Text

Submittal of Turbine Maintenance and Inspection Program in Accordance with Updated Final Safety Analysis Report
	ML20192A048
Person / Time
Site:	Vogtle
Issue date:	07/10/2020
From:	Yox M; Southern Nuclear Operating Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	ND-20-0561
	Download: ML20192A048 (11)
	v • d • e

^ ,1 l. I I Michael J. Yox 7825 River Road

^OLlLn0rn lNLICl0dr Regulatory Affairs Director Waynesboro, GA 30830 Vogtle 3 & 4 706-848-6459 tel July 10, 2020 Docket No.: 52-025 52-026 ND-20-0561 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant - Units 3&4 Submittal of Turbine Maintenance and Inspection Program In Accordance with Updated Final Safety Analysis Report Ladies and Gentlemen:

This submission is made with regard to the Vogtle Electric Generating Plant(VEGP), Units 3&4 Combined License(COL) Number NPF-91 and NPF-92, as required by the VEGP 3&4 Updated Final Safety Analysis(UFSAR) Section 10.2.6, Combined License Information on Turbine Maintenance and Inspection. Per UFSAR Section 10.2.6, a turbine maintenance and inspection program will be submitted to the NRC staff for review prior to fuel load. The program will be consistent with the maintenance and inspection program plan activities and inspection intervals identified in UFSAR Subsection 10.2.3.6.

Southern Nuclear Operating Company(SNC) hereby submits the turbine maintenance and inspection program, provided in the enclosure, in accordance with UFSAR Section 10.2.6.

This letter contains no regulatory commitments.

Should you have questions regarding the enclosed information, please contact Kelli Roberts at (706) 848-6991.

Respectfully submitted.

Michael J. Vox Regulatory Affairs Director Vogtle 3 & 4

Enclosure:

Vogtle Electric Generating Plant(VEGP) Units 3&4 Turbine Maintenance and Inspection Program MJY/LBP/sfr

U.S. Nuclear Regulatory Commission ND-20-0561 Page 2 of 3 go; Southern Nuclear Operatina Company / Georgia Power Company Mr. S. E. Kuczynski (w/o enclosures)

Mr. P. P. Sena III (w/o enclosures)

Mr. M. D. Meier (w/o enclosures)

Mr. D. H. Jones (w/o enclosures)

Mr. G. Chick Mr. M. Page Mr. P. Martino Mr. D. L. McKinney (w/o enclosures)

Mr. T. W. Yelverton (w/o enclosures)

Mr. B. H. Whitley Ms. C. A. Gayheart Ms. M. Ronnlund Mr. D. L. Fulton Mr. M. J. Vox Mr. C. T. Defnall Mr. J. Tupik Ms. S. Agee Mr. M. Humphrey Ms. A. C. Chamberlain Mr. S. Leighty Mr. N. Kellenberger Mr. E. Riffle Ms. K. Roberts Mr. J. Haswell Mr. D. T. BIythe Mr. K. Warren Mr. A. S. Parton Document Services RTYPE: VND.LI.LOO File AR.01.02.06 Nuclear Reaulatorv Commission Mr. W. Jones (w/o enclosures)

Mr. M. King (w/o enclosures)

Ms. M. Bailey w/o enclosures)

Mr. C. Patel Mr. C. Santos Mr. B. Kemker Mr. J. Eargle Mr. G. Khouri Ms. S. Temple Mr. C. J. Even Mr. A. Lerch Mr. S. Walker Mr. N.D. Karlovich Ms. N. C. Coovert Mr. C. Welch Mr. J. Gaslevic

U.S. Nuclear Regulatory Commission ND-20-0561 Page 3 of 3 Nuclear Regulatory Commission (Continued)

Mr. V. Hall Ms. K. P. Carrlngton Mr. M. Webb Mr. P.J. Heher State of Georgia Mr. R. Dunn Oalethorpe Power Corporation Mr. M. W. Price Ms. A. Whaley Municipal Electric Authority of Georgia Mr. J. E. Fuller Mr. S. M. Jackson Dalton Utilities Mr. T. Bundros Westinahouse Electric Company. LLC Mr. L. Oriani (w/o enclosures)

Mr. T. Rubenstein (w/o enclosures)

Mr. M. Corletti Mr. D. Hawkins Mr. J. Coward Other Mr. S. W. Kline, Bechtel Power Corporation Ms. L. A. Matis, Tetra Tech NUS, Inc.

Dr. W. R. Jacobs, Jr., Ph.D., GDS Associates, Inc.

Mr. S. Roetger, Georgia Public Service Commission Ms. S. W. Kernizan, Georgia Public Service Commission Mr. K. C. Greene, Troutman Sanders Mr. S. Blanton, Balch Bingham

U.S. Nuclear Regulatory Commission ND-20-0561 Enclosure Page 1 of 8 Southern Nuclear Operating Company ND-20-0561 Enclosure Vogtle Electric Generating Plant(VEGP) Units 3&4 Turbine Maintenance and Inspection Program

U.S. Nuclear Regulatory Commission ND-20-0561 Enclosure Page 2 of 8 a

COL Information on Turbine Maintenance and inspection per UFSAR Section 10.2.6 Per SNC's UFSAR Section 10.2.6, a turbine maintenance and inspection program will be submitted to the NRG staff for review prior to fuel load, and the program will be consistent with the maintenance and inspection program plan activities and inspection intervals identified in Subsection 10.2.3.6 (Reference 1). UFSAR section 10.2.6 also requires plant-specific turbine rotor test data and calculated toughness curves that support the material property assumptions in the turbine rotor analysis to be available for review after fabrication of the turbine and prior to fuel load. Plant specific rotor test data, material composition data, material testing validation, product quality certificates, and construction Quality Assurance(OA) records from the manufacturer are available for review in the final OA data packages(References 2 through 9).

Maintenance and Inspection Program Plan Requirements per UFSAR Section 10.2.3.6 Disassembly of the turbine is conducted during plant shutdown. Inspection activities include disassembly of the turbine conducted during plant shutdown and inspection of parts normally inaccessible when the turbine is assembled for operation. These activities are performed via Preventive Maintenance(PM)tasks (Attachment A)that are tracked in the site's asset management software database, MAXIMO.

At least one main steam stop valve, control valve, reheat stop valve, and intercept valve are dismantled and inspected approximately every 3 years during scheduled refueling or maintenance'shutdowns. A staggered inspection ensures that turbine valves are inspected every outage and that each group of valves, stop, control, or intercept, meets the 3-year inspection requirement. Attachment B shows the PM tasks associated with these inspections.

Main stop valves, control valves, reheat stop and intercept valves may be tested from the main control room with the turbine online using the turbine control and protection system (TOPS). The TOPS can control full or partial stroke of the valves. The control system contains test functions and allows for valves to be tested online. The reheat stop valves and intercept valves can be tested separately. All valve positions can be observed by operators in the control room. During a valve test, the other valves cannot be tested. Only one valve can be tested at a time (Reference 10).

Extraction nonreturn valves are tested prior to each startup per the Main Steam System normal operating procedure, 3-MSS-SOP-001 (Reference 11). As part of this procedure the nonreturn valve closing operation is tested and verified using surveillance procedure 3-MSS-NTS-20-001, Extraction Steam Power Assist Non-Return Valves Testing (Reference 13).

Turbine valve testing is performed at six-month intervals. The semi-annual testing frequency is based on nuclear industry experience that turbine-related tests are the most common cause of plant trips at power. A PM task will stroke test the valves listed on Attachment0 on a six (6) month frequency. Stroke testing is performed using 3-MTS-NTS-20-001, Main Turbine System Valve Stroke Test (Reference 12).

Extraction nonreturn valves are tested locally by stroking the valve full open with air, then equalizing air pressure, allowing the spring closure mechanism to close the valve. Closure of each valve is verified by direct observation of the valve arm movement. 3-MSS-SOP-001, Main Steam System normal operating procedure contains guidance for placing extraction steam into service (Reference 11). As part of this procedure the nonreturn valve closing operation is tested

U.S. Nuclear Regulatory Commission ND-20-0561 Enclosure Page 3 of 8 and verified using surveillance procedure, 3-MSS-NTS-20-001, Extraction Steam Power Assist Non-Return Valves Testing (Reference 13).

During outages, non-destructive examinations for the turbine assembly provide assurance that rotor flaws that lead to brittle fracture of a rotor are detected. These activities are performed via PM tasks (Attachment A)that are tracked in the site's asset management software database, MAXIMO.

Completion Statement Unit 4 procedures and PMs will be duplicated from Unit 3 procedures and PMs prior to initial fuel load in accordance with COL section 2.0.(12)(f)4. Based on the above information, SNC hereby notifies the NRC that the Turbine Maintenance and Inspection Plan criteria, as outlined in UFSAR sections 10.2.3.6 and 10.2.6, are met.

U.S. Nuclear Regulatory Commission ND-20-0561 Enclosure Page 4 of 8 References favailable for NRG inspection^

1. Updated Safety Analysis Report(UFSAR)Sections 10.2.3.6 and 10.2.6

2. SV3-MG01-VQQ-001, Final QA Data Package for Low Pressure Turbine A (Unit 3)

3. SV3-i\/iG01-VQQ-005, Final QA Data Package for High Pressure Turbine (Unit 3)

4. SV3-MG01-VQQ-007, Final QA Data Package for Low Pressure Turbine B (Unit 3)

5. SV3-MG01-VQQ-014, Final QA Data Package for Low Pressure Turbine C (Unit 3)

6. SV4-MG01-VQQ-002, Final QA Data Package for Low Pressure Turbine A (Unit 4)

7. SV4-MG01-VQQ-004, Final QA Data Package for Low Pressure Turbine B (Unit 4)

8. SV4-MG01-VQQ-013, Final QA Data Package for High Pressure Turbine (Unit 4)

9. SV4-MG01-VQQ-016, Final QA Data Package for Low Pressure Turbine 0(Unit 4)

10. API000 Main Turbine Control and Diagnostics System-System Specification Document, APP-TQS-M3-001

11. Main Steam System, 3-MSS-SQP-001

12. Main Turbine System Valve Stroke Test, 3-MTS-NTS-20-001

13. Extraction Steam Power Assist Non-Return Valves Testing, 3-MSS-NTS-20-001

U.S. Nuclear Regulatory Commission ND-20-0561 Enclosure Page 5 of 8 Attachment A High Pressure(HP)and Low Pressure(LP)Turbine PMs Tasks PM No. Title Component Work Scope/Task Content 3MTSPM0010 (90M-NEIL*) MTS- 3-MTS-MG-01 WORK SCOPE: HP -Inspection HP Turbine HP TURBINE INSPECTION TASK CONTENT:'Turbine Inspection should include the following:

Inspect Journal Bearings.

Inspect Thrust Bearing if disassembled during HP Inspection.

Inspect Oil Seals.

Inspect Packing.

Inspect Steam Path (nozzles, wheels, blade rings, rotors, diaphragms)

NDE rotor surface, blade/bucket attachment areas, and shaft bore (if applicable).

NDE/NDT should include visual exam, dye/fluorescent penetrant, magnetic particle, and Ultrasonic array testing as applicable.

Inspect Casing for erosion.

Inspect Packing & glands Inspect for evidence of rubbing (misalignment)

Inspect Casing, coupling, and Coupling Bolting.

Perform alignment during reassembly."

3MTSPM0076 (126M-NEIL)MTS- 3-MTS-MG-02A WORK SCOPE: Inspection-LP Turbine(Mono block. Welded, and Advanced Disk Design)

LP TURBINE A INSPECTION TASK CONTENT: -"Turbine Inspection should include the following:

Inspect Journal Bearings.

Inspect Thrust Bearing (if it is part of the LP).

Inspect Oil Seals.

Inspect Packing and glands.

Inspect Steam Path (nozzles, wheels, blade rings, rotors, and diaphragms)

NDE rotor surface, blade/bucket attachment areas, disc (if applicable) and shaft bore (if applicable).

NDE/NDT should include visual exam, dye/fluorescent penetrant, magnetic particle, and Ultrasonic array testing as applicable.

Perform Turning Gear inspection (as applicable to the individual rotor)

Inspect Casing for erosion.

Replace (as required) any turbine relief diaphragms Inspect for evidence of rubbing (misalignment)

Inspect Casing, Coupling, and Coupling Bolting.

Inspect Exhaust Hood Spray Piping and Nozzles for degradation Perform alignment during reassembly."

3MTSPM0077 (126M-NEIL)MTS- 3-MTS-MG-02B Same as 3-MTS-MG-02A above LP TURBINE B INSPECTION 3MTSPM0078 (126M-NEIL)MTS- 3-MTS-MG-02C Same as 3-MTS-MG-02A above LP TURBINE C INSPECTION Nuclear Electric Insurance Limited

U.S. Nuclear Regulatory Commission ND-20t0561 Enclosure Page 6 of 8 Attachment B Main Steam Stop / Control / Reheat Stop / Intercept Valve PM Tasks PM No. Title Component Activity 3MTSPM0012 (90M-NEIL*) MIS- 3-MTS-V001A Disassembled Inspection of Main Stop valves for evidence of MAIN TURBINE STOP 1 VALVE INSPECTION leakage,steam cutting, cracks, excessive erosion, binding, etc.