ML20059L342
| ML20059L342 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 01/28/1994 |
| From: | Siegel B Office of Nuclear Reactor Regulation |
| To: | Dennis Morey SOUTHERN NUCLEAR OPERATING CO. |
| References | |
| GL-89-10, TAC-M87946, TAC-M87947, NUDOCS 9402040104 | |
| Download: ML20059L342 (4) | |
Text
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'o UNITED STATES
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NUCLEAR REGULATORY COMMISSION n
h WASHINGTON, D C. 20555 January 28, 1994 Docket Nos. 50-348 and 50-364 Mr. D. N. Morey, Vice President Southern Nuclear Operating Co., Inc.
Post Office Box 1295 Birmingham, Alabama 35201-1295
Dear Mr. Morey:
SUBJECT:
GENERIC LETTER 89-10, SUPPLEMENT 5, " INACCURACY OF MOTOR-0PERATED VALVE DIAGNOSTIC EQUIPMENT" JOSEPH M. FARLEY NUCLEAR PLANT, UNITS 1 AND 2, (TAC NOS. M87946 AND M87947)
On June 28, 1993, the NRC staff issued Supplement 5, " Inaccuracy of Motor-Operated Valve Diagnostic Equipment," to Generic Letter (GL) 89-10, " Safety-Related Motor-0perated Valve Testing and Surveillance," requesting nuclear power plant licensees and construction permit holders (1) to re-examine their motor-operated valve (M0V) programs and to identify measures taken to account for uncertainties in properly setting valve operating thrust to ensure operability, and (2) to evaluate the schedule necessary to consider the new information on MOV diagnostic equipment inaccuracy and to take appropriate action in response to that information. Within 90 days of receipt of Supplement 5 to GL 89-10, the licensees were required (1) to notify the NRC staff of the diagnostic equipment used to confirm the proper size, or to establish settings, for safety-related MOVs, and (2) to report whether they had taken actions or 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, the licensees and permit holders have been actively addressing the uncertainties regarding the accuracy of M0V diagnostic equipment.
The increased inaccuracy of MOV diagnostic 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, the licensees and permit holders indicated that many NOVs had the potential for underthrusting or overthrusting as a result of the higher than expected inaccuracy of MOV diagnostic equipment.
Consequently, some licensees reported that MOVs have been retested, adjusted, or modified to resolve the concerns regarding the accuracy of M0V diagnostic equipment.
In your.0ctober 4,1993, response to Supplement 5 for the Joseph M. Farley i
Nuclear Station, Units 1 and 2, you stated that the ITI-MOVATS Incorporated Thrust Measuring Device for M0V diagnostic testing was used.
In addition, J
your response stated that 85 percent. of the MOVs were evaluated in accordance with ITI-M0 VATS Engineering Report 5.2 and that the remaining MOVs are large Limitorque SB actuators that were evaluated using actual open/close test data 9402040104 940128 PDR ADOCK 05000348-
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January 28, 1994 from the Joseph M. Farley Nuclear Plant, Units 1 and 2.
Your response also stated that 70 MOVs have been setup using the ITI-MOVATS Incorporated Torque Thrust Cell (TTC) and that they have been reviewed for potential changes in actuator thrust output resulting from installation of the TTC.
It is the NRC staff's intention to discuss your resolution of the MOV diagnostic equipment accuracy issue and the results of your MOV evaluations during a future inspection.
This completes our efforts on TAC Nos. M87946 and M87947.
If you have any questions regarding this issue, please call me at (301) 504-1463.
Sincerely, Original Signed by:
Byron L. Siegel, Senior Project Manager Project Directorate 11-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc:
A. Hansen, PD3-3 T. Scarbrough, EMEB DISTRIBUTION:
Dock.et File NRC & Local PDRs PDII-l Reading File S. Varga G. Lainas S. Bajwa P. Anderson B. Siegel OGC ACRS (10)
E. Merschoff, Region II 0FC LA(PDIlbORPE PM:PD21:DRf6 D:PD21:DRPE NAME PAMAkshf5 BSiegel[Ni SBajwa Uk
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/94 0FFICIAL RECORD COPY
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DOCUMENT NAME:
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.. from the Joseph M. Farley Nuclear Plant, Units 1 and 2.
Your response also stated that 70 MOVs have been setup using the ITI-MOVATS Incorporated Torque Thrust Cell (TTC) and that they have been reviewed for potential changes in actuator thrust output resulting from installation of the TTC.
It is the NRC i
staff's intention to discuss your resolution of the MOV diagnostic equipment accuracy issue and the results of your MOV evaluations during a future inspection. This completes our efforts on TAC Nos. M87946 and M87947.
If you have any questions regarding this issue, please call me at (301) 504-1463.
Sincerely, F
/W L f
B ron L. Siegel, Senior Project Manager Project Directorate II-l Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc:
A. Hansen, PD3-3 T. Scarbrough, EMEB 1
i l
i s
e Mr. D. N. Morey Joseph M. Farley Nuclear Plant Southern Nuclear Operating Company, Inc.
cc:
Mr. R. D.-Hill, Jr.
State Health Officer General Manager - Farley Nuclear Plant Alabama Department of Public Health Southern Nuclear Operating Co., Inc.
434 Monroe Street Post Office Box 470 Montgomery, Alabama 36130-1701 Ashford, Alabama 36312 Chairman Mr. B. L. Moore, Licensing Manager Houston County Commission Southern Nuclear Operating Co., Inc.
Post Office Box 6406 Post Office Box 1295 Dothan, Alabama 36302 Birmingham, Alabama 35201-1295 Regional Administrator, Region II James H. Miller, III, Esquire U. S. Nuclear Regulatory Commission Balch and Bingham Law Firm 101 Marietta St., N.W., Ste. 2900 Post Office Box 306 Atlanta, Georgia 30323 1710 Sixth Avenue North Birmingham, Alabama 35201 Resident Inspector U.S. Nuclear Regulatory Commission Mr. J. D. Woodard Post Office Box 24 - Route 2 Executive Vice President Columbia, Alabama 36319 Southern Nuclear Operating Company P.O. Box 1295 Birmingham, Alabama 35201 L.