor (2ERS-RSR3B). New permanent record plates were installed and surveillances of these have been completed. Based on these results, a new installation location for this monitor will be provided by NMPC Engineering. A temporary surveillance vibration monitoring program will be initiated to measure background vibration at this new location. If acceptable low level readings are observed, a Modification Request will be initiated to permanently relocate seismic vibration monitor (2ERS-RSR3B) to this location.

A Technical Specification change will then be submitted to the V.S. Nuclear Regulatory Commission prior to completion of the first refueling outage to change Table 3.3.7.2-1 to reflect this new location. This seismic monitor will remain inoperable until the above actions have been completed.

Sincerely, J. L. Willis General Superintendent Nuclear Generation JLW/GB/mdiv (1002V)

At tachment cc: Regional Administrator, Region 1 Sr. Resident Inspector, W. A. Cook