ND-19-1012, ITAAC Closure Notification on Completion of ITAAC C.2.6.12.03 (Index Number 673)

ITAAC Closure Notification on Completion of ITAAC C.2.6.12.03 (Index Number 673)

ML19240B527
Person / Time
Site:	Vogtle
Issue date:	08/28/2019
From:	Yox M Southern Nuclear Operating Co
To:	Document Control Desk, Office of New Reactors
References
ND-19-1012
Download: ML19240B527 (6)

Text

Southern Nuclear Michael J. Yox Regulatory Affairs Director 7825 River Road Waynesboro, GA 30830 Vogtle 3 & 4 706-848-6459 tel AU6 2 8 2019 Docket Nos.: 52-026 ND-19-1012 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 ITAAC C.2.6.12.03[Index Number 6731 Ladies and Gentlemen:

In accordance with 10 CFR 52.99(c)(1), 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 C.2.6.12.03[Index Number 673] demonstrating the as-built offsite circuit for Vogtle Unit 4 can supply the required voltage at the interface with the onsite ac power system. 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 Tom Petrak at 706-848-1575.

Respectfully submitted, Michael J. Yox Regulatory Affairs Director Vogtle 3 & 4

Enclosure:

Vogtle Electric Generating Plant(VEGP) Unit 4 Completion of ITAAC C.2.6.12.03 [Index Number 673]

MJY/KM/sfr

U.S. Nuclear Regulatory Commission ND-19-1012 Page 2 of 3 To:

Southern Nuclear Operating Company/ Georgia Power Company Mr. Peter P. Sena III (w/o enclosures)

Mr. D. L. McKinney(w/o enclosures)

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

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

Mr. G. Chick Mr. M. J. Yox Mr. A. S. Parton Ms. K. A. Roberts Mr. T. G. Petrak Mr. C. T. Defnall Mr. C. E. Morrow Mr. J. L. Hughes Ms. K. M. Stacy Ms. A. C. Chamberlain Mr. J. C. Haswell Document Services RTYPE: VND.LI.L06 File AR.01.02.06 cc:

Nuclear Requlatorv Commission Mr. W.Jones(w/o enclosures)

Mr. F. D. Brown Mr. C. P. Patel Mr. G. J. Khouri Ms. S. E. Temple Mr. N. D. Karlovich Mr. A. Lerch Mr. C. J. Even Mr. B. J. Kemker Ms. N. C. Coovert Mr. C. Welch Mr. J. Gaslevic Mr. V. Hall Mr. G. Armstrong Ms. T. Lamb Mr. M. Webb Mr. T. Fredette Mr. C. Weber Oalethorpe Power Corporation Mr. R. B. Brinkman Mr. E. Rasmussen

U.S. Nuclear Regulatory Commission ND-19-1012 Page 3 of 3 Municipal Electric Authority of Georgia Mr. J. E. Fuller Mr. 8. M. Jackson Daiton Utilities Mr. T. Bundros Westinqhouse Electric Company. LLC Dr. L. Oriani(w/o enclosures)

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

Mr. M. M. Corletti Ms. L. G. Iller Mr. Z. 8. Harper Mr. J. L. Coward 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-19-1012 Enclosure Page 1 of 3 Southern Nuclear Operating Company ND-19-1012 Enclosure Vogtle Electric Generating Plant(VEGP)Unit 4 Completion of ITAAC C.2.6.12.03[index Number 673]

U.S. Nuclear Regulatory Commission ND-19-1012 Enclosure Page 2 of 3 ITAAC Statement Design Commitment:

3. During steady state operation, each offsite power source is capable of supplying required voltage to the interface with the onsite ac power system that will support operation of assumed loads during normal, abnormal and accident conditions.

Inspections. Tests. Analyses:

Analyses of the as-built offsite circuit will be performed to evaluate the capability of each offsite circuit to supply the voltage requirements at the interface with the onsite ac power system.

Acceptance Criteria:

A report exists and concludes that during steady state operation each as-built offsite circuit is capable of supplying the voltage at the interface with the onsite ac power system that will support operation of assumed loads during normal, abnormal and accident conditions.

ITAAC Determination Basis Analyses were performed to demonstrate that during steady state operation each as-built offsite circuit to Vogtle Unit 4 is capable of supplying the voltage at the interface with the onsite alternating current(ac) power system that will support operation of assumed loads during normal, abnormal and accident conditions.

The offsite power system of Plant Vogtle Units 1,2, 3 and 4 was modeled in proprietary power transmission system planning software using the 2019 version 1C series Transmission Planning base cases for 2023-2024 Summer Peak load conditions and Spring Valley load conditions for the offsite power system. The plant load assumptions modeled for Units 1 and 2 were based on historical information. The plant load assumptions modeled for Units 3 and 4 were based on conservative values, which are greater than the maximum calculated loads for normal operating conditions, and bound the abnormal and accident condition loads. Units 3 and 4 plant loads are defined in the report "Assumed Loads During Normal, Abnormal and Accident Conditions",

attached to Memorandum ND-17-1189(Reference 1).

Multiple scenarios were utilized in the analyses, including nuclear unit operating scenarios and transmission element contingencies in accordance with 10 CFR Appendix A to Part 50 General Design Criterion(GDC)17. The analyses also include scenarios of one unit in Loss of Coolant Accident(LOCA)conditions with the other three units off-line. Local area generation sources that could significantly impact the Plant Vogtle 230 kilovolt (kV) bus voltage were modeled off-line. Local area capacitor banks and shunt reactors were modeled off-line in the initial scenarios for conservatism. For any initial scenario that voltage transients resulted in levels beyond specified limits, the scenario was rerun with the capacitor banks or shunt reactors online. In each case the results were satisfactory.

The results of the analyses of each scenario modeled with the Summer Peak or Spring Valley load conditions were within the acceptable range of 95% to 105% per unit steady-state, as specified in the Updated Final Safety Analysis Report(UFSAR)Table 8.2-201.

U.S. Nuclear Regulatory Commission ND-19-1012 Enclosure Page 3 of 3 The analyses report C.2.6.12.03-PCD-Rev 0-2019,"Vogtle Unit 4 Steady-State FSAR Study Report for ITAAC 02.6.12.03(Index 673)"(Reference 2), concludes that during steady state operation each as-built offsite circuit for Vogtle Unit 4 is capable of supplying the voltage at the interface with the onsite ac power system that will support operation of assumed loads during normal, abnormal and accident conditions.

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 closure review document number is included in the ITAAC C.2.6.12.03 Completion Package (Reference 3)and available for NRC inspection.

ITAAC Completion Statement Based on the above information, SNC hereby notifies the NRC that ITAAC C.2.6.12.03 was performed for Vogtle Unit 4 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. Southern Nuclear Intercompany Correspondence, ND-17-1189,"Assumed Loads During Normal, Abnormal and Accident Conditions", 6/30/17

2. C.2.6.12.04-PCD-Rev 0-2019 "Vogtle Unit 4 Steady-State FSAR Study Report for ITAAC C2.6.12.03(Index 673)"

3. C.2.6.12.04-U4-CP RevO,"Vogtle Unit 4 IT/\AC C.2.6.12.03(673) Completion Package"