ML20059L126

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Discusses GL-89-10,Suppl 5, Inaccuracy of Motor-Operated Valve Diagnostic Equipment. Advises That During Future Insp,Nrc Staff Will Address Util Resolution of MOV Diagnostic Equipment Accuracy Issues
ML20059L126
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 01/26/1994
From: Robert Stransky
Office of Nuclear Reactor Regulation
To: Storz L
CENTERIOR ENERGY, TOLEDO EDISON CO.
References
GL-89-10, TAC-M87940, NUDOCS 9402030196
Download: ML20059L126 (3)


Text

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                          .[                                     january 26, 1994
               . Docket No. 50-346                                                                                '

Mr. Louis F. Storz  ! Vice President, Nuclear - Davis-Besse Centerior Service Company i

                  -c/o Toledo Edison Company
  • Davis-Besse-Nuclear Power Station .

5501 North State Route 2 Oak Harbor, Ohio 43449 {

Dear Mr. Storz:

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SUBJECT:

GENERIC LETTER 89-10, SUPPLEMENT 5, " INACCURACY OF MOTOR-0PERATED VALVE DIAGNOSTIC EQUIPMENT" (TAC N0. M87940). , 10n June 28, 1993, the NRC staff issued Supplement 5, ' Inaccuracy of Motor-- Operated Valve Diagnostic Equipment," to Generic Letter (GL) 89-10,1" Safety-- Related Motor-0perated Valve Testing and Surveillance," requesting nucleari ,! power plant licensees and construt.lon permit holders to (1) re-examine their. , motor-operated valve (MOV) programs and to identify measures taken to account:  : for. uncertainties in properly setting valve operating thrust to ensure 1 , operability, and '(2) evaluate the schedule necessary to consider th'e new information'on MOV diagnostic equipment inaccuracy-and to take appropriate.  : action in response to'that information. Within 90' days of receipt ofs Supplement 5 to GL 89-10, licensees were required.to (1) notify.the NRC staff ' of the diagnostic equipment used to confirm the . proper size, .or.to~ establish q settings, for safety-related MOVs, and (2) report whether they had.taken - actions cr- planned to take actions (including schedule) to address the new information on the accuracy of MOV diagnostic equipment. The staff has reviewed the' responses, and has found that, for the most part, , licensees pd permit holders have been actively addressing.the uncertainties t regarding 4 sccuracy of MOV diagnostic equipment. .The increased inaccuracy- l

          .,       of MOV diar vi ic equipment can raise questions regarding (1) the adequacy 'of -               ,

torque' switch settings to provide sufficient thrust while not exceeding thrust. . or torque _ structural limits and (2) the capability of actuator' motors at' . current settings. In their responses, licensees and permit'. holders indicated that many MOVs had the potential for underthrusting or overthrusting as a -l result of the higher than. expected inaccuracy of MOV diagnostic:' equipment. , Consequently, some licensees reported Vaat MOVs have been retested, ' adjusted, i or modified to. resolve the concerns regarding the accuracy of MOV diagnostic ~ equipment. . In your response dated September 28, 1993, you stated that Toledo Edison-(TE) ., had.previously used MOV diagnostic equipment manufactured by -ITI-M0 VATS, but  ; currently uses Liberty Technologies' VOTES; equipment. You also stated that, l

                  -in response. to the Liberty Technologies' 10 CFR .Part 21 notice,: dated October, 2,1992, TE had re-evaluated its V0TES. test data. Your letter stated:that        .
                                                                                                               .i Teight MOVs were found to need retesting. Four' of these MOVs had bun retested '                !

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                                                                                     % .. r-Mr. Louis F. Storz                                                 January 26, 1994 in the spring of 1993 and adjusted. The other four MOVs were atave the target thrust, but below the maximum limit and will t*e retested at a later date. You stated that TE's procedures for calculations and testing had been revised.

Your letter further stated that 50 MOVs that had been set up using the ITI-MOVATS thrust measuring device (TMD) had not yet been rstested using the VOTES equipment. You stated that TE had evaluated those MOVs and found no problems. During a future inspection, the NRC staff will address Toledo Edison's resolution of the MOV diagnostic equipment accuracy issue. Particularly, thb staff will discuss (1) TE's basis for the continuing operability of the eight M0Ve setup with VOTES that were found to need retesting, and (2) the method used by TE to evaluate the MOVs setup with the TMD and the results of that evaluation. This completes NRC staff efforts with regard to TAC No. M87940. If you have any questions regarding this issue, please call me at (301) 504-1346. Sincerely, ORIGINAL SIGNED BY Robert J. Stransky,. Project Manager Project Directorate 111-3 Division of Reactor Projects Ill/1,/V Office of Nuclear Reactor Regulation CC: See next page DlHBIMR0!!

Docket. File. JNorberg RStransky MRushbrook NRC & Local PDRs JRoe EGreenman, Rill TScarbrough PDill-3 Rdg OGC AHansen Jilannon ACRS (10) JZwolinski )j OFFICE LA:PD33 PM;PD33 PD:kk NAME MRuMd>ok hk JHannon DATE 1/h/94 1 / 74 / 9 4 1/ 3// 94 COPY Ye /Ito k/Ho Yeb/No OFFICIAL RECORD COPY FILENAME: G:\DAVISBES\DB87940.LTR
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i Mr. Louis F. Storz Davis-Besse Nuclear Power Station Toledo Edison Company Unit No. 1 cc: Mary E. O'Reilly Robert E. Owen, Chief Centerior Energy Corporation Bureau of Radiological Health

  • 300 Madison Avenue Services Toledo, Ohio 43652 Ohio Department of Health Post Office Box 118 Mr. William T. O'Connor, Jr. Columbus, Ohio 43266-0118 Manager - Regulatory Affairs Toledo Edison Company Attorney General Davis-Besse Nuclear Power Station Department of Attorney General 5501 North State - Route 2 30 Eest Broad Street
  • Oak Harbor, Ohio 43449 Columbus, Ohio 43216 Gerald Charnoff, Esq. Mr. James W. Harris, Director i Shaw, Pittman, Potts Division of Power Generation i and Trowbridge Ohio Department of Industrial l 2300 N Street, N. W. Regulations Washington, D. C. 20037 P. O. Box 825  ;

Columbus, Ohio 43?l6 , Regional Administrator, Region III U. S. Nuclear Regulatory Commission Ohio Environmental Protection Agency .; 801 Warrenville Road DERR--Compliance Unit Lisle, Illinois 60532-4351 ATTN: Zack A. Clayton ', P. O. Box 1049 Mr. Robert B. Borsum Columbus, Ohio 43266-0149 Babcock & Wilcox Nuclear Power Generation Division State of Ohio 1700 Rockville Pike, Suite 525 Public Utilities Commission Rockville, Maryland 20852 180 East Broad Street Columbus, Ohio 43266-0573 Resident Inspector  : U. S. Nuclear Regulatory Commission Mr. James R. Williams [ 5503 N. State Route 2 State Liaison to the NRC Dak Harbor, Ohio 43449 Adjut. int General's Department Office of Emergency Management , Mr. Donald C. Shelton Agency { Senior Vice President - Nuclear 2825 West Granville Road Centerior Service Company Columbus, Ohio 43235-2712  ; 6200 Dak Tree Boulevard j Independence, Ohio 44101 Mr. John K. Wood, Plant Manager Toledo Edison Company Davis-Besse Nuclear Power Station , 5501 North State Route 2  ! Oak Harbor, Ohio 43449 ' e}}