ND-22-0331, ITAAC Closure Notification on Completion of ITAAC 2.6.01.04e (Index Number 588)
| ML22167A063 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 06/16/2022 |
| From: | Coleman J Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| ITAAC 2.6.01.04e, ND-22-0331 | |
| Download: ML22167A063 (12) | |
Text
>-,, Southern Nuclear JUN 1 6 2022 Docket No.:
52-025 Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4 7825 River Road Waynesboro, GA 30830 706-848-6926 tel ND-22-0331 10 CFR 52.99(c)(1)
U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant Unit 3 ITAAC Closure Notification on Completion of ITAAC 2.6.01.04e (Index Number 588)
Ladies and Gentlemen:
In accordance with 1 O CFR 52.99(c)(1), the purpose of this letter is to notify the Nuclear Regulatory Commission (NRC) of the completion of Vogtle Electric Generating Plant (VEGP) Unit 3 Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC) Item 2.6.01.04e (Index Number 588). This ITAAC verifies that: the Main AC Power System (ECS) provides the capability for distributing non-Class 1 E ac power from onsite standby power system (ZOS) to specified nonsafety-related loads; the ECS provides two loss-of-voltage signals to the ZOS, one for each diesel-backed 6900 Vac switchgear bus; the ECS provides a reverse-power trip of the generator circuit breaker which is blocked for at least 15 seconds following a turbine trip; controls exist in the main control room (MCR) to cause the specified circuit breakers to perform the listed functions; and displays of the specified parameters can be retrieved in the MCR. The closure process for this ITAAC was based on the guidance described in NEI 08-01, "Industry Guideline for the ITAAC Closure Process under 1 O CFR Part 52," which was endorsed by the NRC in Regulatory Guide 1.215.
This letter contains no new NRC regulatory commitments. Southern Nuclear Operating Company (SNC) requests NRC staff confirmation of this determination and publication of the required notice in the Federal Register per 1 O CFR 52.99.
If there are any questions, please contact Kelli Roberts at 706-848-6991.
Respectfully submitted, Ja£1J!jidfttlJ ~f 0ML Regulatory Affairs Director Vogtle 3 & 4
Enclosure:
JMC/JTK/sfr Vogtle Electric Generating Plant (VEGP) Unit 3 Completion of ITAAC 2.6.01.04e [Index Number 5881
U.S. Nuclear Regulatory Commission ND-22-0331 Page 2 of 3 To:
Southern Nuclear Operating Company/ Georgia Power Company Mr. Peter P. Sena Ill Mr. D. L. McKinney Mr. H. Nieh Mr. G. Chick Mr. S. Stimac Mr. P. Martino Mr. D. Pitts Mr. J.B. Williams Mr. A. S. Parton Ms. K. A. Roberts Ms. J.M. Coleman Mr. C. T. Defnall Mr. C. E. Morrow Mr. K. J. Drudy Mr. J. M. Fisher Mr. R. L. Beilke Mr. S. Leighty Ms. A. C. Chamberlain Mr. J. C. Haswell Document Services RTYPE: VND.LI.L06 File AR.01.02.06 Nuclear Regulatory Commission Ms. M. Bailey Mr. M. King Mr. G. Bowman Ms. A. Veil Mr. C. P. Patel Mr. G. J. Khouri Mr. C. J. Even Mr. B. J. Kemker Ms. N. C. Coovert Mr. C. Welch Mr. J. Gaslevic Mr. 0. Lopez-Santiago Mr. G. Armstrong Mr. M. Webb Mr. T. Fredette Mr. C. Santos Mr. B. Davis Mr. J. Vasquez Mr. J. Eargle Ms. K. Mccurry Mr. J. Parent Mr. B. Griman Mr. V. Hall
U.S. Nuclear Regulatory Commission ND-22-0331 Page 3 of 3 Oglethorpe Power Corporation Mr. R. B. Brinkman Mr. E. Rasmussen Municipal Electric Authority of Georgia Mr. J. E. Fuller Mr. S. M. Jackson Dalton Utilities Mr. T. Bundros Westinghouse Electric Company, LLC Dr. L. Oriani Mr. D. C. Durham Mr. M. M. Corletti Mr. Z. S. Harper Ms. S.L. Zwack Other Mr. S. W. Kline, Bechtel Power Corporation Ms. L. Matis, Tetra Tech NUS, Inc.
Dr. W. R. Jacobs, Jr., Ph.D., GOS Associates, Inc.
Mr. S. Roetger, Georgia Public Service Commission Mr. R. L. Trokey, Georgia Public Service Commission Mr. K. C. Greene, Troutman Sanders Mr. S. Blanton, Balch Bingham
U.S. Nuclear Regulatory Commission N D-22-0331 Enclosure Page 1 of 9 Southern Nuclear Operating Company ND-22-0331 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 3 Completion of ITAAC 2.6.01.04e [Index Number 588]
U.S. Nuclear Regulatory Commission ND-22-0331 Enclosure Page 2 of 9 ITAAC Statement Design Commitment 4.a) The ECS provides the capability for distributing non-Class 1 E ac power from onsite sources (ZOS) to nonsafety-related loads listed in Table 2.6.1-2.
4.e) The ECS provides two loss-of-voltage signals to the onsite standby power system (ZOS),
one for each diesel-backed 6900 Vac switchgear bus.
4.f) The ECS provides a reverse-power trip of the generator circuit breaker which is blocked for at least 15 seconds following a turbine trip.
- 5. Controls exist in the MCR to cause the circuit breakers identified in Table 2.6.1-3 to perform the listed functions.
- 6. Displays of the parameters identified in Table 2.6.1-3 can be retrieved in the MCR.
Inspections. Tests, Analyses Tests will be performed using a test signal to confirm that an electrical path exists for each selected load listed in Table 2.6.1-2 from an ECS-ES-1 or ECS-ES-2 bus. Each test may be a single test or a series of overlapping tests.
Tests on the as-built ECS system will be conducted by simulating a loss-of-voltage condition on each diesel-backed 6900 Vac switchgear bus.
Tests on the as-built ECS system will be conducted by simulating a turbine trip signal followed by a simulated reverse-power condition. The generator circuit breaker trip signal will be monitored.
Tests will be performed to verify that controls in the MCR can operate the circuit breakers identified in Table 2.6.1-3.
Inspection will be performed for retrievability of the displays identified in Table 2.6.1-3 in the MCR.
Acceptance Criteria A test signal exists at the terminals of each selected load.
A loss-of-voltage signal is generated when the loss-of-voltage condition is simulated.
The generator circuit breaker trip signal does not occur until at least 15 seconds after the simulated turbine trip.
Controls in the MCR cause the circuit breakers identified in Table 2.6.1-3 to operate.
Displays identified in Table 2.6.1-3 can be retrieved in the MCR.
U.S. Nuclear Regulatory Commission ND-22-0331 Enclosure Page 3 of 9 IT AAC Determination Basis Testing and inspection were performed to verify that the Main AC Power System (ECS) performs the following:
The ECS provides the capability for distributing non-Class 1 E ac power from onsite sources (ZOS) to nonsafety-related loads listed in Combined License (COL) Table 2.6.1-2 (Attachment A).
The ECS provides two loss-of-voltage signals to the onsite standby power system (ZOS),
one for each diesel-backed 6900 Vac switchgear bus.
The ECS provides a reverse-power trip of the generator circuit breaker which is blocked for at least 15 seconds following a turbine trip.
Controls exist in the MCR to cause the circuit breakers identified in COL Table 2.6.1-3 (Attachment B) to perform the listed functions.
Displays of the parameters identified in COL Table 2.6.1-3 (Attachment B) can be retrieved in the MCR.
A test signal exists at the terminals of each selected load.
Testing was performed as documented in Reference 1 to verify that electrical paths exist for each selected load listed in Combined License (COL) Table 2.6.1-2 (Attachment A) from the ECS-ES-1 6900 Vac Switchgear Bus 1 or the ECS-ES-2 6900 Vac Switchgear Bus 2.
Reference 1 verified that power supply cables/wiring were installed and terminated from an ECS-ES-1 or ECS-ES-2 bus to the terminals for Day Tank Heater Pads A & B, Air-cooled Chiller 2 & 3 Piping Heat Trace, and Air-cooled Chiller 2 Control and Heat Trace (as identified in Attachment A) and documents continuity testing performed on each of the installed cables/wiring to verify that a test signal exists at the terminals. ECS-ES-1 and ECS-ES-2 were energized from the standby diesel generator by paralleling each diesel to its respective ES bus and loading the diesel to full load as documented in Reference 1. Work instructions listed in Reference 1 tested each remaining load listed in Attachment A and verified that each remaining load was de-energized, the power supply breaker(s) were then closed, and the load was verified to be energized. Pressurizer heaters (listed in Attachment A) were de-energized and during RCS pressure control testing, it was verified that the heaters were energized as documented in Reference 1. This constituted a series of overlapping tests to test all components. The combined test results confirmed that a test signal exists at the terminals of each selected load.
A loss-of-voltage signal is generated when the loss-of-voltage condition is simulated.
Testing was performed as documented in Reference 1 to verify that the ECS provides two loss-of-voltage signals to the onsite standby power system (ZOS), one for each diesel-backed 6900 Vac switchgear bus. The loss-of-voltage protection circuit for each switchgear bus and the diesel generator starting control circuitry were monitored. A loss-of-voltage condition was simulated at each diesel-backed 6900 Vac switchgear to initiate the loss-of voltage condition.
The loss-of-voltage condition was verified to initiate switchgear supply breakers opening, switchgear load breakers opening and the starting of the respective standby generator. The completed test results confirmed a loss-of-voltage signal is generated when the loss of voltage condition is simulated on each switchgear bus.
U.S. Nuclear Regulatory Commission ND-22-0331 Enclosure Page 4 of 9 The generator circuit breaker trip signal does not occur until at least 15 seconds after the simulated turbine trip.
Testing was performed as documented in Reference 1 with the turbine tripped. Test equipment was utilized to simulate a reverse power condition to the reverse power relay (RY1) and a timer was started. The timer was stopped when the reverse power relay output to the generator lockout relay (86SEQ1) was actuated, and the time was recorded. The generator circuit breaker trip circuit contacts were verified to close when the 86SEQ1 relay actuated. This testing was repeated for the RY2 and 86SEQ2 relays. The time delay for the Unit 3 RY1 relay was 19.99 sec and 20.09 sec for RY2. The test results confirmed that the generator circuit breaker trip signal does not occur until at least 15 seconds after the simulated turbine trip.
Controls in the MCR cause the circuit breakers identified in Table 2.6.1-3 to operate.
Testing was performed as documented in Reference 1 to verify controls in the MCR operate to cause the 6900 Vac Switchgear Bus 1 and 6900 Vac Switchgear Bus 2 circuit breakers listed in Combined License (COL) Table 2.6.1-3 (Attachment B) to operate. The control functions of each circuit breaker were tested and verified by inspection. The test results confirmed that controls in the MCR can operate the circuit breakers identified in Attachment B.
Displays identified in Table 2.6.1-3 can be retrieved in the MCR.
An inspection was performed as documented in Reference 1 for ECS and ZAS (Main Generator System) which visually confirmed that when each of the displays of parameters identified in Attachment B was summoned at an MCR workstation, the summoned plant parameter appeared on a display monitor at that MCR workstation.
Reference 1 is available for NRC inspection as part of Unit 3 ITAAC Completion Package (Reference 2).
ITAAC Finding Review In accordance with plant procedures for ITAAC completion, Southern Nuclear Operating Company performed a review of all lTAAC findings pertaining to the subject ITAAC and associated corrective actions. This review found there are no relevant findings associated with the ITAAC. The ITAAC completion review is documented in the ITAAC 2.6.01.04e Completion Package (Reference 2) and is available for NRC review.
IT AAC Completion Statement Based on the above information, SNC hereby notifies the NRC that ITAAC 2.6.01.04e was performed for VEGP Unit 3 and that the prescribed acceptance criteria were met.
Systems, structures, and components verified as part of this ITAAC are being maintained in their as-designed, ITAAC compliant condition in accordance with approved plant programs and procedures.
U.S. Nuclear Regulatory Commission ND-22-0331 Enclosure Page 5 of 9 References (available for NRC inspection)
- 1. SV3-ECS-ITR-800588, Rev 0, "Unit 3 ECS Non-1 E Distribution, Trip Signals, Controls and Displays"
- 2. 2.6.01.04e-U3-CP-Rev0, "ITAAC Completion Package"
U.S. Nuclear Regulatory Commission ND-22-0331 Enclosure Page 6 of 9 Attachment A COL Appendix C Table 2.6.1-2 Load Description Load Center Transformers EK-11, EK-12, EK-13, EK-14 ECS Panel Transformers Diesel Oil Transfer Module Enclosure A Electric Unit Heater Diesel Oil Transfer Module Enclosure A Fan Class 1 E Division A Regulating Transformer Class 1 E Division C Regulating Transformer Diesel Generator Fuel Oil Transfer Pump A Diesel Generator Room A Building Standby Exhaust Fans 1A and 2A Diesel Generator Service Module A Air Handling Unit (AHU) 01A Fan Diesel Generator Fuel Oil Cooler Fan A Diesel Fuel Oil Transfer Module Unit Heater A Diesel Generator Jacket Water Radiator Fans A Diesel Generator AC/OC Radiator Fan A Diesel Generator Building Engine AHU MS 03A Fan Fuel Oil Day Tank Vault Exhaust Fan A Diesel Generator Lube Oil Cooling Motors A (Front/Rear)
Diesel Generator Transformer A Day Tank Heater Pad A Startup Feedwater Pump A Service Water Pump A Service Water Cooling Tower Fan A MGR/Control Support Area (CSA) AHU A Supply and Return Fans Divisions A/C Class 1 E Electrical Room AHU A Supply and Return Fans Divisions 8/0 Class 1 E Electrical Room AHU D Supply and Return Fans Air-cooled Chiller Pump 2 Power Source ZOS-MG-02A ZOS MG 02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A
U.S. Nuclear Regulatory Commission ND-22-0331 Enclosure Page 7 of 9 Attachment A (Cont.)
COL Appendix C Table 2.6.1-2 Component Cooling Water Pump A Air-cooled Chiller 2 Air-cooled Chiller 2 Piping Heat Trace Air-cooled Chiller 2 Control and Heat Trace Chemical and Volume Control System (CVS) Makeup Pump A CVS Pump Room Unit Cooler Fan A Normal Residual Heat Removal System (RNS) Pump A RNS Pump Room Unit Cooler Fan A Equipment Room AHU Supply and Return Fans VXS-MA-01A/02A Switchgear Room A AHU Supply and Return Fans VXS-MA-05A/06A Non-1 E Battery Charger EDS 1-DC-1 Non-1 E Battery Room A Exhaust Fan Non-1 E Battery Charger EDS3-DC-1 Class 1 E Division A Battery Charger 1 (24-hour)
Class 1 E Division C Battery Charger 1 (24-hour)
Class 1 E Division C Battery Charger 2 (72-hour)
Divisions A/C Class 1 E Battery Room Exhaust Fan A Divisions B/D Class 1 E Battery Room Exhaust Fan D Supplemental Air Filtration Unit Fan A Backup Group 4A Pressurizer Heaters Spent Fuel Cooling Pump A Load Center Transformers EK-21, EK-22, EK-23, EK-24 ECS Panel Transformers Diesel Oil Transfer Module Enclosure B Electric Unit Heater Diesel Oil Transfer Module Enclosure B Fan Class 1 E Division B Regulating Transformer Class 1 E Division D Regulating Transformer Diesel Generator Fuel Oil Transfer Pump B Diesel Generator Room B Building Standby Exhaust Fans 1B and 2B ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02A ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B
U.S. Nuclear Regulatory Commission ND-22-0331 Enclosure Page 8 of 9 Attachment A (Cont.)
COL Appendix C Table 2.6.1-2 Diesel Generator Service Module B AHU 01 B Fan Diesel Generator Fuel Oil Cooler Fan B Diesel Fuel Oil Transfer Module Unit Heater B Diesel Generator Jacket Water Radiator Fans B Diesel Generator AC/OC Radiator Fan B Diesel Generator Building Engine AHU MS 038 Fan Fuel Oil Day Tank Vault Exhaust Fan B Diesel Generator Lube Oil Cooling Motors B (Front/Rear)
Diesel Generator Transformer B Day Tank Heater Pad B Startup Feedwater Pump B Service Water Pump B Service Water Cooling Tower Fan B MCR/CSA AHU B Supply and Return Fans Divisions 8/0 Class 1 E Electrical Room AHU B Supply and Return Fans Divisions A/C Class 1 E Electrical Room AHU C Supply and Return Fans Air-cooled Chiller Pump 3 Component Cooling Water Pump B Air-cooled Chiller 3 Air-cooled Chiller 3 Piping Heat Trace CVS Makeup Pump B CVS Pump Room Unit Cooler Fan B RNS Pump B RNS Pump Room Unit Cooler Fan B Equipment Room B AHU Supply and Return Fans VXS-MA-018/028 Switchgear Room B AHU Supply and Return Fans VXS-MA-058/068 Non-1 E Battery Charger EDS2-DC-1 Non-1 E Battery Charger EDS4-DC-1 Non-1 E Battery Room B Exhaust Fan ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028 ZOS-MG-028
U.S. Nuclear Regulatory Commission ND-22-0331 Enclosure Page 9 of 9 Attachment A (Cont.)
COL Appendix C Table 2.6.1-2 Class 1 E Division B Battery Charger 1 (24-hour)
Class 1 E Division B Battery Charger 2 (72-hour)
Class 1 E Division D Battery Charger 1 (24-hour)
Divisions B/D Class 1 E Battery Room Exhaust Fan B Divisions A/C Class 1 E Battery Room Exhaust Fan C Supplemental Air Filtration Unit Fan B Backup Group 4B Pressurizer Heaters Spent Fuel Cooling Pump B Attachment B COL Appendix C Table 2.6.1-3 Equipment Tag No.
Display 6900 V Switchgear Bus 1 ECS-ES-1 Yes (Bus voltage, breaker position for all breakers on bus) 6900 V Switchgear Bus 2 ECS-ES-2 Yes (Bus voltage, breaker position for all breakers on bus)
Unit Auxiliary ZAS-ET-2A Yes Transformer A (Secondary Voltage)
Unit Auxiliary ZAS-ET-2B Yes Transformer B (Secondary Voltage)
Reserve Auxiliary ZAS-ET-4A Yes Transformer A (Secondary Voltage)
Reserve Auxiliary ZAS-ET-4B Yes Transformer B (Secondary Voltage)
ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B ZOS-MG-02B Control Function Yes (Breaker open/close)
Yes (Breaker open/close)
No No No No