ML17264A841

Special Rept:On 970225,declared Sping Air Ejector Radiation Monitor R-15A Inoperable Due to Calibr Activities.Replaced Detector & Cable for Channel 9,tested Satisfactorily & Returned R-15A to Service

ML17264A841
Person / Time
Site:	Ginna
Issue date:	03/24/1997
From:	Mecredy R ROCHESTER GAS & ELECTRIC CORP.
To:	Vissing G NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9704010365
Download: ML17264A841 (5)

Text

CATEGORY REGULATORY INFORMATION DISTRIBUTION YSTEM (RIDS)

ACCESSION NBR:9704010365 DOC.DATE: 97/03/24 NOTARIZED: NO DOCKET FACIL:50;244 Robert Emmet Ginna Nuclear Plant, Unit 1, Rochester G 05000244 AUTH. NAME AUTHOR AFFILIATION MECREDY,R.C. Rochester Gas & Electric Corp.

RECIP.NAME RECIPIENT AFFILIATION VISSING,G.S.

SUBJECT:

Special rept:on 970225,declared SPING air Ejector Radiation Monitor R-15A inoperable due to calibr activities. Replaced detector & cable for Channel 9,tested satisfactorily &

returned R-15A to service.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.

NOTES:License Exp date in accordance with 10CFR2,2.109(9/19/72). 05000244 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD1-1 PD VISSING,G.

INTERNAL: ~ A~EO g RAB AEOD/SPD/RRAB NRR/DE/ECGB 1

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Q 1 1 NRR/DE/EMEB 1 NRR/DRCH/HHFB 1 NRR/DRCH/HICB 1-NRR/DRCH/HOLB 1 NRR/DRCH/HQMB 1 NRR/DRPM/PECB 1 NRR/DSSA/SPLB 1 NRR/DSSA/SRXB 1 RES/DET/EIB 1 RGN1 FILE 01 1 EXTERNAL: L ST LOBBY WARD LITCO BRYCE, J H 1 NOAC POOREgW. NOAC QUEENER,DS 1 NUDOCS FULL TXT NRC PDR E

NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 24 ENCL

li lND ROCHESTER GAS AND ElECTRIC CORPORATlON ~ B9 EAST AVENUE, ROCHESTER, N', Y ld6d9 %01 ~ AREA CODE 716 546 27M ROSES C, hhECREDY V ce Pres cent Nvcieor Operotions March 24, 1997 U.S. Nuclear Regulatory Commission Document Control Desk Attn: Guy S. Vissing Project Directorate I-1 Washington, D.C. 20555

Subject:

Thirty (30) Day Special Report Inoperable Radiation Monitor R.E. Ginna Nuclear Power Plant Docket No. 50-244

Dear Mr. Vissing:

Radiation Accident Monitoring Instrument R-15A was inoperable for more than seven days. In accordance with the Ginna Station Offsite Dose Calculation Manual (ODCM) Procedure CHA-RETS-ODCM,Section III.A.2.a.iv. and Table III-2, the following constitutes a Special Report outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to operable status.

On February 25, 1997, at 0942 EST, SPING Air Ejector Radiation Monitor R-15A was declared inoperable for calibration, per calibration procedure CPI-RAD-MON-SPING4. This calibration normally takes more than one day to peform.

During calibration activities on February 26, R-15A Channel 9 (high range noble gas) was exhibiting inconsistent readings. Further examination revealed a loose connector between the Channel 9 detector and the junction box. Tightening the connector seemed to correct the problem.

The calibration continued over the next two days, and no other anomalies were noted. On Friday, February 28, when the calibration involving the check sources began, Channel 9 again exhibited inconsistent readings. Resolution of this problem required replacement of the detector and cable for Channel 9. These activities could be completed in less than one day. Thus, overtime was not considered necessary, and further work was suspended for the weekend.

97040 i 0365 'st70324 PDR ADOCK 05000244 S PDR

Page 2 On Monday, March 3, a corrective work package was prepared which provided directions to replace the Channel 9 detector and cable. After completing the corrective work and preparing to restore R-15A to service, I&C noticed that another R-15A channel (Channel 8, gamma background) was not functioning as expected. Correction of this problem was estimated to occur after the 7 day clock expired, even with around the clock efforts. The decision was made to defer corrective work until the next day, which would extend R-15A inoperability beyond 7 days.

On March 4, the corrective work package was modified to include the replacement of Channel 8 detector. This replacement proceeded more expeditiously than expected. After this detector was replaced, calibration was completed on the remainder of the R-15A system. R-15A was tested satisfactorily. R-15A was documented as returned to service at 1049 EST on March 4, 67 minutes past the 7 day limit.

Very truly yours, Robert C. Mecr y xc: Mr. Guy S. Vissing (Mail Stop 14C7)

PWR Project Directorate I-1 Washington, D.C. '20555 U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 Ginna Senior Resident Inspector

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