ND-17-1531, Resubmittal of ITAAC Closure Notification on Completion of ITAAC C.2.6.12.06 (Index Number 676)

Resubmittal of ITAAC Closure Notification on Completion of ITAAC C.2.6.12.06 (Index Number 676)

ML17262A542
Person / Time
Site:	Vogtle
Issue date:	09/13/2017
From:	Yox M Southern Nuclear Operating Co
To:	Document Control Desk, Office of New Reactors
References
ITAAC C 2.6.12.06, ND-17-1531
Download: ML17262A542 (6)

Text

Michael J. Yox 7825 River Road

^ Southern Nuclear Regulatory Affairs Director Vogtle 3 & 4 Waynesboro, GA 30830 706-848-6459 tel 410-474-8587 cell myox@southernco.com SEP 1 3 2017 Docket No.: 52-025 ND-17-1531 10CFR 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 Resubmittal of ITAAC Closure Notification on Comoletion of ITAAC C.2.6.12.06 [Index Number 6761 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 3 Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC) Item C.2.6.12.06 [Index Number 676] for verifying that the reactor coolant pumps continue to receive power from either the main generator or the grid for a minimum of 3 seconds following a turbine trip. 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.

Southern Nuclear Operating Company (SNC) previously submitted ITAAC Closure Notification on Completion of ITAAC C.2.6.12.06 [Index Number676], ND-17-0789 [ML17121A057], dated April 28, 2017. This resubmittal provides additional details requested by the NRC staff during public meetings and supersedes ND-17-0789 in its entirety.

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 David Woods at 706-848-6903.

Respectfully submitted.

Michael J. Yox Regulatory Affairs Director Vogtle 3&4

Enclosure:

Vogtle Electric Generating Plant (VEGP) Unit 3 Completion of ITAAC C.2.6.12.06 [Index Number 676]

MJY/LBP/amw

U.S. Nuclear Regulatory Commission ND-17-1531 Page 2 of 3 To:

Southern Nuclear Operating Company/ Georgia Power Company Mr. D. A. Bost (w/o enclosures)

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

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

Mr. D. L. McKlnney Mr. M. J. Yox Mr. D. L. Fulton Mr. J. D. Williams Mr. D. F. Woods Mr. F. H. Willis Ms. A. L. Pugh Mr. A. 8. Parton Mr. W. A. Sparkman Mr. C. E. Morrow Ms. K. M. Stacy Mr. J. P. Redd Ms. A. C. Chamberlain Mr. D. R. Culver Document Services RTYPE: VND.LI.L06 File AR.01.02.06 cc; Nuclear Reouiatorv Commission Mr. W. Jones (w/o enclosures)

Ms. J. M. Heisserer Mr. C. P. Patel Mr. M. E. Ernstes Mr. G. J. Khouri Mr. T. E. Chandler Ms. S. E. Temple Ms. P. Braxton Mr. T. C. Brimfield Mr. A. J. Lerch Mr. C. J. Even Ms. V. L. Ordaz Mr. B. J. Davis Mr. B. J. Kemker Oolethoroe Power Corporation Mr. K. T. Haynes Mr. R. B. Brinkman Municipal Electric Authority of Georgia Mr. J. E. Fuller Mr. S. M. Jackson

U.S. Nuclear Regulatory Commission ND-17-1531 Page 3 of 3 Dalton Utilities Mr. T. Bundros WECTEC Mr. 0. A. Castell Westinahouse Electric Company. LLC Mr. R. Easterling (w/o enclosures)

Mr. G. Koucheravy (w/o enclosures)

Mr. D. 0. Durham (w/o enclosures)

Ms. L. G. Iller Mr. J. Hopkins Mr. D. Hawkins Mr. 0. F. Landon Mr. M. L. Clyde Ms. 8. DiTommaso Other Mr. J. E. Hesler, Bechtel Power Corporation Ms. L. Matis, Tetra Tech NUS, Inc.

Dr. W. R. Jacobs, Jr., Ph.D., CDS Associates, inc.

Mr. 8. Roetger, Georgia Public Service Commission Ms. 8. W. Kernizan, Georgia Public Service Commission Mr. K. C. Greene, Troutman Sanders Mr. 8. Blanton, Baich Bingham

U.S. Nuclear Regulatory Commission ND-17-1531 Enclosure Page 1 of 3 Southern Nuclear Operating Company ND-17-1531 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 3 Completion of ITAAC C.2.6.12.06 [Index Number 676]

U.S. Nuclear Regulatory Commission ND-17-1531 Enclosure Page 2 of 3 ITAAC Statement Desian Commitment:

6. The reactor coolant pumps continue to receive power from either the main generator or the grid for a minimum of 3 seconds following a turbine trip.

Inspections. Tests. Analyses:

Analyses of the as-built offsite power system will be performed to confirm that power wiil be available to the reactor coolant pumps for a minimum of 3 seconds foliowing a turbine trip when the buses powering the reactor coolant pumps are aligned to either the unit auxiliary transformers (UATs) or the reserve auxiliary transformers (RATs).

Acceptance Criteria:

A report exists and conciudes that voitage at the high-side of the generator stepup transformer (GSU), and the RATs, does not drop more than 0.15 per unit (pu) from the pre-trip steady-state voltage for a minimum of 3 seconds following a turbine trip when the buses powering the reactor cooiant pumps are aligned to either the UATs or the RATs.

ITAAC Determination Basis Analyses of the as-built offsite power system were performed to confirm that power will be available to the reactor coolant pumps (RCPs) for a minimum of 3 seconds following a turbine trip when the buses powering the reactor coolant pumps are aligned to either the unit auxiliary transformers (UATs) or the reserve auxiliary transformers (RATs).

The anaiyses utilized proprietary powertransmission system planning software which simulated worst case load data for Plant Vogtle (Units 1, 2, 3, 4) and nearby substations for 30 seconds foilowing a turbine trip, as documented in the turbine trip study (Reference 1). The anaiyses accounted for, but were not limited to, the negative value of mechanical power from windage and friction losses of the generator acting as a motor, as presented in the Westinghouse proprietary "AP1000 Turbine Generator Data" report, (Reference 2). The results of the simulation conciude that voltage at the high-side of the generator step-up transformer (GSU-powered by the main generator), and the RATs (powered by the grid), does not drop more than 0.15 per unit (pu) from the Unit 3 pre-trip steady-state voltage for a minimum of 3 seconds foilowing a Unit 3 turbine trip when the buses powering the reactor coolant pumps are aligned to either the UATs or the RATs.

The results of the turbine trip study show that the maximum voitage drop, over the 30 second simulation, at the high-side of the GSU and the RATs, is 0.0178 pu and 0.0182 pu, respectively.

Therefore, this report concludes that the voltage at the high-side of the GSU and the RATs does not drop more than 0.15 per unit (pu) from the pre-trip steady-state voltage for a minimum of 3 seconds foiiowing a turbine trip, when the buses powering the RCPs are aligned to either the UATs or the RATs, which meets the ITAAC acceptance criteria.

U.S. Nuclear Regulatory Commission ND-17-1531 Enclosure Page 3 of 3 ITAAC Finding Review In accordance with plant procedures for ITAAC completion, Southern Nuclear Operating Company (SNC) performed a review of all ITAAC findings pertaining to the subject ITAAC and associated corrective actions. This review determined that there are no relevant ITAAC findings associated with this ITAAC. The ITAAC finding completion review document number is included in the Vogtle Unit 3 ITAAC Completion Package for ITAAC C.2.6.12.06 (Reference 3) and available for NRC inspection.

ITAAC Completion Statement Based on the above information, SNC hereby notifies the NRC that ITAAC C.2.6.12.06 was performed for Vogtle 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.

References (available for NRC inspection)

1. C.2.6.12.06-PCD-Rev 0, "Vogtle 3 &4 Turbine Trip Study (Updated) 4/21/2017"

2. APP-MG01-Z0D-001-Rev 0, "API 000 Turbine Generator Data"

3. C.2.6.12.06-U3-CP Rev 1, "Vogtle Unit 3 ITAAC C.2.6.12.06 (676) Completion Package",

8/16/2017