ND-21-0054, Unit 4 - ITAAC Closure Notification on Completion of ITAAC 2.6.03.04b (Index Number 602)

Unit 4 - ITAAC Closure Notification on Completion of ITAAC 2.6.03.04b (Index Number 602)

ML21032A266
Person / Time
Site:	Vogtle
Issue date:	01/30/2021
From:	Yox M Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ND-21-0054
Download: ML21032A266 (6)

Text

C tU K.I I NlichaelJ. Vox 7825 River Road

^OULrl0rn INUClSdr Regulatory Affairs Director Waynesboro, GA 30830 Vogtle3&4 706-848-6459 tel JAN 3 0 202t Docket No.: 52-025 52-026 ND-21-0054 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 and Unit 4 ITAAC Closure Notification on Completion of ITAAC 2.6.03.04b (Index Number 6021 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 and Unit 4 Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC) Item 2.6.03.04b [Index Number 602]. This ITAAC confirms that the battery chargers, regulating transformers, and isolation fuses prevent credible faults from propagating into the Class 1E dc and Uninterruptible Power Supply System (IDS). 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 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. Vox Regulatory Affairs Director Vogtle 3 & 4

Enclosure:

Vogtle Electric Generating Plant(VEGP) Unit 3 and Unit 4 Completion of ITAAC 2.6.03.04b [Index Number 602]

MJY/JMW/sfr

U.S. Nuclear Regulatory Commission ND-21-0054 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. G. Chick Mr. S. Stimac Mr. P. Martino 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. R. L. Belike Mr. S. Leighty Ms. A. C. Chamberlain Mr. J. C. Haswell Document Services RTYPE: VND.LI.L06 File AR.01.02.06 cc:

Nuclear Regulatory Commission Ms. M. Bailey (w/o enclosures)

M M. King M H. K. Nieh M C. P. Patel M G. J. Khouri M C. J. Even M B. J. Kemker Ms. N. C. Coovert M C. Welch M J. Gaslevic M O. Lopez-Santiago M G. Armstrong M M. Webb M T. Fredette M C. Santos M B. Davis M J. Vasquez M J. Eargle M E. Davidson M T. Fanelli M S. Rose Ms. K. McCurry Qqlethorpe Power Corporation Mr. R. B. Brinkman Mr. E. Rasmussen

U.S. Nuclear Regulatory Commission ND-21-0054 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. OrlanI (w/o enclosures)

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

Mr. M. M. CorlettI Mr. Z. 8. Harper Mr. J. L. Coward Other Mr. 8. W. Kline, Bechtel Power Corporation Ms. L. Matis, Tetra Tech NUS, Inc.

Dr. W. R. Jacobs, Jr., Ph.D., GDS Associates, Inc.

Mr. 8. Roetger, Georgia Public Service Commission Mr. R. L. Trokey, Georgia Public Service Commission Mr. K. C. Greene, Troutman Sanders Mr. 8. Blanton, Balch BIngham

U.S. Nuclear Regulatory Commission ND-21-0054 Enclosure Page 1 of 3 Southern Nuclear Operating Company ND-21-0054 Enclosure Vogtle Electric Generating Riant(VEGP) Unit 3 and Unit 4 Completion of iTAAC 2.6.03.04b [index Number 602]

U.S. Nuclear Regulatory Commission ND-21-0054 Enclosure Page 2 of 3 ITAAC Statement Design Commitment 4.b) The IDS provides electrical isolation between itself and the non-Class 1E ac power system and the non-Class 1E lighting in the MCR.

Insoections/Tests/Analvses Type tests, analyses, or a combination of type tests and analyses of the isolation devices will be performed.

Acceptance Criteria A report exists and concludes that the battery chargers, regulating transformers, and isolation fuses prevent credible faults from propagating into the IDS.

ITAAC Determination Basis A combination of type testing and analyses of the isolation devices was performed to verify that the Class 1E do and Uninterruptible Power Supply System (IDS) provides electrical isolation between itself and the non-Class 1E ac power system and the non-Class 1E lighting in the Main Control Room (MCR). A report exists and concludes that the battery chargers, regulating transformers, and isolation fuses prevent credible faults from propagating into the IDS.

Type testing and analyses were performed on battery chargers, regulating transformers, and isolation fuses in accordance with the Institute of Electrical and Electronics Engineers (IEEE)

Standard 384(Reference 1). Short circuit and coordination analyses were performed in accordance with IEEE Standards 141 and 242(References 2 and 3, respectively) to determine maximum credible faults, time to clear the faults, and proper isolation.

The testing and supporting analyses demonstrated that the most severe credible faults applied to the non-Class 1E side of the isolation component did not degrade the intended safety function of IDS. Type tests were performed under conditions which the non-Class 1E side of the isolation component was exposed to the calculated maximum credible fault while the Class 1E side of the isolation component was monitored for perturbations.

Short circuit and coordination analyses are documented in the "Coordination Study - Class 1E 208Y/120V AC System"(Reference 4) and "Class 1E (IDS)250V DC System - Coordination Study"(Reference 5) and demonstrate adequate overcurrent protective device ratings and selective coordination. Electrical isolation type testing and analyses are documented in the "Analysis/Compliance of the IDS with Respect to the Specific Electrical Isolation Criteria in IEEE 384-1981" report(Reference 6)and conclude that the battery chargers, regulating transformers, and isolation fuses prevent credible faults from propagating into the IDS.

References 4 through 6 are available for NRC inspection as part of the Unit 3 and Unit 4 ITAAC 2.6.03.04b Completion Package (Reference 7).

U.S. Nuclear Regulatory Commission ND-21-0054 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 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 Vogtle Unit 3 and Unit 4 ITAAC Completion Package for ITAAC 2.6.03.04b (Reference 7) and is available for NRC inspection.

ITAAC Completion Statement Based on the above information, SNC hereby notifies the NRC that ITAAC 2.6.03.04b was performed for VEGP Unit 3 and 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. IEEE 384-1981,"IEEE Standard Criteria for Independence of Class 1E Equipment"

2. IEEE Standard 141,"IEEE Recommended Practice for Electrical Power Distribution for Industrial Plants, 1993"

3. IEEE Standard 242,"IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems, 1986"

4. APP-IDS-EOC-010 Rev 1,"Coordination Study - Class 1E 208Y/120V AC System"

5. APP-IDS-EOC-011 Rev 4,"Class 1E (IDS)250V DC System - Coordination Study"

6. APP-IDS-EOC-020 Rev 4,"Analysis/Compliance of the IDS with Respect to the Specific Electrical Isolation Criteria in IEEE 384-1981"

7. 2.6.03.04b-U0-CP-Rev0, ITAAC Completion Package