ML20059L362
| ML20059L362 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 02/02/1994 |
| From: | Dromerick A Office of Nuclear Reactor Regulation |
| To: | J. J. Barton GENERAL PUBLIC UTILITIES CORP. |
| References | |
| GL-89-10, TAC-M87979, NUDOCS 9402040151 | |
| Download: ML20059L362 (4) | |
Text
M Uki7ED STATES (R le NUCL E AR REGULATORY COMMISSION (j.
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February 2, 1994 t
Docket No. 50-219 T
Mr. John J. Barton Vice President and Director GPU Nuclear Corporation Oyster Creek Nuclear Generating Station Post Office Box 388 Forked River, New Jersey 08731
Dear Mr. Barton:
SUBJECT:
GENERIC LETTER 89-10, SUPPLEMENT 5, " INACCURACY OF MOTOR-0PERATED VALVE DIAGNOSTIC EQUIPMENT" (TAC NO. M87979)
On June 28, 1993, the NRC staff issued Supplement 5, " Inaccuracy of Motor-Operated Valve Diagnostic Equipment," in Generic Letter (GL) 89-10, " Safety-Related Motor-Operated Valve Testing and Surveillance," requesting nuclear power plant licensees and construction permit holders (1) to 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 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, 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, licensees and permit holders have been actively addressing the uncertainties-regarding the accuracy of MOV 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, licensees and permit holders indicated that many MOVs 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 MOV diagnostic-equipment.
GPU Nuclear (GPUN) responded to Supplement 5 by letter dated September 27, 1993, and stated that it uses MOV diagnostic equipment manufactured by ITI-MOVATS, Liberty Technologies, and Teledyne Engineering.
GPUN stated that it evaluated the MOVs setup using the ITI-MOVATS TMD in accordance with ITI-MOVATS Engineering Report 5.2 and retested those MOVs that did not pass the acceptance criteria.
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Mr. John J.L Barton GPUN stated that in February 1993 it had evaluated the MOVs setup using Liberty Technologies' VOTES equipment and had retested MOVs.
GPUN stated that it had evaluated the actuator positioning effect of the ITI-MOVATS TTC.
GPUN-stated that the uncertainty would also apply to its use of the Teledyne Quick Stem Sensor (QSS) when calibrated with the Torque Thrust Cell (TTC)..GPUN stated that the ITI-MOVATS Special Test Report 6.0, " Actuator Repositioning Effects Test Report," indicates that actuator repeatability and thrust / torque measurement error should be revised when using a temporarily installed TTC.
During a future inspection, the NRC staff will discuss GPUN's resolution of the MOV diagnostic equipment accuracy issue.
Particularly, the NRC staff will-discuss with GPUN (I) its basis for the operability of the MOVs setup using the TMD that did not pass the acceptance criteria and the MOVs setup using VOTES that were found to require retesting, and (2) GPUN's evaluation of MOVs V-20-26 and 27.
This completes all efforts on TAC M87979.
If you have any questions regarding this issue, please call me at (301) 504-3473.
Sincerely, Or iginal signed by Alexander W. Dromerick, Sr. Project Manager Project Directorate I-4 Division of Reactor Projects - I/II i
Office of Nuclear Reactor Regulation cc:
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GPUN stated that in February 1993 it had evaluated the MOVs setup using l
Liberty Technologies' VOTES equipment and had retested MOVs.
GPUN stated that i
it had evaluated the actuator positioning effect of the ITI-MOVATS TTC GPUN stated that the uncertainty would also apply to its use of the Teledyne Quick Stem Sensor (QSS)'when calibrated with the Torque Thrust Cell (TTC).
GPUN stated that the ITI-MOVATS Special Test Report 6.0, " Actuator. Repositioning l
Effects Test Report," indicates that actuator repeatability and thrust / torque measurement error should be revised when using a temporarily installed TTC.
During a future inspection, the NRC staff will discuss GPUN's resolution of the MOV diagnostic equipment accuracy issue.
Particularly, the NRC staff will discuss with GPUN (1) its basis for the operability of the MOVs setup using l
the TMD that did not pass the acceptance criteria and the MOVs setup using V0TES that were found to require retesting, and (2) GPUN's evaluation of MOVs V-20-26 and 27.
This completes all efforts on TAC M87979.
If you have any questions regarding this issue, please call me at (301) 504-3473.
Sincerely, NW Alexa r-W. Dromerick, Sr. Project Manager Project Directorate I-4 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation cc:
See next page i
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b Mr. John J. Barton Oyster' Creek Nuclear Vice President and Director Generating Station CC:
Ernest L. Blake, Jr., Esquire Resident Inspector Shaw, Pittman, Potts & Trowbridge c/o U.S. Nuclear Regulatory Commission 2300 N Street, NW.
Post Office Box 445 Washington, DC 20037 Forked River, New Jersey 08731 Regional Administrator, Region I Kent Tosch, Chief U.S. Nuclear Regulatory Commission New Jersey Department of 475 Allendale Road Environmental Protection King of Prussia, Pennsylsania 19406 Bureau of Nuclear Engineering CN 415 BWR Licensing Manager Trenton, New Jersey 08625 GPU Nuclear Corporation 1 Upper Pond Road Parsippany, New Jersey 07054 Mayor Lacey Township
- 818 West Lacey Road Forked River, New Jersey 08731 Licensing Manager Oyster Creek Nuclear Generating Station Mail Stop:
Site Emergency Bldg.
Post Office Box 388 Forked River, New Jersey 08731 P
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