ML17265A706

Forwards LER 98-003-02,re Actuations of CR Emergency Air Treatment Sys.All Creats Actuations,Including Those Originally Believed to Be Valid Actuations,Were,In Fact Invalid Actuations

ML17265A706
Person / Time
Site:	Ginna
Issue date:	07/22/1999
From:	Mecredy R ROCHESTER GAS & ELECTRIC CORP.
To:	Vissing G NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17265A707	List: ML17265A706 ML17265A708
References
NUDOCS 9907280113
Download: ML17265A706 (3)

Text

CATEGORY REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9907280113 DOC.DATE: 99/07/22 NOTARIZED: NO DOCKET FACXL:50-244 Robert Emmet Ginna Nuclear Plant, Unit 1, Rochester G 05000244 AUTH. NAME AUTHOR AFFILIATION MECREDY,R.C. Rochester Gas 8 Electric Corp..-

RECXP.NAME RECIPIENT AFFILIATION VISSZNG,G.S.

SUBJECT:

Forwards LER 98-003-02,re actuations of CR emergency air treatment sys.All'REATS actuations,including those originally believed to be valid actuations,were, in fact invalid actuations.

DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR ENCL J 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 ZD CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL LPD1-1 PD 1 1 VZSSING,G. 1 1 INTERNAL 1 1 NRR/DIPM/ZOLB 1 1

'/DRIP/REXB 1 1 ~

NRR/DSSA/SPLB 1 '

RES/DET/ERAB 1 1 RES/DRAA/OERAB 1 1 RGN1 FILE 01 1 1 EXTERNAL: L ST LOBBY WARD 1 1 LMITCO MARSHALL 1 1 NOAC POORE,W. 1 1 NOAC QUEENER,DS 1 ~ 1 NRC PDR 1 1 NUDOCS FULL TXT 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT LIS'R DESK (DCD) ON EXTENSION 415-2083 THE DOCUMENT CONTRi FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 15 ENCL 15

0 4ND ROCHESTER GAS AND ElECTRIC CORPORATION ~ 89 EAST AtrrENUE, ROCHESTER, N.Y. Id6d9-OOOI AREA CODE 716 5'-2700 l'OBERT C. MECREDY Vice President Nvcleor Operotions July 22, 1999 U.S. Nuclear Regulatory Commission Document Control Desk Attn: Guy S. Vissing Project Directorate I-1 Washington, D.C. 20555

Subject:

LER 1998-003, Revision 2, Actuations of Control Room Emergency Air Treatment System Due to Invalid Causes R.ED Ginna Nuclear Power Plant Docket No. 50-244

Dear Mr. Vissing:

In accordance with 10 CFR 50.73, Licensee Event Report System, item (a) (2) (iv), which requires a report of, "any event or condition that resulted in manual or automatic actuation of any Engineered Safety Feature (ESF), including the Reactor Protection System (RPS)", the attached Licensee Event Report LER 1998-003 (Revision 2) is hereby submitted.

It has been determined that there were various degraded components in the Control Room Radiation Monitoring system.

These degraded components resulted in electronic spikes in the readings on the monitors. The higher concentrations of Radon and Radon decay products caused the margin to the trip setpoint to be reduced. Thus, in the presence of elevated Radon levels, the electronic spikes caused a setpoint to be exceeded. When elevated Radon levels were not present, larger spikes also caused a setpoint to be exceeded. The degraded components, resulting in electronic spikes, were the root cause of the Control Room Emergency Air Treatment System (CREATS) actuations. All CREATS actuations, including those originally believed to be valid actuations, were, in fact, invalid actuations.

Very truly yours, F'

Robert C. Mecred 9907280i13 990722 PDR ADOCK 05000244 8 PDR

xc: Mr. Guy S. Vissing (Mail Stop 8C2)

Project Directorate I-1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 U.S. NRC Ginna Senior Resident Inspector