ND-23-0198, ITAAC Closure Notification on Completion of ITAAC 2.6.02.02b (Index Number 594)

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ITAAC Closure Notification on Completion of ITAAC 2.6.02.02b (Index Number 594)
ML23076A102
Person / Time
Site: Vogtle Southern Nuclear icon.png
Issue date: 03/17/2023
From: Coleman J
Southern Nuclear Operating Co
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
ND-23-0198, ITAAC 2.6.02.02b
Download: ML23076A102 (1)


Text

Jamie M. Coleman 7825 River Road Regulatory Affairs Director Waynesboro, GA 30830 Vogtle 3 & 4 706-848-6926 tel March 17, 2023 Docket No.: 52-026 ND-23-0198 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 2.6.02.02b [Index Number 594]

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 2.6.02.02b

[Index Number 594]. This ITAAC confirms that EDS load group 1, 2, 3, and 4 batteries can supply the corresponding dc switchboard bus load for a period of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> without recharging.

The closure process for this ITAAC is based on guidance described in Nuclear Energy Institute (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) request 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 ITAAC 2.6.02.02b [Index Number 594]

JMC/KIK/sfr

U.S. Nuclear Regulatory Commission ND-23-0198 Enclosure 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-23-0198 Enclosure Page 1 of 4 Southern Nuclear Operating Company ND-23-0198 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 4 Completion of ITAAC 2.6.02.02b [Index Number 594]

U.S. Nuclear Regulatory Commission ND-23-0198 Enclosure Page 2 of 4 ITAAC Statement Design Commitment:

2.b) Each EDS load group 1, 2, 3, and 4 battery supplies the corresponding dc switchboard bus load for a period of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> without recharging.

Inspections, Tests, Analyses:

Testing of each as-built battery will be performed by applying a simulated or real load, or a combination of simulated or real loads. The test will be conducted on a battery that has been fully charged and has been connected to a battery charger maintained at 135 +/-1 V for a period of no less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to the test.

Acceptance Criteria:

The battery terminal voltage is greater than or equal to 105 V after a period of no less than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, with an equivalent load greater than 850 amps.

ITAAC Determination Basis Testing was performed in accordance with Unit 4 component test work orders documented in Reference 1 to verify that each Non-Class 1E direct current (dc) and Uninterruptible Power Supply System (EDS) load group 1, 2, 3, and 4 battery supplies the corresponding dc switchboard bus load for a period of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> without recharging.

A battery service test, as defined in Institute of Electrical and Electronics Engineers (IEEE)

Standard 450-1995, was performed using a load bank to apply a load on the battery that results in a discharge current greater than 850 amps. The component test is performed on each fully charged as-built EDS battery that has been connected to a charger maintained at 135 +/-1 V for a period of no less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to the test. The EDS battery is disconnected from the battery charger and a load bank is then connected to the output of the battery, adjusted to a discharge current greater than 850 amps. Discharge current and battery terminal voltage at the start of the test and upon completion of the 2-hour test from the component test package work orders are included in Reference 1. The EDS battery discharge current and terminal voltage measurements are summarized in Attachment A and demonstrate that each EDS battery meets the acceptance criteria.

The Unit 4 component test results confirm the battery terminal voltage is greater than or equal to 105 V after a period of no less than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> with an equivalent load greater than 850 amps.

Reference 1 is available for NRC inspection as part of the Unit 4 ITAAC 2.6.02.02b Completion Package (Reference 2).

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 found there were no relevant findings associated with this ITAAC. The review is documented in the ITAAC Completion Package (Reference 2) and is available for NRC review.

U.S. Nuclear Regulatory Commission ND-23-0198 Enclosure Page 3 of 4 ITAAC Completion Statement Based on the above information, SNC hereby notifies the NRC that ITAAC 2.6.02.02b 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-EDS-ITR-800594 4 Test Results of Non Class 1E DC and UPS System: ITAAC 2.6.02.02b [NRC Index Number 594]
2. 2.6.02.02b-U4-CP-Rev0, ITAAC Completion Package

U.S. Nuclear Regulatory Commission ND-23-0198 Enclosure Page 4 of 4 Attachment A System: Non-Class 1E dc and Uninterruptible Power Supply System Test Discharge Pre-test Test Discharge Current, Voltage &

Component Voltage Current, Voltage & Time at End Unit Name* Tag No.* & Time Time at Start (>2 Hours)

Load Group 1 EDS1-DB-1 134 V >1255 Amp / 120.4 V >850 Amp / 112.4 V 4

Battery >24 hrs 09:28:06 hrs 11:28:06 hrs Load Group 2 EDS2-DB-1 134 V >1255 Amp / 120.3 V >850 Amp / 112.8 V 4

Battery >24 hrs 14:16:35 hrs 16:16:35 hrs Load Group 3 EDS3-DB-1 134 V >973 Amp / 122.2 V >850 Amp / 112.9 V 4

Battery >24 hrs 15:17:47 hrs 17:17:47 hrs Load Group 4 EDS4-DB-1 134 V >973 Amp / 122.2 V >850 Amp / 112.5 V 4

Battery >24 hrs 06:57:43 hrs 08:57:43 hrs