ML17310A667
| ML17310A667 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/28/1993 |
| From: | Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 102-02660-WFC-R, 102-2660-WFC-R, GL-89-10, NUDOCS 9310040369 | |
| Download: ML17310A667 (14) | |
Text
ACCELEPP.'I'EDQCQIVf FNT, DIS'ZRIjgTION SYSTEM ACCESSION NBR:931 FACIL:STN-50-528 STN~50-529
~ STN-50-530 AUTH.NAME CONWAYrW F ~
RECIP.NAME 0040369 DOC.DATE: 93/09/28 NOTARIZED: YES
'OCKET N
Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTHOR AFFILIATION Arizona Public Service Co. (formerly Arizona Nuclear Power R
RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Responds to GL 89-10,Suppl 5, "Inaccuracy of Equipment."
DISTRIBUTION CODE:
A064D COPIES RECEIVED:LTR ENCL TITLE: Response to Generic Ltr 89-10, "Safety-Related NOTES:STANDARDIZED PLANT Standardized plant.
Standardized plant.
MOV Diagnostic SIZE:
MOV Testing 6 Surveill 05000528 i 05000529 05000530A RECIPIENT ID CODE/NAME PDV PD TRAN,L INTERNAL: ACRS AEOD/DSP/TPAB NRR/DRIL/RPEB NRR/PD111-3 RES/DSIR EXTERNAL: NRC PDR COPIES LTTR ENCL 1
1 1
1 1
1 1
~ 1 1
1 1
1 1
1 1
RECIPIENT ID CODE/NAME TRAMMELLrC TRANrT AEOD/DSP/ROAB NRR/DE/EMEB NRR/J3 OGCB E
E 01 RES/DSIR EIB/B NSIC COPIES LTTR ENCL 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 D
NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACT THE l)OCUMEN'I CON1'ROL Dl SV, ROOM Pl-37 (EXT. 504-2065) TO ELIMINATEYOUR NAME FROM DISTRIBI "I ION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 16 ENCL 16
WILLIAMF. CONWAY EXECUTIVEVICEPRESIDENT NUCLEAR Arizona Public Service Company P.O. BOX 53999
~
PHOENIX. ARIZONA85072<999 102-02660-WFC/RAB/SAB September 28, 1993 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1,2, and 3 Docket Nos. STN 50-528/529/530 Response to NRC Generic Letter 89-10, Supplement 5, Inaccuracy of Motor-Operated Valve Diagnostic Equipment File: 93-010-026 93-180-419 On June 28, 1993, the NRC issued Generic Letter (GL) 89-1 0, Supplement 5, "Inaccuracy of Motor-Operated Valve Diagnostic Equipment."
This generic letter informed licensees of a concern regarding new information on the accuracy of motor-operated valve (MOV) diagnostic equipment.
The generic letter requires licensees to notify the NRC of the diagnostic equipment used to confirm the proper size, or to establish settings, for MOVs within the scope of the GL 89-10 program and to report the actions taken or planned to be taken to address the information provided regarding equipment accuracy.
The requested information is provided in the enclosure to this letter.
Should you have any questions, please contact Richard A. Bernier at (602) 393-5882.
Sincerely, WFC/RAB/SAB/ry Enclosure cc:
B. H, Faulkenberry J. A. Sloan C. M. Trammell 9310040369 930928 PDR ADOCK 05000528 P
.PDR
r
ENCLOSURE RESPONSE TO GENERIC LETTER 89-10, SUPPLEMENT 5 INACCURACYOF MOTOR-OPERATED VALVEDIAGNOSTIC EQUIPMENT
II E
II
NRC Reporting Requirement:
Notify the NRC staff of the diagnostic equipment used to confirm the proper size, or to establish settings, for MOVs within the scope of GL 89-10.
Arizona Public Service Company (APS) Response:
The diagnostic test systems used at PVNGS are:
ITI MOVATS Series 3000/3386 Diagnostic Test System, and Liberty Technologies 100 System (VOTES)
NRC Reporting Requirement:
Report whether actions have been taken or are planned to be taken (including schedule and summary of actions taken or planned) to address the information on the accuracy of MOV diagnostic equipment.
APS Response:
APS has taken or is planning to take the following actions based on the inaccuracy concerns associated with MOV diagnostic equipment:
ITI MOVATS A review of diagnostic test results was conducted to identify those MOVs which have been tested using the ITI MOVATS thrust measuring device (TMD) methodology.
A total of 139 MOVs were identified. Of these 139,'25 were Rotork actuators, 39 were Limitorque type SMC-04 actuators and the remaining 75 were Limitorque type SMB actuators.
The Limitorque type'SMB actuator test results were evaluated in accordance with ITI MOVATS Engineering Report (ER) 5.2, "Limitorque Actuator Open vs. Close TMD Data Analysis Procedure."
It was determined that each of the MOVs met operability requirements.
Since the Rotork actuators have two spring packs, one for open and one for close, the open spring pack calibration could not be used to set the close torque switch.
The Rotork test results were reevaluated using the Rotork Test Certification reports.
The closing current values, and measured actuator torque values from Page 1 of 3
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~the test reports, were compared to the onsite testing results using a reasonable stem thread coefficient of friction and a conservative valve packing torque.
All of these actuators were found to meet operability requirements.
The Limitorque type SMC-04 actuators had not originally been considered in ITI MOVATS ER 5.2. A test program was performed at PVNGS, and the results were provided to ITI MOVATS for inclusion of an accuracy calculation in ER 5.2.
ITI MOVATS provided APS with a letter containing coefficients for evaluating the SMC-04 test data.
The SMC-04 test data was reviewed using these coefficients and the actuators were found to meet operability requirements.
Although the Rotork, SMB and SMC-04 actuators were determined to be operable despite the additional inaccuracy in the diagnostic equipment, it was determined that some of the actuators would be reset using direct stem measurement data since this method provides greater accuracy and results in a greater available margin of thrust.
The ITI MOVATS TMD methodology is now used only when direct stem measurement is not possible.
MOV administrative procedures have been revised to require that data obtained when using the TMD methodology are evaluated by Engineering using ER 5.2 following testing.
ITI MOVATS ER 5.0, "ITI MOVATSEquipment Accuracy Summary," addresses test device accuracy.
Torque switch repeatability was removed from this document in Revision 5 due to the inclusion of revis'ed torque switch repeatability information in Limitorque Maintenance Update 92-2. The Limitorque Maintenance Update has been evaluated and changes to the setpoint control documents have been identified.
The applicable setpoint control documents for the three PVNGS units will be revised to include the limitations associated with both testing Rotork actuators and using the TMD method for Limitorque actuators, and to incorporate the new torque switch repeatability information.
LIBERTYTECHNOLOGIES VOTES The data from MOV tests performed with VOTES equipment were reevaluated using adjusted setpoint bands developed from guidance provided by Liberty Technologies.
Eleven of these MOVs had data that fell outside of the adjusted bands.
Further evaluation was performed and the 11 MOVs were determined to be within the design limits of their respective setpoint calculations.
Page 2 of 3
~ TELEDYNE ENGINEERING SERVICES STRAIN GAGES Stem-mounted strain gages obtained from Teledyne Engineering have been used for MOV diagnostic testing to record stem thrust and torque values.
Teledyne issued two technical reports regarding the accuracy of these strain gages.
The affect of the accuracy information on testing data is under evaluation and is expected to be complete by February 15, 1994.
A preliminary review of the technical reports indicate that the inaccuracies have been bounded by the inaccuracy values presently used for static testing.
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t STATE OF ARIZONA
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COUNTY OF MARICOPA )
I, W. F. Conway, represent that I am Executive Vice President - Nuclear, that the foregoing document,has been'signed by me on behalf of Arizona Public Service Company with full authority to do'so, that I have read such document and know its contents, and that to the best of my knowledge and belief, the statements made therein are true and correct.
W. F. Conway Sworn To Before Me This 88 Day Of
, 1993.
Notary Public My Commission Expires MyCommission Expires Juns 12, 4997
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