ML17229A267
| ML17229A267 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 03/11/1997 |
| From: | Stall J FLORIDA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-96-05, GL-96-5, L-97-61, NUDOCS 9703210294 | |
| Download: ML17229A267 (6) | |
Text
CATEGORY j.
REGULATOR NFORMATION DISTRIBUTION EM (RIDS)
P ACCESSION NBR:9703210294 DOC.DATE: 97/03/ll NOTA)IZED: YES DOCKET FAGIL:50-335 St. Lucie Plant, Unit 1, Florida Power 6 Light Co.
05000335 50-389 St. Lucie Plant, Unit 2, Florida Power 6 Light Co.
05000389 AUTH.NAME AUTHOR AFFILIATION STALL,J.A.
Florida Power
& Light Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk) 0
SUBJECT:
Forwards supplemental response to GL 96-05, "Periodic Verification of Design-Basis Capability of Safety-Related llotor-Operated Valves."
DISTRIBUTION CODE:
A073D COPIES RECEIVED:LTR ENCL SIZE:
TITLE: GL-96-05 Periodic Verif. of Design Basis Capability of Safety-Related NOTES:
RECIPIENT ID CODE/NAME PD2-'3 PD INTERNAL:
CENTER 01 NRR/DRPM ECB RES/DET/EIB/B RES/DST/PRAB EXTERNAL: NOAC COPIES LTTR ENCL 1
1 1
1 1
1 1
1 1
1 1
1 1
1 RECIPIENT ID CODE/NAME WIENS,L.
AEOD/SOD/RAB NRR/DE/EMEB NRR/HANSENgA RES/DST NRC PDR COPIES LTTR ENCL 1
1 1
1 1
1 1
1 1
1 1
1 NOTE TO ALL "RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE!
CONTACT THE DOCUMENT CONTROL DESK, ROOM OWFN 5D-5(EXT. 415-2083)
TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 13 ENCL 13
Florida Power &Light Company, 6501 South Ocean Drive, Jensen Beach, FL34957 FPL March 11, 1997 L-97-61 10 CFR 50.4 10 CFR 50. 54 (f)
U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 RE:
St. Lucie Units 1 and 2 Docket Nos. 50-335 and 389 180-Day Summary Description The Florida Power and Light Company (FPL) supplemental response to Generic Letter (GL) 96-05, "Periodic Verification ofDesign-Basis Capability ofSafety-Related Motor-Operated Valves,"
for St. Lucie Units 1 and 2 is attached.
By letter, L-96-281 dated October 28, 1996, FPL committed to submit, by March 17, 1997, a written summary description of the motor-operated valve ( MOV) periodic verification program established in accordance with the requested action paragraph of the GL.
This letter contains a regulatory commitment to maintain a periodic verification program to ensure safety related MOVs continue to be capable ofperforming their safety functions within the current licensing basis.
The basis for the program activities and frequencies and the justification for any changes willbe maintained at the St. Lucie Plant.
Please contact us ifthere are any questions about this submittal.
This response is provided pursuant to the requirements of Section 182a of the Atomic Energy Act of 1954, as amended, and 10 CFR 50.54(f).
Very truly yours, J. A. Stall Vice President St. Lucie Plant JAS/GRM Attachment cc:
Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant-97032i0294 9703ilF, PDR
~ADQCK 05000335(
P'DRQ an FPL Group company IlllllilllllllllllllllllllllIll llllllllillll
St. Lucie Units 1 and 2 Docket Nos. 50-335 and 389 L-97-61 Page 2 STATE OF FLORIDA
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COUNTY OF ST. LUCIE
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Ss.
J. A. Stall being first duly sworn, deposes and says:
That he is Vice President, St. Lucie Plant, for the Nuclear Division of Florida Power &Light Company, the Licensee herein; That he has executed the foregoing document, that the statements made in this document are true and correct to the best of his knowledge, information and belief, and that he is authorized to execute the document on behalf of said Licensee.
J. A. Stall STATE OF FLORIDA COUNTY OF >T. L~~
Sworn to and subscribed before me this I f day of iRAncA, 19+
by J. A. Stall, who is personally known to me.
Name of Notary Public - State of Florida
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(Print, type or stamp Commissioned Name of Notary Public)
St. Lucie Units 1 and 2 Docket Nos. 50-335 and 389 L-97-61 Attachment Page 1
St. Lucie Units 1 and 2 Periodic Verification of Motor-Operated Valve (MOV) Design Basis Capability Program Summary Description In accordance with NRC Generic Letter (GL) 96-05, Periodic Verification of Design-Basis Capability ofSafety-Related Motor-Operated Valves, St. Lucie has reviewed the effectiveness of the MOVperiodic verification program.
This program verifies on a periodic basis that safety-related MOVs continue to be capable of performing their safety functions within the current licensingbasis.
Theprogramwasestablishedaspartof the St. Lucie response to GL89-10. The review was performed to ensure that degradation can be properly identified and accounted for within the periodic verification program.
As a result of this review, St. Lucie has enhanced the
- program, incorporating the guidance and information provided in GL 96-05 and industry experience.
The resulting program blends a strong preventive maintenance program, and a mixture of static and dynamic (in-situ) diagnostic testing, to ensure that potential age-related degradations are identified.
Consideration of the safety significance, available margin, and environmental effects were included in the evaluation of the existing periodic verification activity.
Industry experience and initiatives, such as the Joint Owners Group (JOG) effort on periodic verification, willbe monitored to ensure that the St. Lucie MOVprogram incorporates industry experience and lessons learned.
One hundred fifty-one MOVs, the entire scope of MOVs in the GL 89-10 Program, are included in the periodic verification program for GL 96-05.
The focus of the periodic verification activities is on the risk significant and low margin valves.
The MOVs within the scope of GL 89-10 were classified into high, medium, and low risk significance categories.
The prioritization of the MOVs was completed using both probabilistic risk assessment and deterministic insights.
As allowed by GL 89-10 Supplement 6, the MOVs were grouped where practical to reduce the scope of dynamic testing.
From this grouping, prototype valves were selected for initial and periodic verification testing.
For all the valves which were not practical to dynamically test, the Electric Power Research Institute (EPRI)
Performance Predication Methodology (PPM) was utilized to predict valve performance.
The non testable valves evaluated using the EPRI methodology are considered to be high margin valves.
Potential degradations which may result in an increase in thrust or torque requirements or a decrease in motor actuator capability will be continually monitored to ensure the valves are capable of performing their safety functions within the current licensing basis.
This will be accomplished by the St. Lucie preventive maintenance (PM) program using a combination of static and dynamic testing with trending of the data and feedback to both the PM and testing programs.
Overall, it is desirable to perform dynamic testing on a periodic basis to collect data applicable to the overall MOV Program.
The entire population of prototype valves initially selected for testing have been dynamically tested. For verification testing, a sample population of high and medium risk significant low margin valves willbe dynamically tested once every three cycles to maximize the safety benefit of the testing.
The tested valves will be wedge gate and butterfly type
St. Lucie Units 1 and 2 Docket Nos. 50-335 and 389 L-97-61 Attachment Page 2 valves.
Low safety significant valves may continue to be included in the population provided there is a clear benefit to safety or a contribution to the overall MOV Program.
The periodic verification activities will include:
1.
2.
3.
4.
5.
6.
7.
Stem lubrication once every refueling cycle for all MOVs.
Static verification testing for all MOVs once every three refueling cycles.
Actuator inspection and refurbishment (ifrequired) every 2 refueling cycles for MOVs in non-severe environments, Actuator inspection and refurbishment (if required) every refueling cycle for MOVs in severe environments.
Dynamic testing once every three refueling cycles for a sample population of high and medium risk significant MOVs with low margin.
Trending of trouble and breakdown, actuator inspection results and specific static and dynamic test data.
Additional dynamic testing, static testing, or other testing as deemed necessary and useful by the MOV Coordinator.
The periodic verification program is a continuing and evolving program.
The maintenance and testing periods are expected to change, Changes to the program will be justified based on operating experience, trending, and testing results.
In addition, changes to test methods or industry experience may dictate changes to the periodic verification program.
The scope of the periodic verication program includes all of the valves within the GL 89-10 program.
The program addresses all the elements of GL 96-05 and provides for a blend of maintenance, static and dynamic testing, and trending of specific parameters to assure overall MOVcapability. The program is focused, utilizing risk significance and margin to determine the appropriate verification activities and frequency.
St. Lucie will continue to monitor and support industry initiatives, such as the JOG Periodic Verification Program, to incorporate industry experience and lessons learned into the program. The specific activities and frequencies which form the current periodic verification program are not commitments.
The St. Lucie Plant commitment is to maintain a periodic verification program to ensure safety-related MOVs continue to be capable ofperforming their safety functions within the current licensing basis.
The basis for the program activities and frequencies and the justification for any changes will be maintained by St. Lucie Plant.
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