ND-22-0272, ITAAC Closure Notification on Completion of ITAAC Item 2.6.04.02c (Index Number 624)

ITAAC Closure Notification on Completion of ITAAC Item 2.6.04.02c (Index Number 624)

ML22109A227
Person / Time
Site:	Vogtle
Issue date:	04/19/2022
From:	Coleman J Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ITAAC 2.6.04.02c, ND-22-0272
Download: ML22109A227 (6)

Text

A Southern Nuclear Dock,et No.:

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52-025 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4 Southern Nuclear Operating Company Vogtle Electric Generating Plant Unit 3 7825 River Road Waynesboro, GA 30830 706-848-6926 tel ND-22-0272 10 CFR 52.99(c)(1)

ITAAC Closure Notification on Completion of ITAAC Item 2.6.04.02c [Index Number 6241 Ladiels and Gentlemen:

In acwrdance 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 2.6.04.02c [Index Number 6241. This ITAAC confirms that the load sequencer associated with each standby diesel generator initiates a closure signal within +/-5 seconds of the set intervals to connect the loads. The closure process for this ITAAC is based on guidance in Nuclear Energy Institute (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) request NRC staff confirmation of this determination and publication of the required notice in the Fede~al Register per 1 O CFR 52.99.

I If there are any questions, please contact Kelli A. Roberts at 706-848-6991.

Respectfully submitted,

~~

Jamie M. Coleman Regulatory Affairs Director Vogtle 3 & 4

Enclosure:

JMC/DCH/sfr Vogtle Electric Generating Plant (VEGP) Unit 3 Completion of ITAAC 2.6.04.02c [Index Number 6241

U.S. Nuclear Regulatory Commission ND-22-0272 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. 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 Mr. T. Fanelli Ms. K. Mccurry Mr. J. Parent Mr. B. Griman Mr. V. Hall

U.S. Nuclear Regulatory Commission ND-22-0272 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 ND-22-0272 Page 1 of 3 Southern Nuclear Operating Company ND-22-0272 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 3 Completion of ITAAC 2.6.04.02c [Index Number 624]

U.S. Nuclear Regulatory Commission ND-22-0272 Page 2 of 3 IT AAC Statement Design Commitment 2.c) Automatic-sequence loads are sequentially loaded on the associated buses.

Inspections, Tests, Analyses An actual or simulated signal is initiated to start the load sequencer operation. Output signals will be monitored to determine the operability of the load sequencer. Time measurements are taken to determine the load stepping intervals.

Acceptance Criteria The load sequencer initiates a closure signal within +/-5 seconds of the set intervals to connect the loads.

ITAAC Determination Basis Pre-operational testing of the onsite standby power system (ZOS) was performed to demonstrate the automatic-sequence loads were sequentially loaded on the associated buses of each standby diesel generator within the specified time intervals. The operation of the load sequencer for each generator was tested in accordance with test procedure listed in Reference 1.

The A and B train load sequencers were tested independently. The Data Display and Processing System (DDS) was utilized to monitor and record the inputs and outputs of the load sequencer to determine operability during the test. A test signal which simulated a loss of voltage on the associated 6900V bus was initiated to start the operation of the load sequencer. The start time of the sequencer and the time of the closure signals of each load step was recorded by the DDS. The DDS event log was evaluated to determine the load stepping intervals for each group of loads, and to verify each automatic-sequence load received the closure signal. The test results are included in Reference 1 and confirm that the load sequencer initiated a closure signal within +/-5 seconds of the set intervals to connect the loads.

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 (SNC) performed a review of findings pertaining to the subject ITAAC and associated corrective actions. This review found there are no relevant ITAAC findings associated with this ITAAC. The review is documented in the ITAAC 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 2.6.04.02c was performed for VEGP Unit 3 and that the prescribed acceptance criteria are 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-22-0272 Page 3 of 3 References {available for NRC inspection)

1. SV3-ZOS-ITR-800624, Rev 0, "Unit 3 Results of Onsite Standby Power System (ZOS) Sequencer Testing: ITAAC 2.6.04.02c, NRC Index Number: 624"

2. 2.6.04.02c-U3-CP-Rev0, "ITAAC Completion Package"