Letter Sequence Request |
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EPID:L-2023-LLA-0123, ITAAC Closure Verification Evaluation Form (Vef) for ITAAC Number 2.1.02.08e (Index No. 40) for Vogtle Unit 4 Combined License (VOG4) (Open) |
Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, ... further results|Request]]
- Acceptance
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ND-22-0657, ITAAC Closure Notification on Completion of ITAAC 2.3.14.04 (Index Number 480)2022-11-17017 November 2022
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ND-22-0898, ITAAC Closure Notification on Completion of 3.2.00.04 (Index Number 751)2022-11-18018 November 2022
ITAAC Closure Notification on Completion of 3.2.00.04 (Index Number 751)
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ND-22-0714, ITAAC Closure Notification on Completion of ITAAC 2.3.08.02.iii (Index Number 4171)2022-11-22022 November 2022
ITAAC Closure Notification on Completion of ITAAC 2.3.08.02.iii (Index Number 4171)
Project stage: Request
ND-22-0711, ITAAC Closure Notification on Completion of ITAAC 3.3.00.01 (Index Number 759)2022-11-23023 November 2022
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ML22332A5372022-11-28028 November 2022
Draft LAR 23-001 for 12-8-22 Public Meeting
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Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 2.2.03.12a.i (Index Number 214)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 2.3.05.03b.iii (Index Number 348)
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ITAAC Closure Notification on Completion of ITAAC 2.3.02.05.i (Index Number 291)
Project stage: Request
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Project stage: Request
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Resubmittal of Notice of Uncompleted ITAAC 225-days Prior to Initial Fuel Load Item 3.3.00.07d.ii.c (Index Number 802)
Project stage: Request
ND-22-0964, Resubmittal of Notice of Uncompleted ITAAC 225-days Prior to Initial Fuel Load Item 3.3.00.07d.ii.a (Index Number 800)2022-12-22022 December 2022
Resubmittal of Notice of Uncompleted ITAAC 225-days Prior to Initial Fuel Load Item 3.3.00.07d.ii.a (Index Number 800)
Project stage: Request
ND-22-0965, Resubmittal of Notice of Uncompleted IT Aac 225-days Prior to Initial Fuel Load Item 3.3.00.07d.ii.b (Index Number 801)2022-12-22022 December 2022
Resubmittal of Notice of Uncompleted IT Aac 225-days Prior to Initial Fuel Load Item 3.3.00.07d.ii.b (Index Number 801)
Project stage: Request
ND-22-0895, ITAAC Closure Notification on Completion of ITAAC 2.2.01.01 (Index Number 90)2022-12-28028 December 2022
ITAAC Closure Notification on Completion of ITAAC 2.2.01.01 (Index Number 90)
Project stage: Request
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Summary of December 8, 2022, Public Meeting with Southern Nuclear Operating Company
Project stage: Request
ND-23-1001, ITAAC Closure Notification on Completion of ITAAC 2.7.01.05.i (Index Number 684)2023-01-0505 January 2023
ITAAC Closure Notification on Completion of ITAAC 2.7.01.05.i (Index Number 684)
Project stage: Request
ND-22-0848, ITAAC Closure Notification on Completion of ITAAC 2.3.02.14 (Index Number 317)2023-01-10010 January 2023
ITAAC Closure Notification on Completion of ITAAC 2.3.02.14 (Index Number 317)
Project stage: Request
ND-22-0869, ITAAC Closure Notification on Completion of Item 2.3.13.05.i (Index Number 462)2023-01-12012 January 2023
ITAAC Closure Notification on Completion of Item 2.3.13.05.i (Index Number 462)
Project stage: Request
ND-23-0030, ITAAC Closure Notification on Completion of ITAAC 3.3.00.02a.i.d (Index Number 763)2023-01-13013 January 2023
ITAAC Closure Notification on Completion of ITAAC 3.3.00.02a.i.d (Index Number 763)
Project stage: Request
ND-23-0026, ITAAC Closure Notification on Completion of ITAAC 2.2.03.12a.iv (Index Number 216)2023-01-13013 January 2023
ITAAC Closure Notification on Completion of ITAAC 2.2.03.12a.iv (Index Number 216)
Project stage: Request
ND-23-0029, ITAAC Closure Notification on Completion of ITAAC 3.3.00.02a.i.c (Index Number 762)2023-01-13013 January 2023
ITAAC Closure Notification on Completion of ITAAC 3.3.00.02a.i.c (Index Number 762)
Project stage: Request
ND-22-0649, ITAAC Closure Notification on Completion of ITAAC 2.1.02.12a.iv (Index Number 56)2023-01-13013 January 2023
ITAAC Closure Notification on Completion of ITAAC 2.1.02.12a.iv (Index Number 56)
Project stage: Request
ND-22-0893, ITAAC Closure Notification on Completion of ITAAC 2.1.02.01 (Index Number 12)2023-01-16016 January 2023
ITAAC Closure Notification on Completion of ITAAC 2.1.02.01 (Index Number 12)
Project stage: Request
ND-22-0700, ITAAC Closure Notification on Completion of Item 2.2.04.12a.i (Index Number 248)2023-01-20020 January 2023
ITAAC Closure Notification on Completion of Item 2.2.04.12a.i (Index Number 248)
Project stage: Request
ND-22-0521, ITAAC Closure Notification on Completion of ITAAC 2.2.03.08c.i.03 (Index Number 179)2023-01-20020 January 2023
ITAAC Closure Notification on Completion of ITAAC 2.2.03.08c.i.03 (Index Number 179)
Project stage: Request
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ITAAC Closure Notification on Completion of 2.2.02.11a.i (Index Number 154)
Project stage: Request
ND-23-0041, ITAAC Closure Notification on Completion of ITAAC 2.2.04.01 (Index Number 219)2023-01-26026 January 2023
ITAAC Closure Notification on Completion of ITAAC 2.2.04.01 (Index Number 219)
Project stage: Request
ND-23-0078, ITAAC Closure Notification on Completion of ITAAC 2.2.02.06b (Index Number 133)2023-01-27027 January 2023
ITAAC Closure Notification on Completion of ITAAC 2.2.02.06b (Index Number 133)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 2.3.08.02.i (Index Number 415)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 3.3.00.02h 9Index Number 776)
Project stage: Request
ND-23-0079, ITAAC Closure Notification on Completion of ITAAC 2.3.02.02a (Index Number 285)2023-02-0202 February 2023
ITAAC Closure Notification on Completion of ITAAC 2.3.02.02a (Index Number 285)
Project stage: Request
ND-23-0039, ITAAC Closure Notification on Completion of ITAAC 2.2.03.08c.ii (Index Number 181)2023-02-0303 February 2023
ITAAC Closure Notification on Completion of ITAAC 2.2.03.08c.ii (Index Number 181)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 2.1.02.08d.i (Index Number 32)
Project stage: Request
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ITAAC Closure Notification on Completion of 2.4.06.02 (Index Number 504)
Project stage: Request
ND-22-0733, ITAAC Closure Notification on Completion of ITAAC 2.3.05.03c.ii (Index Number 350)2023-02-10010 February 2023
ITAAC Closure Notification on Completion of ITAAC 2.3.05.03c.ii (Index Number 350)
Project stage: Request
ND-23-0130, ITAAC Closure Notification on Completion of ITAAC 2.3.07.07c (Index Number 408)2023-02-10010 February 2023
ITAAC Closure Notification on Completion of ITAAC 2.3.07.07c (Index Number 408)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 2.3.05.03d.ii (Index Number 352)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC Item 2.3.10.12 (Index Number 879)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 2.3.09.02a (Index Number 421)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 2.3.04.05 (Index Number 332)
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ITAAC Closure Notification on Completion of Item 2.2.05.05a.i (Index Number 259)
Project stage: Request
ND-23-0118, ITAAC Closure Notification on Completion of ITAAC 2.3.07.05.i (Index Number 396)2023-02-17017 February 2023
ITAAC Closure Notification on Completion of ITAAC 2.3.07.05.i (Index Number 396)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 3.3.00.07d.i (Index Number 799)
Project stage: Request
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ITAAC Closure Notification on Completion of ITAAC 2.6.03.05d.i (Index Number 613)
Project stage: Request
2023-01-12
[Table View] |
Text
Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4 7825 River Road Waynesboro, GA 30830 706-848-6926 tel July 16, 2023 Docket No.:
52-026 ND-23-0573 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 4 ITAAC Closure Notification on Completion of 2.4.02.02a [Index Number 497]
Ladies and Gentlemen:
In accordance with 10 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 4 Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC) item 2.4.02.02a [Index Number 497]
which verifies the main turbine-generator trips after receiving a signal from the DAS, the main turbine-generator trips from an overspeed trip signal from the emergency and backup overspeed trip signals, and controls in the MCR operate to trip the main turbine-generator. The closure process for this ITAAC is based on the guidance described in NEI 08-01, Industry Guideline for the ITAAC Closure Process under 10 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 10 CFR 52.99.
If there are any questions, please contact Kelli Roberts at 706-848-6991.
Respectfully submitted, Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4
Enclosure:
Vogtle Electric Generating Plant (VEGP) Unit 4 Completion of 2.4.02.02a [Index Number 497]
JMC/TJC/sfr
U.S. Nuclear Regulatory Commission ND-23-0573 Page 2 of 2 cc:
Regional Administrator, Region ll Director, Office of Nuclear Reactor Regulation (NRR)
Director, Vogtle Project Office NRR Senior Resident Inspector - Vogtle 3 & 4
U.S. Nuclear Regulatory Commission ND-23-0573 Enclosure Page 1 of 4 Southern Nuclear Operating Company ND-23-0573 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 4 Completion of ITAAC 2.4.02.02a [Index Number 497]
U.S. Nuclear Regulatory Commission ND-23-0573 Enclosure Page 2 of 4 ITAAC Statement Design Commitment 2.a) Controls exist in the MCR to trip the main turbine-generator.
2.c) The main turbine-generator trips after receiving a signal from the DAS.
- 3) The trip signals from the two turbine electrical overspeed protection trip systems are isolated from, and independent of, each other.
Inspections/Tests/Analyses Testing will be performed on the main turbine-generator using controls in the MCR.
Testing will be performed using real or simulated signals into the DAS.
ii) Testing of the as-built system will be performed using simulated signals from the turbine speed sensors.
Acceptance Criteria Controls in the MCR operate to trip the main turbine-generator.
The main turbine-generator trips after receiving a signal from the DAS.
ii) The main turbine-generator trips after overspeed signals are received from the speed sensors of the 110% emergency electrical overspeed trip system, and the main turbine-generator trips after overspeed signals are received from the speed sensors of the 111% backup electrical overspeed trip system.
ITAAC Determination Basis This ITAAC requires testing to be performed to verify that controls exist in the Main Control Room (MCR) and operate to trip the main turbine-generator and that the main turbine-generator trips after receiving a real or simulated signal from the Diverse Actuation System (DAS). This ITAAC also verifies the turbine electrical overspeed protection trip systems are isolated and independent of each other and that the main turbine-generator trips after receiving simulated trip signals from the emergency electrical overspeed trip system and the backup electrical overspeed trip system.
Controls in the MCR operate to trip the main turbine-generator.
Testing was performed in accordance with Unit 4 preoperational test procedure listed in Reference 1 to verify that controls in the MCR operate to trip the main turbine-generator.
Testing was initiated by resetting the main turbine, verifying the turbine is not tripped, and verifying the main turbine stop and control valves are open. The turbine trip hand switch at the Primary Dedicated Safety Panel (PDSP) was placed in trip, the turbine mode turbine trip display was verified, and the turbine stop and control valves were verified to be closed.
U.S. Nuclear Regulatory Commission ND-23-0573 Enclosure Page 3 of 4 This testing confirmed that for Unit 4, controls in the MCR operate to trip the main turbine-generator.
The main turbine-generator trips after receiving a signal from the DAS.
Testing was performed in accordance with Unit 4 preoperational test procedures listed in Reference 1 to verify the main turbine-generator trips after receiving a signal from the DAS.
Testing in reference 1 performed a trip solenoid valve functional test by verifying that when master trip pilot solenoids (TOS-V174A1/A2, TOS-V174B1/B2) were de-energized, the spool moved to the tripped position and the main turbine and extraction non-return valves were verified to close locally thereby tripping the main turbine. Testing in reference 1 verified the master trip pilot solenoids de-energize due to a DAS manual Reactor and Turbine Trip switch operation resulting in a signal from DAS to the main turbine-generator trip.
Results of the preoperational testing for Unit 4 confirmed that the main turbine-generator trips after receiving a signal from the DAS.
ii) The main turbine-generator trips after overspeed signals are received from the speed sensors of the 110% emergency electrical overspeed trip system, and the main turbine-generator trips after overspeed signals are received from the speed sensors of the 111% backup electrical overspeed trip system.
Testing was performed in accordance with Unit 4 preoperational test procedure listed in Reference 1 to verify the main turbine-generator tripped after overspeed signals were received from the speed sensors of the 110% emergency electrical overspeed trip system, and the main turbine-generator tripped after overspeed signals were received from the speed sensors of the 111% backup electrical overspeed trip system.
Testing in reference 1 performed a trip solenoid valve functional test by verifying when master trip pilot solenoids (TOS-V174A1/A2, TOS-V174B1/B2) were de-energized, the spool moved to the tripped position and the main turbine and extraction non-return valves were verified to close locally thereby tripping the main turbine. The test then simulated an overspeed condition at the speed sensors for the 110% emergency electrical overspeed trip and verified the trip solenoids were tripped. The test then simulated an overspeed condition at the speed sensors for the 111% backup electrical overspeed trip and verified the trip solenoids were tripped.
Results of the preoperational testing for Unit 4 confirmed that the main turbine-generator trips after overspeed signals are received from the speed sensors for the 110% emergency electrical overspeed trip system, and the main turbine-generator trips after overspeed signals are received from the speed sensors for the 111% backup electrical overspeed trip system.
The completed test results (Reference 1), confirm that that DAS controls exist in the MCR and operate to trip the main turbine-generator, that the main turbine-generator trips after receiving a real or simulated signal from the DAS, and that the main turbine-generator trips after receiving trip signals from the emergency electrical overspeed trip system and the backup electrical overspeed trip system.
Reference 1 is available for NRC inspection as part of Unit 4 ITAAC Completion Package (Reference 2).
U.S. Nuclear Regulatory Commission ND-23-0573 Enclosure Page 4 of 4 ITAAC Finding Review In accordance with plant procedures for ITAAC completion, Southern Nuclear Operating Company (SNC) performed a review of all findings pertaining to the subject ITAAC and associated corrective actions. This review found there are no relevant ITAAC findings associated with this ITAAC. The ITAAC completion review is documented in the ITAAC Completion Package for 2.4.02.02a (Reference 2) and is available for NRC review.
ITAAC Completion Statement Based on the above information, SNC hereby notifies the NRC that ITAAC 2.4.02.02a was performed for VEGP Unit 4 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.
References (available for NRC inspection)
- 1. SV4-MTS-ITR-800497, Rev. 0, Unit 4 Main Turbine-Generator MCR, DAS, and Overspeed Trip: ITAAC 2.4.02.02a, NRC Index Number: 497
- 2. 2.4.02.02a.i-U4-CP-Rev0, ITAAC Completion Package
